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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)10.12.167.0/25
network10.12.167.0/25
broadcast10.12.167.127
first host10.12.167.1
last host10.12.167.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.12.167.0/25
address00001010.00001100.10100111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00001100.10100111.00000000
broadcast00001010.00001100.10100111.01111111
green = network part, grey = host part
hex0x0a0ca700
decimal168601344
reverse dns0.167.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:a700

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.167.0/3110.12.167.0 – 10.12.167.110.12.167.1
210.12.167.2/3110.12.167.2 – 10.12.167.310.12.167.3
310.12.167.4/3110.12.167.4 – 10.12.167.510.12.167.5
410.12.167.6/3110.12.167.6 – 10.12.167.710.12.167.7
510.12.167.8/3110.12.167.8 – 10.12.167.910.12.167.9
610.12.167.10/3110.12.167.10 – 10.12.167.1110.12.167.11
710.12.167.12/3110.12.167.12 – 10.12.167.1310.12.167.13
810.12.167.14/3110.12.167.14 – 10.12.167.1510.12.167.15
910.12.167.16/3110.12.167.16 – 10.12.167.1710.12.167.17
1010.12.167.18/3110.12.167.18 – 10.12.167.1910.12.167.19
1110.12.167.20/3110.12.167.20 – 10.12.167.2110.12.167.21
1210.12.167.22/3110.12.167.22 – 10.12.167.2310.12.167.23
1310.12.167.24/3110.12.167.24 – 10.12.167.2510.12.167.25
1410.12.167.26/3110.12.167.26 – 10.12.167.2710.12.167.27
1510.12.167.28/3110.12.167.28 – 10.12.167.2910.12.167.29
1610.12.167.30/3110.12.167.30 – 10.12.167.3110.12.167.31
1710.12.167.32/3110.12.167.32 – 10.12.167.3310.12.167.33
1810.12.167.34/3110.12.167.34 – 10.12.167.3510.12.167.35
1910.12.167.36/3110.12.167.36 – 10.12.167.3710.12.167.37
2010.12.167.38/3110.12.167.38 – 10.12.167.3910.12.167.39
2110.12.167.40/3110.12.167.40 – 10.12.167.4110.12.167.41
2210.12.167.42/3110.12.167.42 – 10.12.167.4310.12.167.43
2310.12.167.44/3110.12.167.44 – 10.12.167.4510.12.167.45
2410.12.167.46/3110.12.167.46 – 10.12.167.4710.12.167.47
2510.12.167.48/3110.12.167.48 – 10.12.167.4910.12.167.49
2610.12.167.50/3110.12.167.50 – 10.12.167.5110.12.167.51
2710.12.167.52/3110.12.167.52 – 10.12.167.5310.12.167.53
2810.12.167.54/3110.12.167.54 – 10.12.167.5510.12.167.55
2910.12.167.56/3110.12.167.56 – 10.12.167.5710.12.167.57
3010.12.167.58/3110.12.167.58 – 10.12.167.5910.12.167.59
3110.12.167.60/3110.12.167.60 – 10.12.167.6110.12.167.61
3210.12.167.62/3110.12.167.62 – 10.12.167.6310.12.167.63
3310.12.167.64/3110.12.167.64 – 10.12.167.6510.12.167.65
3410.12.167.66/3110.12.167.66 – 10.12.167.6710.12.167.67
3510.12.167.68/3110.12.167.68 – 10.12.167.6910.12.167.69
3610.12.167.70/3110.12.167.70 – 10.12.167.7110.12.167.71
3710.12.167.72/3110.12.167.72 – 10.12.167.7310.12.167.73
3810.12.167.74/3110.12.167.74 – 10.12.167.7510.12.167.75
3910.12.167.76/3110.12.167.76 – 10.12.167.7710.12.167.77
4010.12.167.78/3110.12.167.78 – 10.12.167.7910.12.167.79
4110.12.167.80/3110.12.167.80 – 10.12.167.8110.12.167.81
4210.12.167.82/3110.12.167.82 – 10.12.167.8310.12.167.83
4310.12.167.84/3110.12.167.84 – 10.12.167.8510.12.167.85
4410.12.167.86/3110.12.167.86 – 10.12.167.8710.12.167.87
4510.12.167.88/3110.12.167.88 – 10.12.167.8910.12.167.89
4610.12.167.90/3110.12.167.90 – 10.12.167.9110.12.167.91
4710.12.167.92/3110.12.167.92 – 10.12.167.9310.12.167.93
4810.12.167.94/3110.12.167.94 – 10.12.167.9510.12.167.95
4910.12.167.96/3110.12.167.96 – 10.12.167.9710.12.167.97
5010.12.167.98/3110.12.167.98 – 10.12.167.9910.12.167.99
5110.12.167.100/3110.12.167.100 – 10.12.167.10110.12.167.101
5210.12.167.102/3110.12.167.102 – 10.12.167.10310.12.167.103
5310.12.167.104/3110.12.167.104 – 10.12.167.10510.12.167.105
5410.12.167.106/3110.12.167.106 – 10.12.167.10710.12.167.107
5510.12.167.108/3110.12.167.108 – 10.12.167.10910.12.167.109
5610.12.167.110/3110.12.167.110 – 10.12.167.11110.12.167.111
5710.12.167.112/3110.12.167.112 – 10.12.167.11310.12.167.113
5810.12.167.114/3110.12.167.114 – 10.12.167.11510.12.167.115
5910.12.167.116/3110.12.167.116 – 10.12.167.11710.12.167.117
6010.12.167.118/3110.12.167.118 – 10.12.167.11910.12.167.119
6110.12.167.120/3110.12.167.120 – 10.12.167.12110.12.167.121
6210.12.167.122/3110.12.167.122 – 10.12.167.12310.12.167.123
6310.12.167.124/3110.12.167.124 – 10.12.167.12510.12.167.125
6410.12.167.126/3110.12.167.126 – 10.12.167.12710.12.167.127
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →