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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)10.78.243.0/25
network10.78.243.0/25
broadcast10.78.243.127
first host10.78.243.1
last host10.78.243.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.243.0/25
address00001010.01001110.11110011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.11110011.00000000
broadcast00001010.01001110.11110011.01111111
green = network part, grey = host part
hex0x0a4ef300
decimal172946176
reverse dns0.243.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:f300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.243.0/3110.78.243.0 – 10.78.243.110.78.243.1
210.78.243.2/3110.78.243.2 – 10.78.243.310.78.243.3
310.78.243.4/3110.78.243.4 – 10.78.243.510.78.243.5
410.78.243.6/3110.78.243.6 – 10.78.243.710.78.243.7
510.78.243.8/3110.78.243.8 – 10.78.243.910.78.243.9
610.78.243.10/3110.78.243.10 – 10.78.243.1110.78.243.11
710.78.243.12/3110.78.243.12 – 10.78.243.1310.78.243.13
810.78.243.14/3110.78.243.14 – 10.78.243.1510.78.243.15
910.78.243.16/3110.78.243.16 – 10.78.243.1710.78.243.17
1010.78.243.18/3110.78.243.18 – 10.78.243.1910.78.243.19
1110.78.243.20/3110.78.243.20 – 10.78.243.2110.78.243.21
1210.78.243.22/3110.78.243.22 – 10.78.243.2310.78.243.23
1310.78.243.24/3110.78.243.24 – 10.78.243.2510.78.243.25
1410.78.243.26/3110.78.243.26 – 10.78.243.2710.78.243.27
1510.78.243.28/3110.78.243.28 – 10.78.243.2910.78.243.29
1610.78.243.30/3110.78.243.30 – 10.78.243.3110.78.243.31
1710.78.243.32/3110.78.243.32 – 10.78.243.3310.78.243.33
1810.78.243.34/3110.78.243.34 – 10.78.243.3510.78.243.35
1910.78.243.36/3110.78.243.36 – 10.78.243.3710.78.243.37
2010.78.243.38/3110.78.243.38 – 10.78.243.3910.78.243.39
2110.78.243.40/3110.78.243.40 – 10.78.243.4110.78.243.41
2210.78.243.42/3110.78.243.42 – 10.78.243.4310.78.243.43
2310.78.243.44/3110.78.243.44 – 10.78.243.4510.78.243.45
2410.78.243.46/3110.78.243.46 – 10.78.243.4710.78.243.47
2510.78.243.48/3110.78.243.48 – 10.78.243.4910.78.243.49
2610.78.243.50/3110.78.243.50 – 10.78.243.5110.78.243.51
2710.78.243.52/3110.78.243.52 – 10.78.243.5310.78.243.53
2810.78.243.54/3110.78.243.54 – 10.78.243.5510.78.243.55
2910.78.243.56/3110.78.243.56 – 10.78.243.5710.78.243.57
3010.78.243.58/3110.78.243.58 – 10.78.243.5910.78.243.59
3110.78.243.60/3110.78.243.60 – 10.78.243.6110.78.243.61
3210.78.243.62/3110.78.243.62 – 10.78.243.6310.78.243.63
3310.78.243.64/3110.78.243.64 – 10.78.243.6510.78.243.65
3410.78.243.66/3110.78.243.66 – 10.78.243.6710.78.243.67
3510.78.243.68/3110.78.243.68 – 10.78.243.6910.78.243.69
3610.78.243.70/3110.78.243.70 – 10.78.243.7110.78.243.71
3710.78.243.72/3110.78.243.72 – 10.78.243.7310.78.243.73
3810.78.243.74/3110.78.243.74 – 10.78.243.7510.78.243.75
3910.78.243.76/3110.78.243.76 – 10.78.243.7710.78.243.77
4010.78.243.78/3110.78.243.78 – 10.78.243.7910.78.243.79
4110.78.243.80/3110.78.243.80 – 10.78.243.8110.78.243.81
4210.78.243.82/3110.78.243.82 – 10.78.243.8310.78.243.83
4310.78.243.84/3110.78.243.84 – 10.78.243.8510.78.243.85
4410.78.243.86/3110.78.243.86 – 10.78.243.8710.78.243.87
4510.78.243.88/3110.78.243.88 – 10.78.243.8910.78.243.89
4610.78.243.90/3110.78.243.90 – 10.78.243.9110.78.243.91
4710.78.243.92/3110.78.243.92 – 10.78.243.9310.78.243.93
4810.78.243.94/3110.78.243.94 – 10.78.243.9510.78.243.95
4910.78.243.96/3110.78.243.96 – 10.78.243.9710.78.243.97
5010.78.243.98/3110.78.243.98 – 10.78.243.9910.78.243.99
5110.78.243.100/3110.78.243.100 – 10.78.243.10110.78.243.101
5210.78.243.102/3110.78.243.102 – 10.78.243.10310.78.243.103
5310.78.243.104/3110.78.243.104 – 10.78.243.10510.78.243.105
5410.78.243.106/3110.78.243.106 – 10.78.243.10710.78.243.107
5510.78.243.108/3110.78.243.108 – 10.78.243.10910.78.243.109
5610.78.243.110/3110.78.243.110 – 10.78.243.11110.78.243.111
5710.78.243.112/3110.78.243.112 – 10.78.243.11310.78.243.113
5810.78.243.114/3110.78.243.114 – 10.78.243.11510.78.243.115
5910.78.243.116/3110.78.243.116 – 10.78.243.11710.78.243.117
6010.78.243.118/3110.78.243.118 – 10.78.243.11910.78.243.119
6110.78.243.120/3110.78.243.120 – 10.78.243.12110.78.243.121
6210.78.243.122/3110.78.243.122 – 10.78.243.12310.78.243.123
6310.78.243.124/3110.78.243.124 – 10.78.243.12510.78.243.125
6410.78.243.126/3110.78.243.126 – 10.78.243.12710.78.243.127
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 →