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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)10.166.63.0/25
network10.166.63.0/25
broadcast10.166.63.127
first host10.166.63.1
last host10.166.63.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.166.63.0/25
address00001010.10100110.00111111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100110.00111111.00000000
broadcast00001010.10100110.00111111.01111111
green = network part, grey = host part
hex0x0aa63f00
decimal178667264
reverse dns0.63.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:3f00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.63.0/3110.166.63.0 – 10.166.63.110.166.63.1
210.166.63.2/3110.166.63.2 – 10.166.63.310.166.63.3
310.166.63.4/3110.166.63.4 – 10.166.63.510.166.63.5
410.166.63.6/3110.166.63.6 – 10.166.63.710.166.63.7
510.166.63.8/3110.166.63.8 – 10.166.63.910.166.63.9
610.166.63.10/3110.166.63.10 – 10.166.63.1110.166.63.11
710.166.63.12/3110.166.63.12 – 10.166.63.1310.166.63.13
810.166.63.14/3110.166.63.14 – 10.166.63.1510.166.63.15
910.166.63.16/3110.166.63.16 – 10.166.63.1710.166.63.17
1010.166.63.18/3110.166.63.18 – 10.166.63.1910.166.63.19
1110.166.63.20/3110.166.63.20 – 10.166.63.2110.166.63.21
1210.166.63.22/3110.166.63.22 – 10.166.63.2310.166.63.23
1310.166.63.24/3110.166.63.24 – 10.166.63.2510.166.63.25
1410.166.63.26/3110.166.63.26 – 10.166.63.2710.166.63.27
1510.166.63.28/3110.166.63.28 – 10.166.63.2910.166.63.29
1610.166.63.30/3110.166.63.30 – 10.166.63.3110.166.63.31
1710.166.63.32/3110.166.63.32 – 10.166.63.3310.166.63.33
1810.166.63.34/3110.166.63.34 – 10.166.63.3510.166.63.35
1910.166.63.36/3110.166.63.36 – 10.166.63.3710.166.63.37
2010.166.63.38/3110.166.63.38 – 10.166.63.3910.166.63.39
2110.166.63.40/3110.166.63.40 – 10.166.63.4110.166.63.41
2210.166.63.42/3110.166.63.42 – 10.166.63.4310.166.63.43
2310.166.63.44/3110.166.63.44 – 10.166.63.4510.166.63.45
2410.166.63.46/3110.166.63.46 – 10.166.63.4710.166.63.47
2510.166.63.48/3110.166.63.48 – 10.166.63.4910.166.63.49
2610.166.63.50/3110.166.63.50 – 10.166.63.5110.166.63.51
2710.166.63.52/3110.166.63.52 – 10.166.63.5310.166.63.53
2810.166.63.54/3110.166.63.54 – 10.166.63.5510.166.63.55
2910.166.63.56/3110.166.63.56 – 10.166.63.5710.166.63.57
3010.166.63.58/3110.166.63.58 – 10.166.63.5910.166.63.59
3110.166.63.60/3110.166.63.60 – 10.166.63.6110.166.63.61
3210.166.63.62/3110.166.63.62 – 10.166.63.6310.166.63.63
3310.166.63.64/3110.166.63.64 – 10.166.63.6510.166.63.65
3410.166.63.66/3110.166.63.66 – 10.166.63.6710.166.63.67
3510.166.63.68/3110.166.63.68 – 10.166.63.6910.166.63.69
3610.166.63.70/3110.166.63.70 – 10.166.63.7110.166.63.71
3710.166.63.72/3110.166.63.72 – 10.166.63.7310.166.63.73
3810.166.63.74/3110.166.63.74 – 10.166.63.7510.166.63.75
3910.166.63.76/3110.166.63.76 – 10.166.63.7710.166.63.77
4010.166.63.78/3110.166.63.78 – 10.166.63.7910.166.63.79
4110.166.63.80/3110.166.63.80 – 10.166.63.8110.166.63.81
4210.166.63.82/3110.166.63.82 – 10.166.63.8310.166.63.83
4310.166.63.84/3110.166.63.84 – 10.166.63.8510.166.63.85
4410.166.63.86/3110.166.63.86 – 10.166.63.8710.166.63.87
4510.166.63.88/3110.166.63.88 – 10.166.63.8910.166.63.89
4610.166.63.90/3110.166.63.90 – 10.166.63.9110.166.63.91
4710.166.63.92/3110.166.63.92 – 10.166.63.9310.166.63.93
4810.166.63.94/3110.166.63.94 – 10.166.63.9510.166.63.95
4910.166.63.96/3110.166.63.96 – 10.166.63.9710.166.63.97
5010.166.63.98/3110.166.63.98 – 10.166.63.9910.166.63.99
5110.166.63.100/3110.166.63.100 – 10.166.63.10110.166.63.101
5210.166.63.102/3110.166.63.102 – 10.166.63.10310.166.63.103
5310.166.63.104/3110.166.63.104 – 10.166.63.10510.166.63.105
5410.166.63.106/3110.166.63.106 – 10.166.63.10710.166.63.107
5510.166.63.108/3110.166.63.108 – 10.166.63.10910.166.63.109
5610.166.63.110/3110.166.63.110 – 10.166.63.11110.166.63.111
5710.166.63.112/3110.166.63.112 – 10.166.63.11310.166.63.113
5810.166.63.114/3110.166.63.114 – 10.166.63.11510.166.63.115
5910.166.63.116/3110.166.63.116 – 10.166.63.11710.166.63.117
6010.166.63.118/3110.166.63.118 – 10.166.63.11910.166.63.119
6110.166.63.120/3110.166.63.120 – 10.166.63.12110.166.63.121
6210.166.63.122/3110.166.63.122 – 10.166.63.12310.166.63.123
6310.166.63.124/3110.166.63.124 – 10.166.63.12510.166.63.125
6410.166.63.126/3110.166.63.126 – 10.166.63.12710.166.63.127
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 →