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)10.131.43.0/25
network10.131.43.0/25
broadcast10.131.43.127
first host10.131.43.1
last host10.131.43.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.131.43.0/25
address00001010.10000011.00101011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10000011.00101011.00000000
broadcast00001010.10000011.00101011.01111111
green = network part, grey = host part
hex0x0a832b00
decimal176368384
reverse dns0.43.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:2b00

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.131.43.0/3010.131.43.1 – 10.131.43.210.131.43.3
210.131.43.4/3010.131.43.5 – 10.131.43.610.131.43.7
310.131.43.8/3010.131.43.9 – 10.131.43.1010.131.43.11
410.131.43.12/3010.131.43.13 – 10.131.43.1410.131.43.15
510.131.43.16/3010.131.43.17 – 10.131.43.1810.131.43.19
610.131.43.20/3010.131.43.21 – 10.131.43.2210.131.43.23
710.131.43.24/3010.131.43.25 – 10.131.43.2610.131.43.27
810.131.43.28/3010.131.43.29 – 10.131.43.3010.131.43.31
910.131.43.32/3010.131.43.33 – 10.131.43.3410.131.43.35
1010.131.43.36/3010.131.43.37 – 10.131.43.3810.131.43.39
1110.131.43.40/3010.131.43.41 – 10.131.43.4210.131.43.43
1210.131.43.44/3010.131.43.45 – 10.131.43.4610.131.43.47
1310.131.43.48/3010.131.43.49 – 10.131.43.5010.131.43.51
1410.131.43.52/3010.131.43.53 – 10.131.43.5410.131.43.55
1510.131.43.56/3010.131.43.57 – 10.131.43.5810.131.43.59
1610.131.43.60/3010.131.43.61 – 10.131.43.6210.131.43.63
1710.131.43.64/3010.131.43.65 – 10.131.43.6610.131.43.67
1810.131.43.68/3010.131.43.69 – 10.131.43.7010.131.43.71
1910.131.43.72/3010.131.43.73 – 10.131.43.7410.131.43.75
2010.131.43.76/3010.131.43.77 – 10.131.43.7810.131.43.79
2110.131.43.80/3010.131.43.81 – 10.131.43.8210.131.43.83
2210.131.43.84/3010.131.43.85 – 10.131.43.8610.131.43.87
2310.131.43.88/3010.131.43.89 – 10.131.43.9010.131.43.91
2410.131.43.92/3010.131.43.93 – 10.131.43.9410.131.43.95
2510.131.43.96/3010.131.43.97 – 10.131.43.9810.131.43.99
2610.131.43.100/3010.131.43.101 – 10.131.43.10210.131.43.103
2710.131.43.104/3010.131.43.105 – 10.131.43.10610.131.43.107
2810.131.43.108/3010.131.43.109 – 10.131.43.11010.131.43.111
2910.131.43.112/3010.131.43.113 – 10.131.43.11410.131.43.115
3010.131.43.116/3010.131.43.117 – 10.131.43.11810.131.43.119
3110.131.43.120/3010.131.43.121 – 10.131.43.12210.131.43.123
3210.131.43.124/3010.131.43.125 – 10.131.43.12610.131.43.127
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 →