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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)10.9.71.0/25
network10.9.71.0/25
broadcast10.9.71.127
first host10.9.71.1
last host10.9.71.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.9.71.0/25
address00001010.00001001.01000111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00001001.01000111.00000000
broadcast00001010.00001001.01000111.01111111
green = network part, grey = host part
hex0x0a094700
decimal168380160
reverse dns0.71.9.10.in-addr.arpa
ipv4-mapped::ffff:a09:4700

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.9.71.0/3110.9.71.0 – 10.9.71.110.9.71.1
210.9.71.2/3110.9.71.2 – 10.9.71.310.9.71.3
310.9.71.4/3110.9.71.4 – 10.9.71.510.9.71.5
410.9.71.6/3110.9.71.6 – 10.9.71.710.9.71.7
510.9.71.8/3110.9.71.8 – 10.9.71.910.9.71.9
610.9.71.10/3110.9.71.10 – 10.9.71.1110.9.71.11
710.9.71.12/3110.9.71.12 – 10.9.71.1310.9.71.13
810.9.71.14/3110.9.71.14 – 10.9.71.1510.9.71.15
910.9.71.16/3110.9.71.16 – 10.9.71.1710.9.71.17
1010.9.71.18/3110.9.71.18 – 10.9.71.1910.9.71.19
1110.9.71.20/3110.9.71.20 – 10.9.71.2110.9.71.21
1210.9.71.22/3110.9.71.22 – 10.9.71.2310.9.71.23
1310.9.71.24/3110.9.71.24 – 10.9.71.2510.9.71.25
1410.9.71.26/3110.9.71.26 – 10.9.71.2710.9.71.27
1510.9.71.28/3110.9.71.28 – 10.9.71.2910.9.71.29
1610.9.71.30/3110.9.71.30 – 10.9.71.3110.9.71.31
1710.9.71.32/3110.9.71.32 – 10.9.71.3310.9.71.33
1810.9.71.34/3110.9.71.34 – 10.9.71.3510.9.71.35
1910.9.71.36/3110.9.71.36 – 10.9.71.3710.9.71.37
2010.9.71.38/3110.9.71.38 – 10.9.71.3910.9.71.39
2110.9.71.40/3110.9.71.40 – 10.9.71.4110.9.71.41
2210.9.71.42/3110.9.71.42 – 10.9.71.4310.9.71.43
2310.9.71.44/3110.9.71.44 – 10.9.71.4510.9.71.45
2410.9.71.46/3110.9.71.46 – 10.9.71.4710.9.71.47
2510.9.71.48/3110.9.71.48 – 10.9.71.4910.9.71.49
2610.9.71.50/3110.9.71.50 – 10.9.71.5110.9.71.51
2710.9.71.52/3110.9.71.52 – 10.9.71.5310.9.71.53
2810.9.71.54/3110.9.71.54 – 10.9.71.5510.9.71.55
2910.9.71.56/3110.9.71.56 – 10.9.71.5710.9.71.57
3010.9.71.58/3110.9.71.58 – 10.9.71.5910.9.71.59
3110.9.71.60/3110.9.71.60 – 10.9.71.6110.9.71.61
3210.9.71.62/3110.9.71.62 – 10.9.71.6310.9.71.63
3310.9.71.64/3110.9.71.64 – 10.9.71.6510.9.71.65
3410.9.71.66/3110.9.71.66 – 10.9.71.6710.9.71.67
3510.9.71.68/3110.9.71.68 – 10.9.71.6910.9.71.69
3610.9.71.70/3110.9.71.70 – 10.9.71.7110.9.71.71
3710.9.71.72/3110.9.71.72 – 10.9.71.7310.9.71.73
3810.9.71.74/3110.9.71.74 – 10.9.71.7510.9.71.75
3910.9.71.76/3110.9.71.76 – 10.9.71.7710.9.71.77
4010.9.71.78/3110.9.71.78 – 10.9.71.7910.9.71.79
4110.9.71.80/3110.9.71.80 – 10.9.71.8110.9.71.81
4210.9.71.82/3110.9.71.82 – 10.9.71.8310.9.71.83
4310.9.71.84/3110.9.71.84 – 10.9.71.8510.9.71.85
4410.9.71.86/3110.9.71.86 – 10.9.71.8710.9.71.87
4510.9.71.88/3110.9.71.88 – 10.9.71.8910.9.71.89
4610.9.71.90/3110.9.71.90 – 10.9.71.9110.9.71.91
4710.9.71.92/3110.9.71.92 – 10.9.71.9310.9.71.93
4810.9.71.94/3110.9.71.94 – 10.9.71.9510.9.71.95
4910.9.71.96/3110.9.71.96 – 10.9.71.9710.9.71.97
5010.9.71.98/3110.9.71.98 – 10.9.71.9910.9.71.99
5110.9.71.100/3110.9.71.100 – 10.9.71.10110.9.71.101
5210.9.71.102/3110.9.71.102 – 10.9.71.10310.9.71.103
5310.9.71.104/3110.9.71.104 – 10.9.71.10510.9.71.105
5410.9.71.106/3110.9.71.106 – 10.9.71.10710.9.71.107
5510.9.71.108/3110.9.71.108 – 10.9.71.10910.9.71.109
5610.9.71.110/3110.9.71.110 – 10.9.71.11110.9.71.111
5710.9.71.112/3110.9.71.112 – 10.9.71.11310.9.71.113
5810.9.71.114/3110.9.71.114 – 10.9.71.11510.9.71.115
5910.9.71.116/3110.9.71.116 – 10.9.71.11710.9.71.117
6010.9.71.118/3110.9.71.118 – 10.9.71.11910.9.71.119
6110.9.71.120/3110.9.71.120 – 10.9.71.12110.9.71.121
6210.9.71.122/3110.9.71.122 – 10.9.71.12310.9.71.123
6310.9.71.124/3110.9.71.124 – 10.9.71.12510.9.71.125
6410.9.71.126/3110.9.71.126 – 10.9.71.12710.9.71.127
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 →