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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)10.2.80.0/20
network10.2.80.0/20
broadcast10.2.95.255
first host10.2.80.1
last host10.2.95.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.2.80.0/20
address00001010.00000010.01010000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000010.01010000.00000000
broadcast00001010.00000010.01011111.11111111
green = network part, grey = host part
hex0x0a025000
decimal167923712
reverse dns0.80.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.80.0/2610.2.80.1 – 10.2.80.6210.2.80.63
210.2.80.64/2610.2.80.65 – 10.2.80.12610.2.80.127
310.2.80.128/2610.2.80.129 – 10.2.80.19010.2.80.191
410.2.80.192/2610.2.80.193 – 10.2.80.25410.2.80.255
510.2.81.0/2610.2.81.1 – 10.2.81.6210.2.81.63
610.2.81.64/2610.2.81.65 – 10.2.81.12610.2.81.127
710.2.81.128/2610.2.81.129 – 10.2.81.19010.2.81.191
810.2.81.192/2610.2.81.193 – 10.2.81.25410.2.81.255
910.2.82.0/2610.2.82.1 – 10.2.82.6210.2.82.63
1010.2.82.64/2610.2.82.65 – 10.2.82.12610.2.82.127
1110.2.82.128/2610.2.82.129 – 10.2.82.19010.2.82.191
1210.2.82.192/2610.2.82.193 – 10.2.82.25410.2.82.255
1310.2.83.0/2610.2.83.1 – 10.2.83.6210.2.83.63
1410.2.83.64/2610.2.83.65 – 10.2.83.12610.2.83.127
1510.2.83.128/2610.2.83.129 – 10.2.83.19010.2.83.191
1610.2.83.192/2610.2.83.193 – 10.2.83.25410.2.83.255
1710.2.84.0/2610.2.84.1 – 10.2.84.6210.2.84.63
1810.2.84.64/2610.2.84.65 – 10.2.84.12610.2.84.127
1910.2.84.128/2610.2.84.129 – 10.2.84.19010.2.84.191
2010.2.84.192/2610.2.84.193 – 10.2.84.25410.2.84.255
2110.2.85.0/2610.2.85.1 – 10.2.85.6210.2.85.63
2210.2.85.64/2610.2.85.65 – 10.2.85.12610.2.85.127
2310.2.85.128/2610.2.85.129 – 10.2.85.19010.2.85.191
2410.2.85.192/2610.2.85.193 – 10.2.85.25410.2.85.255
2510.2.86.0/2610.2.86.1 – 10.2.86.6210.2.86.63
2610.2.86.64/2610.2.86.65 – 10.2.86.12610.2.86.127
2710.2.86.128/2610.2.86.129 – 10.2.86.19010.2.86.191
2810.2.86.192/2610.2.86.193 – 10.2.86.25410.2.86.255
2910.2.87.0/2610.2.87.1 – 10.2.87.6210.2.87.63
3010.2.87.64/2610.2.87.65 – 10.2.87.12610.2.87.127
3110.2.87.128/2610.2.87.129 – 10.2.87.19010.2.87.191
3210.2.87.192/2610.2.87.193 – 10.2.87.25410.2.87.255
3310.2.88.0/2610.2.88.1 – 10.2.88.6210.2.88.63
3410.2.88.64/2610.2.88.65 – 10.2.88.12610.2.88.127
3510.2.88.128/2610.2.88.129 – 10.2.88.19010.2.88.191
3610.2.88.192/2610.2.88.193 – 10.2.88.25410.2.88.255
3710.2.89.0/2610.2.89.1 – 10.2.89.6210.2.89.63
3810.2.89.64/2610.2.89.65 – 10.2.89.12610.2.89.127
3910.2.89.128/2610.2.89.129 – 10.2.89.19010.2.89.191
4010.2.89.192/2610.2.89.193 – 10.2.89.25410.2.89.255
4110.2.90.0/2610.2.90.1 – 10.2.90.6210.2.90.63
4210.2.90.64/2610.2.90.65 – 10.2.90.12610.2.90.127
4310.2.90.128/2610.2.90.129 – 10.2.90.19010.2.90.191
4410.2.90.192/2610.2.90.193 – 10.2.90.25410.2.90.255
4510.2.91.0/2610.2.91.1 – 10.2.91.6210.2.91.63
4610.2.91.64/2610.2.91.65 – 10.2.91.12610.2.91.127
4710.2.91.128/2610.2.91.129 – 10.2.91.19010.2.91.191
4810.2.91.192/2610.2.91.193 – 10.2.91.25410.2.91.255
4910.2.92.0/2610.2.92.1 – 10.2.92.6210.2.92.63
5010.2.92.64/2610.2.92.65 – 10.2.92.12610.2.92.127
5110.2.92.128/2610.2.92.129 – 10.2.92.19010.2.92.191
5210.2.92.192/2610.2.92.193 – 10.2.92.25410.2.92.255
5310.2.93.0/2610.2.93.1 – 10.2.93.6210.2.93.63
5410.2.93.64/2610.2.93.65 – 10.2.93.12610.2.93.127
5510.2.93.128/2610.2.93.129 – 10.2.93.19010.2.93.191
5610.2.93.192/2610.2.93.193 – 10.2.93.25410.2.93.255
5710.2.94.0/2610.2.94.1 – 10.2.94.6210.2.94.63
5810.2.94.64/2610.2.94.65 – 10.2.94.12610.2.94.127
5910.2.94.128/2610.2.94.129 – 10.2.94.19010.2.94.191
6010.2.94.192/2610.2.94.193 – 10.2.94.25410.2.94.255
6110.2.95.0/2610.2.95.1 – 10.2.95.6210.2.95.63
6210.2.95.64/2610.2.95.65 – 10.2.95.12610.2.95.127
6310.2.95.128/2610.2.95.129 – 10.2.95.19010.2.95.191
6410.2.95.192/2610.2.95.193 – 10.2.95.25410.2.95.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →