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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)10.30.0.0/25
network10.30.0.0/25
broadcast10.30.0.127
first host10.30.0.1
last host10.30.0.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.30.0.0/25
address00001010.00011110.00000000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00011110.00000000.00000000
broadcast00001010.00011110.00000000.01111111
green = network part, grey = host part
hex0x0a1e0000
decimal169738240
reverse dns0.0.30.10.in-addr.arpa
ipv4-mapped::ffff:a1e:0

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.30.0.0/3110.30.0.0 – 10.30.0.110.30.0.1
210.30.0.2/3110.30.0.2 – 10.30.0.310.30.0.3
310.30.0.4/3110.30.0.4 – 10.30.0.510.30.0.5
410.30.0.6/3110.30.0.6 – 10.30.0.710.30.0.7
510.30.0.8/3110.30.0.8 – 10.30.0.910.30.0.9
610.30.0.10/3110.30.0.10 – 10.30.0.1110.30.0.11
710.30.0.12/3110.30.0.12 – 10.30.0.1310.30.0.13
810.30.0.14/3110.30.0.14 – 10.30.0.1510.30.0.15
910.30.0.16/3110.30.0.16 – 10.30.0.1710.30.0.17
1010.30.0.18/3110.30.0.18 – 10.30.0.1910.30.0.19
1110.30.0.20/3110.30.0.20 – 10.30.0.2110.30.0.21
1210.30.0.22/3110.30.0.22 – 10.30.0.2310.30.0.23
1310.30.0.24/3110.30.0.24 – 10.30.0.2510.30.0.25
1410.30.0.26/3110.30.0.26 – 10.30.0.2710.30.0.27
1510.30.0.28/3110.30.0.28 – 10.30.0.2910.30.0.29
1610.30.0.30/3110.30.0.30 – 10.30.0.3110.30.0.31
1710.30.0.32/3110.30.0.32 – 10.30.0.3310.30.0.33
1810.30.0.34/3110.30.0.34 – 10.30.0.3510.30.0.35
1910.30.0.36/3110.30.0.36 – 10.30.0.3710.30.0.37
2010.30.0.38/3110.30.0.38 – 10.30.0.3910.30.0.39
2110.30.0.40/3110.30.0.40 – 10.30.0.4110.30.0.41
2210.30.0.42/3110.30.0.42 – 10.30.0.4310.30.0.43
2310.30.0.44/3110.30.0.44 – 10.30.0.4510.30.0.45
2410.30.0.46/3110.30.0.46 – 10.30.0.4710.30.0.47
2510.30.0.48/3110.30.0.48 – 10.30.0.4910.30.0.49
2610.30.0.50/3110.30.0.50 – 10.30.0.5110.30.0.51
2710.30.0.52/3110.30.0.52 – 10.30.0.5310.30.0.53
2810.30.0.54/3110.30.0.54 – 10.30.0.5510.30.0.55
2910.30.0.56/3110.30.0.56 – 10.30.0.5710.30.0.57
3010.30.0.58/3110.30.0.58 – 10.30.0.5910.30.0.59
3110.30.0.60/3110.30.0.60 – 10.30.0.6110.30.0.61
3210.30.0.62/3110.30.0.62 – 10.30.0.6310.30.0.63
3310.30.0.64/3110.30.0.64 – 10.30.0.6510.30.0.65
3410.30.0.66/3110.30.0.66 – 10.30.0.6710.30.0.67
3510.30.0.68/3110.30.0.68 – 10.30.0.6910.30.0.69
3610.30.0.70/3110.30.0.70 – 10.30.0.7110.30.0.71
3710.30.0.72/3110.30.0.72 – 10.30.0.7310.30.0.73
3810.30.0.74/3110.30.0.74 – 10.30.0.7510.30.0.75
3910.30.0.76/3110.30.0.76 – 10.30.0.7710.30.0.77
4010.30.0.78/3110.30.0.78 – 10.30.0.7910.30.0.79
4110.30.0.80/3110.30.0.80 – 10.30.0.8110.30.0.81
4210.30.0.82/3110.30.0.82 – 10.30.0.8310.30.0.83
4310.30.0.84/3110.30.0.84 – 10.30.0.8510.30.0.85
4410.30.0.86/3110.30.0.86 – 10.30.0.8710.30.0.87
4510.30.0.88/3110.30.0.88 – 10.30.0.8910.30.0.89
4610.30.0.90/3110.30.0.90 – 10.30.0.9110.30.0.91
4710.30.0.92/3110.30.0.92 – 10.30.0.9310.30.0.93
4810.30.0.94/3110.30.0.94 – 10.30.0.9510.30.0.95
4910.30.0.96/3110.30.0.96 – 10.30.0.9710.30.0.97
5010.30.0.98/3110.30.0.98 – 10.30.0.9910.30.0.99
5110.30.0.100/3110.30.0.100 – 10.30.0.10110.30.0.101
5210.30.0.102/3110.30.0.102 – 10.30.0.10310.30.0.103
5310.30.0.104/3110.30.0.104 – 10.30.0.10510.30.0.105
5410.30.0.106/3110.30.0.106 – 10.30.0.10710.30.0.107
5510.30.0.108/3110.30.0.108 – 10.30.0.10910.30.0.109
5610.30.0.110/3110.30.0.110 – 10.30.0.11110.30.0.111
5710.30.0.112/3110.30.0.112 – 10.30.0.11310.30.0.113
5810.30.0.114/3110.30.0.114 – 10.30.0.11510.30.0.115
5910.30.0.116/3110.30.0.116 – 10.30.0.11710.30.0.117
6010.30.0.118/3110.30.0.118 – 10.30.0.11910.30.0.119
6110.30.0.120/3110.30.0.120 – 10.30.0.12110.30.0.121
6210.30.0.122/3110.30.0.122 – 10.30.0.12310.30.0.123
6310.30.0.124/3110.30.0.124 – 10.30.0.12510.30.0.125
6410.30.0.126/3110.30.0.126 – 10.30.0.12710.30.0.127
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 →