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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)10.167.121.0/25
network10.167.121.0/25
broadcast10.167.121.127
first host10.167.121.1
last host10.167.121.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.121.0/25
address00001010.10100111.01111001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.01111001.00000000
broadcast00001010.10100111.01111001.01111111
green = network part, grey = host part
hex0x0aa77900
decimal178747648
reverse dns0.121.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:7900

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.121.0/3110.167.121.0 – 10.167.121.110.167.121.1
210.167.121.2/3110.167.121.2 – 10.167.121.310.167.121.3
310.167.121.4/3110.167.121.4 – 10.167.121.510.167.121.5
410.167.121.6/3110.167.121.6 – 10.167.121.710.167.121.7
510.167.121.8/3110.167.121.8 – 10.167.121.910.167.121.9
610.167.121.10/3110.167.121.10 – 10.167.121.1110.167.121.11
710.167.121.12/3110.167.121.12 – 10.167.121.1310.167.121.13
810.167.121.14/3110.167.121.14 – 10.167.121.1510.167.121.15
910.167.121.16/3110.167.121.16 – 10.167.121.1710.167.121.17
1010.167.121.18/3110.167.121.18 – 10.167.121.1910.167.121.19
1110.167.121.20/3110.167.121.20 – 10.167.121.2110.167.121.21
1210.167.121.22/3110.167.121.22 – 10.167.121.2310.167.121.23
1310.167.121.24/3110.167.121.24 – 10.167.121.2510.167.121.25
1410.167.121.26/3110.167.121.26 – 10.167.121.2710.167.121.27
1510.167.121.28/3110.167.121.28 – 10.167.121.2910.167.121.29
1610.167.121.30/3110.167.121.30 – 10.167.121.3110.167.121.31
1710.167.121.32/3110.167.121.32 – 10.167.121.3310.167.121.33
1810.167.121.34/3110.167.121.34 – 10.167.121.3510.167.121.35
1910.167.121.36/3110.167.121.36 – 10.167.121.3710.167.121.37
2010.167.121.38/3110.167.121.38 – 10.167.121.3910.167.121.39
2110.167.121.40/3110.167.121.40 – 10.167.121.4110.167.121.41
2210.167.121.42/3110.167.121.42 – 10.167.121.4310.167.121.43
2310.167.121.44/3110.167.121.44 – 10.167.121.4510.167.121.45
2410.167.121.46/3110.167.121.46 – 10.167.121.4710.167.121.47
2510.167.121.48/3110.167.121.48 – 10.167.121.4910.167.121.49
2610.167.121.50/3110.167.121.50 – 10.167.121.5110.167.121.51
2710.167.121.52/3110.167.121.52 – 10.167.121.5310.167.121.53
2810.167.121.54/3110.167.121.54 – 10.167.121.5510.167.121.55
2910.167.121.56/3110.167.121.56 – 10.167.121.5710.167.121.57
3010.167.121.58/3110.167.121.58 – 10.167.121.5910.167.121.59
3110.167.121.60/3110.167.121.60 – 10.167.121.6110.167.121.61
3210.167.121.62/3110.167.121.62 – 10.167.121.6310.167.121.63
3310.167.121.64/3110.167.121.64 – 10.167.121.6510.167.121.65
3410.167.121.66/3110.167.121.66 – 10.167.121.6710.167.121.67
3510.167.121.68/3110.167.121.68 – 10.167.121.6910.167.121.69
3610.167.121.70/3110.167.121.70 – 10.167.121.7110.167.121.71
3710.167.121.72/3110.167.121.72 – 10.167.121.7310.167.121.73
3810.167.121.74/3110.167.121.74 – 10.167.121.7510.167.121.75
3910.167.121.76/3110.167.121.76 – 10.167.121.7710.167.121.77
4010.167.121.78/3110.167.121.78 – 10.167.121.7910.167.121.79
4110.167.121.80/3110.167.121.80 – 10.167.121.8110.167.121.81
4210.167.121.82/3110.167.121.82 – 10.167.121.8310.167.121.83
4310.167.121.84/3110.167.121.84 – 10.167.121.8510.167.121.85
4410.167.121.86/3110.167.121.86 – 10.167.121.8710.167.121.87
4510.167.121.88/3110.167.121.88 – 10.167.121.8910.167.121.89
4610.167.121.90/3110.167.121.90 – 10.167.121.9110.167.121.91
4710.167.121.92/3110.167.121.92 – 10.167.121.9310.167.121.93
4810.167.121.94/3110.167.121.94 – 10.167.121.9510.167.121.95
4910.167.121.96/3110.167.121.96 – 10.167.121.9710.167.121.97
5010.167.121.98/3110.167.121.98 – 10.167.121.9910.167.121.99
5110.167.121.100/3110.167.121.100 – 10.167.121.10110.167.121.101
5210.167.121.102/3110.167.121.102 – 10.167.121.10310.167.121.103
5310.167.121.104/3110.167.121.104 – 10.167.121.10510.167.121.105
5410.167.121.106/3110.167.121.106 – 10.167.121.10710.167.121.107
5510.167.121.108/3110.167.121.108 – 10.167.121.10910.167.121.109
5610.167.121.110/3110.167.121.110 – 10.167.121.11110.167.121.111
5710.167.121.112/3110.167.121.112 – 10.167.121.11310.167.121.113
5810.167.121.114/3110.167.121.114 – 10.167.121.11510.167.121.115
5910.167.121.116/3110.167.121.116 – 10.167.121.11710.167.121.117
6010.167.121.118/3110.167.121.118 – 10.167.121.11910.167.121.119
6110.167.121.120/3110.167.121.120 – 10.167.121.12110.167.121.121
6210.167.121.122/3110.167.121.122 – 10.167.121.12310.167.121.123
6310.167.121.124/3110.167.121.124 – 10.167.121.12510.167.121.125
6410.167.121.126/3110.167.121.126 – 10.167.121.12710.167.121.127
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 →