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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)10.72.83.0/25
network10.72.83.0/25
broadcast10.72.83.127
first host10.72.83.1
last host10.72.83.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.72.83.0/25
address00001010.01001000.01010011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001000.01010011.00000000
broadcast00001010.01001000.01010011.01111111
green = network part, grey = host part
hex0x0a485300
decimal172512000
reverse dns0.83.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:5300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.83.0/3110.72.83.0 – 10.72.83.110.72.83.1
210.72.83.2/3110.72.83.2 – 10.72.83.310.72.83.3
310.72.83.4/3110.72.83.4 – 10.72.83.510.72.83.5
410.72.83.6/3110.72.83.6 – 10.72.83.710.72.83.7
510.72.83.8/3110.72.83.8 – 10.72.83.910.72.83.9
610.72.83.10/3110.72.83.10 – 10.72.83.1110.72.83.11
710.72.83.12/3110.72.83.12 – 10.72.83.1310.72.83.13
810.72.83.14/3110.72.83.14 – 10.72.83.1510.72.83.15
910.72.83.16/3110.72.83.16 – 10.72.83.1710.72.83.17
1010.72.83.18/3110.72.83.18 – 10.72.83.1910.72.83.19
1110.72.83.20/3110.72.83.20 – 10.72.83.2110.72.83.21
1210.72.83.22/3110.72.83.22 – 10.72.83.2310.72.83.23
1310.72.83.24/3110.72.83.24 – 10.72.83.2510.72.83.25
1410.72.83.26/3110.72.83.26 – 10.72.83.2710.72.83.27
1510.72.83.28/3110.72.83.28 – 10.72.83.2910.72.83.29
1610.72.83.30/3110.72.83.30 – 10.72.83.3110.72.83.31
1710.72.83.32/3110.72.83.32 – 10.72.83.3310.72.83.33
1810.72.83.34/3110.72.83.34 – 10.72.83.3510.72.83.35
1910.72.83.36/3110.72.83.36 – 10.72.83.3710.72.83.37
2010.72.83.38/3110.72.83.38 – 10.72.83.3910.72.83.39
2110.72.83.40/3110.72.83.40 – 10.72.83.4110.72.83.41
2210.72.83.42/3110.72.83.42 – 10.72.83.4310.72.83.43
2310.72.83.44/3110.72.83.44 – 10.72.83.4510.72.83.45
2410.72.83.46/3110.72.83.46 – 10.72.83.4710.72.83.47
2510.72.83.48/3110.72.83.48 – 10.72.83.4910.72.83.49
2610.72.83.50/3110.72.83.50 – 10.72.83.5110.72.83.51
2710.72.83.52/3110.72.83.52 – 10.72.83.5310.72.83.53
2810.72.83.54/3110.72.83.54 – 10.72.83.5510.72.83.55
2910.72.83.56/3110.72.83.56 – 10.72.83.5710.72.83.57
3010.72.83.58/3110.72.83.58 – 10.72.83.5910.72.83.59
3110.72.83.60/3110.72.83.60 – 10.72.83.6110.72.83.61
3210.72.83.62/3110.72.83.62 – 10.72.83.6310.72.83.63
3310.72.83.64/3110.72.83.64 – 10.72.83.6510.72.83.65
3410.72.83.66/3110.72.83.66 – 10.72.83.6710.72.83.67
3510.72.83.68/3110.72.83.68 – 10.72.83.6910.72.83.69
3610.72.83.70/3110.72.83.70 – 10.72.83.7110.72.83.71
3710.72.83.72/3110.72.83.72 – 10.72.83.7310.72.83.73
3810.72.83.74/3110.72.83.74 – 10.72.83.7510.72.83.75
3910.72.83.76/3110.72.83.76 – 10.72.83.7710.72.83.77
4010.72.83.78/3110.72.83.78 – 10.72.83.7910.72.83.79
4110.72.83.80/3110.72.83.80 – 10.72.83.8110.72.83.81
4210.72.83.82/3110.72.83.82 – 10.72.83.8310.72.83.83
4310.72.83.84/3110.72.83.84 – 10.72.83.8510.72.83.85
4410.72.83.86/3110.72.83.86 – 10.72.83.8710.72.83.87
4510.72.83.88/3110.72.83.88 – 10.72.83.8910.72.83.89
4610.72.83.90/3110.72.83.90 – 10.72.83.9110.72.83.91
4710.72.83.92/3110.72.83.92 – 10.72.83.9310.72.83.93
4810.72.83.94/3110.72.83.94 – 10.72.83.9510.72.83.95
4910.72.83.96/3110.72.83.96 – 10.72.83.9710.72.83.97
5010.72.83.98/3110.72.83.98 – 10.72.83.9910.72.83.99
5110.72.83.100/3110.72.83.100 – 10.72.83.10110.72.83.101
5210.72.83.102/3110.72.83.102 – 10.72.83.10310.72.83.103
5310.72.83.104/3110.72.83.104 – 10.72.83.10510.72.83.105
5410.72.83.106/3110.72.83.106 – 10.72.83.10710.72.83.107
5510.72.83.108/3110.72.83.108 – 10.72.83.10910.72.83.109
5610.72.83.110/3110.72.83.110 – 10.72.83.11110.72.83.111
5710.72.83.112/3110.72.83.112 – 10.72.83.11310.72.83.113
5810.72.83.114/3110.72.83.114 – 10.72.83.11510.72.83.115
5910.72.83.116/3110.72.83.116 – 10.72.83.11710.72.83.117
6010.72.83.118/3110.72.83.118 – 10.72.83.11910.72.83.119
6110.72.83.120/3110.72.83.120 – 10.72.83.12110.72.83.121
6210.72.83.122/3110.72.83.122 – 10.72.83.12310.72.83.123
6310.72.83.124/3110.72.83.124 – 10.72.83.12510.72.83.125
6410.72.83.126/3110.72.83.126 – 10.72.83.12710.72.83.127
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 →