ip
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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)10.72.78.0/25
network10.72.78.0/25
broadcast10.72.78.127
first host10.72.78.1
last host10.72.78.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.72.78.0/25
address00001010.01001000.01001110.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001000.01001110.00000000
broadcast00001010.01001000.01001110.01111111
green = network part, grey = host part
hex0x0a484e00
decimal172510720
reverse dns0.78.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4e00

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.72.78.0/3010.72.78.1 – 10.72.78.210.72.78.3
210.72.78.4/3010.72.78.5 – 10.72.78.610.72.78.7
310.72.78.8/3010.72.78.9 – 10.72.78.1010.72.78.11
410.72.78.12/3010.72.78.13 – 10.72.78.1410.72.78.15
510.72.78.16/3010.72.78.17 – 10.72.78.1810.72.78.19
610.72.78.20/3010.72.78.21 – 10.72.78.2210.72.78.23
710.72.78.24/3010.72.78.25 – 10.72.78.2610.72.78.27
810.72.78.28/3010.72.78.29 – 10.72.78.3010.72.78.31
910.72.78.32/3010.72.78.33 – 10.72.78.3410.72.78.35
1010.72.78.36/3010.72.78.37 – 10.72.78.3810.72.78.39
1110.72.78.40/3010.72.78.41 – 10.72.78.4210.72.78.43
1210.72.78.44/3010.72.78.45 – 10.72.78.4610.72.78.47
1310.72.78.48/3010.72.78.49 – 10.72.78.5010.72.78.51
1410.72.78.52/3010.72.78.53 – 10.72.78.5410.72.78.55
1510.72.78.56/3010.72.78.57 – 10.72.78.5810.72.78.59
1610.72.78.60/3010.72.78.61 – 10.72.78.6210.72.78.63
1710.72.78.64/3010.72.78.65 – 10.72.78.6610.72.78.67
1810.72.78.68/3010.72.78.69 – 10.72.78.7010.72.78.71
1910.72.78.72/3010.72.78.73 – 10.72.78.7410.72.78.75
2010.72.78.76/3010.72.78.77 – 10.72.78.7810.72.78.79
2110.72.78.80/3010.72.78.81 – 10.72.78.8210.72.78.83
2210.72.78.84/3010.72.78.85 – 10.72.78.8610.72.78.87
2310.72.78.88/3010.72.78.89 – 10.72.78.9010.72.78.91
2410.72.78.92/3010.72.78.93 – 10.72.78.9410.72.78.95
2510.72.78.96/3010.72.78.97 – 10.72.78.9810.72.78.99
2610.72.78.100/3010.72.78.101 – 10.72.78.10210.72.78.103
2710.72.78.104/3010.72.78.105 – 10.72.78.10610.72.78.107
2810.72.78.108/3010.72.78.109 – 10.72.78.11010.72.78.111
2910.72.78.112/3010.72.78.113 – 10.72.78.11410.72.78.115
3010.72.78.116/3010.72.78.117 – 10.72.78.11810.72.78.119
3110.72.78.120/3010.72.78.121 – 10.72.78.12210.72.78.123
3210.72.78.124/3010.72.78.125 – 10.72.78.12610.72.78.127
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 →