255 lines
11 KiB
HTML
255 lines
11 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<HTML><HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="description" CONTENT="CIDR SUBNET MASK CHEATSHEET ICMP TYPE CODES again.net/cidr">
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<META NAME="keywords" CONTENT="CIDR SUBNET MASK CHEATSHEET ICMP TYPE CODES again.net/cidr">
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<META HTTP-EQUIV="Expires" CONTENT="0">
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<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-validate">
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<META NAME="ROBOTS" CONTENT="FOLLOW">
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<META NAME="ROBOTS" CONTENT="INDEX">
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<TITLE>CIDR SUBNET MASK CHEATSHEET & ICMP TYPE CODES</TITLE>
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</HEAD><BODY>
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<FONT FACE="courier"><pre>
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Netmask Netmask (binary) CIDR Notes
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_____________________________________________________________________________
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255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single addr)
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255.255.255.254 11111111.11111111.11111111.11111110 /31 Unuseable
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255.255.255.252 11111111.11111111.11111111.11111100 /30 2 useable
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255.255.255.248 11111111.11111111.11111111.11111000 /29 6 useable
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255.255.255.240 11111111.11111111.11111111.11110000 /28 14 useable
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255.255.255.224 11111111.11111111.11111111.11100000 /27 30 useable
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255.255.255.192 11111111.11111111.11111111.11000000 /26 62 useable
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255.255.255.128 11111111.11111111.11111111.10000000 /25 126 useable
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255.255.255.0 11111111.11111111.11111111.00000000 /24 "Class C" 254 useable
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255.255.254.0 11111111.11111111.11111110.00000000 /23 2 Class C's
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255.255.252.0 11111111.11111111.11111100.00000000 /22 4 Class C's
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255.255.248.0 11111111.11111111.11111000.00000000 /21 8 Class C's
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255.255.240.0 11111111.11111111.11110000.00000000 /20 16 Class C's
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255.255.224.0 11111111.11111111.11100000.00000000 /19 32 Class C's
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255.255.192.0 11111111.11111111.11000000.00000000 /18 64 Class C's
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255.255.128.0 11111111.11111111.10000000.00000000 /17 128 Class C's
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255.255.0.0 11111111.11111111.00000000.00000000 /16 "Class B"
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255.254.0.0 11111111.11111110.00000000.00000000 /15 2 Class B's
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255.252.0.0 11111111.11111100.00000000.00000000 /14 4 Class B's
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255.248.0.0 11111111.11111000.00000000.00000000 /13 8 Class B's
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255.240.0.0 11111111.11110000.00000000.00000000 /12 16 Class B's
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255.224.0.0 11111111.11100000.00000000.00000000 /11 32 Class B's
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255.192.0.0 11111111.11000000.00000000.00000000 /10 64 Class B's
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255.128.0.0 11111111.10000000.00000000.00000000 /9 128 Class B's
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255.0.0.0 11111111.00000000.00000000.00000000 /8 "Class A"
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254.0.0.0 11111110.00000000.00000000.00000000 /7
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252.0.0.0 11111100.00000000.00000000.00000000 /6
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248.0.0.0 11111000.00000000.00000000.00000000 /5
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240.0.0.0 11110000.00000000.00000000.00000000 /4
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224.0.0.0 11100000.00000000.00000000.00000000 /3
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192.0.0.0 11000000.00000000.00000000.00000000 /2
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128.0.0.0 10000000.00000000.00000000.00000000 /1
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0.0.0.0 00000000.00000000.00000000.00000000 /0 IP space
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Net Host Total
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Net Addr Addr Addr Number
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Class Range NetMask Bits Bits of hosts
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----------------------------------------------------------
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A 0-127 255.0.0.0 8 24 16777216 (i.e. 114.0.0.0)
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B 128-191 255.255.0.0 16 16 65536 (i.e. 150.0.0.0)
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C 192-254 255.255.255.0 24 8 256 (i.e. 199.0.0.0)
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D 224-239 (multicast)
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E 240-255 (reserved)
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F 208-215 255.255.255.240 28 4 16
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G 216/8 ARIN - North America
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G 217/8 RIPE NCC - Europe
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G 218-219/8 APNIC
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H 220-221 255.255.255.248 29 3 8 (reserved)
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K 222-223 255.255.255.254 31 1 2 (reserved)
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(ref: RFC1375 & http://www.iana.org/assignments/ipv4-address-space )
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( http://www.iana.org/numbers.htm )
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----------------------------------------------------------
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The current list of special use prefixes:
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0.0.0.0/8
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127.0.0.0/8
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192.0.2.0/24
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10.0.0.0/8
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172.16.0.0/12
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192.168.0.0/16
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169.254.0.0/16
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all D/E space
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(ref: RFC1918 http://www.rfc-editor.org/rfc/rfc1918.txt )
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( or ftp://ftp.isi.edu/in-notes/rfc1918.txt )
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(rfc search: http://www.rfc-editor.org/rfcsearch.html )
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( http://www.ietf.org/ietf/1id-abstracts.txt )
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( http://www.ietf.org/shadow.html )
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Martians: (updates at: www.iana.org/assignments/ipv4-address-space )
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no ip source-route
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access-list 100 deny ip host 0.0.0.0 any
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deny ip 0.0.0.0 0.255.255.255 any log ! antispoof
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deny ip 0.0.0.0 0.255.255.255 0.0.0.0 255.255.255.255 ! antispoof
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deny ip any 255.255.255.128 0.0.0.127 ! antispoof
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deny ip host 0.0.0.0 any log ! antispoof
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deny ip host [router intf] [router intf] ! antispoof
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deny ip xxx.xxx.xxx.0 0.0.0.255 any log ! lan area
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deny ip 0/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 1/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 2/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 5/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 7/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 10.0.0.0 0.255.255.255 any log ! IANA - Private Use
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deny ip 23/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 27/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 31/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 36-37/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 39/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 41-42/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 50/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 58-60/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 69-79/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 82-95/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 96-126/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 127/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 169.254.0.0 0.0.255.255 any log ! link-local network
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deny ip 172.16.0.0 0.15.255.255 any log ! reserved
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deny ip 192.168.0.0 0.0.255.255 any log ! reserved
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deny ip 192.0.2.0 0.0.0.255 any log ! test network
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deny ip 197/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 220/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 222-223/8 0.255.255.255 any log ! IANA - Reserved
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deny ip 224.0.0.0 31.255.255.255 any log ! multicast
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deny ip 224.0.0.0 15.255.255.255 any log ! unless MBGP-learned routes
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deny ip 224-239/8 0.255.255.255 any log ! IANA - Multicast
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deny ip 240-255/8 0.255.255.255 any log ! IANA - Reserved
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filtered source addresses
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0/8 ! broadcast
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10/8 ! RFC 1918 private
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127/8 ! loopback
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169.254.0/16 ! link local
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172.16.0.0/12 ! RFC 1918 private
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192.0.2.0/24 ! TEST-NET
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192.168.0/16 ! RFC 1918 private
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224.0.0.0/4 ! class D multicast
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240.0.0.0/5 ! class E reserved
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248.0.0.0/5 ! reserved
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255.255.255.255/32 ! broadcast
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ARIN administrated blocks: (http://www.arin.net/regserv/IPStats.html)
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24.0.0.0/8 (portions of)
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63.0.0.0/8
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64.0.0.0/8
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65.0.0.0/8
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66.0.0.0/8
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196.0.0.0/8
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198.0.0.0/8
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199.0.0.0/8
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200.0.0.0/8
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204.0.0.0/8
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205.0.0.0/8
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206.0.0.0/8
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207.0.0.0/8
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208.0.0.0/8
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209.0.0.0/8
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216.0.0.0/8
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----------------------------------------------------------
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well known ports: (rfc1700.txt)
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www.iana.org/assignments/port-numbers
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protocol numbers:
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www.iana.org/assignments/protocol-numbers
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www.iana.org/numbers.htm
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ICMP(Types/Codes)
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Testing Destination Reachability & Status
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(0/0) Echo-Reply
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(8/0) Echo
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Unreachable Destinations
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(3/0) Network Unreachable
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(3/1) Host Unreachable
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(3/2) Protocol Unreachable
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(3/3) Port Unreachable
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(3/4) Fragmentaion Needed and DF set (Pkt too big)
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(3/5) Source Route Failed
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(3/6) Network Unknown
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(3/7) Host Unknown
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(3/9) DOD Net Prohibited
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(3/10) DOD Host Prohibited
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(3/11) Net TOS Unreachable
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(3/12) Host TOS Unreachable
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(3/13) Administratively Prohibited
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(3/14) Host Precedence Unreachable
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(3/15) Precedence Unreachable
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Flow Control
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(4/0) Source-Quench [RFC 1016]
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Route Change Requests from Gateways
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(5/0) Redirect Datagrams for the Net
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(5/1) Redirect Datagrams for the Host
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(5/2) Redirect Datagrams for the TOS and Net
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(5/3) Redirect Datagrams for the TOS and Host
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Router
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(6/-) Alternate-Address
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(9/0) Router-Advertisement
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(10/0) Router-Solicitation
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Detecting Circular or Excessively Long Routes
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(11/0) Time to Live Count Exceeded
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(11/1) Fragment Reassembly Time Exceeded
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Reporting Incorrect Datagram Headers
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(12/0) Parameter-Problem
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(12/1) Option Missing
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(12/2) No Room for Option
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Clock Synchronization and Transit Time Estimation
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(13/0) Timestamp-Request
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(14/0) Timestamp-Reply
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Obtaining a Network Address (RARP Alternative)
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(15/0) Information-Request
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(16/0) Information-Reply
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Obtaining a Subnet Mask [RFC 950]
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(17/0) Address Mask-Request
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(18/0) Address Mask-Reply
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Other
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(30/0) Traceroute
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(31/0) Conversion-Error
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(32/0) Mobile-Redirect
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Ref: [RFC 792] [RFC 896] [RFC 950] [RFC 1016]
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www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_3/cofigide/qos.htm#19774
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Decimal system Prefix's
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Factor Exponent Prefix
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---------------------------------------------------
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1 000 000 000 000 000 000 000 000...10^24....yotta
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1 000 000 000 000 000 000 000...10^21....zetta
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1 000 000 000 000 000 000...10^18....exa
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1 000 000 000 000 000...10^15....peta
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1 000 000 000 000...10^12....tera
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1 000 000 000...10^9.....giga
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1 000 000...10^6.....mega
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1 000...10^3.....kilo
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100...10^2.....hecto
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10...10^1.....deka
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0.1...10^-1....deci
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0.01...10^-2....centi
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0.001...10^-3....milli
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0.000 001...10^-6....micro
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0.000 000 001...10^-9....nano
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0.000 000 000 001...10^-12...pico
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0.000 000 000 000 001...10^-15...femto
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0.000 000 000 000 000 001...10^-18...atto
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0.000 000 000 000 000 000 001...10^-21...zepto
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0.000 000 000 000 000 000 000 001...10^-24...yocto
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---------------------------------------------------
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Convert Fahrenheit <> Celsius:
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Celsius = (Fahrenheit - 32) / 1.8
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Fahrenheit = (Celsius * 1.8) + 32
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last updated: 4jul02
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</pre><BR><IMG SRC="http://again.net/null.gif?www.again.net/cidr"></body></html>
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