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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)10.2.165.0/26
network10.2.165.0/26
broadcast10.2.165.63
first host10.2.165.1
last host10.2.165.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.165.0/26
address00001010.00000010.10100101.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.10100101.00000000
broadcast00001010.00000010.10100101.00111111
green = network part, grey = host part
hex0x0a02a500
decimal167945472
reverse dns0.165.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:a500

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.165.0/3110.2.165.0 – 10.2.165.110.2.165.1
210.2.165.2/3110.2.165.2 – 10.2.165.310.2.165.3
310.2.165.4/3110.2.165.4 – 10.2.165.510.2.165.5
410.2.165.6/3110.2.165.6 – 10.2.165.710.2.165.7
510.2.165.8/3110.2.165.8 – 10.2.165.910.2.165.9
610.2.165.10/3110.2.165.10 – 10.2.165.1110.2.165.11
710.2.165.12/3110.2.165.12 – 10.2.165.1310.2.165.13
810.2.165.14/3110.2.165.14 – 10.2.165.1510.2.165.15
910.2.165.16/3110.2.165.16 – 10.2.165.1710.2.165.17
1010.2.165.18/3110.2.165.18 – 10.2.165.1910.2.165.19
1110.2.165.20/3110.2.165.20 – 10.2.165.2110.2.165.21
1210.2.165.22/3110.2.165.22 – 10.2.165.2310.2.165.23
1310.2.165.24/3110.2.165.24 – 10.2.165.2510.2.165.25
1410.2.165.26/3110.2.165.26 – 10.2.165.2710.2.165.27
1510.2.165.28/3110.2.165.28 – 10.2.165.2910.2.165.29
1610.2.165.30/3110.2.165.30 – 10.2.165.3110.2.165.31
1710.2.165.32/3110.2.165.32 – 10.2.165.3310.2.165.33
1810.2.165.34/3110.2.165.34 – 10.2.165.3510.2.165.35
1910.2.165.36/3110.2.165.36 – 10.2.165.3710.2.165.37
2010.2.165.38/3110.2.165.38 – 10.2.165.3910.2.165.39
2110.2.165.40/3110.2.165.40 – 10.2.165.4110.2.165.41
2210.2.165.42/3110.2.165.42 – 10.2.165.4310.2.165.43
2310.2.165.44/3110.2.165.44 – 10.2.165.4510.2.165.45
2410.2.165.46/3110.2.165.46 – 10.2.165.4710.2.165.47
2510.2.165.48/3110.2.165.48 – 10.2.165.4910.2.165.49
2610.2.165.50/3110.2.165.50 – 10.2.165.5110.2.165.51
2710.2.165.52/3110.2.165.52 – 10.2.165.5310.2.165.53
2810.2.165.54/3110.2.165.54 – 10.2.165.5510.2.165.55
2910.2.165.56/3110.2.165.56 – 10.2.165.5710.2.165.57
3010.2.165.58/3110.2.165.58 – 10.2.165.5910.2.165.59
3110.2.165.60/3110.2.165.60 – 10.2.165.6110.2.165.61
3210.2.165.62/3110.2.165.62 – 10.2.165.6310.2.165.63
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 →