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)10.21.0.0/17
network10.21.0.0/17
broadcast10.21.127.255
first host10.21.0.1
last host10.21.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.21.0.0/17
address00001010.00010101.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00010101.00000000.00000000
broadcast00001010.00010101.01111111.11111111
green = network part, grey = host part
hex0x0a150000
decimal169148416
reverse dns0.0.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:0

/17 split into /24 · 128 subnets

close ×
#networkhost rangebroadcast
110.21.0.0/2410.21.0.1 – 10.21.0.25410.21.0.255
210.21.1.0/2410.21.1.1 – 10.21.1.25410.21.1.255
310.21.2.0/2410.21.2.1 – 10.21.2.25410.21.2.255
410.21.3.0/2410.21.3.1 – 10.21.3.25410.21.3.255
510.21.4.0/2410.21.4.1 – 10.21.4.25410.21.4.255
610.21.5.0/2410.21.5.1 – 10.21.5.25410.21.5.255
710.21.6.0/2410.21.6.1 – 10.21.6.25410.21.6.255
810.21.7.0/2410.21.7.1 – 10.21.7.25410.21.7.255
910.21.8.0/2410.21.8.1 – 10.21.8.25410.21.8.255
1010.21.9.0/2410.21.9.1 – 10.21.9.25410.21.9.255
1110.21.10.0/2410.21.10.1 – 10.21.10.25410.21.10.255
1210.21.11.0/2410.21.11.1 – 10.21.11.25410.21.11.255
1310.21.12.0/2410.21.12.1 – 10.21.12.25410.21.12.255
1410.21.13.0/2410.21.13.1 – 10.21.13.25410.21.13.255
1510.21.14.0/2410.21.14.1 – 10.21.14.25410.21.14.255
1610.21.15.0/2410.21.15.1 – 10.21.15.25410.21.15.255
1710.21.16.0/2410.21.16.1 – 10.21.16.25410.21.16.255
1810.21.17.0/2410.21.17.1 – 10.21.17.25410.21.17.255
1910.21.18.0/2410.21.18.1 – 10.21.18.25410.21.18.255
2010.21.19.0/2410.21.19.1 – 10.21.19.25410.21.19.255
2110.21.20.0/2410.21.20.1 – 10.21.20.25410.21.20.255
2210.21.21.0/2410.21.21.1 – 10.21.21.25410.21.21.255
2310.21.22.0/2410.21.22.1 – 10.21.22.25410.21.22.255
2410.21.23.0/2410.21.23.1 – 10.21.23.25410.21.23.255
2510.21.24.0/2410.21.24.1 – 10.21.24.25410.21.24.255
2610.21.25.0/2410.21.25.1 – 10.21.25.25410.21.25.255
2710.21.26.0/2410.21.26.1 – 10.21.26.25410.21.26.255
2810.21.27.0/2410.21.27.1 – 10.21.27.25410.21.27.255
2910.21.28.0/2410.21.28.1 – 10.21.28.25410.21.28.255
3010.21.29.0/2410.21.29.1 – 10.21.29.25410.21.29.255
3110.21.30.0/2410.21.30.1 – 10.21.30.25410.21.30.255
3210.21.31.0/2410.21.31.1 – 10.21.31.25410.21.31.255
3310.21.32.0/2410.21.32.1 – 10.21.32.25410.21.32.255
3410.21.33.0/2410.21.33.1 – 10.21.33.25410.21.33.255
3510.21.34.0/2410.21.34.1 – 10.21.34.25410.21.34.255
3610.21.35.0/2410.21.35.1 – 10.21.35.25410.21.35.255
3710.21.36.0/2410.21.36.1 – 10.21.36.25410.21.36.255
3810.21.37.0/2410.21.37.1 – 10.21.37.25410.21.37.255
3910.21.38.0/2410.21.38.1 – 10.21.38.25410.21.38.255
4010.21.39.0/2410.21.39.1 – 10.21.39.25410.21.39.255
4110.21.40.0/2410.21.40.1 – 10.21.40.25410.21.40.255
4210.21.41.0/2410.21.41.1 – 10.21.41.25410.21.41.255
4310.21.42.0/2410.21.42.1 – 10.21.42.25410.21.42.255
4410.21.43.0/2410.21.43.1 – 10.21.43.25410.21.43.255
4510.21.44.0/2410.21.44.1 – 10.21.44.25410.21.44.255
4610.21.45.0/2410.21.45.1 – 10.21.45.25410.21.45.255
4710.21.46.0/2410.21.46.1 – 10.21.46.25410.21.46.255
4810.21.47.0/2410.21.47.1 – 10.21.47.25410.21.47.255
4910.21.48.0/2410.21.48.1 – 10.21.48.25410.21.48.255
5010.21.49.0/2410.21.49.1 – 10.21.49.25410.21.49.255
5110.21.50.0/2410.21.50.1 – 10.21.50.25410.21.50.255
5210.21.51.0/2410.21.51.1 – 10.21.51.25410.21.51.255
5310.21.52.0/2410.21.52.1 – 10.21.52.25410.21.52.255
5410.21.53.0/2410.21.53.1 – 10.21.53.25410.21.53.255
5510.21.54.0/2410.21.54.1 – 10.21.54.25410.21.54.255
5610.21.55.0/2410.21.55.1 – 10.21.55.25410.21.55.255
5710.21.56.0/2410.21.56.1 – 10.21.56.25410.21.56.255
5810.21.57.0/2410.21.57.1 – 10.21.57.25410.21.57.255
5910.21.58.0/2410.21.58.1 – 10.21.58.25410.21.58.255
6010.21.59.0/2410.21.59.1 – 10.21.59.25410.21.59.255
6110.21.60.0/2410.21.60.1 – 10.21.60.25410.21.60.255
6210.21.61.0/2410.21.61.1 – 10.21.61.25410.21.61.255
6310.21.62.0/2410.21.62.1 – 10.21.62.25410.21.62.255
6410.21.63.0/2410.21.63.1 – 10.21.63.25410.21.63.255
6510.21.64.0/2410.21.64.1 – 10.21.64.25410.21.64.255
6610.21.65.0/2410.21.65.1 – 10.21.65.25410.21.65.255
6710.21.66.0/2410.21.66.1 – 10.21.66.25410.21.66.255
6810.21.67.0/2410.21.67.1 – 10.21.67.25410.21.67.255
6910.21.68.0/2410.21.68.1 – 10.21.68.25410.21.68.255
7010.21.69.0/2410.21.69.1 – 10.21.69.25410.21.69.255
7110.21.70.0/2410.21.70.1 – 10.21.70.25410.21.70.255
7210.21.71.0/2410.21.71.1 – 10.21.71.25410.21.71.255
7310.21.72.0/2410.21.72.1 – 10.21.72.25410.21.72.255
7410.21.73.0/2410.21.73.1 – 10.21.73.25410.21.73.255
7510.21.74.0/2410.21.74.1 – 10.21.74.25410.21.74.255
7610.21.75.0/2410.21.75.1 – 10.21.75.25410.21.75.255
7710.21.76.0/2410.21.76.1 – 10.21.76.25410.21.76.255
7810.21.77.0/2410.21.77.1 – 10.21.77.25410.21.77.255
7910.21.78.0/2410.21.78.1 – 10.21.78.25410.21.78.255
8010.21.79.0/2410.21.79.1 – 10.21.79.25410.21.79.255
8110.21.80.0/2410.21.80.1 – 10.21.80.25410.21.80.255
8210.21.81.0/2410.21.81.1 – 10.21.81.25410.21.81.255
8310.21.82.0/2410.21.82.1 – 10.21.82.25410.21.82.255
8410.21.83.0/2410.21.83.1 – 10.21.83.25410.21.83.255
8510.21.84.0/2410.21.84.1 – 10.21.84.25410.21.84.255
8610.21.85.0/2410.21.85.1 – 10.21.85.25410.21.85.255
8710.21.86.0/2410.21.86.1 – 10.21.86.25410.21.86.255
8810.21.87.0/2410.21.87.1 – 10.21.87.25410.21.87.255
8910.21.88.0/2410.21.88.1 – 10.21.88.25410.21.88.255
9010.21.89.0/2410.21.89.1 – 10.21.89.25410.21.89.255
9110.21.90.0/2410.21.90.1 – 10.21.90.25410.21.90.255
9210.21.91.0/2410.21.91.1 – 10.21.91.25410.21.91.255
9310.21.92.0/2410.21.92.1 – 10.21.92.25410.21.92.255
9410.21.93.0/2410.21.93.1 – 10.21.93.25410.21.93.255
9510.21.94.0/2410.21.94.1 – 10.21.94.25410.21.94.255
9610.21.95.0/2410.21.95.1 – 10.21.95.25410.21.95.255
9710.21.96.0/2410.21.96.1 – 10.21.96.25410.21.96.255
9810.21.97.0/2410.21.97.1 – 10.21.97.25410.21.97.255
9910.21.98.0/2410.21.98.1 – 10.21.98.25410.21.98.255
10010.21.99.0/2410.21.99.1 – 10.21.99.25410.21.99.255
10110.21.100.0/2410.21.100.1 – 10.21.100.25410.21.100.255
10210.21.101.0/2410.21.101.1 – 10.21.101.25410.21.101.255
10310.21.102.0/2410.21.102.1 – 10.21.102.25410.21.102.255
10410.21.103.0/2410.21.103.1 – 10.21.103.25410.21.103.255
10510.21.104.0/2410.21.104.1 – 10.21.104.25410.21.104.255
10610.21.105.0/2410.21.105.1 – 10.21.105.25410.21.105.255
10710.21.106.0/2410.21.106.1 – 10.21.106.25410.21.106.255
10810.21.107.0/2410.21.107.1 – 10.21.107.25410.21.107.255
10910.21.108.0/2410.21.108.1 – 10.21.108.25410.21.108.255
11010.21.109.0/2410.21.109.1 – 10.21.109.25410.21.109.255
11110.21.110.0/2410.21.110.1 – 10.21.110.25410.21.110.255
11210.21.111.0/2410.21.111.1 – 10.21.111.25410.21.111.255
11310.21.112.0/2410.21.112.1 – 10.21.112.25410.21.112.255
11410.21.113.0/2410.21.113.1 – 10.21.113.25410.21.113.255
11510.21.114.0/2410.21.114.1 – 10.21.114.25410.21.114.255
11610.21.115.0/2410.21.115.1 – 10.21.115.25410.21.115.255
11710.21.116.0/2410.21.116.1 – 10.21.116.25410.21.116.255
11810.21.117.0/2410.21.117.1 – 10.21.117.25410.21.117.255
11910.21.118.0/2410.21.118.1 – 10.21.118.25410.21.118.255
12010.21.119.0/2410.21.119.1 – 10.21.119.25410.21.119.255
12110.21.120.0/2410.21.120.1 – 10.21.120.25410.21.120.255
12210.21.121.0/2410.21.121.1 – 10.21.121.25410.21.121.255
12310.21.122.0/2410.21.122.1 – 10.21.122.25410.21.122.255
12410.21.123.0/2410.21.123.1 – 10.21.123.25410.21.123.255
12510.21.124.0/2410.21.124.1 – 10.21.124.25410.21.124.255
12610.21.125.0/2410.21.125.1 – 10.21.125.25410.21.125.255
12710.21.126.0/2410.21.126.1 – 10.21.126.25410.21.126.255
12810.21.127.0/2410.21.127.1 – 10.21.127.25410.21.127.255
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 →