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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)10.167.220.0/25
network10.167.220.0/25
broadcast10.167.220.127
first host10.167.220.1
last host10.167.220.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.220.0/25
address00001010.10100111.11011100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11011100.00000000
broadcast00001010.10100111.11011100.01111111
green = network part, grey = host part
hex0x0aa7dc00
decimal178772992
reverse dns0.220.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:dc00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.220.0/3110.167.220.0 – 10.167.220.110.167.220.1
210.167.220.2/3110.167.220.2 – 10.167.220.310.167.220.3
310.167.220.4/3110.167.220.4 – 10.167.220.510.167.220.5
410.167.220.6/3110.167.220.6 – 10.167.220.710.167.220.7
510.167.220.8/3110.167.220.8 – 10.167.220.910.167.220.9
610.167.220.10/3110.167.220.10 – 10.167.220.1110.167.220.11
710.167.220.12/3110.167.220.12 – 10.167.220.1310.167.220.13
810.167.220.14/3110.167.220.14 – 10.167.220.1510.167.220.15
910.167.220.16/3110.167.220.16 – 10.167.220.1710.167.220.17
1010.167.220.18/3110.167.220.18 – 10.167.220.1910.167.220.19
1110.167.220.20/3110.167.220.20 – 10.167.220.2110.167.220.21
1210.167.220.22/3110.167.220.22 – 10.167.220.2310.167.220.23
1310.167.220.24/3110.167.220.24 – 10.167.220.2510.167.220.25
1410.167.220.26/3110.167.220.26 – 10.167.220.2710.167.220.27
1510.167.220.28/3110.167.220.28 – 10.167.220.2910.167.220.29
1610.167.220.30/3110.167.220.30 – 10.167.220.3110.167.220.31
1710.167.220.32/3110.167.220.32 – 10.167.220.3310.167.220.33
1810.167.220.34/3110.167.220.34 – 10.167.220.3510.167.220.35
1910.167.220.36/3110.167.220.36 – 10.167.220.3710.167.220.37
2010.167.220.38/3110.167.220.38 – 10.167.220.3910.167.220.39
2110.167.220.40/3110.167.220.40 – 10.167.220.4110.167.220.41
2210.167.220.42/3110.167.220.42 – 10.167.220.4310.167.220.43
2310.167.220.44/3110.167.220.44 – 10.167.220.4510.167.220.45
2410.167.220.46/3110.167.220.46 – 10.167.220.4710.167.220.47
2510.167.220.48/3110.167.220.48 – 10.167.220.4910.167.220.49
2610.167.220.50/3110.167.220.50 – 10.167.220.5110.167.220.51
2710.167.220.52/3110.167.220.52 – 10.167.220.5310.167.220.53
2810.167.220.54/3110.167.220.54 – 10.167.220.5510.167.220.55
2910.167.220.56/3110.167.220.56 – 10.167.220.5710.167.220.57
3010.167.220.58/3110.167.220.58 – 10.167.220.5910.167.220.59
3110.167.220.60/3110.167.220.60 – 10.167.220.6110.167.220.61
3210.167.220.62/3110.167.220.62 – 10.167.220.6310.167.220.63
3310.167.220.64/3110.167.220.64 – 10.167.220.6510.167.220.65
3410.167.220.66/3110.167.220.66 – 10.167.220.6710.167.220.67
3510.167.220.68/3110.167.220.68 – 10.167.220.6910.167.220.69
3610.167.220.70/3110.167.220.70 – 10.167.220.7110.167.220.71
3710.167.220.72/3110.167.220.72 – 10.167.220.7310.167.220.73
3810.167.220.74/3110.167.220.74 – 10.167.220.7510.167.220.75
3910.167.220.76/3110.167.220.76 – 10.167.220.7710.167.220.77
4010.167.220.78/3110.167.220.78 – 10.167.220.7910.167.220.79
4110.167.220.80/3110.167.220.80 – 10.167.220.8110.167.220.81
4210.167.220.82/3110.167.220.82 – 10.167.220.8310.167.220.83
4310.167.220.84/3110.167.220.84 – 10.167.220.8510.167.220.85
4410.167.220.86/3110.167.220.86 – 10.167.220.8710.167.220.87
4510.167.220.88/3110.167.220.88 – 10.167.220.8910.167.220.89
4610.167.220.90/3110.167.220.90 – 10.167.220.9110.167.220.91
4710.167.220.92/3110.167.220.92 – 10.167.220.9310.167.220.93
4810.167.220.94/3110.167.220.94 – 10.167.220.9510.167.220.95
4910.167.220.96/3110.167.220.96 – 10.167.220.9710.167.220.97
5010.167.220.98/3110.167.220.98 – 10.167.220.9910.167.220.99
5110.167.220.100/3110.167.220.100 – 10.167.220.10110.167.220.101
5210.167.220.102/3110.167.220.102 – 10.167.220.10310.167.220.103
5310.167.220.104/3110.167.220.104 – 10.167.220.10510.167.220.105
5410.167.220.106/3110.167.220.106 – 10.167.220.10710.167.220.107
5510.167.220.108/3110.167.220.108 – 10.167.220.10910.167.220.109
5610.167.220.110/3110.167.220.110 – 10.167.220.11110.167.220.111
5710.167.220.112/3110.167.220.112 – 10.167.220.11310.167.220.113
5810.167.220.114/3110.167.220.114 – 10.167.220.11510.167.220.115
5910.167.220.116/3110.167.220.116 – 10.167.220.11710.167.220.117
6010.167.220.118/3110.167.220.118 – 10.167.220.11910.167.220.119
6110.167.220.120/3110.167.220.120 – 10.167.220.12110.167.220.121
6210.167.220.122/3110.167.220.122 – 10.167.220.12310.167.220.123
6310.167.220.124/3110.167.220.124 – 10.167.220.12510.167.220.125
6410.167.220.126/3110.167.220.126 – 10.167.220.12710.167.220.127
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 →