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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)10.82.2.0/25
network10.82.2.0/25
broadcast10.82.2.127
first host10.82.2.1
last host10.82.2.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.82.2.0/25
address00001010.01010010.00000010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01010010.00000010.00000000
broadcast00001010.01010010.00000010.01111111
green = network part, grey = host part
hex0x0a520200
decimal173146624
reverse dns0.2.82.10.in-addr.arpa
ipv4-mapped::ffff:a52:200

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.82.2.0/3010.82.2.1 – 10.82.2.210.82.2.3
210.82.2.4/3010.82.2.5 – 10.82.2.610.82.2.7
310.82.2.8/3010.82.2.9 – 10.82.2.1010.82.2.11
410.82.2.12/3010.82.2.13 – 10.82.2.1410.82.2.15
510.82.2.16/3010.82.2.17 – 10.82.2.1810.82.2.19
610.82.2.20/3010.82.2.21 – 10.82.2.2210.82.2.23
710.82.2.24/3010.82.2.25 – 10.82.2.2610.82.2.27
810.82.2.28/3010.82.2.29 – 10.82.2.3010.82.2.31
910.82.2.32/3010.82.2.33 – 10.82.2.3410.82.2.35
1010.82.2.36/3010.82.2.37 – 10.82.2.3810.82.2.39
1110.82.2.40/3010.82.2.41 – 10.82.2.4210.82.2.43
1210.82.2.44/3010.82.2.45 – 10.82.2.4610.82.2.47
1310.82.2.48/3010.82.2.49 – 10.82.2.5010.82.2.51
1410.82.2.52/3010.82.2.53 – 10.82.2.5410.82.2.55
1510.82.2.56/3010.82.2.57 – 10.82.2.5810.82.2.59
1610.82.2.60/3010.82.2.61 – 10.82.2.6210.82.2.63
1710.82.2.64/3010.82.2.65 – 10.82.2.6610.82.2.67
1810.82.2.68/3010.82.2.69 – 10.82.2.7010.82.2.71
1910.82.2.72/3010.82.2.73 – 10.82.2.7410.82.2.75
2010.82.2.76/3010.82.2.77 – 10.82.2.7810.82.2.79
2110.82.2.80/3010.82.2.81 – 10.82.2.8210.82.2.83
2210.82.2.84/3010.82.2.85 – 10.82.2.8610.82.2.87
2310.82.2.88/3010.82.2.89 – 10.82.2.9010.82.2.91
2410.82.2.92/3010.82.2.93 – 10.82.2.9410.82.2.95
2510.82.2.96/3010.82.2.97 – 10.82.2.9810.82.2.99
2610.82.2.100/3010.82.2.101 – 10.82.2.10210.82.2.103
2710.82.2.104/3010.82.2.105 – 10.82.2.10610.82.2.107
2810.82.2.108/3010.82.2.109 – 10.82.2.11010.82.2.111
2910.82.2.112/3010.82.2.113 – 10.82.2.11410.82.2.115
3010.82.2.116/3010.82.2.117 – 10.82.2.11810.82.2.119
3110.82.2.120/3010.82.2.121 – 10.82.2.12210.82.2.123
3210.82.2.124/3010.82.2.125 – 10.82.2.12610.82.2.127
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →