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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)10.2.255.0/26
network10.2.255.0/26
broadcast10.2.255.63
first host10.2.255.1
last host10.2.255.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.255.0/26
address00001010.00000010.11111111.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.11111111.00000000
broadcast00001010.00000010.11111111.00111111
green = network part, grey = host part
hex0x0a02ff00
decimal167968512
reverse dns0.255.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:ff00

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.255.0/3110.2.255.0 – 10.2.255.110.2.255.1
210.2.255.2/3110.2.255.2 – 10.2.255.310.2.255.3
310.2.255.4/3110.2.255.4 – 10.2.255.510.2.255.5
410.2.255.6/3110.2.255.6 – 10.2.255.710.2.255.7
510.2.255.8/3110.2.255.8 – 10.2.255.910.2.255.9
610.2.255.10/3110.2.255.10 – 10.2.255.1110.2.255.11
710.2.255.12/3110.2.255.12 – 10.2.255.1310.2.255.13
810.2.255.14/3110.2.255.14 – 10.2.255.1510.2.255.15
910.2.255.16/3110.2.255.16 – 10.2.255.1710.2.255.17
1010.2.255.18/3110.2.255.18 – 10.2.255.1910.2.255.19
1110.2.255.20/3110.2.255.20 – 10.2.255.2110.2.255.21
1210.2.255.22/3110.2.255.22 – 10.2.255.2310.2.255.23
1310.2.255.24/3110.2.255.24 – 10.2.255.2510.2.255.25
1410.2.255.26/3110.2.255.26 – 10.2.255.2710.2.255.27
1510.2.255.28/3110.2.255.28 – 10.2.255.2910.2.255.29
1610.2.255.30/3110.2.255.30 – 10.2.255.3110.2.255.31
1710.2.255.32/3110.2.255.32 – 10.2.255.3310.2.255.33
1810.2.255.34/3110.2.255.34 – 10.2.255.3510.2.255.35
1910.2.255.36/3110.2.255.36 – 10.2.255.3710.2.255.37
2010.2.255.38/3110.2.255.38 – 10.2.255.3910.2.255.39
2110.2.255.40/3110.2.255.40 – 10.2.255.4110.2.255.41
2210.2.255.42/3110.2.255.42 – 10.2.255.4310.2.255.43
2310.2.255.44/3110.2.255.44 – 10.2.255.4510.2.255.45
2410.2.255.46/3110.2.255.46 – 10.2.255.4710.2.255.47
2510.2.255.48/3110.2.255.48 – 10.2.255.4910.2.255.49
2610.2.255.50/3110.2.255.50 – 10.2.255.5110.2.255.51
2710.2.255.52/3110.2.255.52 – 10.2.255.5310.2.255.53
2810.2.255.54/3110.2.255.54 – 10.2.255.5510.2.255.55
2910.2.255.56/3110.2.255.56 – 10.2.255.5710.2.255.57
3010.2.255.58/3110.2.255.58 – 10.2.255.5910.2.255.59
3110.2.255.60/3110.2.255.60 – 10.2.255.6110.2.255.61
3210.2.255.62/3110.2.255.62 – 10.2.255.6310.2.255.63
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/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-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →