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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)10.2.100.0/25
network10.2.100.0/25
broadcast10.2.100.127
first host10.2.100.1
last host10.2.100.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.100.0/25
address00001010.00000010.01100100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01100100.00000000
broadcast00001010.00000010.01100100.01111111
green = network part, grey = host part
hex0x0a026400
decimal167928832
reverse dns0.100.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:6400

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.100.0/3110.2.100.0 – 10.2.100.110.2.100.1
210.2.100.2/3110.2.100.2 – 10.2.100.310.2.100.3
310.2.100.4/3110.2.100.4 – 10.2.100.510.2.100.5
410.2.100.6/3110.2.100.6 – 10.2.100.710.2.100.7
510.2.100.8/3110.2.100.8 – 10.2.100.910.2.100.9
610.2.100.10/3110.2.100.10 – 10.2.100.1110.2.100.11
710.2.100.12/3110.2.100.12 – 10.2.100.1310.2.100.13
810.2.100.14/3110.2.100.14 – 10.2.100.1510.2.100.15
910.2.100.16/3110.2.100.16 – 10.2.100.1710.2.100.17
1010.2.100.18/3110.2.100.18 – 10.2.100.1910.2.100.19
1110.2.100.20/3110.2.100.20 – 10.2.100.2110.2.100.21
1210.2.100.22/3110.2.100.22 – 10.2.100.2310.2.100.23
1310.2.100.24/3110.2.100.24 – 10.2.100.2510.2.100.25
1410.2.100.26/3110.2.100.26 – 10.2.100.2710.2.100.27
1510.2.100.28/3110.2.100.28 – 10.2.100.2910.2.100.29
1610.2.100.30/3110.2.100.30 – 10.2.100.3110.2.100.31
1710.2.100.32/3110.2.100.32 – 10.2.100.3310.2.100.33
1810.2.100.34/3110.2.100.34 – 10.2.100.3510.2.100.35
1910.2.100.36/3110.2.100.36 – 10.2.100.3710.2.100.37
2010.2.100.38/3110.2.100.38 – 10.2.100.3910.2.100.39
2110.2.100.40/3110.2.100.40 – 10.2.100.4110.2.100.41
2210.2.100.42/3110.2.100.42 – 10.2.100.4310.2.100.43
2310.2.100.44/3110.2.100.44 – 10.2.100.4510.2.100.45
2410.2.100.46/3110.2.100.46 – 10.2.100.4710.2.100.47
2510.2.100.48/3110.2.100.48 – 10.2.100.4910.2.100.49
2610.2.100.50/3110.2.100.50 – 10.2.100.5110.2.100.51
2710.2.100.52/3110.2.100.52 – 10.2.100.5310.2.100.53
2810.2.100.54/3110.2.100.54 – 10.2.100.5510.2.100.55
2910.2.100.56/3110.2.100.56 – 10.2.100.5710.2.100.57
3010.2.100.58/3110.2.100.58 – 10.2.100.5910.2.100.59
3110.2.100.60/3110.2.100.60 – 10.2.100.6110.2.100.61
3210.2.100.62/3110.2.100.62 – 10.2.100.6310.2.100.63
3310.2.100.64/3110.2.100.64 – 10.2.100.6510.2.100.65
3410.2.100.66/3110.2.100.66 – 10.2.100.6710.2.100.67
3510.2.100.68/3110.2.100.68 – 10.2.100.6910.2.100.69
3610.2.100.70/3110.2.100.70 – 10.2.100.7110.2.100.71
3710.2.100.72/3110.2.100.72 – 10.2.100.7310.2.100.73
3810.2.100.74/3110.2.100.74 – 10.2.100.7510.2.100.75
3910.2.100.76/3110.2.100.76 – 10.2.100.7710.2.100.77
4010.2.100.78/3110.2.100.78 – 10.2.100.7910.2.100.79
4110.2.100.80/3110.2.100.80 – 10.2.100.8110.2.100.81
4210.2.100.82/3110.2.100.82 – 10.2.100.8310.2.100.83
4310.2.100.84/3110.2.100.84 – 10.2.100.8510.2.100.85
4410.2.100.86/3110.2.100.86 – 10.2.100.8710.2.100.87
4510.2.100.88/3110.2.100.88 – 10.2.100.8910.2.100.89
4610.2.100.90/3110.2.100.90 – 10.2.100.9110.2.100.91
4710.2.100.92/3110.2.100.92 – 10.2.100.9310.2.100.93
4810.2.100.94/3110.2.100.94 – 10.2.100.9510.2.100.95
4910.2.100.96/3110.2.100.96 – 10.2.100.9710.2.100.97
5010.2.100.98/3110.2.100.98 – 10.2.100.9910.2.100.99
5110.2.100.100/3110.2.100.100 – 10.2.100.10110.2.100.101
5210.2.100.102/3110.2.100.102 – 10.2.100.10310.2.100.103
5310.2.100.104/3110.2.100.104 – 10.2.100.10510.2.100.105
5410.2.100.106/3110.2.100.106 – 10.2.100.10710.2.100.107
5510.2.100.108/3110.2.100.108 – 10.2.100.10910.2.100.109
5610.2.100.110/3110.2.100.110 – 10.2.100.11110.2.100.111
5710.2.100.112/3110.2.100.112 – 10.2.100.11310.2.100.113
5810.2.100.114/3110.2.100.114 – 10.2.100.11510.2.100.115
5910.2.100.116/3110.2.100.116 – 10.2.100.11710.2.100.117
6010.2.100.118/3110.2.100.118 – 10.2.100.11910.2.100.119
6110.2.100.120/3110.2.100.120 – 10.2.100.12110.2.100.121
6210.2.100.122/3110.2.100.122 – 10.2.100.12310.2.100.123
6310.2.100.124/3110.2.100.124 – 10.2.100.12510.2.100.125
6410.2.100.126/3110.2.100.126 – 10.2.100.12710.2.100.127
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 →