ip
ipku.in

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)10.2.254.0/25
network10.2.254.0/25
broadcast10.2.254.127
first host10.2.254.1
last host10.2.254.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.254.0/25
address00001010.00000010.11111110.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.11111110.00000000
broadcast00001010.00000010.11111110.01111111
green = network part, grey = host part
hex0x0a02fe00
decimal167968256
reverse dns0.254.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:fe00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.254.0/3110.2.254.0 – 10.2.254.110.2.254.1
210.2.254.2/3110.2.254.2 – 10.2.254.310.2.254.3
310.2.254.4/3110.2.254.4 – 10.2.254.510.2.254.5
410.2.254.6/3110.2.254.6 – 10.2.254.710.2.254.7
510.2.254.8/3110.2.254.8 – 10.2.254.910.2.254.9
610.2.254.10/3110.2.254.10 – 10.2.254.1110.2.254.11
710.2.254.12/3110.2.254.12 – 10.2.254.1310.2.254.13
810.2.254.14/3110.2.254.14 – 10.2.254.1510.2.254.15
910.2.254.16/3110.2.254.16 – 10.2.254.1710.2.254.17
1010.2.254.18/3110.2.254.18 – 10.2.254.1910.2.254.19
1110.2.254.20/3110.2.254.20 – 10.2.254.2110.2.254.21
1210.2.254.22/3110.2.254.22 – 10.2.254.2310.2.254.23
1310.2.254.24/3110.2.254.24 – 10.2.254.2510.2.254.25
1410.2.254.26/3110.2.254.26 – 10.2.254.2710.2.254.27
1510.2.254.28/3110.2.254.28 – 10.2.254.2910.2.254.29
1610.2.254.30/3110.2.254.30 – 10.2.254.3110.2.254.31
1710.2.254.32/3110.2.254.32 – 10.2.254.3310.2.254.33
1810.2.254.34/3110.2.254.34 – 10.2.254.3510.2.254.35
1910.2.254.36/3110.2.254.36 – 10.2.254.3710.2.254.37
2010.2.254.38/3110.2.254.38 – 10.2.254.3910.2.254.39
2110.2.254.40/3110.2.254.40 – 10.2.254.4110.2.254.41
2210.2.254.42/3110.2.254.42 – 10.2.254.4310.2.254.43
2310.2.254.44/3110.2.254.44 – 10.2.254.4510.2.254.45
2410.2.254.46/3110.2.254.46 – 10.2.254.4710.2.254.47
2510.2.254.48/3110.2.254.48 – 10.2.254.4910.2.254.49
2610.2.254.50/3110.2.254.50 – 10.2.254.5110.2.254.51
2710.2.254.52/3110.2.254.52 – 10.2.254.5310.2.254.53
2810.2.254.54/3110.2.254.54 – 10.2.254.5510.2.254.55
2910.2.254.56/3110.2.254.56 – 10.2.254.5710.2.254.57
3010.2.254.58/3110.2.254.58 – 10.2.254.5910.2.254.59
3110.2.254.60/3110.2.254.60 – 10.2.254.6110.2.254.61
3210.2.254.62/3110.2.254.62 – 10.2.254.6310.2.254.63
3310.2.254.64/3110.2.254.64 – 10.2.254.6510.2.254.65
3410.2.254.66/3110.2.254.66 – 10.2.254.6710.2.254.67
3510.2.254.68/3110.2.254.68 – 10.2.254.6910.2.254.69
3610.2.254.70/3110.2.254.70 – 10.2.254.7110.2.254.71
3710.2.254.72/3110.2.254.72 – 10.2.254.7310.2.254.73
3810.2.254.74/3110.2.254.74 – 10.2.254.7510.2.254.75
3910.2.254.76/3110.2.254.76 – 10.2.254.7710.2.254.77
4010.2.254.78/3110.2.254.78 – 10.2.254.7910.2.254.79
4110.2.254.80/3110.2.254.80 – 10.2.254.8110.2.254.81
4210.2.254.82/3110.2.254.82 – 10.2.254.8310.2.254.83
4310.2.254.84/3110.2.254.84 – 10.2.254.8510.2.254.85
4410.2.254.86/3110.2.254.86 – 10.2.254.8710.2.254.87
4510.2.254.88/3110.2.254.88 – 10.2.254.8910.2.254.89
4610.2.254.90/3110.2.254.90 – 10.2.254.9110.2.254.91
4710.2.254.92/3110.2.254.92 – 10.2.254.9310.2.254.93
4810.2.254.94/3110.2.254.94 – 10.2.254.9510.2.254.95
4910.2.254.96/3110.2.254.96 – 10.2.254.9710.2.254.97
5010.2.254.98/3110.2.254.98 – 10.2.254.9910.2.254.99
5110.2.254.100/3110.2.254.100 – 10.2.254.10110.2.254.101
5210.2.254.102/3110.2.254.102 – 10.2.254.10310.2.254.103
5310.2.254.104/3110.2.254.104 – 10.2.254.10510.2.254.105
5410.2.254.106/3110.2.254.106 – 10.2.254.10710.2.254.107
5510.2.254.108/3110.2.254.108 – 10.2.254.10910.2.254.109
5610.2.254.110/3110.2.254.110 – 10.2.254.11110.2.254.111
5710.2.254.112/3110.2.254.112 – 10.2.254.11310.2.254.113
5810.2.254.114/3110.2.254.114 – 10.2.254.11510.2.254.115
5910.2.254.116/3110.2.254.116 – 10.2.254.11710.2.254.117
6010.2.254.118/3110.2.254.118 – 10.2.254.11910.2.254.119
6110.2.254.120/3110.2.254.120 – 10.2.254.12110.2.254.121
6210.2.254.122/3110.2.254.122 – 10.2.254.12310.2.254.123
6310.2.254.124/3110.2.254.124 – 10.2.254.12510.2.254.125
6410.2.254.126/3110.2.254.126 – 10.2.254.12710.2.254.127
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 →