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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)10.2.244.0/25
network10.2.244.0/25
broadcast10.2.244.127
first host10.2.244.1
last host10.2.244.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.244.0/25
address00001010.00000010.11110100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.11110100.00000000
broadcast00001010.00000010.11110100.01111111
green = network part, grey = host part
hex0x0a02f400
decimal167965696
reverse dns0.244.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:f400

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.244.0/3110.2.244.0 – 10.2.244.110.2.244.1
210.2.244.2/3110.2.244.2 – 10.2.244.310.2.244.3
310.2.244.4/3110.2.244.4 – 10.2.244.510.2.244.5
410.2.244.6/3110.2.244.6 – 10.2.244.710.2.244.7
510.2.244.8/3110.2.244.8 – 10.2.244.910.2.244.9
610.2.244.10/3110.2.244.10 – 10.2.244.1110.2.244.11
710.2.244.12/3110.2.244.12 – 10.2.244.1310.2.244.13
810.2.244.14/3110.2.244.14 – 10.2.244.1510.2.244.15
910.2.244.16/3110.2.244.16 – 10.2.244.1710.2.244.17
1010.2.244.18/3110.2.244.18 – 10.2.244.1910.2.244.19
1110.2.244.20/3110.2.244.20 – 10.2.244.2110.2.244.21
1210.2.244.22/3110.2.244.22 – 10.2.244.2310.2.244.23
1310.2.244.24/3110.2.244.24 – 10.2.244.2510.2.244.25
1410.2.244.26/3110.2.244.26 – 10.2.244.2710.2.244.27
1510.2.244.28/3110.2.244.28 – 10.2.244.2910.2.244.29
1610.2.244.30/3110.2.244.30 – 10.2.244.3110.2.244.31
1710.2.244.32/3110.2.244.32 – 10.2.244.3310.2.244.33
1810.2.244.34/3110.2.244.34 – 10.2.244.3510.2.244.35
1910.2.244.36/3110.2.244.36 – 10.2.244.3710.2.244.37
2010.2.244.38/3110.2.244.38 – 10.2.244.3910.2.244.39
2110.2.244.40/3110.2.244.40 – 10.2.244.4110.2.244.41
2210.2.244.42/3110.2.244.42 – 10.2.244.4310.2.244.43
2310.2.244.44/3110.2.244.44 – 10.2.244.4510.2.244.45
2410.2.244.46/3110.2.244.46 – 10.2.244.4710.2.244.47
2510.2.244.48/3110.2.244.48 – 10.2.244.4910.2.244.49
2610.2.244.50/3110.2.244.50 – 10.2.244.5110.2.244.51
2710.2.244.52/3110.2.244.52 – 10.2.244.5310.2.244.53
2810.2.244.54/3110.2.244.54 – 10.2.244.5510.2.244.55
2910.2.244.56/3110.2.244.56 – 10.2.244.5710.2.244.57
3010.2.244.58/3110.2.244.58 – 10.2.244.5910.2.244.59
3110.2.244.60/3110.2.244.60 – 10.2.244.6110.2.244.61
3210.2.244.62/3110.2.244.62 – 10.2.244.6310.2.244.63
3310.2.244.64/3110.2.244.64 – 10.2.244.6510.2.244.65
3410.2.244.66/3110.2.244.66 – 10.2.244.6710.2.244.67
3510.2.244.68/3110.2.244.68 – 10.2.244.6910.2.244.69
3610.2.244.70/3110.2.244.70 – 10.2.244.7110.2.244.71
3710.2.244.72/3110.2.244.72 – 10.2.244.7310.2.244.73
3810.2.244.74/3110.2.244.74 – 10.2.244.7510.2.244.75
3910.2.244.76/3110.2.244.76 – 10.2.244.7710.2.244.77
4010.2.244.78/3110.2.244.78 – 10.2.244.7910.2.244.79
4110.2.244.80/3110.2.244.80 – 10.2.244.8110.2.244.81
4210.2.244.82/3110.2.244.82 – 10.2.244.8310.2.244.83
4310.2.244.84/3110.2.244.84 – 10.2.244.8510.2.244.85
4410.2.244.86/3110.2.244.86 – 10.2.244.8710.2.244.87
4510.2.244.88/3110.2.244.88 – 10.2.244.8910.2.244.89
4610.2.244.90/3110.2.244.90 – 10.2.244.9110.2.244.91
4710.2.244.92/3110.2.244.92 – 10.2.244.9310.2.244.93
4810.2.244.94/3110.2.244.94 – 10.2.244.9510.2.244.95
4910.2.244.96/3110.2.244.96 – 10.2.244.9710.2.244.97
5010.2.244.98/3110.2.244.98 – 10.2.244.9910.2.244.99
5110.2.244.100/3110.2.244.100 – 10.2.244.10110.2.244.101
5210.2.244.102/3110.2.244.102 – 10.2.244.10310.2.244.103
5310.2.244.104/3110.2.244.104 – 10.2.244.10510.2.244.105
5410.2.244.106/3110.2.244.106 – 10.2.244.10710.2.244.107
5510.2.244.108/3110.2.244.108 – 10.2.244.10910.2.244.109
5610.2.244.110/3110.2.244.110 – 10.2.244.11110.2.244.111
5710.2.244.112/3110.2.244.112 – 10.2.244.11310.2.244.113
5810.2.244.114/3110.2.244.114 – 10.2.244.11510.2.244.115
5910.2.244.116/3110.2.244.116 – 10.2.244.11710.2.244.117
6010.2.244.118/3110.2.244.118 – 10.2.244.11910.2.244.119
6110.2.244.120/3110.2.244.120 – 10.2.244.12110.2.244.121
6210.2.244.122/3110.2.244.122 – 10.2.244.12310.2.244.123
6310.2.244.124/3110.2.244.124 – 10.2.244.12510.2.244.125
6410.2.244.126/3110.2.244.126 – 10.2.244.12710.2.244.127
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 →