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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)10.3.30.0/23
network10.3.30.0/23
broadcast10.3.31.255
first host10.3.30.1
last host10.3.31.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.30.0/23
address00001010.00000011.00011110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.00011110.00000000
broadcast00001010.00000011.00011111.11111111
green = network part, grey = host part
hex0x0a031e00
decimal167976448
reverse dns0.30.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:1e00

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.30.0/2810.3.30.1 – 10.3.30.1410.3.30.15
210.3.30.16/2810.3.30.17 – 10.3.30.3010.3.30.31
310.3.30.32/2810.3.30.33 – 10.3.30.4610.3.30.47
410.3.30.48/2810.3.30.49 – 10.3.30.6210.3.30.63
510.3.30.64/2810.3.30.65 – 10.3.30.7810.3.30.79
610.3.30.80/2810.3.30.81 – 10.3.30.9410.3.30.95
710.3.30.96/2810.3.30.97 – 10.3.30.11010.3.30.111
810.3.30.112/2810.3.30.113 – 10.3.30.12610.3.30.127
910.3.30.128/2810.3.30.129 – 10.3.30.14210.3.30.143
1010.3.30.144/2810.3.30.145 – 10.3.30.15810.3.30.159
1110.3.30.160/2810.3.30.161 – 10.3.30.17410.3.30.175
1210.3.30.176/2810.3.30.177 – 10.3.30.19010.3.30.191
1310.3.30.192/2810.3.30.193 – 10.3.30.20610.3.30.207
1410.3.30.208/2810.3.30.209 – 10.3.30.22210.3.30.223
1510.3.30.224/2810.3.30.225 – 10.3.30.23810.3.30.239
1610.3.30.240/2810.3.30.241 – 10.3.30.25410.3.30.255
1710.3.31.0/2810.3.31.1 – 10.3.31.1410.3.31.15
1810.3.31.16/2810.3.31.17 – 10.3.31.3010.3.31.31
1910.3.31.32/2810.3.31.33 – 10.3.31.4610.3.31.47
2010.3.31.48/2810.3.31.49 – 10.3.31.6210.3.31.63
2110.3.31.64/2810.3.31.65 – 10.3.31.7810.3.31.79
2210.3.31.80/2810.3.31.81 – 10.3.31.9410.3.31.95
2310.3.31.96/2810.3.31.97 – 10.3.31.11010.3.31.111
2410.3.31.112/2810.3.31.113 – 10.3.31.12610.3.31.127
2510.3.31.128/2810.3.31.129 – 10.3.31.14210.3.31.143
2610.3.31.144/2810.3.31.145 – 10.3.31.15810.3.31.159
2710.3.31.160/2810.3.31.161 – 10.3.31.17410.3.31.175
2810.3.31.176/2810.3.31.177 – 10.3.31.19010.3.31.191
2910.3.31.192/2810.3.31.193 – 10.3.31.20610.3.31.207
3010.3.31.208/2810.3.31.209 – 10.3.31.22210.3.31.223
3110.3.31.224/2810.3.31.225 – 10.3.31.23810.3.31.239
3210.3.31.240/2810.3.31.241 – 10.3.31.25410.3.31.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →