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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)10.44.78.0/25
network10.44.78.0/25
broadcast10.44.78.127
first host10.44.78.1
last host10.44.78.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.44.78.0/25
address00001010.00101100.01001110.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00101100.01001110.00000000
broadcast00001010.00101100.01001110.01111111
green = network part, grey = host part
hex0x0a2c4e00
decimal170675712
reverse dns0.78.44.10.in-addr.arpa
ipv4-mapped::ffff:a2c:4e00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.44.78.0/3110.44.78.0 – 10.44.78.110.44.78.1
210.44.78.2/3110.44.78.2 – 10.44.78.310.44.78.3
310.44.78.4/3110.44.78.4 – 10.44.78.510.44.78.5
410.44.78.6/3110.44.78.6 – 10.44.78.710.44.78.7
510.44.78.8/3110.44.78.8 – 10.44.78.910.44.78.9
610.44.78.10/3110.44.78.10 – 10.44.78.1110.44.78.11
710.44.78.12/3110.44.78.12 – 10.44.78.1310.44.78.13
810.44.78.14/3110.44.78.14 – 10.44.78.1510.44.78.15
910.44.78.16/3110.44.78.16 – 10.44.78.1710.44.78.17
1010.44.78.18/3110.44.78.18 – 10.44.78.1910.44.78.19
1110.44.78.20/3110.44.78.20 – 10.44.78.2110.44.78.21
1210.44.78.22/3110.44.78.22 – 10.44.78.2310.44.78.23
1310.44.78.24/3110.44.78.24 – 10.44.78.2510.44.78.25
1410.44.78.26/3110.44.78.26 – 10.44.78.2710.44.78.27
1510.44.78.28/3110.44.78.28 – 10.44.78.2910.44.78.29
1610.44.78.30/3110.44.78.30 – 10.44.78.3110.44.78.31
1710.44.78.32/3110.44.78.32 – 10.44.78.3310.44.78.33
1810.44.78.34/3110.44.78.34 – 10.44.78.3510.44.78.35
1910.44.78.36/3110.44.78.36 – 10.44.78.3710.44.78.37
2010.44.78.38/3110.44.78.38 – 10.44.78.3910.44.78.39
2110.44.78.40/3110.44.78.40 – 10.44.78.4110.44.78.41
2210.44.78.42/3110.44.78.42 – 10.44.78.4310.44.78.43
2310.44.78.44/3110.44.78.44 – 10.44.78.4510.44.78.45
2410.44.78.46/3110.44.78.46 – 10.44.78.4710.44.78.47
2510.44.78.48/3110.44.78.48 – 10.44.78.4910.44.78.49
2610.44.78.50/3110.44.78.50 – 10.44.78.5110.44.78.51
2710.44.78.52/3110.44.78.52 – 10.44.78.5310.44.78.53
2810.44.78.54/3110.44.78.54 – 10.44.78.5510.44.78.55
2910.44.78.56/3110.44.78.56 – 10.44.78.5710.44.78.57
3010.44.78.58/3110.44.78.58 – 10.44.78.5910.44.78.59
3110.44.78.60/3110.44.78.60 – 10.44.78.6110.44.78.61
3210.44.78.62/3110.44.78.62 – 10.44.78.6310.44.78.63
3310.44.78.64/3110.44.78.64 – 10.44.78.6510.44.78.65
3410.44.78.66/3110.44.78.66 – 10.44.78.6710.44.78.67
3510.44.78.68/3110.44.78.68 – 10.44.78.6910.44.78.69
3610.44.78.70/3110.44.78.70 – 10.44.78.7110.44.78.71
3710.44.78.72/3110.44.78.72 – 10.44.78.7310.44.78.73
3810.44.78.74/3110.44.78.74 – 10.44.78.7510.44.78.75
3910.44.78.76/3110.44.78.76 – 10.44.78.7710.44.78.77
4010.44.78.78/3110.44.78.78 – 10.44.78.7910.44.78.79
4110.44.78.80/3110.44.78.80 – 10.44.78.8110.44.78.81
4210.44.78.82/3110.44.78.82 – 10.44.78.8310.44.78.83
4310.44.78.84/3110.44.78.84 – 10.44.78.8510.44.78.85
4410.44.78.86/3110.44.78.86 – 10.44.78.8710.44.78.87
4510.44.78.88/3110.44.78.88 – 10.44.78.8910.44.78.89
4610.44.78.90/3110.44.78.90 – 10.44.78.9110.44.78.91
4710.44.78.92/3110.44.78.92 – 10.44.78.9310.44.78.93
4810.44.78.94/3110.44.78.94 – 10.44.78.9510.44.78.95
4910.44.78.96/3110.44.78.96 – 10.44.78.9710.44.78.97
5010.44.78.98/3110.44.78.98 – 10.44.78.9910.44.78.99
5110.44.78.100/3110.44.78.100 – 10.44.78.10110.44.78.101
5210.44.78.102/3110.44.78.102 – 10.44.78.10310.44.78.103
5310.44.78.104/3110.44.78.104 – 10.44.78.10510.44.78.105
5410.44.78.106/3110.44.78.106 – 10.44.78.10710.44.78.107
5510.44.78.108/3110.44.78.108 – 10.44.78.10910.44.78.109
5610.44.78.110/3110.44.78.110 – 10.44.78.11110.44.78.111
5710.44.78.112/3110.44.78.112 – 10.44.78.11310.44.78.113
5810.44.78.114/3110.44.78.114 – 10.44.78.11510.44.78.115
5910.44.78.116/3110.44.78.116 – 10.44.78.11710.44.78.117
6010.44.78.118/3110.44.78.118 – 10.44.78.11910.44.78.119
6110.44.78.120/3110.44.78.120 – 10.44.78.12110.44.78.121
6210.44.78.122/3110.44.78.122 – 10.44.78.12310.44.78.123
6310.44.78.124/3110.44.78.124 – 10.44.78.12510.44.78.125
6410.44.78.126/3110.44.78.126 – 10.44.78.12710.44.78.127
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 →