Subnet Cheat Sheet

Slash Notation Cheat Cheet

CIDR HostsNetmaskAmount of a Class C
/321255.255.255.2551/256
/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

Class C Subnet Cheat Sheet / Bit Boundary View 1

/25 -- 2 Subnets -- 126 Hosts/Subnet
Network #IP RangeBroadcast
.0.1-.126.127
.128.129-.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
/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

Class C Subnet Cheat Sheet / Bit Boundary View 2

Literal Bit Ranges
Bit Literal Bit Ranges
1 Ranges of 0-127; or 128-255
2 Ranges of 0-63; 64-127; 128-191; or 192-255
3 Ranges of 0-31; 32-63; 64-95; 96-127; 128-159; 160-191; 192-223; 224-255
4 Ranges of 0-15; 16-31; 32-47; 48-63; 64-79; 80-95; 96-111; 112-127; 128-143; 144-159; 160-175; 176-191; 192-207; 208-223; 224-239; 240-255
5 Ranges of 0-7; 8-15; 16-23; 24-31; 32-39; 40-47; 48-55; 56-63; 64-71; 72-79; 80-87; 88-95; 96-103; 104-111; 112-119; 120-127; 128-135; 136-143; 144-151; 152-159; 160-167; 168-175; 176-183; 184-191; 192-199; 200-207; 208-215; 216-223; 224-231; 232-239; 240-247; 248-255
6 Ranges of 0-3; 4-7; 8-11; 12-15; 16-19; 20-23; 24-27; 28-31; 32-35; 36-39; 40-43; 44-47; 48-51; 52-55; 56-59; 60-63; 64-67; 68-71; 72-75; 76-79; 80-83; 84-87; 88-91; 92-95; 96-99; 100-103; 104-107; 108-111; 112-115; 116-119; 120-123; 124-127; 128-131; 132-135; 136-139; 140-143; 144-147; 148-151; 152-155; 156-159; 160-163; 164-167; 168-171; 172-175; 176-179; 180-183; 184-187; 188-191; 192-195; 196-199; 200-203; 204-207; 208-211; 212-215; 216-219; 220-223; 224-227; 228-231; 232-235; 236-239; 240-243; 244-247; 248-251; 252-255
7 Ranges of 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
8 Only an exact match is possible.