ip
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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)10.0.131.0/25
network10.0.131.0/25
broadcast10.0.131.127
first host10.0.131.1
last host10.0.131.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.131.0/25
address00001010.00000000.10000011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.10000011.00000000
broadcast00001010.00000000.10000011.01111111
green = network part, grey = host part
hex0x0a008300
decimal167805696
reverse dns0.131.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:8300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.131.0/3110.0.131.0 – 10.0.131.110.0.131.1
210.0.131.2/3110.0.131.2 – 10.0.131.310.0.131.3
310.0.131.4/3110.0.131.4 – 10.0.131.510.0.131.5
410.0.131.6/3110.0.131.6 – 10.0.131.710.0.131.7
510.0.131.8/3110.0.131.8 – 10.0.131.910.0.131.9
610.0.131.10/3110.0.131.10 – 10.0.131.1110.0.131.11
710.0.131.12/3110.0.131.12 – 10.0.131.1310.0.131.13
810.0.131.14/3110.0.131.14 – 10.0.131.1510.0.131.15
910.0.131.16/3110.0.131.16 – 10.0.131.1710.0.131.17
1010.0.131.18/3110.0.131.18 – 10.0.131.1910.0.131.19
1110.0.131.20/3110.0.131.20 – 10.0.131.2110.0.131.21
1210.0.131.22/3110.0.131.22 – 10.0.131.2310.0.131.23
1310.0.131.24/3110.0.131.24 – 10.0.131.2510.0.131.25
1410.0.131.26/3110.0.131.26 – 10.0.131.2710.0.131.27
1510.0.131.28/3110.0.131.28 – 10.0.131.2910.0.131.29
1610.0.131.30/3110.0.131.30 – 10.0.131.3110.0.131.31
1710.0.131.32/3110.0.131.32 – 10.0.131.3310.0.131.33
1810.0.131.34/3110.0.131.34 – 10.0.131.3510.0.131.35
1910.0.131.36/3110.0.131.36 – 10.0.131.3710.0.131.37
2010.0.131.38/3110.0.131.38 – 10.0.131.3910.0.131.39
2110.0.131.40/3110.0.131.40 – 10.0.131.4110.0.131.41
2210.0.131.42/3110.0.131.42 – 10.0.131.4310.0.131.43
2310.0.131.44/3110.0.131.44 – 10.0.131.4510.0.131.45
2410.0.131.46/3110.0.131.46 – 10.0.131.4710.0.131.47
2510.0.131.48/3110.0.131.48 – 10.0.131.4910.0.131.49
2610.0.131.50/3110.0.131.50 – 10.0.131.5110.0.131.51
2710.0.131.52/3110.0.131.52 – 10.0.131.5310.0.131.53
2810.0.131.54/3110.0.131.54 – 10.0.131.5510.0.131.55
2910.0.131.56/3110.0.131.56 – 10.0.131.5710.0.131.57
3010.0.131.58/3110.0.131.58 – 10.0.131.5910.0.131.59
3110.0.131.60/3110.0.131.60 – 10.0.131.6110.0.131.61
3210.0.131.62/3110.0.131.62 – 10.0.131.6310.0.131.63
3310.0.131.64/3110.0.131.64 – 10.0.131.6510.0.131.65
3410.0.131.66/3110.0.131.66 – 10.0.131.6710.0.131.67
3510.0.131.68/3110.0.131.68 – 10.0.131.6910.0.131.69
3610.0.131.70/3110.0.131.70 – 10.0.131.7110.0.131.71
3710.0.131.72/3110.0.131.72 – 10.0.131.7310.0.131.73
3810.0.131.74/3110.0.131.74 – 10.0.131.7510.0.131.75
3910.0.131.76/3110.0.131.76 – 10.0.131.7710.0.131.77
4010.0.131.78/3110.0.131.78 – 10.0.131.7910.0.131.79
4110.0.131.80/3110.0.131.80 – 10.0.131.8110.0.131.81
4210.0.131.82/3110.0.131.82 – 10.0.131.8310.0.131.83
4310.0.131.84/3110.0.131.84 – 10.0.131.8510.0.131.85
4410.0.131.86/3110.0.131.86 – 10.0.131.8710.0.131.87
4510.0.131.88/3110.0.131.88 – 10.0.131.8910.0.131.89
4610.0.131.90/3110.0.131.90 – 10.0.131.9110.0.131.91
4710.0.131.92/3110.0.131.92 – 10.0.131.9310.0.131.93
4810.0.131.94/3110.0.131.94 – 10.0.131.9510.0.131.95
4910.0.131.96/3110.0.131.96 – 10.0.131.9710.0.131.97
5010.0.131.98/3110.0.131.98 – 10.0.131.9910.0.131.99
5110.0.131.100/3110.0.131.100 – 10.0.131.10110.0.131.101
5210.0.131.102/3110.0.131.102 – 10.0.131.10310.0.131.103
5310.0.131.104/3110.0.131.104 – 10.0.131.10510.0.131.105
5410.0.131.106/3110.0.131.106 – 10.0.131.10710.0.131.107
5510.0.131.108/3110.0.131.108 – 10.0.131.10910.0.131.109
5610.0.131.110/3110.0.131.110 – 10.0.131.11110.0.131.111
5710.0.131.112/3110.0.131.112 – 10.0.131.11310.0.131.113
5810.0.131.114/3110.0.131.114 – 10.0.131.11510.0.131.115
5910.0.131.116/3110.0.131.116 – 10.0.131.11710.0.131.117
6010.0.131.118/3110.0.131.118 – 10.0.131.11910.0.131.119
6110.0.131.120/3110.0.131.120 – 10.0.131.12110.0.131.121
6210.0.131.122/3110.0.131.122 – 10.0.131.12310.0.131.123
6310.0.131.124/3110.0.131.124 – 10.0.131.12510.0.131.125
6410.0.131.126/3110.0.131.126 – 10.0.131.12710.0.131.127
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 →