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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)10.131.41.0/25
network10.131.41.0/25
broadcast10.131.41.127
first host10.131.41.1
last host10.131.41.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.131.41.0/25
address00001010.10000011.00101001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10000011.00101001.00000000
broadcast00001010.10000011.00101001.01111111
green = network part, grey = host part
hex0x0a832900
decimal176367872
reverse dns0.41.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:2900

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.131.41.0/3110.131.41.0 – 10.131.41.110.131.41.1
210.131.41.2/3110.131.41.2 – 10.131.41.310.131.41.3
310.131.41.4/3110.131.41.4 – 10.131.41.510.131.41.5
410.131.41.6/3110.131.41.6 – 10.131.41.710.131.41.7
510.131.41.8/3110.131.41.8 – 10.131.41.910.131.41.9
610.131.41.10/3110.131.41.10 – 10.131.41.1110.131.41.11
710.131.41.12/3110.131.41.12 – 10.131.41.1310.131.41.13
810.131.41.14/3110.131.41.14 – 10.131.41.1510.131.41.15
910.131.41.16/3110.131.41.16 – 10.131.41.1710.131.41.17
1010.131.41.18/3110.131.41.18 – 10.131.41.1910.131.41.19
1110.131.41.20/3110.131.41.20 – 10.131.41.2110.131.41.21
1210.131.41.22/3110.131.41.22 – 10.131.41.2310.131.41.23
1310.131.41.24/3110.131.41.24 – 10.131.41.2510.131.41.25
1410.131.41.26/3110.131.41.26 – 10.131.41.2710.131.41.27
1510.131.41.28/3110.131.41.28 – 10.131.41.2910.131.41.29
1610.131.41.30/3110.131.41.30 – 10.131.41.3110.131.41.31
1710.131.41.32/3110.131.41.32 – 10.131.41.3310.131.41.33
1810.131.41.34/3110.131.41.34 – 10.131.41.3510.131.41.35
1910.131.41.36/3110.131.41.36 – 10.131.41.3710.131.41.37
2010.131.41.38/3110.131.41.38 – 10.131.41.3910.131.41.39
2110.131.41.40/3110.131.41.40 – 10.131.41.4110.131.41.41
2210.131.41.42/3110.131.41.42 – 10.131.41.4310.131.41.43
2310.131.41.44/3110.131.41.44 – 10.131.41.4510.131.41.45
2410.131.41.46/3110.131.41.46 – 10.131.41.4710.131.41.47
2510.131.41.48/3110.131.41.48 – 10.131.41.4910.131.41.49
2610.131.41.50/3110.131.41.50 – 10.131.41.5110.131.41.51
2710.131.41.52/3110.131.41.52 – 10.131.41.5310.131.41.53
2810.131.41.54/3110.131.41.54 – 10.131.41.5510.131.41.55
2910.131.41.56/3110.131.41.56 – 10.131.41.5710.131.41.57
3010.131.41.58/3110.131.41.58 – 10.131.41.5910.131.41.59
3110.131.41.60/3110.131.41.60 – 10.131.41.6110.131.41.61
3210.131.41.62/3110.131.41.62 – 10.131.41.6310.131.41.63
3310.131.41.64/3110.131.41.64 – 10.131.41.6510.131.41.65
3410.131.41.66/3110.131.41.66 – 10.131.41.6710.131.41.67
3510.131.41.68/3110.131.41.68 – 10.131.41.6910.131.41.69
3610.131.41.70/3110.131.41.70 – 10.131.41.7110.131.41.71
3710.131.41.72/3110.131.41.72 – 10.131.41.7310.131.41.73
3810.131.41.74/3110.131.41.74 – 10.131.41.7510.131.41.75
3910.131.41.76/3110.131.41.76 – 10.131.41.7710.131.41.77
4010.131.41.78/3110.131.41.78 – 10.131.41.7910.131.41.79
4110.131.41.80/3110.131.41.80 – 10.131.41.8110.131.41.81
4210.131.41.82/3110.131.41.82 – 10.131.41.8310.131.41.83
4310.131.41.84/3110.131.41.84 – 10.131.41.8510.131.41.85
4410.131.41.86/3110.131.41.86 – 10.131.41.8710.131.41.87
4510.131.41.88/3110.131.41.88 – 10.131.41.8910.131.41.89
4610.131.41.90/3110.131.41.90 – 10.131.41.9110.131.41.91
4710.131.41.92/3110.131.41.92 – 10.131.41.9310.131.41.93
4810.131.41.94/3110.131.41.94 – 10.131.41.9510.131.41.95
4910.131.41.96/3110.131.41.96 – 10.131.41.9710.131.41.97
5010.131.41.98/3110.131.41.98 – 10.131.41.9910.131.41.99
5110.131.41.100/3110.131.41.100 – 10.131.41.10110.131.41.101
5210.131.41.102/3110.131.41.102 – 10.131.41.10310.131.41.103
5310.131.41.104/3110.131.41.104 – 10.131.41.10510.131.41.105
5410.131.41.106/3110.131.41.106 – 10.131.41.10710.131.41.107
5510.131.41.108/3110.131.41.108 – 10.131.41.10910.131.41.109
5610.131.41.110/3110.131.41.110 – 10.131.41.11110.131.41.111
5710.131.41.112/3110.131.41.112 – 10.131.41.11310.131.41.113
5810.131.41.114/3110.131.41.114 – 10.131.41.11510.131.41.115
5910.131.41.116/3110.131.41.116 – 10.131.41.11710.131.41.117
6010.131.41.118/3110.131.41.118 – 10.131.41.11910.131.41.119
6110.131.41.120/3110.131.41.120 – 10.131.41.12110.131.41.121
6210.131.41.122/3110.131.41.122 – 10.131.41.12310.131.41.123
6310.131.41.124/3110.131.41.124 – 10.131.41.12510.131.41.125
6410.131.41.126/3110.131.41.126 – 10.131.41.12710.131.41.127
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 →