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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)10.3.111.0/25
network10.3.111.0/25
broadcast10.3.111.127
first host10.3.111.1
last host10.3.111.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.111.0/25
address00001010.00000011.01101111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.01101111.00000000
broadcast00001010.00000011.01101111.01111111
green = network part, grey = host part
hex0x0a036f00
decimal167997184
reverse dns0.111.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:6f00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.111.0/3110.3.111.0 – 10.3.111.110.3.111.1
210.3.111.2/3110.3.111.2 – 10.3.111.310.3.111.3
310.3.111.4/3110.3.111.4 – 10.3.111.510.3.111.5
410.3.111.6/3110.3.111.6 – 10.3.111.710.3.111.7
510.3.111.8/3110.3.111.8 – 10.3.111.910.3.111.9
610.3.111.10/3110.3.111.10 – 10.3.111.1110.3.111.11
710.3.111.12/3110.3.111.12 – 10.3.111.1310.3.111.13
810.3.111.14/3110.3.111.14 – 10.3.111.1510.3.111.15
910.3.111.16/3110.3.111.16 – 10.3.111.1710.3.111.17
1010.3.111.18/3110.3.111.18 – 10.3.111.1910.3.111.19
1110.3.111.20/3110.3.111.20 – 10.3.111.2110.3.111.21
1210.3.111.22/3110.3.111.22 – 10.3.111.2310.3.111.23
1310.3.111.24/3110.3.111.24 – 10.3.111.2510.3.111.25
1410.3.111.26/3110.3.111.26 – 10.3.111.2710.3.111.27
1510.3.111.28/3110.3.111.28 – 10.3.111.2910.3.111.29
1610.3.111.30/3110.3.111.30 – 10.3.111.3110.3.111.31
1710.3.111.32/3110.3.111.32 – 10.3.111.3310.3.111.33
1810.3.111.34/3110.3.111.34 – 10.3.111.3510.3.111.35
1910.3.111.36/3110.3.111.36 – 10.3.111.3710.3.111.37
2010.3.111.38/3110.3.111.38 – 10.3.111.3910.3.111.39
2110.3.111.40/3110.3.111.40 – 10.3.111.4110.3.111.41
2210.3.111.42/3110.3.111.42 – 10.3.111.4310.3.111.43
2310.3.111.44/3110.3.111.44 – 10.3.111.4510.3.111.45
2410.3.111.46/3110.3.111.46 – 10.3.111.4710.3.111.47
2510.3.111.48/3110.3.111.48 – 10.3.111.4910.3.111.49
2610.3.111.50/3110.3.111.50 – 10.3.111.5110.3.111.51
2710.3.111.52/3110.3.111.52 – 10.3.111.5310.3.111.53
2810.3.111.54/3110.3.111.54 – 10.3.111.5510.3.111.55
2910.3.111.56/3110.3.111.56 – 10.3.111.5710.3.111.57
3010.3.111.58/3110.3.111.58 – 10.3.111.5910.3.111.59
3110.3.111.60/3110.3.111.60 – 10.3.111.6110.3.111.61
3210.3.111.62/3110.3.111.62 – 10.3.111.6310.3.111.63
3310.3.111.64/3110.3.111.64 – 10.3.111.6510.3.111.65
3410.3.111.66/3110.3.111.66 – 10.3.111.6710.3.111.67
3510.3.111.68/3110.3.111.68 – 10.3.111.6910.3.111.69
3610.3.111.70/3110.3.111.70 – 10.3.111.7110.3.111.71
3710.3.111.72/3110.3.111.72 – 10.3.111.7310.3.111.73
3810.3.111.74/3110.3.111.74 – 10.3.111.7510.3.111.75
3910.3.111.76/3110.3.111.76 – 10.3.111.7710.3.111.77
4010.3.111.78/3110.3.111.78 – 10.3.111.7910.3.111.79
4110.3.111.80/3110.3.111.80 – 10.3.111.8110.3.111.81
4210.3.111.82/3110.3.111.82 – 10.3.111.8310.3.111.83
4310.3.111.84/3110.3.111.84 – 10.3.111.8510.3.111.85
4410.3.111.86/3110.3.111.86 – 10.3.111.8710.3.111.87
4510.3.111.88/3110.3.111.88 – 10.3.111.8910.3.111.89
4610.3.111.90/3110.3.111.90 – 10.3.111.9110.3.111.91
4710.3.111.92/3110.3.111.92 – 10.3.111.9310.3.111.93
4810.3.111.94/3110.3.111.94 – 10.3.111.9510.3.111.95
4910.3.111.96/3110.3.111.96 – 10.3.111.9710.3.111.97
5010.3.111.98/3110.3.111.98 – 10.3.111.9910.3.111.99
5110.3.111.100/3110.3.111.100 – 10.3.111.10110.3.111.101
5210.3.111.102/3110.3.111.102 – 10.3.111.10310.3.111.103
5310.3.111.104/3110.3.111.104 – 10.3.111.10510.3.111.105
5410.3.111.106/3110.3.111.106 – 10.3.111.10710.3.111.107
5510.3.111.108/3110.3.111.108 – 10.3.111.10910.3.111.109
5610.3.111.110/3110.3.111.110 – 10.3.111.11110.3.111.111
5710.3.111.112/3110.3.111.112 – 10.3.111.11310.3.111.113
5810.3.111.114/3110.3.111.114 – 10.3.111.11510.3.111.115
5910.3.111.116/3110.3.111.116 – 10.3.111.11710.3.111.117
6010.3.111.118/3110.3.111.118 – 10.3.111.11910.3.111.119
6110.3.111.120/3110.3.111.120 – 10.3.111.12110.3.111.121
6210.3.111.122/3110.3.111.122 – 10.3.111.12310.3.111.123
6310.3.111.124/3110.3.111.124 – 10.3.111.12510.3.111.125
6410.3.111.126/3110.3.111.126 – 10.3.111.12710.3.111.127
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 →