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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)10.3.55.0/25
network10.3.55.0/25
broadcast10.3.55.127
first host10.3.55.1
last host10.3.55.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.55.0/25
address00001010.00000011.00110111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.00110111.00000000
broadcast00001010.00000011.00110111.01111111
green = network part, grey = host part
hex0x0a033700
decimal167982848
reverse dns0.55.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:3700

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.55.0/3110.3.55.0 – 10.3.55.110.3.55.1
210.3.55.2/3110.3.55.2 – 10.3.55.310.3.55.3
310.3.55.4/3110.3.55.4 – 10.3.55.510.3.55.5
410.3.55.6/3110.3.55.6 – 10.3.55.710.3.55.7
510.3.55.8/3110.3.55.8 – 10.3.55.910.3.55.9
610.3.55.10/3110.3.55.10 – 10.3.55.1110.3.55.11
710.3.55.12/3110.3.55.12 – 10.3.55.1310.3.55.13
810.3.55.14/3110.3.55.14 – 10.3.55.1510.3.55.15
910.3.55.16/3110.3.55.16 – 10.3.55.1710.3.55.17
1010.3.55.18/3110.3.55.18 – 10.3.55.1910.3.55.19
1110.3.55.20/3110.3.55.20 – 10.3.55.2110.3.55.21
1210.3.55.22/3110.3.55.22 – 10.3.55.2310.3.55.23
1310.3.55.24/3110.3.55.24 – 10.3.55.2510.3.55.25
1410.3.55.26/3110.3.55.26 – 10.3.55.2710.3.55.27
1510.3.55.28/3110.3.55.28 – 10.3.55.2910.3.55.29
1610.3.55.30/3110.3.55.30 – 10.3.55.3110.3.55.31
1710.3.55.32/3110.3.55.32 – 10.3.55.3310.3.55.33
1810.3.55.34/3110.3.55.34 – 10.3.55.3510.3.55.35
1910.3.55.36/3110.3.55.36 – 10.3.55.3710.3.55.37
2010.3.55.38/3110.3.55.38 – 10.3.55.3910.3.55.39
2110.3.55.40/3110.3.55.40 – 10.3.55.4110.3.55.41
2210.3.55.42/3110.3.55.42 – 10.3.55.4310.3.55.43
2310.3.55.44/3110.3.55.44 – 10.3.55.4510.3.55.45
2410.3.55.46/3110.3.55.46 – 10.3.55.4710.3.55.47
2510.3.55.48/3110.3.55.48 – 10.3.55.4910.3.55.49
2610.3.55.50/3110.3.55.50 – 10.3.55.5110.3.55.51
2710.3.55.52/3110.3.55.52 – 10.3.55.5310.3.55.53
2810.3.55.54/3110.3.55.54 – 10.3.55.5510.3.55.55
2910.3.55.56/3110.3.55.56 – 10.3.55.5710.3.55.57
3010.3.55.58/3110.3.55.58 – 10.3.55.5910.3.55.59
3110.3.55.60/3110.3.55.60 – 10.3.55.6110.3.55.61
3210.3.55.62/3110.3.55.62 – 10.3.55.6310.3.55.63
3310.3.55.64/3110.3.55.64 – 10.3.55.6510.3.55.65
3410.3.55.66/3110.3.55.66 – 10.3.55.6710.3.55.67
3510.3.55.68/3110.3.55.68 – 10.3.55.6910.3.55.69
3610.3.55.70/3110.3.55.70 – 10.3.55.7110.3.55.71
3710.3.55.72/3110.3.55.72 – 10.3.55.7310.3.55.73
3810.3.55.74/3110.3.55.74 – 10.3.55.7510.3.55.75
3910.3.55.76/3110.3.55.76 – 10.3.55.7710.3.55.77
4010.3.55.78/3110.3.55.78 – 10.3.55.7910.3.55.79
4110.3.55.80/3110.3.55.80 – 10.3.55.8110.3.55.81
4210.3.55.82/3110.3.55.82 – 10.3.55.8310.3.55.83
4310.3.55.84/3110.3.55.84 – 10.3.55.8510.3.55.85
4410.3.55.86/3110.3.55.86 – 10.3.55.8710.3.55.87
4510.3.55.88/3110.3.55.88 – 10.3.55.8910.3.55.89
4610.3.55.90/3110.3.55.90 – 10.3.55.9110.3.55.91
4710.3.55.92/3110.3.55.92 – 10.3.55.9310.3.55.93
4810.3.55.94/3110.3.55.94 – 10.3.55.9510.3.55.95
4910.3.55.96/3110.3.55.96 – 10.3.55.9710.3.55.97
5010.3.55.98/3110.3.55.98 – 10.3.55.9910.3.55.99
5110.3.55.100/3110.3.55.100 – 10.3.55.10110.3.55.101
5210.3.55.102/3110.3.55.102 – 10.3.55.10310.3.55.103
5310.3.55.104/3110.3.55.104 – 10.3.55.10510.3.55.105
5410.3.55.106/3110.3.55.106 – 10.3.55.10710.3.55.107
5510.3.55.108/3110.3.55.108 – 10.3.55.10910.3.55.109
5610.3.55.110/3110.3.55.110 – 10.3.55.11110.3.55.111
5710.3.55.112/3110.3.55.112 – 10.3.55.11310.3.55.113
5810.3.55.114/3110.3.55.114 – 10.3.55.11510.3.55.115
5910.3.55.116/3110.3.55.116 – 10.3.55.11710.3.55.117
6010.3.55.118/3110.3.55.118 – 10.3.55.11910.3.55.119
6110.3.55.120/3110.3.55.120 – 10.3.55.12110.3.55.121
6210.3.55.122/3110.3.55.122 – 10.3.55.12310.3.55.123
6310.3.55.124/3110.3.55.124 – 10.3.55.12510.3.55.125
6410.3.55.126/3110.3.55.126 – 10.3.55.12710.3.55.127
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 →