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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)10.167.66.0/26
network10.167.66.0/26
broadcast10.167.66.63
first host10.167.66.1
last host10.167.66.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.66.0/26
address00001010.10100111.01000010.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.01000010.00000000
broadcast00001010.10100111.01000010.00111111
green = network part, grey = host part
hex0x0aa74200
decimal178733568
reverse dns0.66.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:4200

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.66.0/3110.167.66.0 – 10.167.66.110.167.66.1
210.167.66.2/3110.167.66.2 – 10.167.66.310.167.66.3
310.167.66.4/3110.167.66.4 – 10.167.66.510.167.66.5
410.167.66.6/3110.167.66.6 – 10.167.66.710.167.66.7
510.167.66.8/3110.167.66.8 – 10.167.66.910.167.66.9
610.167.66.10/3110.167.66.10 – 10.167.66.1110.167.66.11
710.167.66.12/3110.167.66.12 – 10.167.66.1310.167.66.13
810.167.66.14/3110.167.66.14 – 10.167.66.1510.167.66.15
910.167.66.16/3110.167.66.16 – 10.167.66.1710.167.66.17
1010.167.66.18/3110.167.66.18 – 10.167.66.1910.167.66.19
1110.167.66.20/3110.167.66.20 – 10.167.66.2110.167.66.21
1210.167.66.22/3110.167.66.22 – 10.167.66.2310.167.66.23
1310.167.66.24/3110.167.66.24 – 10.167.66.2510.167.66.25
1410.167.66.26/3110.167.66.26 – 10.167.66.2710.167.66.27
1510.167.66.28/3110.167.66.28 – 10.167.66.2910.167.66.29
1610.167.66.30/3110.167.66.30 – 10.167.66.3110.167.66.31
1710.167.66.32/3110.167.66.32 – 10.167.66.3310.167.66.33
1810.167.66.34/3110.167.66.34 – 10.167.66.3510.167.66.35
1910.167.66.36/3110.167.66.36 – 10.167.66.3710.167.66.37
2010.167.66.38/3110.167.66.38 – 10.167.66.3910.167.66.39
2110.167.66.40/3110.167.66.40 – 10.167.66.4110.167.66.41
2210.167.66.42/3110.167.66.42 – 10.167.66.4310.167.66.43
2310.167.66.44/3110.167.66.44 – 10.167.66.4510.167.66.45
2410.167.66.46/3110.167.66.46 – 10.167.66.4710.167.66.47
2510.167.66.48/3110.167.66.48 – 10.167.66.4910.167.66.49
2610.167.66.50/3110.167.66.50 – 10.167.66.5110.167.66.51
2710.167.66.52/3110.167.66.52 – 10.167.66.5310.167.66.53
2810.167.66.54/3110.167.66.54 – 10.167.66.5510.167.66.55
2910.167.66.56/3110.167.66.56 – 10.167.66.5710.167.66.57
3010.167.66.58/3110.167.66.58 – 10.167.66.5910.167.66.59
3110.167.66.60/3110.167.66.60 – 10.167.66.6110.167.66.61
3210.167.66.62/3110.167.66.62 – 10.167.66.6310.167.66.63
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 →