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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)10.65.22.0/27
network10.65.22.0/27
broadcast10.65.22.31
first host10.65.22.1
last host10.65.22.30
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.65.22.0/27
address00001010.01000001.00010110.00000000
subnet mask11111111.11111111.11111111.11100000
network00001010.01000001.00010110.00000000
broadcast00001010.01000001.00010110.00011111
green = network part, grey = host part
hex0x0a411600
decimal172037632
reverse dns0.22.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:1600

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.65.22.0/3210.65.22.0 – 10.65.22.010.65.22.0
210.65.22.1/3210.65.22.1 – 10.65.22.110.65.22.1
310.65.22.2/3210.65.22.2 – 10.65.22.210.65.22.2
410.65.22.3/3210.65.22.3 – 10.65.22.310.65.22.3
510.65.22.4/3210.65.22.4 – 10.65.22.410.65.22.4
610.65.22.5/3210.65.22.5 – 10.65.22.510.65.22.5
710.65.22.6/3210.65.22.6 – 10.65.22.610.65.22.6
810.65.22.7/3210.65.22.7 – 10.65.22.710.65.22.7
910.65.22.8/3210.65.22.8 – 10.65.22.810.65.22.8
1010.65.22.9/3210.65.22.9 – 10.65.22.910.65.22.9
1110.65.22.10/3210.65.22.10 – 10.65.22.1010.65.22.10
1210.65.22.11/3210.65.22.11 – 10.65.22.1110.65.22.11
1310.65.22.12/3210.65.22.12 – 10.65.22.1210.65.22.12
1410.65.22.13/3210.65.22.13 – 10.65.22.1310.65.22.13
1510.65.22.14/3210.65.22.14 – 10.65.22.1410.65.22.14
1610.65.22.15/3210.65.22.15 – 10.65.22.1510.65.22.15
1710.65.22.16/3210.65.22.16 – 10.65.22.1610.65.22.16
1810.65.22.17/3210.65.22.17 – 10.65.22.1710.65.22.17
1910.65.22.18/3210.65.22.18 – 10.65.22.1810.65.22.18
2010.65.22.19/3210.65.22.19 – 10.65.22.1910.65.22.19
2110.65.22.20/3210.65.22.20 – 10.65.22.2010.65.22.20
2210.65.22.21/3210.65.22.21 – 10.65.22.2110.65.22.21
2310.65.22.22/3210.65.22.22 – 10.65.22.2210.65.22.22
2410.65.22.23/3210.65.22.23 – 10.65.22.2310.65.22.23
2510.65.22.24/3210.65.22.24 – 10.65.22.2410.65.22.24
2610.65.22.25/3210.65.22.25 – 10.65.22.2510.65.22.25
2710.65.22.26/3210.65.22.26 – 10.65.22.2610.65.22.26
2810.65.22.27/3210.65.22.27 – 10.65.22.2710.65.22.27
2910.65.22.28/3210.65.22.28 – 10.65.22.2810.65.22.28
3010.65.22.29/3210.65.22.29 – 10.65.22.2910.65.22.29
3110.65.22.30/3210.65.22.30 – 10.65.22.3010.65.22.30
3210.65.22.31/3210.65.22.31 – 10.65.22.3110.65.22.31
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 →