Subnet Mask Cheat Sheet

Addresses
/ Usable
Netmask
/304 / 2255.255.255.252
/298 / 6255.255.255.248
/2816 / 14255.255.255.240
/2732 / 30255.255.255.224
/2664 / 62255.255.255.192
/25128 / 126255.255.255.128
/24256 / 254255.255.255.0
/23512 / 510255.255.254.0
/221024 / 1022255.255.252.0
/212048 / 2046255.255.248.0
/204096 / 4094255.255.240.0
/198192 / 8190255.255.224.0
/1816384 / 16382255.255.192.0
/1732768 / 32766255.255.128.0
/1665536 / 65534255.255.0.0
/816777216 / 16777214255.0.0.0

/25 - 2 Subnets @ 126 Hosts

NetworkIP RangeBroadcast
.0.1-.126.127
.128.129-.254.255

/26 - 4 Subnets @ 62 Hosts

NetworkIP RangeBroadcast
.0.1-.62.63
.64.65-.126.127
.128.129-.190.191
.192.193-.254.255

/27 - 8 Subnets @ 30 Hosts

NetworkIP RangeBroadcast
.0.1-.30.31
.32.33-.62.63
.64.65-.94.95
.96.97-.126.127
.128.129-.158.159
.160.161-.190.191
.192.193-.222.223
.224.225-.254.255

/28 - 16 Subnets @ 14 Hosts

NetworkIP RangeBroadcast
.0.1-.14.15
.16.17-.30.31
.32.33-.46.47
.48.49-.62.63
.64.65-.78.79
.80.81-.94.95
.96.97-.110.111
.112.113-.126.127
.128.129-.142.143
.144.145-.158.159
.160.161-.174.175
.176.177-.190.191
.192.193-.206.207
.208.209-.222.223
.224.225-.238.239
.240.241-.254.255

/29 - 32 Subnets @ 6 Hosts

NetworkIP RangeBroadcast
.0.1-.6.7
.8.9-.14.15
.16.17-.22.23
.24.25-.30.31
.32.33-.38.39
.40.41-.46.47
.48.49-.54.55
.56.57-.62.63
.64.65-.70.71
.72.73-.78.79
.80.81-.86.87
.88.89-.94.95
.96.97-.102.103
.104.105-.110.111
.112.113-.118.119
.120.121-.126.127
.128.129-.134.135
.136.137-.142.143
.144.145-.150.151
.152.153-.158.159
.160.161-.166.167
.168.169-.174.175
.176.177-.182.183
.184.185-.190.191
.192.193-.198.199
.200.201-.206.207
.208.209-.214.215
.216.217-.222.223
.224.225-.230.231
.232.233-.238.239
.240.241-.246.247
.248.249-.254.255

/30 - 64 Subnets @ 2 Hosts

NetworkIP RangeBroadcast
.0.1-.2.3
.4.5-.6.7
.8.9-.10.11
.12.13-.14.15
.16.17-.18.19
.20.21-.22.23
.24.25-.26.27
.28.29-.30.31
.32.33-.34.35
.36.37-.38.39
.40.41-.42.43
.44.45-.46.47
.48.49-.50.51
.52.53-.54.55
.56.57-.58.59
.60.61-.62.63
.64.65-.66.67
.68.69-.70.71
.72.73-.74.75
.76.77-.78.79
.80.81-.82.83
.84.85-.86.87
.88.89-.90.91
.92.93-.94.95
.96.97-.98.99
.100.101-.102.103
.104.105-.106.107
.108.109-.110.111
.112.113-.114.115
.116.117-.118.119
.120.121-.122.123
.124.125-.126.127

 

NetworkIP RangeBroadcast
.128.129-.130.131
.132.133-.134.135
.136.137-.138.139
.140.141-.142.143
.144.145-.146.147
.148.149-.150.151
.152.153-.154.155
.156.157-.158.159
.160.161-.162.163
.164.165-.166.167
.168.169-.170.171
.172.173-.174.175
.176.177-.178.179
.180.181-.182.183
.184.185-.186.187
.188.189-.190.191
.192.193-.194.195
.196.197-.198.199
.200.201-.202.203
.204.205-.206.207
.208.209-.210.211
.212.213-.214.215
.216.217-.218.219
.220.221-.222.223
.224.225-.226.227
.228.229-.230.231
.232.233-.234.235
.236.237-.238.239
.240.241-.242.243
.244.245-.246.247
.248.249-.250.251
.252.253-.254.255

/8 - 16,777,214 Hosts

NetworkIP RangeBroadcast
x.0.0.0x.0.0.1-x.255.255.254x.255.255.255

/16 - 65,534 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.255.254.255.255

/17 - 32,766 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.127.254.127.255
.128.0.128.1-.255.254.255.255

/18 - 16,382 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.63.254.63.255
.64.0.64.1-.127.254.127.255
.128.0.128.1-.191.254.191.255
.192.0.192.1-.255.254.255.255

/19 - 8,190 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.31.254.31.255
.32.0.32.1-.63.254.63.255
.64.0.64.1-.95.254.95.255
.96.0.96.1-.127.254.127.255
.128.0.128.1-.159.254.159.255
.160.0.160.1-.191.254.191.255
.192.0.192.1-.223.254.223.255
.224.0.224.1-.255.254.255.255

/20 - 4,094 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.15.254.15.255
.16.0.16.1-.31.254.31.255
.32.0.32.1-.47.254.47.255
.48.0.48.1-.63.254.63.255
.64.0.64.1-.79.254.79.255
.80.0.80.1-.95.254.95.255
.96.0.96.1-.111.254.111.255
.112.0.112.1-.127.254.127.255
.128.0.128.1-.143.254.143.255
.144.0.144.1-.159.254.159.255
.160.0.160.1-.175.254.175.255
.176.0.176.1-.191.254.191.255
.192.0.192.1-.207.254.207.255
.208.0.208.1-.223.254.223.255
.224.0.224.1-.239.254.239.255
.240.0.240.1-.255.254.255.255

/21 - 2048 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.7.254.7.255
.8.0.8.1-.15.254.15.255
.16.0.16.1-.23.254.23.255
.24.0.24.1-.31.254.31.255
.32.0.32.1-.39.254.39.255
.40.0.40.1-.47.254.47.255
.48.0.48.1-.55.254.55.255
.56.0.56.1-.63.254.63.255
.64.0.64.1-.71.254.71.255
.72.0.72.1-.79.254.79.255
.80.0.80.1-.87.254.87.255
.88.0.88.1-.95.254.95.255
.96.0.96.1-.103.254.103.255
.104.0.104.1-.111.254.111.255
.112.0.112.1-.119.254.119.255
.120.0.120.1-.127.254.127.255
.128.0.128.1-.135.254.135.255
.136.0.136.1-.143.254.143.255
.144.0.144.1-.151.254.151.255
.152.0.152.1-.159.254.159.255
.160.0.160.1-.167.254.167.255
.168.0.168.1-.175.254.175.255
.176.0.176.1-.183.254.183.255
.184.0.184.1-.191.254.191.255
.192.0.192.1-.199.254.199.255
.200.0.200.1-.207.254.207.255
.208.0.208.1-.215.254.215.255
.216.0.216.1-.223.254.223.255
.224.0.224.1-.231.254.231.255
.232.0.232.1-.239.254.239.255
.240.0.240.1-.247.254.247.255
.248.0.248.1-.255.254.255.255

/22 - 1,022 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.3.254.3.255
.4.0.4.1-.7.254.7.255
.8.0.8.1-.11.254.11.255
.12.0.12.1-.15.254.15.255
.16.0.16.1-.19.254.19.255
.20.0.20.1-.23.254.23.255
.24.0.24.1-.27.254.27.255
.28.0.28.1-.31.254.31.255
.32.0.32.1-.35.254.35.255
.36.0.36.1-.39.254.39.255
.40.0.40.1-.43.254.43.255
.44.0.44.1-.47.254.47.255
.48.0.48.1-.51.254.51.255
.52.0.52.1-.55.254.55.255
.56.0.56.1-.59.254.59.255
.60.0.60.1-.63.254.63.255
.64.0.64.1-.67.254.67.255
.68.0.68.1-.71.254.71.255
.72.0.72.1-.75.254.75.255
.76.0.76.1-.79.254.79.255
.80.0.80.1-.83.254.83.255
.84.0.84.1-.87.254.87.255
.88.0.88.1-.91.254.91.255
.92.0.92.1-.95.254.95.255
.96.0.96.1-.99.254.99.255
.100.0.100.1-.103.254.103.255
.104.0.104.1-.107.254.107.255
.108.0.108.1-.111.254.111.255
.112.0.112.1-.115.254.115.255
.116.0.116.1-.119.254.119.255
.120.0.120.1-.123.254.123.255
.124.0.124.1-.127.254.127.255
.128.0.128.1-.131.254.131.255
.132.0.132.1-.135.254.135.255
.136.0.136.1-.139.254.139.255
.140.0.140.1-.143.254.143.255
.144.0.144.1-.147.254.147.255
.148.0.148.1-.151.254.151.255
.152.0.152.1-.155.254.155.255
.156.0.156.1-.159.254.159.255
.160.0.160.1-.163.254.163.255
.164.0.164.1-.167.254.167.255
.168.0.168.1-.171.254.171.255
.172.0.172.1-.175.254.175.255
.176.0.176.1-.179.254.179.255
.180.0.180.1-.183.254.183.255
.184.0.184.1-.187.254.187.255
.188.0.188.1-.191.254.191.255
.192.0.192.1-.195.254.195.255
.196.0.196.1-.199.254.199.255
.200.0.200.1-.203.254.203.255
.204.0.204.1-.207.254.207.255
.208.0.208.1-.211.254.211.255
.212.0.212.1-.215.254.215.255
.216.0.216.1-.219.254.219.255
.220.0.220.1-.223.254.223.255
.224.0.224.1-.227.254.227.255
.228.0.228.1-.231.254.231.255
.232.0.232.1-.235.254.235.255
.236.0.236.1-.239.254.239.255
.240.0.240.1-.243.254.243.255
.244.0.244.1-.247.254.247.255
.248.0.248.1-.251.254.251.255
.252.0.252.1-.255.254.255.255

/23 - 510 Hosts

NetworkIP RangeBroadcast
.0.0.0.1-.1.254.1.255
.2.0.2.1-.3.254.3.255
.4.0.4.1-.5.254.5.255
.6.0.6.1-.7.254.7.255
.8.0.8.1-.9.254.9.255
.10.0.10.1-.11.254.11.255
.12.0.12.1-.13.254.13.255
.14.0.14.1-.15.254.15.255
.16.0.16.1-.17.254.17.255
.18.0.18.1-.19.254.19.255
.20.0.20.1-.21.254.21.255
.22.0.22.1-.23.254.23.255
.24.0.24.1-.25.254.25.255
.26.0.28.1-.27.254.27.255
.28.0.28.1-.29.254.29.255
.30.0.30.1-.31.254.31.255
.32.0.32.1-.33.254.33.255
.34.0.34.1-.35.254.35.255
.36.0.36.1-.37.254.37.255
.38.0.38.1-.39.254.39.255
.40.0.40.1-.41.254.41.255
.42.0.42.1-.43.254.43.255
.44.0.44.1-.45.254.45.255
.46.0.46.1-.47.254.47.255
.48.0.48.1-.49.254.49.255
.50.0.50.1-.51.254.51.255
.52.0.52.1-.53.254.53.255
.54.0.54.1-.55.254.55.255
.56.0.56.1-.57.254.57.255
.58.0.58.1-.59.254.59.255
.60.0.60.1-.61.254.61.255
.62.0.62.1-.63.254.63.255
.64.0.64.1-.65.254.65.255
.66.0.66.1-.67.254.67.255
.68.0.68.1-.69.254.69.255
.70.0.70.1-.71.254.71.255
.72.0.72.1-.73.254.73.255
.74.0.74.1-.75.254.75.255
.76.0.76.1-.77.254.77.255
.78.0.78.1-.79.254.79.255
.80.0.80.1-.81.254.81.255
.82.0.82.1-.83.254.83.255
.84.0.84.1-.85.254.85.255
.86.0.86.1-.87.254.87.255
.88.0.88.1-.89.254.89.255
.90.0.90.1-.91.254.91.255
.92.0.92.1-.93.254.93.255
.94.0.94.1-.95.254.95.255
.96.0.96.1-.97.254.97.255
.98.0.98.1-.99.254.99.255
.100.0.100.1-.101.254.101.255
.102.0.102.1-.103.254.103.255
.104.0.104.1-.105.254.105.255
.106.0.106.1-.107.254.107.255
.108.0.108.1-.109.254.109.255
.110.0.110.1-.111.254.111.255
.112.0.112.1-.113.254.113.255
.114.0.114.1-.115.254.115.255
.116.0.116.1-.117.254.117.255
.118.0.118.1-.119.254.119.255
.120.0.120.1-.121.254.121.255
.122.0.122.1-.123.254.123.255
.124.0.124.1-.125.254.125.255
.126.0.126.1-.127.254.127.255

 

NetworkIP RangeBroadcast
.128.0.128.1-.129.254.129.255
.130.0.130.1-.131.254.131.255
.132.0.132.1-.133.254.133.255
.134.0.134.1-.135.254.135.255
.136.0.136.1-.137.254.137.255
.138.0.138.1-.139.254.139.255
.140.0.140.1-.141.254.141.255
.142.0.142.1-.143.254.143.255
.144.0.144.1-.145.254.145.255
.146.0.146.1-.147.254.147.255
.148.0.148.1-.149.254.149.255
.150.0.150.1-.151.254.151.255
.152.0.152.1-.153.254.153.255
.154.0.154.1-.155.254.155.255
.156.0.156.1-.157.254.157.255
.158.0.158.1-.159.254.159.255
.160.0.160.1-.161.254.161.255
.162.0.162.1-.163.254.163.255
.164.0.164.1-.165.254.165.255
.166.0.166.1-.167.254.167.255
.168.0.168.1-.169.254.169.255
.170.0.170.1-.171.254.171.255
.172.0.172.1-.173.254.173.255
.174.0.174.1-.175.254.175.255
.176.0.176.1-.177.254.177.255
.178.0.178.1-.179.254.179.255
.180.0.180.1-.181.254.181.255
.182.0.182.1-.183.254.183.255
.184.0.184.1-.185.254.185.255
.186.0.186.1-.187.254.187.255
.188.0.188.1-.189.254.189.255
.190.0.190.1-.191.254.191.255
.192.0.192.1-.193.254.193.255
.194.0.194.1-.195.254.195.255
.196.0.196.1-.197.254.197.255
.198.0.198.1-.199.254.199.255
.200.0.200.1-.201.254.201.255
.202.0.202.1-.203.254.203.255
.204.0.204.1-.205.254.205.255
.206.0.206.1-.207.254.207.255
.208.0.208.1-.209.254.209.255
.210.0.210.1-.211.254.211.255
.212.0.212.1-.213.254.213.255
.214.0.214.1-.215.254.215.255
.216.0.216.1-.217.254.217.255
.218.0.218.1-.219.254.219.255
.220.0.220.1-.221.254.221.255
.222.0.222.1-.223.254.223.255
.224.0.224.1-.225.254.225.255
.226.0.226.1-.227.254.227.255
.228.0.228.1-.229.254.229.255
.230.0.230.1-.231.254.231.255
.232.0.232.1-.233.254.233.255
.234.0.234.1-.235.254.235.255
.236.0.236.1-.237.254.237.255
.238.0.238.1-.239.254.239.255
.240.0.240.1-.241.254.241.255
.242.0.242.1-.243.254.243.255
.244.0.244.1-.245.254.245.255
.246.0.246.1-.247.254.247.255
.248.0.248.1-.249.254.249.255
.250.0.250.1-.251.254.251.255
.252.0.252.1-.253.254.253.255
.254.0.254.1-.255.254.255.255