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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)10.131.89.0/25
network10.131.89.0/25
broadcast10.131.89.127
first host10.131.89.1
last host10.131.89.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.131.89.0/25
address00001010.10000011.01011001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10000011.01011001.00000000
broadcast00001010.10000011.01011001.01111111
green = network part, grey = host part
hex0x0a835900
decimal176380160
reverse dns0.89.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:5900

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.131.89.0/3110.131.89.0 – 10.131.89.110.131.89.1
210.131.89.2/3110.131.89.2 – 10.131.89.310.131.89.3
310.131.89.4/3110.131.89.4 – 10.131.89.510.131.89.5
410.131.89.6/3110.131.89.6 – 10.131.89.710.131.89.7
510.131.89.8/3110.131.89.8 – 10.131.89.910.131.89.9
610.131.89.10/3110.131.89.10 – 10.131.89.1110.131.89.11
710.131.89.12/3110.131.89.12 – 10.131.89.1310.131.89.13
810.131.89.14/3110.131.89.14 – 10.131.89.1510.131.89.15
910.131.89.16/3110.131.89.16 – 10.131.89.1710.131.89.17
1010.131.89.18/3110.131.89.18 – 10.131.89.1910.131.89.19
1110.131.89.20/3110.131.89.20 – 10.131.89.2110.131.89.21
1210.131.89.22/3110.131.89.22 – 10.131.89.2310.131.89.23
1310.131.89.24/3110.131.89.24 – 10.131.89.2510.131.89.25
1410.131.89.26/3110.131.89.26 – 10.131.89.2710.131.89.27
1510.131.89.28/3110.131.89.28 – 10.131.89.2910.131.89.29
1610.131.89.30/3110.131.89.30 – 10.131.89.3110.131.89.31
1710.131.89.32/3110.131.89.32 – 10.131.89.3310.131.89.33
1810.131.89.34/3110.131.89.34 – 10.131.89.3510.131.89.35
1910.131.89.36/3110.131.89.36 – 10.131.89.3710.131.89.37
2010.131.89.38/3110.131.89.38 – 10.131.89.3910.131.89.39
2110.131.89.40/3110.131.89.40 – 10.131.89.4110.131.89.41
2210.131.89.42/3110.131.89.42 – 10.131.89.4310.131.89.43
2310.131.89.44/3110.131.89.44 – 10.131.89.4510.131.89.45
2410.131.89.46/3110.131.89.46 – 10.131.89.4710.131.89.47
2510.131.89.48/3110.131.89.48 – 10.131.89.4910.131.89.49
2610.131.89.50/3110.131.89.50 – 10.131.89.5110.131.89.51
2710.131.89.52/3110.131.89.52 – 10.131.89.5310.131.89.53
2810.131.89.54/3110.131.89.54 – 10.131.89.5510.131.89.55
2910.131.89.56/3110.131.89.56 – 10.131.89.5710.131.89.57
3010.131.89.58/3110.131.89.58 – 10.131.89.5910.131.89.59
3110.131.89.60/3110.131.89.60 – 10.131.89.6110.131.89.61
3210.131.89.62/3110.131.89.62 – 10.131.89.6310.131.89.63
3310.131.89.64/3110.131.89.64 – 10.131.89.6510.131.89.65
3410.131.89.66/3110.131.89.66 – 10.131.89.6710.131.89.67
3510.131.89.68/3110.131.89.68 – 10.131.89.6910.131.89.69
3610.131.89.70/3110.131.89.70 – 10.131.89.7110.131.89.71
3710.131.89.72/3110.131.89.72 – 10.131.89.7310.131.89.73
3810.131.89.74/3110.131.89.74 – 10.131.89.7510.131.89.75
3910.131.89.76/3110.131.89.76 – 10.131.89.7710.131.89.77
4010.131.89.78/3110.131.89.78 – 10.131.89.7910.131.89.79
4110.131.89.80/3110.131.89.80 – 10.131.89.8110.131.89.81
4210.131.89.82/3110.131.89.82 – 10.131.89.8310.131.89.83
4310.131.89.84/3110.131.89.84 – 10.131.89.8510.131.89.85
4410.131.89.86/3110.131.89.86 – 10.131.89.8710.131.89.87
4510.131.89.88/3110.131.89.88 – 10.131.89.8910.131.89.89
4610.131.89.90/3110.131.89.90 – 10.131.89.9110.131.89.91
4710.131.89.92/3110.131.89.92 – 10.131.89.9310.131.89.93
4810.131.89.94/3110.131.89.94 – 10.131.89.9510.131.89.95
4910.131.89.96/3110.131.89.96 – 10.131.89.9710.131.89.97
5010.131.89.98/3110.131.89.98 – 10.131.89.9910.131.89.99
5110.131.89.100/3110.131.89.100 – 10.131.89.10110.131.89.101
5210.131.89.102/3110.131.89.102 – 10.131.89.10310.131.89.103
5310.131.89.104/3110.131.89.104 – 10.131.89.10510.131.89.105
5410.131.89.106/3110.131.89.106 – 10.131.89.10710.131.89.107
5510.131.89.108/3110.131.89.108 – 10.131.89.10910.131.89.109
5610.131.89.110/3110.131.89.110 – 10.131.89.11110.131.89.111
5710.131.89.112/3110.131.89.112 – 10.131.89.11310.131.89.113
5810.131.89.114/3110.131.89.114 – 10.131.89.11510.131.89.115
5910.131.89.116/3110.131.89.116 – 10.131.89.11710.131.89.117
6010.131.89.118/3110.131.89.118 – 10.131.89.11910.131.89.119
6110.131.89.120/3110.131.89.120 – 10.131.89.12110.131.89.121
6210.131.89.122/3110.131.89.122 – 10.131.89.12310.131.89.123
6310.131.89.124/3110.131.89.124 – 10.131.89.12510.131.89.125
6410.131.89.126/3110.131.89.126 – 10.131.89.12710.131.89.127
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 →