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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)10.78.32.0/25
network10.78.32.0/25
broadcast10.78.32.127
first host10.78.32.1
last host10.78.32.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.32.0/25
address00001010.01001110.00100000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.00100000.00000000
broadcast00001010.01001110.00100000.01111111
green = network part, grey = host part
hex0x0a4e2000
decimal172892160
reverse dns0.32.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:2000

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.32.0/3110.78.32.0 – 10.78.32.110.78.32.1
210.78.32.2/3110.78.32.2 – 10.78.32.310.78.32.3
310.78.32.4/3110.78.32.4 – 10.78.32.510.78.32.5
410.78.32.6/3110.78.32.6 – 10.78.32.710.78.32.7
510.78.32.8/3110.78.32.8 – 10.78.32.910.78.32.9
610.78.32.10/3110.78.32.10 – 10.78.32.1110.78.32.11
710.78.32.12/3110.78.32.12 – 10.78.32.1310.78.32.13
810.78.32.14/3110.78.32.14 – 10.78.32.1510.78.32.15
910.78.32.16/3110.78.32.16 – 10.78.32.1710.78.32.17
1010.78.32.18/3110.78.32.18 – 10.78.32.1910.78.32.19
1110.78.32.20/3110.78.32.20 – 10.78.32.2110.78.32.21
1210.78.32.22/3110.78.32.22 – 10.78.32.2310.78.32.23
1310.78.32.24/3110.78.32.24 – 10.78.32.2510.78.32.25
1410.78.32.26/3110.78.32.26 – 10.78.32.2710.78.32.27
1510.78.32.28/3110.78.32.28 – 10.78.32.2910.78.32.29
1610.78.32.30/3110.78.32.30 – 10.78.32.3110.78.32.31
1710.78.32.32/3110.78.32.32 – 10.78.32.3310.78.32.33
1810.78.32.34/3110.78.32.34 – 10.78.32.3510.78.32.35
1910.78.32.36/3110.78.32.36 – 10.78.32.3710.78.32.37
2010.78.32.38/3110.78.32.38 – 10.78.32.3910.78.32.39
2110.78.32.40/3110.78.32.40 – 10.78.32.4110.78.32.41
2210.78.32.42/3110.78.32.42 – 10.78.32.4310.78.32.43
2310.78.32.44/3110.78.32.44 – 10.78.32.4510.78.32.45
2410.78.32.46/3110.78.32.46 – 10.78.32.4710.78.32.47
2510.78.32.48/3110.78.32.48 – 10.78.32.4910.78.32.49
2610.78.32.50/3110.78.32.50 – 10.78.32.5110.78.32.51
2710.78.32.52/3110.78.32.52 – 10.78.32.5310.78.32.53
2810.78.32.54/3110.78.32.54 – 10.78.32.5510.78.32.55
2910.78.32.56/3110.78.32.56 – 10.78.32.5710.78.32.57
3010.78.32.58/3110.78.32.58 – 10.78.32.5910.78.32.59
3110.78.32.60/3110.78.32.60 – 10.78.32.6110.78.32.61
3210.78.32.62/3110.78.32.62 – 10.78.32.6310.78.32.63
3310.78.32.64/3110.78.32.64 – 10.78.32.6510.78.32.65
3410.78.32.66/3110.78.32.66 – 10.78.32.6710.78.32.67
3510.78.32.68/3110.78.32.68 – 10.78.32.6910.78.32.69
3610.78.32.70/3110.78.32.70 – 10.78.32.7110.78.32.71
3710.78.32.72/3110.78.32.72 – 10.78.32.7310.78.32.73
3810.78.32.74/3110.78.32.74 – 10.78.32.7510.78.32.75
3910.78.32.76/3110.78.32.76 – 10.78.32.7710.78.32.77
4010.78.32.78/3110.78.32.78 – 10.78.32.7910.78.32.79
4110.78.32.80/3110.78.32.80 – 10.78.32.8110.78.32.81
4210.78.32.82/3110.78.32.82 – 10.78.32.8310.78.32.83
4310.78.32.84/3110.78.32.84 – 10.78.32.8510.78.32.85
4410.78.32.86/3110.78.32.86 – 10.78.32.8710.78.32.87
4510.78.32.88/3110.78.32.88 – 10.78.32.8910.78.32.89
4610.78.32.90/3110.78.32.90 – 10.78.32.9110.78.32.91
4710.78.32.92/3110.78.32.92 – 10.78.32.9310.78.32.93
4810.78.32.94/3110.78.32.94 – 10.78.32.9510.78.32.95
4910.78.32.96/3110.78.32.96 – 10.78.32.9710.78.32.97
5010.78.32.98/3110.78.32.98 – 10.78.32.9910.78.32.99
5110.78.32.100/3110.78.32.100 – 10.78.32.10110.78.32.101
5210.78.32.102/3110.78.32.102 – 10.78.32.10310.78.32.103
5310.78.32.104/3110.78.32.104 – 10.78.32.10510.78.32.105
5410.78.32.106/3110.78.32.106 – 10.78.32.10710.78.32.107
5510.78.32.108/3110.78.32.108 – 10.78.32.10910.78.32.109
5610.78.32.110/3110.78.32.110 – 10.78.32.11110.78.32.111
5710.78.32.112/3110.78.32.112 – 10.78.32.11310.78.32.113
5810.78.32.114/3110.78.32.114 – 10.78.32.11510.78.32.115
5910.78.32.116/3110.78.32.116 – 10.78.32.11710.78.32.117
6010.78.32.118/3110.78.32.118 – 10.78.32.11910.78.32.119
6110.78.32.120/3110.78.32.120 – 10.78.32.12110.78.32.121
6210.78.32.122/3110.78.32.122 – 10.78.32.12310.78.32.123
6310.78.32.124/3110.78.32.124 – 10.78.32.12510.78.32.125
6410.78.32.126/3110.78.32.126 – 10.78.32.12710.78.32.127
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 →