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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)10.167.163.0/25
network10.167.163.0/25
broadcast10.167.163.127
first host10.167.163.1
last host10.167.163.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.163.0/25
address00001010.10100111.10100011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.10100011.00000000
broadcast00001010.10100111.10100011.01111111
green = network part, grey = host part
hex0x0aa7a300
decimal178758400
reverse dns0.163.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:a300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.163.0/3110.167.163.0 – 10.167.163.110.167.163.1
210.167.163.2/3110.167.163.2 – 10.167.163.310.167.163.3
310.167.163.4/3110.167.163.4 – 10.167.163.510.167.163.5
410.167.163.6/3110.167.163.6 – 10.167.163.710.167.163.7
510.167.163.8/3110.167.163.8 – 10.167.163.910.167.163.9
610.167.163.10/3110.167.163.10 – 10.167.163.1110.167.163.11
710.167.163.12/3110.167.163.12 – 10.167.163.1310.167.163.13
810.167.163.14/3110.167.163.14 – 10.167.163.1510.167.163.15
910.167.163.16/3110.167.163.16 – 10.167.163.1710.167.163.17
1010.167.163.18/3110.167.163.18 – 10.167.163.1910.167.163.19
1110.167.163.20/3110.167.163.20 – 10.167.163.2110.167.163.21
1210.167.163.22/3110.167.163.22 – 10.167.163.2310.167.163.23
1310.167.163.24/3110.167.163.24 – 10.167.163.2510.167.163.25
1410.167.163.26/3110.167.163.26 – 10.167.163.2710.167.163.27
1510.167.163.28/3110.167.163.28 – 10.167.163.2910.167.163.29
1610.167.163.30/3110.167.163.30 – 10.167.163.3110.167.163.31
1710.167.163.32/3110.167.163.32 – 10.167.163.3310.167.163.33
1810.167.163.34/3110.167.163.34 – 10.167.163.3510.167.163.35
1910.167.163.36/3110.167.163.36 – 10.167.163.3710.167.163.37
2010.167.163.38/3110.167.163.38 – 10.167.163.3910.167.163.39
2110.167.163.40/3110.167.163.40 – 10.167.163.4110.167.163.41
2210.167.163.42/3110.167.163.42 – 10.167.163.4310.167.163.43
2310.167.163.44/3110.167.163.44 – 10.167.163.4510.167.163.45
2410.167.163.46/3110.167.163.46 – 10.167.163.4710.167.163.47
2510.167.163.48/3110.167.163.48 – 10.167.163.4910.167.163.49
2610.167.163.50/3110.167.163.50 – 10.167.163.5110.167.163.51
2710.167.163.52/3110.167.163.52 – 10.167.163.5310.167.163.53
2810.167.163.54/3110.167.163.54 – 10.167.163.5510.167.163.55
2910.167.163.56/3110.167.163.56 – 10.167.163.5710.167.163.57
3010.167.163.58/3110.167.163.58 – 10.167.163.5910.167.163.59
3110.167.163.60/3110.167.163.60 – 10.167.163.6110.167.163.61
3210.167.163.62/3110.167.163.62 – 10.167.163.6310.167.163.63
3310.167.163.64/3110.167.163.64 – 10.167.163.6510.167.163.65
3410.167.163.66/3110.167.163.66 – 10.167.163.6710.167.163.67
3510.167.163.68/3110.167.163.68 – 10.167.163.6910.167.163.69
3610.167.163.70/3110.167.163.70 – 10.167.163.7110.167.163.71
3710.167.163.72/3110.167.163.72 – 10.167.163.7310.167.163.73
3810.167.163.74/3110.167.163.74 – 10.167.163.7510.167.163.75
3910.167.163.76/3110.167.163.76 – 10.167.163.7710.167.163.77
4010.167.163.78/3110.167.163.78 – 10.167.163.7910.167.163.79
4110.167.163.80/3110.167.163.80 – 10.167.163.8110.167.163.81
4210.167.163.82/3110.167.163.82 – 10.167.163.8310.167.163.83
4310.167.163.84/3110.167.163.84 – 10.167.163.8510.167.163.85
4410.167.163.86/3110.167.163.86 – 10.167.163.8710.167.163.87
4510.167.163.88/3110.167.163.88 – 10.167.163.8910.167.163.89
4610.167.163.90/3110.167.163.90 – 10.167.163.9110.167.163.91
4710.167.163.92/3110.167.163.92 – 10.167.163.9310.167.163.93
4810.167.163.94/3110.167.163.94 – 10.167.163.9510.167.163.95
4910.167.163.96/3110.167.163.96 – 10.167.163.9710.167.163.97
5010.167.163.98/3110.167.163.98 – 10.167.163.9910.167.163.99
5110.167.163.100/3110.167.163.100 – 10.167.163.10110.167.163.101
5210.167.163.102/3110.167.163.102 – 10.167.163.10310.167.163.103
5310.167.163.104/3110.167.163.104 – 10.167.163.10510.167.163.105
5410.167.163.106/3110.167.163.106 – 10.167.163.10710.167.163.107
5510.167.163.108/3110.167.163.108 – 10.167.163.10910.167.163.109
5610.167.163.110/3110.167.163.110 – 10.167.163.11110.167.163.111
5710.167.163.112/3110.167.163.112 – 10.167.163.11310.167.163.113
5810.167.163.114/3110.167.163.114 – 10.167.163.11510.167.163.115
5910.167.163.116/3110.167.163.116 – 10.167.163.11710.167.163.117
6010.167.163.118/3110.167.163.118 – 10.167.163.11910.167.163.119
6110.167.163.120/3110.167.163.120 – 10.167.163.12110.167.163.121
6210.167.163.122/3110.167.163.122 – 10.167.163.12310.167.163.123
6310.167.163.124/3110.167.163.124 – 10.167.163.12510.167.163.125
6410.167.163.126/3110.167.163.126 – 10.167.163.12710.167.163.127
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 →