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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)10.3.19.0/25
network10.3.19.0/25
broadcast10.3.19.127
first host10.3.19.1
last host10.3.19.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.19.0/25
address00001010.00000011.00010011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.00010011.00000000
broadcast00001010.00000011.00010011.01111111
green = network part, grey = host part
hex0x0a031300
decimal167973632
reverse dns0.19.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:1300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.19.0/3110.3.19.0 – 10.3.19.110.3.19.1
210.3.19.2/3110.3.19.2 – 10.3.19.310.3.19.3
310.3.19.4/3110.3.19.4 – 10.3.19.510.3.19.5
410.3.19.6/3110.3.19.6 – 10.3.19.710.3.19.7
510.3.19.8/3110.3.19.8 – 10.3.19.910.3.19.9
610.3.19.10/3110.3.19.10 – 10.3.19.1110.3.19.11
710.3.19.12/3110.3.19.12 – 10.3.19.1310.3.19.13
810.3.19.14/3110.3.19.14 – 10.3.19.1510.3.19.15
910.3.19.16/3110.3.19.16 – 10.3.19.1710.3.19.17
1010.3.19.18/3110.3.19.18 – 10.3.19.1910.3.19.19
1110.3.19.20/3110.3.19.20 – 10.3.19.2110.3.19.21
1210.3.19.22/3110.3.19.22 – 10.3.19.2310.3.19.23
1310.3.19.24/3110.3.19.24 – 10.3.19.2510.3.19.25
1410.3.19.26/3110.3.19.26 – 10.3.19.2710.3.19.27
1510.3.19.28/3110.3.19.28 – 10.3.19.2910.3.19.29
1610.3.19.30/3110.3.19.30 – 10.3.19.3110.3.19.31
1710.3.19.32/3110.3.19.32 – 10.3.19.3310.3.19.33
1810.3.19.34/3110.3.19.34 – 10.3.19.3510.3.19.35
1910.3.19.36/3110.3.19.36 – 10.3.19.3710.3.19.37
2010.3.19.38/3110.3.19.38 – 10.3.19.3910.3.19.39
2110.3.19.40/3110.3.19.40 – 10.3.19.4110.3.19.41
2210.3.19.42/3110.3.19.42 – 10.3.19.4310.3.19.43
2310.3.19.44/3110.3.19.44 – 10.3.19.4510.3.19.45
2410.3.19.46/3110.3.19.46 – 10.3.19.4710.3.19.47
2510.3.19.48/3110.3.19.48 – 10.3.19.4910.3.19.49
2610.3.19.50/3110.3.19.50 – 10.3.19.5110.3.19.51
2710.3.19.52/3110.3.19.52 – 10.3.19.5310.3.19.53
2810.3.19.54/3110.3.19.54 – 10.3.19.5510.3.19.55
2910.3.19.56/3110.3.19.56 – 10.3.19.5710.3.19.57
3010.3.19.58/3110.3.19.58 – 10.3.19.5910.3.19.59
3110.3.19.60/3110.3.19.60 – 10.3.19.6110.3.19.61
3210.3.19.62/3110.3.19.62 – 10.3.19.6310.3.19.63
3310.3.19.64/3110.3.19.64 – 10.3.19.6510.3.19.65
3410.3.19.66/3110.3.19.66 – 10.3.19.6710.3.19.67
3510.3.19.68/3110.3.19.68 – 10.3.19.6910.3.19.69
3610.3.19.70/3110.3.19.70 – 10.3.19.7110.3.19.71
3710.3.19.72/3110.3.19.72 – 10.3.19.7310.3.19.73
3810.3.19.74/3110.3.19.74 – 10.3.19.7510.3.19.75
3910.3.19.76/3110.3.19.76 – 10.3.19.7710.3.19.77
4010.3.19.78/3110.3.19.78 – 10.3.19.7910.3.19.79
4110.3.19.80/3110.3.19.80 – 10.3.19.8110.3.19.81
4210.3.19.82/3110.3.19.82 – 10.3.19.8310.3.19.83
4310.3.19.84/3110.3.19.84 – 10.3.19.8510.3.19.85
4410.3.19.86/3110.3.19.86 – 10.3.19.8710.3.19.87
4510.3.19.88/3110.3.19.88 – 10.3.19.8910.3.19.89
4610.3.19.90/3110.3.19.90 – 10.3.19.9110.3.19.91
4710.3.19.92/3110.3.19.92 – 10.3.19.9310.3.19.93
4810.3.19.94/3110.3.19.94 – 10.3.19.9510.3.19.95
4910.3.19.96/3110.3.19.96 – 10.3.19.9710.3.19.97
5010.3.19.98/3110.3.19.98 – 10.3.19.9910.3.19.99
5110.3.19.100/3110.3.19.100 – 10.3.19.10110.3.19.101
5210.3.19.102/3110.3.19.102 – 10.3.19.10310.3.19.103
5310.3.19.104/3110.3.19.104 – 10.3.19.10510.3.19.105
5410.3.19.106/3110.3.19.106 – 10.3.19.10710.3.19.107
5510.3.19.108/3110.3.19.108 – 10.3.19.10910.3.19.109
5610.3.19.110/3110.3.19.110 – 10.3.19.11110.3.19.111
5710.3.19.112/3110.3.19.112 – 10.3.19.11310.3.19.113
5810.3.19.114/3110.3.19.114 – 10.3.19.11510.3.19.115
5910.3.19.116/3110.3.19.116 – 10.3.19.11710.3.19.117
6010.3.19.118/3110.3.19.118 – 10.3.19.11910.3.19.119
6110.3.19.120/3110.3.19.120 – 10.3.19.12110.3.19.121
6210.3.19.122/3110.3.19.122 – 10.3.19.12310.3.19.123
6310.3.19.124/3110.3.19.124 – 10.3.19.12510.3.19.125
6410.3.19.126/3110.3.19.126 – 10.3.19.12710.3.19.127
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 →