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)10.151.80.0/25
network10.151.80.0/25
broadcast10.151.80.127
first host10.151.80.1
last host10.151.80.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.151.80.0/25
address00001010.10010111.01010000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10010111.01010000.00000000
broadcast00001010.10010111.01010000.01111111
green = network part, grey = host part
hex0x0a975000
decimal177688576
reverse dns0.80.151.10.in-addr.arpa
ipv4-mapped::ffff:a97:5000

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.151.80.0/3010.151.80.1 – 10.151.80.210.151.80.3
210.151.80.4/3010.151.80.5 – 10.151.80.610.151.80.7
310.151.80.8/3010.151.80.9 – 10.151.80.1010.151.80.11
410.151.80.12/3010.151.80.13 – 10.151.80.1410.151.80.15
510.151.80.16/3010.151.80.17 – 10.151.80.1810.151.80.19
610.151.80.20/3010.151.80.21 – 10.151.80.2210.151.80.23
710.151.80.24/3010.151.80.25 – 10.151.80.2610.151.80.27
810.151.80.28/3010.151.80.29 – 10.151.80.3010.151.80.31
910.151.80.32/3010.151.80.33 – 10.151.80.3410.151.80.35
1010.151.80.36/3010.151.80.37 – 10.151.80.3810.151.80.39
1110.151.80.40/3010.151.80.41 – 10.151.80.4210.151.80.43
1210.151.80.44/3010.151.80.45 – 10.151.80.4610.151.80.47
1310.151.80.48/3010.151.80.49 – 10.151.80.5010.151.80.51
1410.151.80.52/3010.151.80.53 – 10.151.80.5410.151.80.55
1510.151.80.56/3010.151.80.57 – 10.151.80.5810.151.80.59
1610.151.80.60/3010.151.80.61 – 10.151.80.6210.151.80.63
1710.151.80.64/3010.151.80.65 – 10.151.80.6610.151.80.67
1810.151.80.68/3010.151.80.69 – 10.151.80.7010.151.80.71
1910.151.80.72/3010.151.80.73 – 10.151.80.7410.151.80.75
2010.151.80.76/3010.151.80.77 – 10.151.80.7810.151.80.79
2110.151.80.80/3010.151.80.81 – 10.151.80.8210.151.80.83
2210.151.80.84/3010.151.80.85 – 10.151.80.8610.151.80.87
2310.151.80.88/3010.151.80.89 – 10.151.80.9010.151.80.91
2410.151.80.92/3010.151.80.93 – 10.151.80.9410.151.80.95
2510.151.80.96/3010.151.80.97 – 10.151.80.9810.151.80.99
2610.151.80.100/3010.151.80.101 – 10.151.80.10210.151.80.103
2710.151.80.104/3010.151.80.105 – 10.151.80.10610.151.80.107
2810.151.80.108/3010.151.80.109 – 10.151.80.11010.151.80.111
2910.151.80.112/3010.151.80.113 – 10.151.80.11410.151.80.115
3010.151.80.116/3010.151.80.117 – 10.151.80.11810.151.80.119
3110.151.80.120/3010.151.80.121 – 10.151.80.12210.151.80.123
3210.151.80.124/3010.151.80.125 – 10.151.80.12610.151.80.127
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 →