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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)10.45.0.0/17
network10.45.0.0/17
broadcast10.45.127.255
first host10.45.0.1
last host10.45.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.45.0.0/17
address00001010.00101101.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00101101.00000000.00000000
broadcast00001010.00101101.01111111.11111111
green = network part, grey = host part
hex0x0a2d0000
decimal170721280
reverse dns0.0.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.0.0/2310.45.0.1 – 10.45.1.25410.45.1.255
210.45.2.0/2310.45.2.1 – 10.45.3.25410.45.3.255
310.45.4.0/2310.45.4.1 – 10.45.5.25410.45.5.255
410.45.6.0/2310.45.6.1 – 10.45.7.25410.45.7.255
510.45.8.0/2310.45.8.1 – 10.45.9.25410.45.9.255
610.45.10.0/2310.45.10.1 – 10.45.11.25410.45.11.255
710.45.12.0/2310.45.12.1 – 10.45.13.25410.45.13.255
810.45.14.0/2310.45.14.1 – 10.45.15.25410.45.15.255
910.45.16.0/2310.45.16.1 – 10.45.17.25410.45.17.255
1010.45.18.0/2310.45.18.1 – 10.45.19.25410.45.19.255
1110.45.20.0/2310.45.20.1 – 10.45.21.25410.45.21.255
1210.45.22.0/2310.45.22.1 – 10.45.23.25410.45.23.255
1310.45.24.0/2310.45.24.1 – 10.45.25.25410.45.25.255
1410.45.26.0/2310.45.26.1 – 10.45.27.25410.45.27.255
1510.45.28.0/2310.45.28.1 – 10.45.29.25410.45.29.255
1610.45.30.0/2310.45.30.1 – 10.45.31.25410.45.31.255
1710.45.32.0/2310.45.32.1 – 10.45.33.25410.45.33.255
1810.45.34.0/2310.45.34.1 – 10.45.35.25410.45.35.255
1910.45.36.0/2310.45.36.1 – 10.45.37.25410.45.37.255
2010.45.38.0/2310.45.38.1 – 10.45.39.25410.45.39.255
2110.45.40.0/2310.45.40.1 – 10.45.41.25410.45.41.255
2210.45.42.0/2310.45.42.1 – 10.45.43.25410.45.43.255
2310.45.44.0/2310.45.44.1 – 10.45.45.25410.45.45.255
2410.45.46.0/2310.45.46.1 – 10.45.47.25410.45.47.255
2510.45.48.0/2310.45.48.1 – 10.45.49.25410.45.49.255
2610.45.50.0/2310.45.50.1 – 10.45.51.25410.45.51.255
2710.45.52.0/2310.45.52.1 – 10.45.53.25410.45.53.255
2810.45.54.0/2310.45.54.1 – 10.45.55.25410.45.55.255
2910.45.56.0/2310.45.56.1 – 10.45.57.25410.45.57.255
3010.45.58.0/2310.45.58.1 – 10.45.59.25410.45.59.255
3110.45.60.0/2310.45.60.1 – 10.45.61.25410.45.61.255
3210.45.62.0/2310.45.62.1 – 10.45.63.25410.45.63.255
3310.45.64.0/2310.45.64.1 – 10.45.65.25410.45.65.255
3410.45.66.0/2310.45.66.1 – 10.45.67.25410.45.67.255
3510.45.68.0/2310.45.68.1 – 10.45.69.25410.45.69.255
3610.45.70.0/2310.45.70.1 – 10.45.71.25410.45.71.255
3710.45.72.0/2310.45.72.1 – 10.45.73.25410.45.73.255
3810.45.74.0/2310.45.74.1 – 10.45.75.25410.45.75.255
3910.45.76.0/2310.45.76.1 – 10.45.77.25410.45.77.255
4010.45.78.0/2310.45.78.1 – 10.45.79.25410.45.79.255
4110.45.80.0/2310.45.80.1 – 10.45.81.25410.45.81.255
4210.45.82.0/2310.45.82.1 – 10.45.83.25410.45.83.255
4310.45.84.0/2310.45.84.1 – 10.45.85.25410.45.85.255
4410.45.86.0/2310.45.86.1 – 10.45.87.25410.45.87.255
4510.45.88.0/2310.45.88.1 – 10.45.89.25410.45.89.255
4610.45.90.0/2310.45.90.1 – 10.45.91.25410.45.91.255
4710.45.92.0/2310.45.92.1 – 10.45.93.25410.45.93.255
4810.45.94.0/2310.45.94.1 – 10.45.95.25410.45.95.255
4910.45.96.0/2310.45.96.1 – 10.45.97.25410.45.97.255
5010.45.98.0/2310.45.98.1 – 10.45.99.25410.45.99.255
5110.45.100.0/2310.45.100.1 – 10.45.101.25410.45.101.255
5210.45.102.0/2310.45.102.1 – 10.45.103.25410.45.103.255
5310.45.104.0/2310.45.104.1 – 10.45.105.25410.45.105.255
5410.45.106.0/2310.45.106.1 – 10.45.107.25410.45.107.255
5510.45.108.0/2310.45.108.1 – 10.45.109.25410.45.109.255
5610.45.110.0/2310.45.110.1 – 10.45.111.25410.45.111.255
5710.45.112.0/2310.45.112.1 – 10.45.113.25410.45.113.255
5810.45.114.0/2310.45.114.1 – 10.45.115.25410.45.115.255
5910.45.116.0/2310.45.116.1 – 10.45.117.25410.45.117.255
6010.45.118.0/2310.45.118.1 – 10.45.119.25410.45.119.255
6110.45.120.0/2310.45.120.1 – 10.45.121.25410.45.121.255
6210.45.122.0/2310.45.122.1 – 10.45.123.25410.45.123.255
6310.45.124.0/2310.45.124.1 – 10.45.125.25410.45.125.255
6410.45.126.0/2310.45.126.1 – 10.45.127.25410.45.127.255
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 →