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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)10.2.136.0/27
network10.2.136.0/27
broadcast10.2.136.31
first host10.2.136.1
last host10.2.136.30
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.2.136.0/27
address00001010.00000010.10001000.00000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000010.10001000.00000000
broadcast00001010.00000010.10001000.00011111
green = network part, grey = host part
hex0x0a028800
decimal167938048
reverse dns0.136.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:8800

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.136.0/3210.2.136.0 – 10.2.136.010.2.136.0
210.2.136.1/3210.2.136.1 – 10.2.136.110.2.136.1
310.2.136.2/3210.2.136.2 – 10.2.136.210.2.136.2
410.2.136.3/3210.2.136.3 – 10.2.136.310.2.136.3
510.2.136.4/3210.2.136.4 – 10.2.136.410.2.136.4
610.2.136.5/3210.2.136.5 – 10.2.136.510.2.136.5
710.2.136.6/3210.2.136.6 – 10.2.136.610.2.136.6
810.2.136.7/3210.2.136.7 – 10.2.136.710.2.136.7
910.2.136.8/3210.2.136.8 – 10.2.136.810.2.136.8
1010.2.136.9/3210.2.136.9 – 10.2.136.910.2.136.9
1110.2.136.10/3210.2.136.10 – 10.2.136.1010.2.136.10
1210.2.136.11/3210.2.136.11 – 10.2.136.1110.2.136.11
1310.2.136.12/3210.2.136.12 – 10.2.136.1210.2.136.12
1410.2.136.13/3210.2.136.13 – 10.2.136.1310.2.136.13
1510.2.136.14/3210.2.136.14 – 10.2.136.1410.2.136.14
1610.2.136.15/3210.2.136.15 – 10.2.136.1510.2.136.15
1710.2.136.16/3210.2.136.16 – 10.2.136.1610.2.136.16
1810.2.136.17/3210.2.136.17 – 10.2.136.1710.2.136.17
1910.2.136.18/3210.2.136.18 – 10.2.136.1810.2.136.18
2010.2.136.19/3210.2.136.19 – 10.2.136.1910.2.136.19
2110.2.136.20/3210.2.136.20 – 10.2.136.2010.2.136.20
2210.2.136.21/3210.2.136.21 – 10.2.136.2110.2.136.21
2310.2.136.22/3210.2.136.22 – 10.2.136.2210.2.136.22
2410.2.136.23/3210.2.136.23 – 10.2.136.2310.2.136.23
2510.2.136.24/3210.2.136.24 – 10.2.136.2410.2.136.24
2610.2.136.25/3210.2.136.25 – 10.2.136.2510.2.136.25
2710.2.136.26/3210.2.136.26 – 10.2.136.2610.2.136.26
2810.2.136.27/3210.2.136.27 – 10.2.136.2710.2.136.27
2910.2.136.28/3210.2.136.28 – 10.2.136.2810.2.136.28
3010.2.136.29/3210.2.136.29 – 10.2.136.2910.2.136.29
3110.2.136.30/3210.2.136.30 – 10.2.136.3010.2.136.30
3210.2.136.31/3210.2.136.31 – 10.2.136.3110.2.136.31
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 →