ip
ipku.in

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)10.65.70.0/23
network10.65.70.0/23
broadcast10.65.71.255
first host10.65.70.1
last host10.65.71.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.65.70.0/23
address00001010.01000001.01000110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000001.01000110.00000000
broadcast00001010.01000001.01000111.11111111
green = network part, grey = host part
hex0x0a414600
decimal172049920
reverse dns0.70.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:4600

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.65.70.0/2810.65.70.1 – 10.65.70.1410.65.70.15
210.65.70.16/2810.65.70.17 – 10.65.70.3010.65.70.31
310.65.70.32/2810.65.70.33 – 10.65.70.4610.65.70.47
410.65.70.48/2810.65.70.49 – 10.65.70.6210.65.70.63
510.65.70.64/2810.65.70.65 – 10.65.70.7810.65.70.79
610.65.70.80/2810.65.70.81 – 10.65.70.9410.65.70.95
710.65.70.96/2810.65.70.97 – 10.65.70.11010.65.70.111
810.65.70.112/2810.65.70.113 – 10.65.70.12610.65.70.127
910.65.70.128/2810.65.70.129 – 10.65.70.14210.65.70.143
1010.65.70.144/2810.65.70.145 – 10.65.70.15810.65.70.159
1110.65.70.160/2810.65.70.161 – 10.65.70.17410.65.70.175
1210.65.70.176/2810.65.70.177 – 10.65.70.19010.65.70.191
1310.65.70.192/2810.65.70.193 – 10.65.70.20610.65.70.207
1410.65.70.208/2810.65.70.209 – 10.65.70.22210.65.70.223
1510.65.70.224/2810.65.70.225 – 10.65.70.23810.65.70.239
1610.65.70.240/2810.65.70.241 – 10.65.70.25410.65.70.255
1710.65.71.0/2810.65.71.1 – 10.65.71.1410.65.71.15
1810.65.71.16/2810.65.71.17 – 10.65.71.3010.65.71.31
1910.65.71.32/2810.65.71.33 – 10.65.71.4610.65.71.47
2010.65.71.48/2810.65.71.49 – 10.65.71.6210.65.71.63
2110.65.71.64/2810.65.71.65 – 10.65.71.7810.65.71.79
2210.65.71.80/2810.65.71.81 – 10.65.71.9410.65.71.95
2310.65.71.96/2810.65.71.97 – 10.65.71.11010.65.71.111
2410.65.71.112/2810.65.71.113 – 10.65.71.12610.65.71.127
2510.65.71.128/2810.65.71.129 – 10.65.71.14210.65.71.143
2610.65.71.144/2810.65.71.145 – 10.65.71.15810.65.71.159
2710.65.71.160/2810.65.71.161 – 10.65.71.17410.65.71.175
2810.65.71.176/2810.65.71.177 – 10.65.71.19010.65.71.191
2910.65.71.192/2810.65.71.193 – 10.65.71.20610.65.71.207
3010.65.71.208/2810.65.71.209 – 10.65.71.22210.65.71.223
3110.65.71.224/2810.65.71.225 – 10.65.71.23810.65.71.239
3210.65.71.240/2810.65.71.241 – 10.65.71.25410.65.71.255
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 →