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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.166.37.64/26
network10.166.37.64/26
broadcast10.166.37.127
first host10.166.37.65
last host10.166.37.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.166.37.64/26
address00001010.10100110.00100101.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100110.00100101.01000000
broadcast00001010.10100110.00100101.01111111
green = network part, grey = host part
hex0x0aa62540
decimal178660672
reverse dns64.37.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:2540

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.37.64/3210.166.37.64 – 10.166.37.6410.166.37.64
210.166.37.65/3210.166.37.65 – 10.166.37.6510.166.37.65
310.166.37.66/3210.166.37.66 – 10.166.37.6610.166.37.66
410.166.37.67/3210.166.37.67 – 10.166.37.6710.166.37.67
510.166.37.68/3210.166.37.68 – 10.166.37.6810.166.37.68
610.166.37.69/3210.166.37.69 – 10.166.37.6910.166.37.69
710.166.37.70/3210.166.37.70 – 10.166.37.7010.166.37.70
810.166.37.71/3210.166.37.71 – 10.166.37.7110.166.37.71
910.166.37.72/3210.166.37.72 – 10.166.37.7210.166.37.72
1010.166.37.73/3210.166.37.73 – 10.166.37.7310.166.37.73
1110.166.37.74/3210.166.37.74 – 10.166.37.7410.166.37.74
1210.166.37.75/3210.166.37.75 – 10.166.37.7510.166.37.75
1310.166.37.76/3210.166.37.76 – 10.166.37.7610.166.37.76
1410.166.37.77/3210.166.37.77 – 10.166.37.7710.166.37.77
1510.166.37.78/3210.166.37.78 – 10.166.37.7810.166.37.78
1610.166.37.79/3210.166.37.79 – 10.166.37.7910.166.37.79
1710.166.37.80/3210.166.37.80 – 10.166.37.8010.166.37.80
1810.166.37.81/3210.166.37.81 – 10.166.37.8110.166.37.81
1910.166.37.82/3210.166.37.82 – 10.166.37.8210.166.37.82
2010.166.37.83/3210.166.37.83 – 10.166.37.8310.166.37.83
2110.166.37.84/3210.166.37.84 – 10.166.37.8410.166.37.84
2210.166.37.85/3210.166.37.85 – 10.166.37.8510.166.37.85
2310.166.37.86/3210.166.37.86 – 10.166.37.8610.166.37.86
2410.166.37.87/3210.166.37.87 – 10.166.37.8710.166.37.87
2510.166.37.88/3210.166.37.88 – 10.166.37.8810.166.37.88
2610.166.37.89/3210.166.37.89 – 10.166.37.8910.166.37.89
2710.166.37.90/3210.166.37.90 – 10.166.37.9010.166.37.90
2810.166.37.91/3210.166.37.91 – 10.166.37.9110.166.37.91
2910.166.37.92/3210.166.37.92 – 10.166.37.9210.166.37.92
3010.166.37.93/3210.166.37.93 – 10.166.37.9310.166.37.93
3110.166.37.94/3210.166.37.94 – 10.166.37.9410.166.37.94
3210.166.37.95/3210.166.37.95 – 10.166.37.9510.166.37.95
3310.166.37.96/3210.166.37.96 – 10.166.37.9610.166.37.96
3410.166.37.97/3210.166.37.97 – 10.166.37.9710.166.37.97
3510.166.37.98/3210.166.37.98 – 10.166.37.9810.166.37.98
3610.166.37.99/3210.166.37.99 – 10.166.37.9910.166.37.99
3710.166.37.100/3210.166.37.100 – 10.166.37.10010.166.37.100
3810.166.37.101/3210.166.37.101 – 10.166.37.10110.166.37.101
3910.166.37.102/3210.166.37.102 – 10.166.37.10210.166.37.102
4010.166.37.103/3210.166.37.103 – 10.166.37.10310.166.37.103
4110.166.37.104/3210.166.37.104 – 10.166.37.10410.166.37.104
4210.166.37.105/3210.166.37.105 – 10.166.37.10510.166.37.105
4310.166.37.106/3210.166.37.106 – 10.166.37.10610.166.37.106
4410.166.37.107/3210.166.37.107 – 10.166.37.10710.166.37.107
4510.166.37.108/3210.166.37.108 – 10.166.37.10810.166.37.108
4610.166.37.109/3210.166.37.109 – 10.166.37.10910.166.37.109
4710.166.37.110/3210.166.37.110 – 10.166.37.11010.166.37.110
4810.166.37.111/3210.166.37.111 – 10.166.37.11110.166.37.111
4910.166.37.112/3210.166.37.112 – 10.166.37.11210.166.37.112
5010.166.37.113/3210.166.37.113 – 10.166.37.11310.166.37.113
5110.166.37.114/3210.166.37.114 – 10.166.37.11410.166.37.114
5210.166.37.115/3210.166.37.115 – 10.166.37.11510.166.37.115
5310.166.37.116/3210.166.37.116 – 10.166.37.11610.166.37.116
5410.166.37.117/3210.166.37.117 – 10.166.37.11710.166.37.117
5510.166.37.118/3210.166.37.118 – 10.166.37.11810.166.37.118
5610.166.37.119/3210.166.37.119 – 10.166.37.11910.166.37.119
5710.166.37.120/3210.166.37.120 – 10.166.37.12010.166.37.120
5810.166.37.121/3210.166.37.121 – 10.166.37.12110.166.37.121
5910.166.37.122/3210.166.37.122 – 10.166.37.12210.166.37.122
6010.166.37.123/3210.166.37.123 – 10.166.37.12310.166.37.123
6110.166.37.124/3210.166.37.124 – 10.166.37.12410.166.37.124
6210.166.37.125/3210.166.37.125 – 10.166.37.12510.166.37.125
6310.166.37.126/3210.166.37.126 – 10.166.37.12610.166.37.126
6410.166.37.127/3210.166.37.127 – 10.166.37.12710.166.37.127
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →