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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)10.20.2.0/25
network10.20.2.0/25
broadcast10.20.2.127
first host10.20.2.1
last host10.20.2.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.20.2.0/25
address00001010.00010100.00000010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00010100.00000010.00000000
broadcast00001010.00010100.00000010.01111111
green = network part, grey = host part
hex0x0a140200
decimal169083392
reverse dns0.2.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:200

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.20.2.0/3110.20.2.0 – 10.20.2.110.20.2.1
210.20.2.2/3110.20.2.2 – 10.20.2.310.20.2.3
310.20.2.4/3110.20.2.4 – 10.20.2.510.20.2.5
410.20.2.6/3110.20.2.6 – 10.20.2.710.20.2.7
510.20.2.8/3110.20.2.8 – 10.20.2.910.20.2.9
610.20.2.10/3110.20.2.10 – 10.20.2.1110.20.2.11
710.20.2.12/3110.20.2.12 – 10.20.2.1310.20.2.13
810.20.2.14/3110.20.2.14 – 10.20.2.1510.20.2.15
910.20.2.16/3110.20.2.16 – 10.20.2.1710.20.2.17
1010.20.2.18/3110.20.2.18 – 10.20.2.1910.20.2.19
1110.20.2.20/3110.20.2.20 – 10.20.2.2110.20.2.21
1210.20.2.22/3110.20.2.22 – 10.20.2.2310.20.2.23
1310.20.2.24/3110.20.2.24 – 10.20.2.2510.20.2.25
1410.20.2.26/3110.20.2.26 – 10.20.2.2710.20.2.27
1510.20.2.28/3110.20.2.28 – 10.20.2.2910.20.2.29
1610.20.2.30/3110.20.2.30 – 10.20.2.3110.20.2.31
1710.20.2.32/3110.20.2.32 – 10.20.2.3310.20.2.33
1810.20.2.34/3110.20.2.34 – 10.20.2.3510.20.2.35
1910.20.2.36/3110.20.2.36 – 10.20.2.3710.20.2.37
2010.20.2.38/3110.20.2.38 – 10.20.2.3910.20.2.39
2110.20.2.40/3110.20.2.40 – 10.20.2.4110.20.2.41
2210.20.2.42/3110.20.2.42 – 10.20.2.4310.20.2.43
2310.20.2.44/3110.20.2.44 – 10.20.2.4510.20.2.45
2410.20.2.46/3110.20.2.46 – 10.20.2.4710.20.2.47
2510.20.2.48/3110.20.2.48 – 10.20.2.4910.20.2.49
2610.20.2.50/3110.20.2.50 – 10.20.2.5110.20.2.51
2710.20.2.52/3110.20.2.52 – 10.20.2.5310.20.2.53
2810.20.2.54/3110.20.2.54 – 10.20.2.5510.20.2.55
2910.20.2.56/3110.20.2.56 – 10.20.2.5710.20.2.57
3010.20.2.58/3110.20.2.58 – 10.20.2.5910.20.2.59
3110.20.2.60/3110.20.2.60 – 10.20.2.6110.20.2.61
3210.20.2.62/3110.20.2.62 – 10.20.2.6310.20.2.63
3310.20.2.64/3110.20.2.64 – 10.20.2.6510.20.2.65
3410.20.2.66/3110.20.2.66 – 10.20.2.6710.20.2.67
3510.20.2.68/3110.20.2.68 – 10.20.2.6910.20.2.69
3610.20.2.70/3110.20.2.70 – 10.20.2.7110.20.2.71
3710.20.2.72/3110.20.2.72 – 10.20.2.7310.20.2.73
3810.20.2.74/3110.20.2.74 – 10.20.2.7510.20.2.75
3910.20.2.76/3110.20.2.76 – 10.20.2.7710.20.2.77
4010.20.2.78/3110.20.2.78 – 10.20.2.7910.20.2.79
4110.20.2.80/3110.20.2.80 – 10.20.2.8110.20.2.81
4210.20.2.82/3110.20.2.82 – 10.20.2.8310.20.2.83
4310.20.2.84/3110.20.2.84 – 10.20.2.8510.20.2.85
4410.20.2.86/3110.20.2.86 – 10.20.2.8710.20.2.87
4510.20.2.88/3110.20.2.88 – 10.20.2.8910.20.2.89
4610.20.2.90/3110.20.2.90 – 10.20.2.9110.20.2.91
4710.20.2.92/3110.20.2.92 – 10.20.2.9310.20.2.93
4810.20.2.94/3110.20.2.94 – 10.20.2.9510.20.2.95
4910.20.2.96/3110.20.2.96 – 10.20.2.9710.20.2.97
5010.20.2.98/3110.20.2.98 – 10.20.2.9910.20.2.99
5110.20.2.100/3110.20.2.100 – 10.20.2.10110.20.2.101
5210.20.2.102/3110.20.2.102 – 10.20.2.10310.20.2.103
5310.20.2.104/3110.20.2.104 – 10.20.2.10510.20.2.105
5410.20.2.106/3110.20.2.106 – 10.20.2.10710.20.2.107
5510.20.2.108/3110.20.2.108 – 10.20.2.10910.20.2.109
5610.20.2.110/3110.20.2.110 – 10.20.2.11110.20.2.111
5710.20.2.112/3110.20.2.112 – 10.20.2.11310.20.2.113
5810.20.2.114/3110.20.2.114 – 10.20.2.11510.20.2.115
5910.20.2.116/3110.20.2.116 – 10.20.2.11710.20.2.117
6010.20.2.118/3110.20.2.118 – 10.20.2.11910.20.2.119
6110.20.2.120/3110.20.2.120 – 10.20.2.12110.20.2.121
6210.20.2.122/3110.20.2.122 – 10.20.2.12310.20.2.123
6310.20.2.124/3110.20.2.124 – 10.20.2.12510.20.2.125
6410.20.2.126/3110.20.2.126 – 10.20.2.12710.20.2.127
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 →