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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)10.4.82.0/25
network10.4.82.0/25
broadcast10.4.82.127
first host10.4.82.1
last host10.4.82.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.4.82.0/25
address00001010.00000100.01010010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000100.01010010.00000000
broadcast00001010.00000100.01010010.01111111
green = network part, grey = host part
hex0x0a045200
decimal168055296
reverse dns0.82.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:5200

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.82.0/3110.4.82.0 – 10.4.82.110.4.82.1
210.4.82.2/3110.4.82.2 – 10.4.82.310.4.82.3
310.4.82.4/3110.4.82.4 – 10.4.82.510.4.82.5
410.4.82.6/3110.4.82.6 – 10.4.82.710.4.82.7
510.4.82.8/3110.4.82.8 – 10.4.82.910.4.82.9
610.4.82.10/3110.4.82.10 – 10.4.82.1110.4.82.11
710.4.82.12/3110.4.82.12 – 10.4.82.1310.4.82.13
810.4.82.14/3110.4.82.14 – 10.4.82.1510.4.82.15
910.4.82.16/3110.4.82.16 – 10.4.82.1710.4.82.17
1010.4.82.18/3110.4.82.18 – 10.4.82.1910.4.82.19
1110.4.82.20/3110.4.82.20 – 10.4.82.2110.4.82.21
1210.4.82.22/3110.4.82.22 – 10.4.82.2310.4.82.23
1310.4.82.24/3110.4.82.24 – 10.4.82.2510.4.82.25
1410.4.82.26/3110.4.82.26 – 10.4.82.2710.4.82.27
1510.4.82.28/3110.4.82.28 – 10.4.82.2910.4.82.29
1610.4.82.30/3110.4.82.30 – 10.4.82.3110.4.82.31
1710.4.82.32/3110.4.82.32 – 10.4.82.3310.4.82.33
1810.4.82.34/3110.4.82.34 – 10.4.82.3510.4.82.35
1910.4.82.36/3110.4.82.36 – 10.4.82.3710.4.82.37
2010.4.82.38/3110.4.82.38 – 10.4.82.3910.4.82.39
2110.4.82.40/3110.4.82.40 – 10.4.82.4110.4.82.41
2210.4.82.42/3110.4.82.42 – 10.4.82.4310.4.82.43
2310.4.82.44/3110.4.82.44 – 10.4.82.4510.4.82.45
2410.4.82.46/3110.4.82.46 – 10.4.82.4710.4.82.47
2510.4.82.48/3110.4.82.48 – 10.4.82.4910.4.82.49
2610.4.82.50/3110.4.82.50 – 10.4.82.5110.4.82.51
2710.4.82.52/3110.4.82.52 – 10.4.82.5310.4.82.53
2810.4.82.54/3110.4.82.54 – 10.4.82.5510.4.82.55
2910.4.82.56/3110.4.82.56 – 10.4.82.5710.4.82.57
3010.4.82.58/3110.4.82.58 – 10.4.82.5910.4.82.59
3110.4.82.60/3110.4.82.60 – 10.4.82.6110.4.82.61
3210.4.82.62/3110.4.82.62 – 10.4.82.6310.4.82.63
3310.4.82.64/3110.4.82.64 – 10.4.82.6510.4.82.65
3410.4.82.66/3110.4.82.66 – 10.4.82.6710.4.82.67
3510.4.82.68/3110.4.82.68 – 10.4.82.6910.4.82.69
3610.4.82.70/3110.4.82.70 – 10.4.82.7110.4.82.71
3710.4.82.72/3110.4.82.72 – 10.4.82.7310.4.82.73
3810.4.82.74/3110.4.82.74 – 10.4.82.7510.4.82.75
3910.4.82.76/3110.4.82.76 – 10.4.82.7710.4.82.77
4010.4.82.78/3110.4.82.78 – 10.4.82.7910.4.82.79
4110.4.82.80/3110.4.82.80 – 10.4.82.8110.4.82.81
4210.4.82.82/3110.4.82.82 – 10.4.82.8310.4.82.83
4310.4.82.84/3110.4.82.84 – 10.4.82.8510.4.82.85
4410.4.82.86/3110.4.82.86 – 10.4.82.8710.4.82.87
4510.4.82.88/3110.4.82.88 – 10.4.82.8910.4.82.89
4610.4.82.90/3110.4.82.90 – 10.4.82.9110.4.82.91
4710.4.82.92/3110.4.82.92 – 10.4.82.9310.4.82.93
4810.4.82.94/3110.4.82.94 – 10.4.82.9510.4.82.95
4910.4.82.96/3110.4.82.96 – 10.4.82.9710.4.82.97
5010.4.82.98/3110.4.82.98 – 10.4.82.9910.4.82.99
5110.4.82.100/3110.4.82.100 – 10.4.82.10110.4.82.101
5210.4.82.102/3110.4.82.102 – 10.4.82.10310.4.82.103
5310.4.82.104/3110.4.82.104 – 10.4.82.10510.4.82.105
5410.4.82.106/3110.4.82.106 – 10.4.82.10710.4.82.107
5510.4.82.108/3110.4.82.108 – 10.4.82.10910.4.82.109
5610.4.82.110/3110.4.82.110 – 10.4.82.11110.4.82.111
5710.4.82.112/3110.4.82.112 – 10.4.82.11310.4.82.113
5810.4.82.114/3110.4.82.114 – 10.4.82.11510.4.82.115
5910.4.82.116/3110.4.82.116 – 10.4.82.11710.4.82.117
6010.4.82.118/3110.4.82.118 – 10.4.82.11910.4.82.119
6110.4.82.120/3110.4.82.120 – 10.4.82.12110.4.82.121
6210.4.82.122/3110.4.82.122 – 10.4.82.12310.4.82.123
6310.4.82.124/3110.4.82.124 – 10.4.82.12510.4.82.125
6410.4.82.126/3110.4.82.126 – 10.4.82.12710.4.82.127
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 →