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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)10.0.2.0/27
network10.0.2.0/27
broadcast10.0.2.31
first host10.0.2.1
last host10.0.2.30
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.0.2.0/27
address00001010.00000000.00000010.00000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000000.00000010.00000000
broadcast00001010.00000000.00000010.00011111
green = network part, grey = host part
hex0x0a000200
decimal167772672
reverse dns0.2.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:200

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.2.0/3210.0.2.0 – 10.0.2.010.0.2.0
210.0.2.1/3210.0.2.1 – 10.0.2.110.0.2.1
310.0.2.2/3210.0.2.2 – 10.0.2.210.0.2.2
410.0.2.3/3210.0.2.3 – 10.0.2.310.0.2.3
510.0.2.4/3210.0.2.4 – 10.0.2.410.0.2.4
610.0.2.5/3210.0.2.5 – 10.0.2.510.0.2.5
710.0.2.6/3210.0.2.6 – 10.0.2.610.0.2.6
810.0.2.7/3210.0.2.7 – 10.0.2.710.0.2.7
910.0.2.8/3210.0.2.8 – 10.0.2.810.0.2.8
1010.0.2.9/3210.0.2.9 – 10.0.2.910.0.2.9
1110.0.2.10/3210.0.2.10 – 10.0.2.1010.0.2.10
1210.0.2.11/3210.0.2.11 – 10.0.2.1110.0.2.11
1310.0.2.12/3210.0.2.12 – 10.0.2.1210.0.2.12
1410.0.2.13/3210.0.2.13 – 10.0.2.1310.0.2.13
1510.0.2.14/3210.0.2.14 – 10.0.2.1410.0.2.14
1610.0.2.15/3210.0.2.15 – 10.0.2.1510.0.2.15
1710.0.2.16/3210.0.2.16 – 10.0.2.1610.0.2.16
1810.0.2.17/3210.0.2.17 – 10.0.2.1710.0.2.17
1910.0.2.18/3210.0.2.18 – 10.0.2.1810.0.2.18
2010.0.2.19/3210.0.2.19 – 10.0.2.1910.0.2.19
2110.0.2.20/3210.0.2.20 – 10.0.2.2010.0.2.20
2210.0.2.21/3210.0.2.21 – 10.0.2.2110.0.2.21
2310.0.2.22/3210.0.2.22 – 10.0.2.2210.0.2.22
2410.0.2.23/3210.0.2.23 – 10.0.2.2310.0.2.23
2510.0.2.24/3210.0.2.24 – 10.0.2.2410.0.2.24
2610.0.2.25/3210.0.2.25 – 10.0.2.2510.0.2.25
2710.0.2.26/3210.0.2.26 – 10.0.2.2610.0.2.26
2810.0.2.27/3210.0.2.27 – 10.0.2.2710.0.2.27
2910.0.2.28/3210.0.2.28 – 10.0.2.2810.0.2.28
3010.0.2.29/3210.0.2.29 – 10.0.2.2910.0.2.29
3110.0.2.30/3210.0.2.30 – 10.0.2.3010.0.2.30
3210.0.2.31/3210.0.2.31 – 10.0.2.3110.0.2.31
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 →