ip
ipku.in

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)10.78.152.0/25
network10.78.152.0/25
broadcast10.78.152.127
first host10.78.152.1
last host10.78.152.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.152.0/25
address00001010.01001110.10011000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.10011000.00000000
broadcast00001010.01001110.10011000.01111111
green = network part, grey = host part
hex0x0a4e9800
decimal172922880
reverse dns0.152.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:9800

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.152.0/3110.78.152.0 – 10.78.152.110.78.152.1
210.78.152.2/3110.78.152.2 – 10.78.152.310.78.152.3
310.78.152.4/3110.78.152.4 – 10.78.152.510.78.152.5
410.78.152.6/3110.78.152.6 – 10.78.152.710.78.152.7
510.78.152.8/3110.78.152.8 – 10.78.152.910.78.152.9
610.78.152.10/3110.78.152.10 – 10.78.152.1110.78.152.11
710.78.152.12/3110.78.152.12 – 10.78.152.1310.78.152.13
810.78.152.14/3110.78.152.14 – 10.78.152.1510.78.152.15
910.78.152.16/3110.78.152.16 – 10.78.152.1710.78.152.17
1010.78.152.18/3110.78.152.18 – 10.78.152.1910.78.152.19
1110.78.152.20/3110.78.152.20 – 10.78.152.2110.78.152.21
1210.78.152.22/3110.78.152.22 – 10.78.152.2310.78.152.23
1310.78.152.24/3110.78.152.24 – 10.78.152.2510.78.152.25
1410.78.152.26/3110.78.152.26 – 10.78.152.2710.78.152.27
1510.78.152.28/3110.78.152.28 – 10.78.152.2910.78.152.29
1610.78.152.30/3110.78.152.30 – 10.78.152.3110.78.152.31
1710.78.152.32/3110.78.152.32 – 10.78.152.3310.78.152.33
1810.78.152.34/3110.78.152.34 – 10.78.152.3510.78.152.35
1910.78.152.36/3110.78.152.36 – 10.78.152.3710.78.152.37
2010.78.152.38/3110.78.152.38 – 10.78.152.3910.78.152.39
2110.78.152.40/3110.78.152.40 – 10.78.152.4110.78.152.41
2210.78.152.42/3110.78.152.42 – 10.78.152.4310.78.152.43
2310.78.152.44/3110.78.152.44 – 10.78.152.4510.78.152.45
2410.78.152.46/3110.78.152.46 – 10.78.152.4710.78.152.47
2510.78.152.48/3110.78.152.48 – 10.78.152.4910.78.152.49
2610.78.152.50/3110.78.152.50 – 10.78.152.5110.78.152.51
2710.78.152.52/3110.78.152.52 – 10.78.152.5310.78.152.53
2810.78.152.54/3110.78.152.54 – 10.78.152.5510.78.152.55
2910.78.152.56/3110.78.152.56 – 10.78.152.5710.78.152.57
3010.78.152.58/3110.78.152.58 – 10.78.152.5910.78.152.59
3110.78.152.60/3110.78.152.60 – 10.78.152.6110.78.152.61
3210.78.152.62/3110.78.152.62 – 10.78.152.6310.78.152.63
3310.78.152.64/3110.78.152.64 – 10.78.152.6510.78.152.65
3410.78.152.66/3110.78.152.66 – 10.78.152.6710.78.152.67
3510.78.152.68/3110.78.152.68 – 10.78.152.6910.78.152.69
3610.78.152.70/3110.78.152.70 – 10.78.152.7110.78.152.71
3710.78.152.72/3110.78.152.72 – 10.78.152.7310.78.152.73
3810.78.152.74/3110.78.152.74 – 10.78.152.7510.78.152.75
3910.78.152.76/3110.78.152.76 – 10.78.152.7710.78.152.77
4010.78.152.78/3110.78.152.78 – 10.78.152.7910.78.152.79
4110.78.152.80/3110.78.152.80 – 10.78.152.8110.78.152.81
4210.78.152.82/3110.78.152.82 – 10.78.152.8310.78.152.83
4310.78.152.84/3110.78.152.84 – 10.78.152.8510.78.152.85
4410.78.152.86/3110.78.152.86 – 10.78.152.8710.78.152.87
4510.78.152.88/3110.78.152.88 – 10.78.152.8910.78.152.89
4610.78.152.90/3110.78.152.90 – 10.78.152.9110.78.152.91
4710.78.152.92/3110.78.152.92 – 10.78.152.9310.78.152.93
4810.78.152.94/3110.78.152.94 – 10.78.152.9510.78.152.95
4910.78.152.96/3110.78.152.96 – 10.78.152.9710.78.152.97
5010.78.152.98/3110.78.152.98 – 10.78.152.9910.78.152.99
5110.78.152.100/3110.78.152.100 – 10.78.152.10110.78.152.101
5210.78.152.102/3110.78.152.102 – 10.78.152.10310.78.152.103
5310.78.152.104/3110.78.152.104 – 10.78.152.10510.78.152.105
5410.78.152.106/3110.78.152.106 – 10.78.152.10710.78.152.107
5510.78.152.108/3110.78.152.108 – 10.78.152.10910.78.152.109
5610.78.152.110/3110.78.152.110 – 10.78.152.11110.78.152.111
5710.78.152.112/3110.78.152.112 – 10.78.152.11310.78.152.113
5810.78.152.114/3110.78.152.114 – 10.78.152.11510.78.152.115
5910.78.152.116/3110.78.152.116 – 10.78.152.11710.78.152.117
6010.78.152.118/3110.78.152.118 – 10.78.152.11910.78.152.119
6110.78.152.120/3110.78.152.120 – 10.78.152.12110.78.152.121
6210.78.152.122/3110.78.152.122 – 10.78.152.12310.78.152.123
6310.78.152.124/3110.78.152.124 – 10.78.152.12510.78.152.125
6410.78.152.126/3110.78.152.126 – 10.78.152.12710.78.152.127
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 →