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)10.7.74.0/23
network10.7.74.0/23
broadcast10.7.75.255
first host10.7.74.1
last host10.7.75.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.7.74.0/23
address00001010.00000111.01001010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000111.01001010.00000000
broadcast00001010.00000111.01001011.11111111
green = network part, grey = host part
hex0x0a074a00
decimal168249856
reverse dns0.74.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:4a00

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.7.74.0/2810.7.74.1 – 10.7.74.1410.7.74.15
210.7.74.16/2810.7.74.17 – 10.7.74.3010.7.74.31
310.7.74.32/2810.7.74.33 – 10.7.74.4610.7.74.47
410.7.74.48/2810.7.74.49 – 10.7.74.6210.7.74.63
510.7.74.64/2810.7.74.65 – 10.7.74.7810.7.74.79
610.7.74.80/2810.7.74.81 – 10.7.74.9410.7.74.95
710.7.74.96/2810.7.74.97 – 10.7.74.11010.7.74.111
810.7.74.112/2810.7.74.113 – 10.7.74.12610.7.74.127
910.7.74.128/2810.7.74.129 – 10.7.74.14210.7.74.143
1010.7.74.144/2810.7.74.145 – 10.7.74.15810.7.74.159
1110.7.74.160/2810.7.74.161 – 10.7.74.17410.7.74.175
1210.7.74.176/2810.7.74.177 – 10.7.74.19010.7.74.191
1310.7.74.192/2810.7.74.193 – 10.7.74.20610.7.74.207
1410.7.74.208/2810.7.74.209 – 10.7.74.22210.7.74.223
1510.7.74.224/2810.7.74.225 – 10.7.74.23810.7.74.239
1610.7.74.240/2810.7.74.241 – 10.7.74.25410.7.74.255
1710.7.75.0/2810.7.75.1 – 10.7.75.1410.7.75.15
1810.7.75.16/2810.7.75.17 – 10.7.75.3010.7.75.31
1910.7.75.32/2810.7.75.33 – 10.7.75.4610.7.75.47
2010.7.75.48/2810.7.75.49 – 10.7.75.6210.7.75.63
2110.7.75.64/2810.7.75.65 – 10.7.75.7810.7.75.79
2210.7.75.80/2810.7.75.81 – 10.7.75.9410.7.75.95
2310.7.75.96/2810.7.75.97 – 10.7.75.11010.7.75.111
2410.7.75.112/2810.7.75.113 – 10.7.75.12610.7.75.127
2510.7.75.128/2810.7.75.129 – 10.7.75.14210.7.75.143
2610.7.75.144/2810.7.75.145 – 10.7.75.15810.7.75.159
2710.7.75.160/2810.7.75.161 – 10.7.75.17410.7.75.175
2810.7.75.176/2810.7.75.177 – 10.7.75.19010.7.75.191
2910.7.75.192/2810.7.75.193 – 10.7.75.20610.7.75.207
3010.7.75.208/2810.7.75.209 – 10.7.75.22210.7.75.223
3110.7.75.224/2810.7.75.225 – 10.7.75.23810.7.75.239
3210.7.75.240/2810.7.75.241 – 10.7.75.25410.7.75.255
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 →