SUBNET CHEAT SHEET FILE

SUBNET CHEAT SHEET FILE

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Today’s topic is SUBNET CHEAT SHEET FILE: This is a quick reference for IPv4 and IPv6 subnetting and subnet masks. This will save you some time if you don’t want to count or just forget them.

IPV4 SUBNET MASK CHEAT SHEET

AddressesNetmaskAmount of Class C
/312255.255.255.2541/128
/304255.255.255.2521/64
/298255.255.255.2481/32
/2816255.255.255.2401/16
/2732255.255.255.2241/8
/2664255.255.255.1921/4
/25128255.255.255.1281/2
/24256255.255.255.01
/23512255.255.254.02
/221024255.255.252.04
/212048255.255.248.08
/204096255.255.240.016
/198192255.255.224.032
/1816384255.255.192.064
/1732768255.255.128.0128
/1665536255.255.0.0256
/15131072255.254.0.0512
/14262144255.252.0.01024
/13524288255.248.0.02048
/121048576255.240.0.04096
/112097152255.224.0.08192
/104194304255.192.0.016384
/98388608255.128.0.032768
/816777216255.0.0.065536

GUIDE TO IPV4 SUBNETS

/25 — 2 Subnets — 126 Hosts/Subnet

Network #IP RangeBroadcast
.0.1-.126.127
.128.129-.254.255

 

 

 

 

/26 — 4 Subnets — 62 Hosts/Subnet

Network #IP RangeBroadcast
.0.1-.62.63
.64.65-.126.127
.128.129-.190.191
.192.193-.254.255

 

 

/27 — 8 Subnets — 30 Hosts/Subnet

Network #IP 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/Subnet

Network #IP 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/Subnet

Network #IP 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/Subnet

Network #IP 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
.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

IPv6 is a completely different animal as far as subnetting goes. Please note the yellow rows as each has a special common usage or note If there is nothing in the “amount of a /64” column it means it is too small or too large to justify the calculation. A lot is not the same with IPv6 compared to IPv4. Route aggregation and objective drive subnetting are something that every enterprise IPv6 deployment will use, or it will fail miserably.

SubnetAddressesAmount of a /64
/1281
/1272
/1264
/1258
/12416
/12332
/12264
/121128
/120256
/119512
/1181,024
/1172,048
/1164,096
/1158,192
/11416,384
/11332,768
/11265,536
/111131,072
/110262,144
/109524,288
/1081,048,576
/1072,097,152
/1064,194,304
/1058,388,608
/10416,777,216This is equivalent to an IPv4 Internet or IPv4 /8
/10333,554,432
/10267,108,864
/101134,217,728
/100268,435,456
/99536,870,912
/981,073,741,824
/972,147,483,648
/964,294,967,296
/958,589,934,592
/9417,179,869,184
/9334,359,738,368
/9268,719,476,736
/91137,438,953,472
/90274,877,906,944
/89549,755,813,888
/881,099,511,627,776
/872,199,023,255,5521/8,388,608
/864,398,046,511,1041/4,194,304
/858,796,093,022,2081/2,097,152
/8417,592,186,044,4161/1,048,576
/8335,184,372,088,8321/524,288
/8270,368,744,177,6641/262,144
/81140,737,488,355,3281/131,072
/80281,474,976,710,6561/65,536
/79562,949,953,421,3121/32,768
/781,125,899,906,842,6201/16,384
/772,251,799,813,685,2401/8,192
/764,503,599,627,370,4901/4,096
/759,007,199,254,740,9901/2,048
/7418,014,398,509,481,9001/1,024
/7336,028,797,018,963,9001/512
/7272,057,594,037,927,9001/256
/71144,115,188,075,855,0001/128
/70288,230,376,151,711,0001/64
/69576,460,752,303,423,0001/32
/681,152,921,504,606,840,0001/16
/672,305,843,009,213,690,0001/8
/664,611,686,018,427,380,0001/4
/659,223,372,036,854,770,0001/2
/6418,446,744,073,709,500,000This is the standard end user allocation
/6336,893,488,147,419,100,0002
/6273,786,976,294,838,200,0004
/61147,573,952,589,676,000,0008
/60295,147,905,179,352,000,00016
/59590,295,810,358,705,000,00032
/581,180,591,620,717,410,000,00064
/572,361,183,241,434,820,000,000128
/564,722,366,482,869,640,000,000256
/559,444,732,965,739,290,000,000512
/5418,889,465,931,478,500,000,0001,024
/5337,778,931,862,957,100,000,0002,048
/5275,557,863,725,914,300,000,0004,096
/51151,115,727,451,828,000,000,0008,192
/50302,231,454,903,657,000,000,00016,384
/49604,462,909,807,314,000,000,00032,768
/481,208,925,819,614,620,000,000,00065,536 This is the standard business allocation
/472,417,851,639,229,250,000,000,000131,072
/464,835,703,278,458,510,000,000,000262,144
/459,671,406,556,917,030,000,000,000524,288
/4419,342,813,113,834,000,000,000,0001,048,576
/4338,685,626,227,668,100,000,000,0002,097,152
/4277,371,252,455,336,200,000,000,0004,194,304
/41154,742,504,910,672,000,000,000,0008,388,608
/40309,485,009,821,345,000,000,000,00016,777,216
/39618,970,019,642,690,000,000,000,00033,554,432
/381,237,940,039,285,380,000,000,000,00067,108,864
/372,475,880,078,570,760,000,000,000,000134,217,728
/364,951,760,157,141,520,000,000,000,000268,435,456
/359,903,520,314,283,040,000,000,000,000536,870,912
/3419,807,040,628,566,000,000,000,000,0001,073,741,824
/3339,614,081,257,132,100,000,000,000,0002,147,483,648
/3279,228,162,514,264,300,000,000,000,0004,294,967,296 This is the standard ISP Allocation
/31158,456,325,028,528,000,000,000,000,0008,589,934,592
/30316,912,650,057,057,000,000,000,000,00017,179,869,184
/29633,825,300,114,114,000,000,000,000,00034,359,738,368
/281,267,650,600,228,220,000,000,000,000,00068,719,476,736
/272,535,301,200,456,450,000,000,000,000,000
/265,070,602,400,912,910,000,000,000,000,000
/2510,141,204,801,825,800,000,000,000,000,000
/2420,282,409,603,651,600,000,000,000,000,000
/2340,564,819,207,303,300,000,000,000,000,000
/2281,129,638,414,606,600,000,000,000,000,000
/21162,259,276,829,213,000,000,000,000,000,000
/20324,518,553,658,426,000,000,000,000,000,000
/19649,037,107,316,853,000,000,000,000,000,000
/181,298,074,214,633,700,000,000,000,000,000,000
/172,596,148,429,267,410,000,000,000,000,000,000
/165,192,296,858,534,820,000,000,000,000,000,000
/1510,384,593,717,069,600,000,000,000,000,000,000
/1420,769,187,434,139,300,000,000,000,000,000,000
/1341,538,374,868,278,600,000,000,000,000,000,000
/1283,076,749,736,557,200,000,000,000,000,000,000
/11166,153,499,473,114,000,000,000,000,000,000,000
/10332,306,998,946,228,000,000,000,000,000,000,000
/9664,613,997,892,457,000,000,000,000,000,000,000
/81,329,227,995,784,910,000,000,000,000,000,000,000

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