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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)10.167.133.0/25
network10.167.133.0/25
broadcast10.167.133.127
first host10.167.133.1
last host10.167.133.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.133.0/25
address00001010.10100111.10000101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.10000101.00000000
broadcast00001010.10100111.10000101.01111111
green = network part, grey = host part
hex0x0aa78500
decimal178750720
reverse dns0.133.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:8500

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.133.0/3110.167.133.0 – 10.167.133.110.167.133.1
210.167.133.2/3110.167.133.2 – 10.167.133.310.167.133.3
310.167.133.4/3110.167.133.4 – 10.167.133.510.167.133.5
410.167.133.6/3110.167.133.6 – 10.167.133.710.167.133.7
510.167.133.8/3110.167.133.8 – 10.167.133.910.167.133.9
610.167.133.10/3110.167.133.10 – 10.167.133.1110.167.133.11
710.167.133.12/3110.167.133.12 – 10.167.133.1310.167.133.13
810.167.133.14/3110.167.133.14 – 10.167.133.1510.167.133.15
910.167.133.16/3110.167.133.16 – 10.167.133.1710.167.133.17
1010.167.133.18/3110.167.133.18 – 10.167.133.1910.167.133.19
1110.167.133.20/3110.167.133.20 – 10.167.133.2110.167.133.21
1210.167.133.22/3110.167.133.22 – 10.167.133.2310.167.133.23
1310.167.133.24/3110.167.133.24 – 10.167.133.2510.167.133.25
1410.167.133.26/3110.167.133.26 – 10.167.133.2710.167.133.27
1510.167.133.28/3110.167.133.28 – 10.167.133.2910.167.133.29
1610.167.133.30/3110.167.133.30 – 10.167.133.3110.167.133.31
1710.167.133.32/3110.167.133.32 – 10.167.133.3310.167.133.33
1810.167.133.34/3110.167.133.34 – 10.167.133.3510.167.133.35
1910.167.133.36/3110.167.133.36 – 10.167.133.3710.167.133.37
2010.167.133.38/3110.167.133.38 – 10.167.133.3910.167.133.39
2110.167.133.40/3110.167.133.40 – 10.167.133.4110.167.133.41
2210.167.133.42/3110.167.133.42 – 10.167.133.4310.167.133.43
2310.167.133.44/3110.167.133.44 – 10.167.133.4510.167.133.45
2410.167.133.46/3110.167.133.46 – 10.167.133.4710.167.133.47
2510.167.133.48/3110.167.133.48 – 10.167.133.4910.167.133.49
2610.167.133.50/3110.167.133.50 – 10.167.133.5110.167.133.51
2710.167.133.52/3110.167.133.52 – 10.167.133.5310.167.133.53
2810.167.133.54/3110.167.133.54 – 10.167.133.5510.167.133.55
2910.167.133.56/3110.167.133.56 – 10.167.133.5710.167.133.57
3010.167.133.58/3110.167.133.58 – 10.167.133.5910.167.133.59
3110.167.133.60/3110.167.133.60 – 10.167.133.6110.167.133.61
3210.167.133.62/3110.167.133.62 – 10.167.133.6310.167.133.63
3310.167.133.64/3110.167.133.64 – 10.167.133.6510.167.133.65
3410.167.133.66/3110.167.133.66 – 10.167.133.6710.167.133.67
3510.167.133.68/3110.167.133.68 – 10.167.133.6910.167.133.69
3610.167.133.70/3110.167.133.70 – 10.167.133.7110.167.133.71
3710.167.133.72/3110.167.133.72 – 10.167.133.7310.167.133.73
3810.167.133.74/3110.167.133.74 – 10.167.133.7510.167.133.75
3910.167.133.76/3110.167.133.76 – 10.167.133.7710.167.133.77
4010.167.133.78/3110.167.133.78 – 10.167.133.7910.167.133.79
4110.167.133.80/3110.167.133.80 – 10.167.133.8110.167.133.81
4210.167.133.82/3110.167.133.82 – 10.167.133.8310.167.133.83
4310.167.133.84/3110.167.133.84 – 10.167.133.8510.167.133.85
4410.167.133.86/3110.167.133.86 – 10.167.133.8710.167.133.87
4510.167.133.88/3110.167.133.88 – 10.167.133.8910.167.133.89
4610.167.133.90/3110.167.133.90 – 10.167.133.9110.167.133.91
4710.167.133.92/3110.167.133.92 – 10.167.133.9310.167.133.93
4810.167.133.94/3110.167.133.94 – 10.167.133.9510.167.133.95
4910.167.133.96/3110.167.133.96 – 10.167.133.9710.167.133.97
5010.167.133.98/3110.167.133.98 – 10.167.133.9910.167.133.99
5110.167.133.100/3110.167.133.100 – 10.167.133.10110.167.133.101
5210.167.133.102/3110.167.133.102 – 10.167.133.10310.167.133.103
5310.167.133.104/3110.167.133.104 – 10.167.133.10510.167.133.105
5410.167.133.106/3110.167.133.106 – 10.167.133.10710.167.133.107
5510.167.133.108/3110.167.133.108 – 10.167.133.10910.167.133.109
5610.167.133.110/3110.167.133.110 – 10.167.133.11110.167.133.111
5710.167.133.112/3110.167.133.112 – 10.167.133.11310.167.133.113
5810.167.133.114/3110.167.133.114 – 10.167.133.11510.167.133.115
5910.167.133.116/3110.167.133.116 – 10.167.133.11710.167.133.117
6010.167.133.118/3110.167.133.118 – 10.167.133.11910.167.133.119
6110.167.133.120/3110.167.133.120 – 10.167.133.12110.167.133.121
6210.167.133.122/3110.167.133.122 – 10.167.133.12310.167.133.123
6310.167.133.124/3110.167.133.124 – 10.167.133.12510.167.133.125
6410.167.133.126/3110.167.133.126 – 10.167.133.12710.167.133.127
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 →