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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)10.71.76.0/25
network10.71.76.0/25
broadcast10.71.76.127
first host10.71.76.1
last host10.71.76.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.71.76.0/25
address00001010.01000111.01001100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01000111.01001100.00000000
broadcast00001010.01000111.01001100.01111111
green = network part, grey = host part
hex0x0a474c00
decimal172444672
reverse dns0.76.71.10.in-addr.arpa
ipv4-mapped::ffff:a47:4c00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.71.76.0/3110.71.76.0 – 10.71.76.110.71.76.1
210.71.76.2/3110.71.76.2 – 10.71.76.310.71.76.3
310.71.76.4/3110.71.76.4 – 10.71.76.510.71.76.5
410.71.76.6/3110.71.76.6 – 10.71.76.710.71.76.7
510.71.76.8/3110.71.76.8 – 10.71.76.910.71.76.9
610.71.76.10/3110.71.76.10 – 10.71.76.1110.71.76.11
710.71.76.12/3110.71.76.12 – 10.71.76.1310.71.76.13
810.71.76.14/3110.71.76.14 – 10.71.76.1510.71.76.15
910.71.76.16/3110.71.76.16 – 10.71.76.1710.71.76.17
1010.71.76.18/3110.71.76.18 – 10.71.76.1910.71.76.19
1110.71.76.20/3110.71.76.20 – 10.71.76.2110.71.76.21
1210.71.76.22/3110.71.76.22 – 10.71.76.2310.71.76.23
1310.71.76.24/3110.71.76.24 – 10.71.76.2510.71.76.25
1410.71.76.26/3110.71.76.26 – 10.71.76.2710.71.76.27
1510.71.76.28/3110.71.76.28 – 10.71.76.2910.71.76.29
1610.71.76.30/3110.71.76.30 – 10.71.76.3110.71.76.31
1710.71.76.32/3110.71.76.32 – 10.71.76.3310.71.76.33
1810.71.76.34/3110.71.76.34 – 10.71.76.3510.71.76.35
1910.71.76.36/3110.71.76.36 – 10.71.76.3710.71.76.37
2010.71.76.38/3110.71.76.38 – 10.71.76.3910.71.76.39
2110.71.76.40/3110.71.76.40 – 10.71.76.4110.71.76.41
2210.71.76.42/3110.71.76.42 – 10.71.76.4310.71.76.43
2310.71.76.44/3110.71.76.44 – 10.71.76.4510.71.76.45
2410.71.76.46/3110.71.76.46 – 10.71.76.4710.71.76.47
2510.71.76.48/3110.71.76.48 – 10.71.76.4910.71.76.49
2610.71.76.50/3110.71.76.50 – 10.71.76.5110.71.76.51
2710.71.76.52/3110.71.76.52 – 10.71.76.5310.71.76.53
2810.71.76.54/3110.71.76.54 – 10.71.76.5510.71.76.55
2910.71.76.56/3110.71.76.56 – 10.71.76.5710.71.76.57
3010.71.76.58/3110.71.76.58 – 10.71.76.5910.71.76.59
3110.71.76.60/3110.71.76.60 – 10.71.76.6110.71.76.61
3210.71.76.62/3110.71.76.62 – 10.71.76.6310.71.76.63
3310.71.76.64/3110.71.76.64 – 10.71.76.6510.71.76.65
3410.71.76.66/3110.71.76.66 – 10.71.76.6710.71.76.67
3510.71.76.68/3110.71.76.68 – 10.71.76.6910.71.76.69
3610.71.76.70/3110.71.76.70 – 10.71.76.7110.71.76.71
3710.71.76.72/3110.71.76.72 – 10.71.76.7310.71.76.73
3810.71.76.74/3110.71.76.74 – 10.71.76.7510.71.76.75
3910.71.76.76/3110.71.76.76 – 10.71.76.7710.71.76.77
4010.71.76.78/3110.71.76.78 – 10.71.76.7910.71.76.79
4110.71.76.80/3110.71.76.80 – 10.71.76.8110.71.76.81
4210.71.76.82/3110.71.76.82 – 10.71.76.8310.71.76.83
4310.71.76.84/3110.71.76.84 – 10.71.76.8510.71.76.85
4410.71.76.86/3110.71.76.86 – 10.71.76.8710.71.76.87
4510.71.76.88/3110.71.76.88 – 10.71.76.8910.71.76.89
4610.71.76.90/3110.71.76.90 – 10.71.76.9110.71.76.91
4710.71.76.92/3110.71.76.92 – 10.71.76.9310.71.76.93
4810.71.76.94/3110.71.76.94 – 10.71.76.9510.71.76.95
4910.71.76.96/3110.71.76.96 – 10.71.76.9710.71.76.97
5010.71.76.98/3110.71.76.98 – 10.71.76.9910.71.76.99
5110.71.76.100/3110.71.76.100 – 10.71.76.10110.71.76.101
5210.71.76.102/3110.71.76.102 – 10.71.76.10310.71.76.103
5310.71.76.104/3110.71.76.104 – 10.71.76.10510.71.76.105
5410.71.76.106/3110.71.76.106 – 10.71.76.10710.71.76.107
5510.71.76.108/3110.71.76.108 – 10.71.76.10910.71.76.109
5610.71.76.110/3110.71.76.110 – 10.71.76.11110.71.76.111
5710.71.76.112/3110.71.76.112 – 10.71.76.11310.71.76.113
5810.71.76.114/3110.71.76.114 – 10.71.76.11510.71.76.115
5910.71.76.116/3110.71.76.116 – 10.71.76.11710.71.76.117
6010.71.76.118/3110.71.76.118 – 10.71.76.11910.71.76.119
6110.71.76.120/3110.71.76.120 – 10.71.76.12110.71.76.121
6210.71.76.122/3110.71.76.122 – 10.71.76.12310.71.76.123
6310.71.76.124/3110.71.76.124 – 10.71.76.12510.71.76.125
6410.71.76.126/3110.71.76.126 – 10.71.76.12710.71.76.127
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 →