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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)10.7.237.0/25
network10.7.237.0/25
broadcast10.7.237.127
first host10.7.237.1
last host10.7.237.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.7.237.0/25
address00001010.00000111.11101101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000111.11101101.00000000
broadcast00001010.00000111.11101101.01111111
green = network part, grey = host part
hex0x0a07ed00
decimal168291584
reverse dns0.237.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:ed00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.7.237.0/3110.7.237.0 – 10.7.237.110.7.237.1
210.7.237.2/3110.7.237.2 – 10.7.237.310.7.237.3
310.7.237.4/3110.7.237.4 – 10.7.237.510.7.237.5
410.7.237.6/3110.7.237.6 – 10.7.237.710.7.237.7
510.7.237.8/3110.7.237.8 – 10.7.237.910.7.237.9
610.7.237.10/3110.7.237.10 – 10.7.237.1110.7.237.11
710.7.237.12/3110.7.237.12 – 10.7.237.1310.7.237.13
810.7.237.14/3110.7.237.14 – 10.7.237.1510.7.237.15
910.7.237.16/3110.7.237.16 – 10.7.237.1710.7.237.17
1010.7.237.18/3110.7.237.18 – 10.7.237.1910.7.237.19
1110.7.237.20/3110.7.237.20 – 10.7.237.2110.7.237.21
1210.7.237.22/3110.7.237.22 – 10.7.237.2310.7.237.23
1310.7.237.24/3110.7.237.24 – 10.7.237.2510.7.237.25
1410.7.237.26/3110.7.237.26 – 10.7.237.2710.7.237.27
1510.7.237.28/3110.7.237.28 – 10.7.237.2910.7.237.29
1610.7.237.30/3110.7.237.30 – 10.7.237.3110.7.237.31
1710.7.237.32/3110.7.237.32 – 10.7.237.3310.7.237.33
1810.7.237.34/3110.7.237.34 – 10.7.237.3510.7.237.35
1910.7.237.36/3110.7.237.36 – 10.7.237.3710.7.237.37
2010.7.237.38/3110.7.237.38 – 10.7.237.3910.7.237.39
2110.7.237.40/3110.7.237.40 – 10.7.237.4110.7.237.41
2210.7.237.42/3110.7.237.42 – 10.7.237.4310.7.237.43
2310.7.237.44/3110.7.237.44 – 10.7.237.4510.7.237.45
2410.7.237.46/3110.7.237.46 – 10.7.237.4710.7.237.47
2510.7.237.48/3110.7.237.48 – 10.7.237.4910.7.237.49
2610.7.237.50/3110.7.237.50 – 10.7.237.5110.7.237.51
2710.7.237.52/3110.7.237.52 – 10.7.237.5310.7.237.53
2810.7.237.54/3110.7.237.54 – 10.7.237.5510.7.237.55
2910.7.237.56/3110.7.237.56 – 10.7.237.5710.7.237.57
3010.7.237.58/3110.7.237.58 – 10.7.237.5910.7.237.59
3110.7.237.60/3110.7.237.60 – 10.7.237.6110.7.237.61
3210.7.237.62/3110.7.237.62 – 10.7.237.6310.7.237.63
3310.7.237.64/3110.7.237.64 – 10.7.237.6510.7.237.65
3410.7.237.66/3110.7.237.66 – 10.7.237.6710.7.237.67
3510.7.237.68/3110.7.237.68 – 10.7.237.6910.7.237.69
3610.7.237.70/3110.7.237.70 – 10.7.237.7110.7.237.71
3710.7.237.72/3110.7.237.72 – 10.7.237.7310.7.237.73
3810.7.237.74/3110.7.237.74 – 10.7.237.7510.7.237.75
3910.7.237.76/3110.7.237.76 – 10.7.237.7710.7.237.77
4010.7.237.78/3110.7.237.78 – 10.7.237.7910.7.237.79
4110.7.237.80/3110.7.237.80 – 10.7.237.8110.7.237.81
4210.7.237.82/3110.7.237.82 – 10.7.237.8310.7.237.83
4310.7.237.84/3110.7.237.84 – 10.7.237.8510.7.237.85
4410.7.237.86/3110.7.237.86 – 10.7.237.8710.7.237.87
4510.7.237.88/3110.7.237.88 – 10.7.237.8910.7.237.89
4610.7.237.90/3110.7.237.90 – 10.7.237.9110.7.237.91
4710.7.237.92/3110.7.237.92 – 10.7.237.9310.7.237.93
4810.7.237.94/3110.7.237.94 – 10.7.237.9510.7.237.95
4910.7.237.96/3110.7.237.96 – 10.7.237.9710.7.237.97
5010.7.237.98/3110.7.237.98 – 10.7.237.9910.7.237.99
5110.7.237.100/3110.7.237.100 – 10.7.237.10110.7.237.101
5210.7.237.102/3110.7.237.102 – 10.7.237.10310.7.237.103
5310.7.237.104/3110.7.237.104 – 10.7.237.10510.7.237.105
5410.7.237.106/3110.7.237.106 – 10.7.237.10710.7.237.107
5510.7.237.108/3110.7.237.108 – 10.7.237.10910.7.237.109
5610.7.237.110/3110.7.237.110 – 10.7.237.11110.7.237.111
5710.7.237.112/3110.7.237.112 – 10.7.237.11310.7.237.113
5810.7.237.114/3110.7.237.114 – 10.7.237.11510.7.237.115
5910.7.237.116/3110.7.237.116 – 10.7.237.11710.7.237.117
6010.7.237.118/3110.7.237.118 – 10.7.237.11910.7.237.119
6110.7.237.120/3110.7.237.120 – 10.7.237.12110.7.237.121
6210.7.237.122/3110.7.237.122 – 10.7.237.12310.7.237.123
6310.7.237.124/3110.7.237.124 – 10.7.237.12510.7.237.125
6410.7.237.126/3110.7.237.126 – 10.7.237.12710.7.237.127
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 →