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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)10.167.235.0/25
network10.167.235.0/25
broadcast10.167.235.127
first host10.167.235.1
last host10.167.235.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.235.0/25
address00001010.10100111.11101011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11101011.00000000
broadcast00001010.10100111.11101011.01111111
green = network part, grey = host part
hex0x0aa7eb00
decimal178776832
reverse dns0.235.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:eb00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.235.0/3110.167.235.0 – 10.167.235.110.167.235.1
210.167.235.2/3110.167.235.2 – 10.167.235.310.167.235.3
310.167.235.4/3110.167.235.4 – 10.167.235.510.167.235.5
410.167.235.6/3110.167.235.6 – 10.167.235.710.167.235.7
510.167.235.8/3110.167.235.8 – 10.167.235.910.167.235.9
610.167.235.10/3110.167.235.10 – 10.167.235.1110.167.235.11
710.167.235.12/3110.167.235.12 – 10.167.235.1310.167.235.13
810.167.235.14/3110.167.235.14 – 10.167.235.1510.167.235.15
910.167.235.16/3110.167.235.16 – 10.167.235.1710.167.235.17
1010.167.235.18/3110.167.235.18 – 10.167.235.1910.167.235.19
1110.167.235.20/3110.167.235.20 – 10.167.235.2110.167.235.21
1210.167.235.22/3110.167.235.22 – 10.167.235.2310.167.235.23
1310.167.235.24/3110.167.235.24 – 10.167.235.2510.167.235.25
1410.167.235.26/3110.167.235.26 – 10.167.235.2710.167.235.27
1510.167.235.28/3110.167.235.28 – 10.167.235.2910.167.235.29
1610.167.235.30/3110.167.235.30 – 10.167.235.3110.167.235.31
1710.167.235.32/3110.167.235.32 – 10.167.235.3310.167.235.33
1810.167.235.34/3110.167.235.34 – 10.167.235.3510.167.235.35
1910.167.235.36/3110.167.235.36 – 10.167.235.3710.167.235.37
2010.167.235.38/3110.167.235.38 – 10.167.235.3910.167.235.39
2110.167.235.40/3110.167.235.40 – 10.167.235.4110.167.235.41
2210.167.235.42/3110.167.235.42 – 10.167.235.4310.167.235.43
2310.167.235.44/3110.167.235.44 – 10.167.235.4510.167.235.45
2410.167.235.46/3110.167.235.46 – 10.167.235.4710.167.235.47
2510.167.235.48/3110.167.235.48 – 10.167.235.4910.167.235.49
2610.167.235.50/3110.167.235.50 – 10.167.235.5110.167.235.51
2710.167.235.52/3110.167.235.52 – 10.167.235.5310.167.235.53
2810.167.235.54/3110.167.235.54 – 10.167.235.5510.167.235.55
2910.167.235.56/3110.167.235.56 – 10.167.235.5710.167.235.57
3010.167.235.58/3110.167.235.58 – 10.167.235.5910.167.235.59
3110.167.235.60/3110.167.235.60 – 10.167.235.6110.167.235.61
3210.167.235.62/3110.167.235.62 – 10.167.235.6310.167.235.63
3310.167.235.64/3110.167.235.64 – 10.167.235.6510.167.235.65
3410.167.235.66/3110.167.235.66 – 10.167.235.6710.167.235.67
3510.167.235.68/3110.167.235.68 – 10.167.235.6910.167.235.69
3610.167.235.70/3110.167.235.70 – 10.167.235.7110.167.235.71
3710.167.235.72/3110.167.235.72 – 10.167.235.7310.167.235.73
3810.167.235.74/3110.167.235.74 – 10.167.235.7510.167.235.75
3910.167.235.76/3110.167.235.76 – 10.167.235.7710.167.235.77
4010.167.235.78/3110.167.235.78 – 10.167.235.7910.167.235.79
4110.167.235.80/3110.167.235.80 – 10.167.235.8110.167.235.81
4210.167.235.82/3110.167.235.82 – 10.167.235.8310.167.235.83
4310.167.235.84/3110.167.235.84 – 10.167.235.8510.167.235.85
4410.167.235.86/3110.167.235.86 – 10.167.235.8710.167.235.87
4510.167.235.88/3110.167.235.88 – 10.167.235.8910.167.235.89
4610.167.235.90/3110.167.235.90 – 10.167.235.9110.167.235.91
4710.167.235.92/3110.167.235.92 – 10.167.235.9310.167.235.93
4810.167.235.94/3110.167.235.94 – 10.167.235.9510.167.235.95
4910.167.235.96/3110.167.235.96 – 10.167.235.9710.167.235.97
5010.167.235.98/3110.167.235.98 – 10.167.235.9910.167.235.99
5110.167.235.100/3110.167.235.100 – 10.167.235.10110.167.235.101
5210.167.235.102/3110.167.235.102 – 10.167.235.10310.167.235.103
5310.167.235.104/3110.167.235.104 – 10.167.235.10510.167.235.105
5410.167.235.106/3110.167.235.106 – 10.167.235.10710.167.235.107
5510.167.235.108/3110.167.235.108 – 10.167.235.10910.167.235.109
5610.167.235.110/3110.167.235.110 – 10.167.235.11110.167.235.111
5710.167.235.112/3110.167.235.112 – 10.167.235.11310.167.235.113
5810.167.235.114/3110.167.235.114 – 10.167.235.11510.167.235.115
5910.167.235.116/3110.167.235.116 – 10.167.235.11710.167.235.117
6010.167.235.118/3110.167.235.118 – 10.167.235.11910.167.235.119
6110.167.235.120/3110.167.235.120 – 10.167.235.12110.167.235.121
6210.167.235.122/3110.167.235.122 – 10.167.235.12310.167.235.123
6310.167.235.124/3110.167.235.124 – 10.167.235.12510.167.235.125
6410.167.235.126/3110.167.235.126 – 10.167.235.12710.167.235.127
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 →