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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)10.29.0.0/17
network10.29.0.0/17
broadcast10.29.127.255
first host10.29.0.1
last host10.29.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.29.0.0/17
address00001010.00011101.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00011101.00000000.00000000
broadcast00001010.00011101.01111111.11111111
green = network part, grey = host part
hex0x0a1d0000
decimal169672704
reverse dns0.0.29.10.in-addr.arpa
ipv4-mapped::ffff:a1d:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.29.0.0/2310.29.0.1 – 10.29.1.25410.29.1.255
210.29.2.0/2310.29.2.1 – 10.29.3.25410.29.3.255
310.29.4.0/2310.29.4.1 – 10.29.5.25410.29.5.255
410.29.6.0/2310.29.6.1 – 10.29.7.25410.29.7.255
510.29.8.0/2310.29.8.1 – 10.29.9.25410.29.9.255
610.29.10.0/2310.29.10.1 – 10.29.11.25410.29.11.255
710.29.12.0/2310.29.12.1 – 10.29.13.25410.29.13.255
810.29.14.0/2310.29.14.1 – 10.29.15.25410.29.15.255
910.29.16.0/2310.29.16.1 – 10.29.17.25410.29.17.255
1010.29.18.0/2310.29.18.1 – 10.29.19.25410.29.19.255
1110.29.20.0/2310.29.20.1 – 10.29.21.25410.29.21.255
1210.29.22.0/2310.29.22.1 – 10.29.23.25410.29.23.255
1310.29.24.0/2310.29.24.1 – 10.29.25.25410.29.25.255
1410.29.26.0/2310.29.26.1 – 10.29.27.25410.29.27.255
1510.29.28.0/2310.29.28.1 – 10.29.29.25410.29.29.255
1610.29.30.0/2310.29.30.1 – 10.29.31.25410.29.31.255
1710.29.32.0/2310.29.32.1 – 10.29.33.25410.29.33.255
1810.29.34.0/2310.29.34.1 – 10.29.35.25410.29.35.255
1910.29.36.0/2310.29.36.1 – 10.29.37.25410.29.37.255
2010.29.38.0/2310.29.38.1 – 10.29.39.25410.29.39.255
2110.29.40.0/2310.29.40.1 – 10.29.41.25410.29.41.255
2210.29.42.0/2310.29.42.1 – 10.29.43.25410.29.43.255
2310.29.44.0/2310.29.44.1 – 10.29.45.25410.29.45.255
2410.29.46.0/2310.29.46.1 – 10.29.47.25410.29.47.255
2510.29.48.0/2310.29.48.1 – 10.29.49.25410.29.49.255
2610.29.50.0/2310.29.50.1 – 10.29.51.25410.29.51.255
2710.29.52.0/2310.29.52.1 – 10.29.53.25410.29.53.255
2810.29.54.0/2310.29.54.1 – 10.29.55.25410.29.55.255
2910.29.56.0/2310.29.56.1 – 10.29.57.25410.29.57.255
3010.29.58.0/2310.29.58.1 – 10.29.59.25410.29.59.255
3110.29.60.0/2310.29.60.1 – 10.29.61.25410.29.61.255
3210.29.62.0/2310.29.62.1 – 10.29.63.25410.29.63.255
3310.29.64.0/2310.29.64.1 – 10.29.65.25410.29.65.255
3410.29.66.0/2310.29.66.1 – 10.29.67.25410.29.67.255
3510.29.68.0/2310.29.68.1 – 10.29.69.25410.29.69.255
3610.29.70.0/2310.29.70.1 – 10.29.71.25410.29.71.255
3710.29.72.0/2310.29.72.1 – 10.29.73.25410.29.73.255
3810.29.74.0/2310.29.74.1 – 10.29.75.25410.29.75.255
3910.29.76.0/2310.29.76.1 – 10.29.77.25410.29.77.255
4010.29.78.0/2310.29.78.1 – 10.29.79.25410.29.79.255
4110.29.80.0/2310.29.80.1 – 10.29.81.25410.29.81.255
4210.29.82.0/2310.29.82.1 – 10.29.83.25410.29.83.255
4310.29.84.0/2310.29.84.1 – 10.29.85.25410.29.85.255
4410.29.86.0/2310.29.86.1 – 10.29.87.25410.29.87.255
4510.29.88.0/2310.29.88.1 – 10.29.89.25410.29.89.255
4610.29.90.0/2310.29.90.1 – 10.29.91.25410.29.91.255
4710.29.92.0/2310.29.92.1 – 10.29.93.25410.29.93.255
4810.29.94.0/2310.29.94.1 – 10.29.95.25410.29.95.255
4910.29.96.0/2310.29.96.1 – 10.29.97.25410.29.97.255
5010.29.98.0/2310.29.98.1 – 10.29.99.25410.29.99.255
5110.29.100.0/2310.29.100.1 – 10.29.101.25410.29.101.255
5210.29.102.0/2310.29.102.1 – 10.29.103.25410.29.103.255
5310.29.104.0/2310.29.104.1 – 10.29.105.25410.29.105.255
5410.29.106.0/2310.29.106.1 – 10.29.107.25410.29.107.255
5510.29.108.0/2310.29.108.1 – 10.29.109.25410.29.109.255
5610.29.110.0/2310.29.110.1 – 10.29.111.25410.29.111.255
5710.29.112.0/2310.29.112.1 – 10.29.113.25410.29.113.255
5810.29.114.0/2310.29.114.1 – 10.29.115.25410.29.115.255
5910.29.116.0/2310.29.116.1 – 10.29.117.25410.29.117.255
6010.29.118.0/2310.29.118.1 – 10.29.119.25410.29.119.255
6110.29.120.0/2310.29.120.1 – 10.29.121.25410.29.121.255
6210.29.122.0/2310.29.122.1 – 10.29.123.25410.29.123.255
6310.29.124.0/2310.29.124.1 – 10.29.125.25410.29.125.255
6410.29.126.0/2310.29.126.1 – 10.29.127.25410.29.127.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /17
/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-
/17255.255.128.032,76832,7661
/18255.255.192.016,38416,3822 split →
/19255.255.224.08,1928,1904 split →
/20255.255.240.04,0964,0948 split →
/21255.255.248.02,0482,04616 split →
/22255.255.252.01,0241,02232 split →
/23255.255.254.051251064 split →
/24255.255.255.0256254128 split →
/25255.255.255.128128126256 split →
/26255.255.255.1926462512 split →
/27255.255.255.22432301,024 split →
/28255.255.255.24016142,048 split →
/29255.255.255.248864,096 split →
/30255.255.255.252428,192 split →
/31255.255.255.2542216,384 split →
/32255.255.255.2551132,768 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 →