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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)10.7.26.0/25
network10.7.26.0/25
broadcast10.7.26.127
first host10.7.26.1
last host10.7.26.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.7.26.0/25
address00001010.00000111.00011010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000111.00011010.00000000
broadcast00001010.00000111.00011010.01111111
green = network part, grey = host part
hex0x0a071a00
decimal168237568
reverse dns0.26.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:1a00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.7.26.0/3110.7.26.0 – 10.7.26.110.7.26.1
210.7.26.2/3110.7.26.2 – 10.7.26.310.7.26.3
310.7.26.4/3110.7.26.4 – 10.7.26.510.7.26.5
410.7.26.6/3110.7.26.6 – 10.7.26.710.7.26.7
510.7.26.8/3110.7.26.8 – 10.7.26.910.7.26.9
610.7.26.10/3110.7.26.10 – 10.7.26.1110.7.26.11
710.7.26.12/3110.7.26.12 – 10.7.26.1310.7.26.13
810.7.26.14/3110.7.26.14 – 10.7.26.1510.7.26.15
910.7.26.16/3110.7.26.16 – 10.7.26.1710.7.26.17
1010.7.26.18/3110.7.26.18 – 10.7.26.1910.7.26.19
1110.7.26.20/3110.7.26.20 – 10.7.26.2110.7.26.21
1210.7.26.22/3110.7.26.22 – 10.7.26.2310.7.26.23
1310.7.26.24/3110.7.26.24 – 10.7.26.2510.7.26.25
1410.7.26.26/3110.7.26.26 – 10.7.26.2710.7.26.27
1510.7.26.28/3110.7.26.28 – 10.7.26.2910.7.26.29
1610.7.26.30/3110.7.26.30 – 10.7.26.3110.7.26.31
1710.7.26.32/3110.7.26.32 – 10.7.26.3310.7.26.33
1810.7.26.34/3110.7.26.34 – 10.7.26.3510.7.26.35
1910.7.26.36/3110.7.26.36 – 10.7.26.3710.7.26.37
2010.7.26.38/3110.7.26.38 – 10.7.26.3910.7.26.39
2110.7.26.40/3110.7.26.40 – 10.7.26.4110.7.26.41
2210.7.26.42/3110.7.26.42 – 10.7.26.4310.7.26.43
2310.7.26.44/3110.7.26.44 – 10.7.26.4510.7.26.45
2410.7.26.46/3110.7.26.46 – 10.7.26.4710.7.26.47
2510.7.26.48/3110.7.26.48 – 10.7.26.4910.7.26.49
2610.7.26.50/3110.7.26.50 – 10.7.26.5110.7.26.51
2710.7.26.52/3110.7.26.52 – 10.7.26.5310.7.26.53
2810.7.26.54/3110.7.26.54 – 10.7.26.5510.7.26.55
2910.7.26.56/3110.7.26.56 – 10.7.26.5710.7.26.57
3010.7.26.58/3110.7.26.58 – 10.7.26.5910.7.26.59
3110.7.26.60/3110.7.26.60 – 10.7.26.6110.7.26.61
3210.7.26.62/3110.7.26.62 – 10.7.26.6310.7.26.63
3310.7.26.64/3110.7.26.64 – 10.7.26.6510.7.26.65
3410.7.26.66/3110.7.26.66 – 10.7.26.6710.7.26.67
3510.7.26.68/3110.7.26.68 – 10.7.26.6910.7.26.69
3610.7.26.70/3110.7.26.70 – 10.7.26.7110.7.26.71
3710.7.26.72/3110.7.26.72 – 10.7.26.7310.7.26.73
3810.7.26.74/3110.7.26.74 – 10.7.26.7510.7.26.75
3910.7.26.76/3110.7.26.76 – 10.7.26.7710.7.26.77
4010.7.26.78/3110.7.26.78 – 10.7.26.7910.7.26.79
4110.7.26.80/3110.7.26.80 – 10.7.26.8110.7.26.81
4210.7.26.82/3110.7.26.82 – 10.7.26.8310.7.26.83
4310.7.26.84/3110.7.26.84 – 10.7.26.8510.7.26.85
4410.7.26.86/3110.7.26.86 – 10.7.26.8710.7.26.87
4510.7.26.88/3110.7.26.88 – 10.7.26.8910.7.26.89
4610.7.26.90/3110.7.26.90 – 10.7.26.9110.7.26.91
4710.7.26.92/3110.7.26.92 – 10.7.26.9310.7.26.93
4810.7.26.94/3110.7.26.94 – 10.7.26.9510.7.26.95
4910.7.26.96/3110.7.26.96 – 10.7.26.9710.7.26.97
5010.7.26.98/3110.7.26.98 – 10.7.26.9910.7.26.99
5110.7.26.100/3110.7.26.100 – 10.7.26.10110.7.26.101
5210.7.26.102/3110.7.26.102 – 10.7.26.10310.7.26.103
5310.7.26.104/3110.7.26.104 – 10.7.26.10510.7.26.105
5410.7.26.106/3110.7.26.106 – 10.7.26.10710.7.26.107
5510.7.26.108/3110.7.26.108 – 10.7.26.10910.7.26.109
5610.7.26.110/3110.7.26.110 – 10.7.26.11110.7.26.111
5710.7.26.112/3110.7.26.112 – 10.7.26.11310.7.26.113
5810.7.26.114/3110.7.26.114 – 10.7.26.11510.7.26.115
5910.7.26.116/3110.7.26.116 – 10.7.26.11710.7.26.117
6010.7.26.118/3110.7.26.118 – 10.7.26.11910.7.26.119
6110.7.26.120/3110.7.26.120 – 10.7.26.12110.7.26.121
6210.7.26.122/3110.7.26.122 – 10.7.26.12310.7.26.123
6310.7.26.124/3110.7.26.124 – 10.7.26.12510.7.26.125
6410.7.26.126/3110.7.26.126 – 10.7.26.12710.7.26.127
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 →