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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)10.72.85.0/25
network10.72.85.0/25
broadcast10.72.85.127
first host10.72.85.1
last host10.72.85.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.72.85.0/25
address00001010.01001000.01010101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001000.01010101.00000000
broadcast00001010.01001000.01010101.01111111
green = network part, grey = host part
hex0x0a485500
decimal172512512
reverse dns0.85.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:5500

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.85.0/3110.72.85.0 – 10.72.85.110.72.85.1
210.72.85.2/3110.72.85.2 – 10.72.85.310.72.85.3
310.72.85.4/3110.72.85.4 – 10.72.85.510.72.85.5
410.72.85.6/3110.72.85.6 – 10.72.85.710.72.85.7
510.72.85.8/3110.72.85.8 – 10.72.85.910.72.85.9
610.72.85.10/3110.72.85.10 – 10.72.85.1110.72.85.11
710.72.85.12/3110.72.85.12 – 10.72.85.1310.72.85.13
810.72.85.14/3110.72.85.14 – 10.72.85.1510.72.85.15
910.72.85.16/3110.72.85.16 – 10.72.85.1710.72.85.17
1010.72.85.18/3110.72.85.18 – 10.72.85.1910.72.85.19
1110.72.85.20/3110.72.85.20 – 10.72.85.2110.72.85.21
1210.72.85.22/3110.72.85.22 – 10.72.85.2310.72.85.23
1310.72.85.24/3110.72.85.24 – 10.72.85.2510.72.85.25
1410.72.85.26/3110.72.85.26 – 10.72.85.2710.72.85.27
1510.72.85.28/3110.72.85.28 – 10.72.85.2910.72.85.29
1610.72.85.30/3110.72.85.30 – 10.72.85.3110.72.85.31
1710.72.85.32/3110.72.85.32 – 10.72.85.3310.72.85.33
1810.72.85.34/3110.72.85.34 – 10.72.85.3510.72.85.35
1910.72.85.36/3110.72.85.36 – 10.72.85.3710.72.85.37
2010.72.85.38/3110.72.85.38 – 10.72.85.3910.72.85.39
2110.72.85.40/3110.72.85.40 – 10.72.85.4110.72.85.41
2210.72.85.42/3110.72.85.42 – 10.72.85.4310.72.85.43
2310.72.85.44/3110.72.85.44 – 10.72.85.4510.72.85.45
2410.72.85.46/3110.72.85.46 – 10.72.85.4710.72.85.47
2510.72.85.48/3110.72.85.48 – 10.72.85.4910.72.85.49
2610.72.85.50/3110.72.85.50 – 10.72.85.5110.72.85.51
2710.72.85.52/3110.72.85.52 – 10.72.85.5310.72.85.53
2810.72.85.54/3110.72.85.54 – 10.72.85.5510.72.85.55
2910.72.85.56/3110.72.85.56 – 10.72.85.5710.72.85.57
3010.72.85.58/3110.72.85.58 – 10.72.85.5910.72.85.59
3110.72.85.60/3110.72.85.60 – 10.72.85.6110.72.85.61
3210.72.85.62/3110.72.85.62 – 10.72.85.6310.72.85.63
3310.72.85.64/3110.72.85.64 – 10.72.85.6510.72.85.65
3410.72.85.66/3110.72.85.66 – 10.72.85.6710.72.85.67
3510.72.85.68/3110.72.85.68 – 10.72.85.6910.72.85.69
3610.72.85.70/3110.72.85.70 – 10.72.85.7110.72.85.71
3710.72.85.72/3110.72.85.72 – 10.72.85.7310.72.85.73
3810.72.85.74/3110.72.85.74 – 10.72.85.7510.72.85.75
3910.72.85.76/3110.72.85.76 – 10.72.85.7710.72.85.77
4010.72.85.78/3110.72.85.78 – 10.72.85.7910.72.85.79
4110.72.85.80/3110.72.85.80 – 10.72.85.8110.72.85.81
4210.72.85.82/3110.72.85.82 – 10.72.85.8310.72.85.83
4310.72.85.84/3110.72.85.84 – 10.72.85.8510.72.85.85
4410.72.85.86/3110.72.85.86 – 10.72.85.8710.72.85.87
4510.72.85.88/3110.72.85.88 – 10.72.85.8910.72.85.89
4610.72.85.90/3110.72.85.90 – 10.72.85.9110.72.85.91
4710.72.85.92/3110.72.85.92 – 10.72.85.9310.72.85.93
4810.72.85.94/3110.72.85.94 – 10.72.85.9510.72.85.95
4910.72.85.96/3110.72.85.96 – 10.72.85.9710.72.85.97
5010.72.85.98/3110.72.85.98 – 10.72.85.9910.72.85.99
5110.72.85.100/3110.72.85.100 – 10.72.85.10110.72.85.101
5210.72.85.102/3110.72.85.102 – 10.72.85.10310.72.85.103
5310.72.85.104/3110.72.85.104 – 10.72.85.10510.72.85.105
5410.72.85.106/3110.72.85.106 – 10.72.85.10710.72.85.107
5510.72.85.108/3110.72.85.108 – 10.72.85.10910.72.85.109
5610.72.85.110/3110.72.85.110 – 10.72.85.11110.72.85.111
5710.72.85.112/3110.72.85.112 – 10.72.85.11310.72.85.113
5810.72.85.114/3110.72.85.114 – 10.72.85.11510.72.85.115
5910.72.85.116/3110.72.85.116 – 10.72.85.11710.72.85.117
6010.72.85.118/3110.72.85.118 – 10.72.85.11910.72.85.119
6110.72.85.120/3110.72.85.120 – 10.72.85.12110.72.85.121
6210.72.85.122/3110.72.85.122 – 10.72.85.12310.72.85.123
6310.72.85.124/3110.72.85.124 – 10.72.85.12510.72.85.125
6410.72.85.126/3110.72.85.126 – 10.72.85.12710.72.85.127
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 →