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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)10.35.64.0/18
network10.35.64.0/18
broadcast10.35.127.255
first host10.35.64.1
last host10.35.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.35.64.0/18
address00001010.00100011.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00100011.01000000.00000000
broadcast00001010.00100011.01111111.11111111
green = network part, grey = host part
hex0x0a234000
decimal170082304
reverse dns0.64.35.10.in-addr.arpa
ipv4-mapped::ffff:a23:4000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.35.64.0/2410.35.64.1 – 10.35.64.25410.35.64.255
210.35.65.0/2410.35.65.1 – 10.35.65.25410.35.65.255
310.35.66.0/2410.35.66.1 – 10.35.66.25410.35.66.255
410.35.67.0/2410.35.67.1 – 10.35.67.25410.35.67.255
510.35.68.0/2410.35.68.1 – 10.35.68.25410.35.68.255
610.35.69.0/2410.35.69.1 – 10.35.69.25410.35.69.255
710.35.70.0/2410.35.70.1 – 10.35.70.25410.35.70.255
810.35.71.0/2410.35.71.1 – 10.35.71.25410.35.71.255
910.35.72.0/2410.35.72.1 – 10.35.72.25410.35.72.255
1010.35.73.0/2410.35.73.1 – 10.35.73.25410.35.73.255
1110.35.74.0/2410.35.74.1 – 10.35.74.25410.35.74.255
1210.35.75.0/2410.35.75.1 – 10.35.75.25410.35.75.255
1310.35.76.0/2410.35.76.1 – 10.35.76.25410.35.76.255
1410.35.77.0/2410.35.77.1 – 10.35.77.25410.35.77.255
1510.35.78.0/2410.35.78.1 – 10.35.78.25410.35.78.255
1610.35.79.0/2410.35.79.1 – 10.35.79.25410.35.79.255
1710.35.80.0/2410.35.80.1 – 10.35.80.25410.35.80.255
1810.35.81.0/2410.35.81.1 – 10.35.81.25410.35.81.255
1910.35.82.0/2410.35.82.1 – 10.35.82.25410.35.82.255
2010.35.83.0/2410.35.83.1 – 10.35.83.25410.35.83.255
2110.35.84.0/2410.35.84.1 – 10.35.84.25410.35.84.255
2210.35.85.0/2410.35.85.1 – 10.35.85.25410.35.85.255
2310.35.86.0/2410.35.86.1 – 10.35.86.25410.35.86.255
2410.35.87.0/2410.35.87.1 – 10.35.87.25410.35.87.255
2510.35.88.0/2410.35.88.1 – 10.35.88.25410.35.88.255
2610.35.89.0/2410.35.89.1 – 10.35.89.25410.35.89.255
2710.35.90.0/2410.35.90.1 – 10.35.90.25410.35.90.255
2810.35.91.0/2410.35.91.1 – 10.35.91.25410.35.91.255
2910.35.92.0/2410.35.92.1 – 10.35.92.25410.35.92.255
3010.35.93.0/2410.35.93.1 – 10.35.93.25410.35.93.255
3110.35.94.0/2410.35.94.1 – 10.35.94.25410.35.94.255
3210.35.95.0/2410.35.95.1 – 10.35.95.25410.35.95.255
3310.35.96.0/2410.35.96.1 – 10.35.96.25410.35.96.255
3410.35.97.0/2410.35.97.1 – 10.35.97.25410.35.97.255
3510.35.98.0/2410.35.98.1 – 10.35.98.25410.35.98.255
3610.35.99.0/2410.35.99.1 – 10.35.99.25410.35.99.255
3710.35.100.0/2410.35.100.1 – 10.35.100.25410.35.100.255
3810.35.101.0/2410.35.101.1 – 10.35.101.25410.35.101.255
3910.35.102.0/2410.35.102.1 – 10.35.102.25410.35.102.255
4010.35.103.0/2410.35.103.1 – 10.35.103.25410.35.103.255
4110.35.104.0/2410.35.104.1 – 10.35.104.25410.35.104.255
4210.35.105.0/2410.35.105.1 – 10.35.105.25410.35.105.255
4310.35.106.0/2410.35.106.1 – 10.35.106.25410.35.106.255
4410.35.107.0/2410.35.107.1 – 10.35.107.25410.35.107.255
4510.35.108.0/2410.35.108.1 – 10.35.108.25410.35.108.255
4610.35.109.0/2410.35.109.1 – 10.35.109.25410.35.109.255
4710.35.110.0/2410.35.110.1 – 10.35.110.25410.35.110.255
4810.35.111.0/2410.35.111.1 – 10.35.111.25410.35.111.255
4910.35.112.0/2410.35.112.1 – 10.35.112.25410.35.112.255
5010.35.113.0/2410.35.113.1 – 10.35.113.25410.35.113.255
5110.35.114.0/2410.35.114.1 – 10.35.114.25410.35.114.255
5210.35.115.0/2410.35.115.1 – 10.35.115.25410.35.115.255
5310.35.116.0/2410.35.116.1 – 10.35.116.25410.35.116.255
5410.35.117.0/2410.35.117.1 – 10.35.117.25410.35.117.255
5510.35.118.0/2410.35.118.1 – 10.35.118.25410.35.118.255
5610.35.119.0/2410.35.119.1 – 10.35.119.25410.35.119.255
5710.35.120.0/2410.35.120.1 – 10.35.120.25410.35.120.255
5810.35.121.0/2410.35.121.1 – 10.35.121.25410.35.121.255
5910.35.122.0/2410.35.122.1 – 10.35.122.25410.35.122.255
6010.35.123.0/2410.35.123.1 – 10.35.123.25410.35.123.255
6110.35.124.0/2410.35.124.1 – 10.35.124.25410.35.124.255
6210.35.125.0/2410.35.125.1 – 10.35.125.25410.35.125.255
6310.35.126.0/2410.35.126.1 – 10.35.126.25410.35.126.255
6410.35.127.0/2410.35.127.1 – 10.35.127.25410.35.127.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /18
/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-
/18255.255.192.016,38416,3821
/19255.255.224.08,1928,1902 split →
/20255.255.240.04,0964,0944 split →
/21255.255.248.02,0482,0468 split →
/22255.255.252.01,0241,02216 split →
/23255.255.254.051251032 split →
/24255.255.255.025625464 split →
/25255.255.255.128128126128 split →
/26255.255.255.1926462256 split →
/27255.255.255.2243230512 split →
/28255.255.255.24016141,024 split →
/29255.255.255.248862,048 split →
/30255.255.255.252424,096 split →
/31255.255.255.254228,192 split →
/32255.255.255.2551116,384 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 →