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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)10.72.158.0/25
network10.72.158.0/25
broadcast10.72.158.127
first host10.72.158.1
last host10.72.158.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.72.158.0/25
address00001010.01001000.10011110.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001000.10011110.00000000
broadcast00001010.01001000.10011110.01111111
green = network part, grey = host part
hex0x0a489e00
decimal172531200
reverse dns0.158.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:9e00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.158.0/3110.72.158.0 – 10.72.158.110.72.158.1
210.72.158.2/3110.72.158.2 – 10.72.158.310.72.158.3
310.72.158.4/3110.72.158.4 – 10.72.158.510.72.158.5
410.72.158.6/3110.72.158.6 – 10.72.158.710.72.158.7
510.72.158.8/3110.72.158.8 – 10.72.158.910.72.158.9
610.72.158.10/3110.72.158.10 – 10.72.158.1110.72.158.11
710.72.158.12/3110.72.158.12 – 10.72.158.1310.72.158.13
810.72.158.14/3110.72.158.14 – 10.72.158.1510.72.158.15
910.72.158.16/3110.72.158.16 – 10.72.158.1710.72.158.17
1010.72.158.18/3110.72.158.18 – 10.72.158.1910.72.158.19
1110.72.158.20/3110.72.158.20 – 10.72.158.2110.72.158.21
1210.72.158.22/3110.72.158.22 – 10.72.158.2310.72.158.23
1310.72.158.24/3110.72.158.24 – 10.72.158.2510.72.158.25
1410.72.158.26/3110.72.158.26 – 10.72.158.2710.72.158.27
1510.72.158.28/3110.72.158.28 – 10.72.158.2910.72.158.29
1610.72.158.30/3110.72.158.30 – 10.72.158.3110.72.158.31
1710.72.158.32/3110.72.158.32 – 10.72.158.3310.72.158.33
1810.72.158.34/3110.72.158.34 – 10.72.158.3510.72.158.35
1910.72.158.36/3110.72.158.36 – 10.72.158.3710.72.158.37
2010.72.158.38/3110.72.158.38 – 10.72.158.3910.72.158.39
2110.72.158.40/3110.72.158.40 – 10.72.158.4110.72.158.41
2210.72.158.42/3110.72.158.42 – 10.72.158.4310.72.158.43
2310.72.158.44/3110.72.158.44 – 10.72.158.4510.72.158.45
2410.72.158.46/3110.72.158.46 – 10.72.158.4710.72.158.47
2510.72.158.48/3110.72.158.48 – 10.72.158.4910.72.158.49
2610.72.158.50/3110.72.158.50 – 10.72.158.5110.72.158.51
2710.72.158.52/3110.72.158.52 – 10.72.158.5310.72.158.53
2810.72.158.54/3110.72.158.54 – 10.72.158.5510.72.158.55
2910.72.158.56/3110.72.158.56 – 10.72.158.5710.72.158.57
3010.72.158.58/3110.72.158.58 – 10.72.158.5910.72.158.59
3110.72.158.60/3110.72.158.60 – 10.72.158.6110.72.158.61
3210.72.158.62/3110.72.158.62 – 10.72.158.6310.72.158.63
3310.72.158.64/3110.72.158.64 – 10.72.158.6510.72.158.65
3410.72.158.66/3110.72.158.66 – 10.72.158.6710.72.158.67
3510.72.158.68/3110.72.158.68 – 10.72.158.6910.72.158.69
3610.72.158.70/3110.72.158.70 – 10.72.158.7110.72.158.71
3710.72.158.72/3110.72.158.72 – 10.72.158.7310.72.158.73
3810.72.158.74/3110.72.158.74 – 10.72.158.7510.72.158.75
3910.72.158.76/3110.72.158.76 – 10.72.158.7710.72.158.77
4010.72.158.78/3110.72.158.78 – 10.72.158.7910.72.158.79
4110.72.158.80/3110.72.158.80 – 10.72.158.8110.72.158.81
4210.72.158.82/3110.72.158.82 – 10.72.158.8310.72.158.83
4310.72.158.84/3110.72.158.84 – 10.72.158.8510.72.158.85
4410.72.158.86/3110.72.158.86 – 10.72.158.8710.72.158.87
4510.72.158.88/3110.72.158.88 – 10.72.158.8910.72.158.89
4610.72.158.90/3110.72.158.90 – 10.72.158.9110.72.158.91
4710.72.158.92/3110.72.158.92 – 10.72.158.9310.72.158.93
4810.72.158.94/3110.72.158.94 – 10.72.158.9510.72.158.95
4910.72.158.96/3110.72.158.96 – 10.72.158.9710.72.158.97
5010.72.158.98/3110.72.158.98 – 10.72.158.9910.72.158.99
5110.72.158.100/3110.72.158.100 – 10.72.158.10110.72.158.101
5210.72.158.102/3110.72.158.102 – 10.72.158.10310.72.158.103
5310.72.158.104/3110.72.158.104 – 10.72.158.10510.72.158.105
5410.72.158.106/3110.72.158.106 – 10.72.158.10710.72.158.107
5510.72.158.108/3110.72.158.108 – 10.72.158.10910.72.158.109
5610.72.158.110/3110.72.158.110 – 10.72.158.11110.72.158.111
5710.72.158.112/3110.72.158.112 – 10.72.158.11310.72.158.113
5810.72.158.114/3110.72.158.114 – 10.72.158.11510.72.158.115
5910.72.158.116/3110.72.158.116 – 10.72.158.11710.72.158.117
6010.72.158.118/3110.72.158.118 – 10.72.158.11910.72.158.119
6110.72.158.120/3110.72.158.120 – 10.72.158.12110.72.158.121
6210.72.158.122/3110.72.158.122 – 10.72.158.12310.72.158.123
6310.72.158.124/3110.72.158.124 – 10.72.158.12510.72.158.125
6410.72.158.126/3110.72.158.126 – 10.72.158.12710.72.158.127
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 →