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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)10.103.131.0/27
network10.103.131.0/27
broadcast10.103.131.31
first host10.103.131.1
last host10.103.131.30
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.103.131.0/27
address00001010.01100111.10000011.00000000
subnet mask11111111.11111111.11111111.11100000
network00001010.01100111.10000011.00000000
broadcast00001010.01100111.10000011.00011111
green = network part, grey = host part
hex0x0a678300
decimal174555904
reverse dns0.131.103.10.in-addr.arpa
ipv4-mapped::ffff:a67:8300

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.103.131.0/3210.103.131.0 – 10.103.131.010.103.131.0
210.103.131.1/3210.103.131.1 – 10.103.131.110.103.131.1
310.103.131.2/3210.103.131.2 – 10.103.131.210.103.131.2
410.103.131.3/3210.103.131.3 – 10.103.131.310.103.131.3
510.103.131.4/3210.103.131.4 – 10.103.131.410.103.131.4
610.103.131.5/3210.103.131.5 – 10.103.131.510.103.131.5
710.103.131.6/3210.103.131.6 – 10.103.131.610.103.131.6
810.103.131.7/3210.103.131.7 – 10.103.131.710.103.131.7
910.103.131.8/3210.103.131.8 – 10.103.131.810.103.131.8
1010.103.131.9/3210.103.131.9 – 10.103.131.910.103.131.9
1110.103.131.10/3210.103.131.10 – 10.103.131.1010.103.131.10
1210.103.131.11/3210.103.131.11 – 10.103.131.1110.103.131.11
1310.103.131.12/3210.103.131.12 – 10.103.131.1210.103.131.12
1410.103.131.13/3210.103.131.13 – 10.103.131.1310.103.131.13
1510.103.131.14/3210.103.131.14 – 10.103.131.1410.103.131.14
1610.103.131.15/3210.103.131.15 – 10.103.131.1510.103.131.15
1710.103.131.16/3210.103.131.16 – 10.103.131.1610.103.131.16
1810.103.131.17/3210.103.131.17 – 10.103.131.1710.103.131.17
1910.103.131.18/3210.103.131.18 – 10.103.131.1810.103.131.18
2010.103.131.19/3210.103.131.19 – 10.103.131.1910.103.131.19
2110.103.131.20/3210.103.131.20 – 10.103.131.2010.103.131.20
2210.103.131.21/3210.103.131.21 – 10.103.131.2110.103.131.21
2310.103.131.22/3210.103.131.22 – 10.103.131.2210.103.131.22
2410.103.131.23/3210.103.131.23 – 10.103.131.2310.103.131.23
2510.103.131.24/3210.103.131.24 – 10.103.131.2410.103.131.24
2610.103.131.25/3210.103.131.25 – 10.103.131.2510.103.131.25
2710.103.131.26/3210.103.131.26 – 10.103.131.2610.103.131.26
2810.103.131.27/3210.103.131.27 – 10.103.131.2710.103.131.27
2910.103.131.28/3210.103.131.28 – 10.103.131.2810.103.131.28
3010.103.131.29/3210.103.131.29 – 10.103.131.2910.103.131.29
3110.103.131.30/3210.103.131.30 – 10.103.131.3010.103.131.30
3210.103.131.31/3210.103.131.31 – 10.103.131.3110.103.131.31
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /27
/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-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.1926462-
/27255.255.255.22432301
/28255.255.255.24016142 split →
/29255.255.255.248864 split →
/30255.255.255.252428 split →
/31255.255.255.2542216 split →
/32255.255.255.2551132 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 →