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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)10.149.85.0/25
network10.149.85.0/25
broadcast10.149.85.127
first host10.149.85.1
last host10.149.85.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.149.85.0/25
address00001010.10010101.01010101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10010101.01010101.00000000
broadcast00001010.10010101.01010101.01111111
green = network part, grey = host part
hex0x0a955500
decimal177558784
reverse dns0.85.149.10.in-addr.arpa
ipv4-mapped::ffff:a95:5500

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.149.85.0/3010.149.85.1 – 10.149.85.210.149.85.3
210.149.85.4/3010.149.85.5 – 10.149.85.610.149.85.7
310.149.85.8/3010.149.85.9 – 10.149.85.1010.149.85.11
410.149.85.12/3010.149.85.13 – 10.149.85.1410.149.85.15
510.149.85.16/3010.149.85.17 – 10.149.85.1810.149.85.19
610.149.85.20/3010.149.85.21 – 10.149.85.2210.149.85.23
710.149.85.24/3010.149.85.25 – 10.149.85.2610.149.85.27
810.149.85.28/3010.149.85.29 – 10.149.85.3010.149.85.31
910.149.85.32/3010.149.85.33 – 10.149.85.3410.149.85.35
1010.149.85.36/3010.149.85.37 – 10.149.85.3810.149.85.39
1110.149.85.40/3010.149.85.41 – 10.149.85.4210.149.85.43
1210.149.85.44/3010.149.85.45 – 10.149.85.4610.149.85.47
1310.149.85.48/3010.149.85.49 – 10.149.85.5010.149.85.51
1410.149.85.52/3010.149.85.53 – 10.149.85.5410.149.85.55
1510.149.85.56/3010.149.85.57 – 10.149.85.5810.149.85.59
1610.149.85.60/3010.149.85.61 – 10.149.85.6210.149.85.63
1710.149.85.64/3010.149.85.65 – 10.149.85.6610.149.85.67
1810.149.85.68/3010.149.85.69 – 10.149.85.7010.149.85.71
1910.149.85.72/3010.149.85.73 – 10.149.85.7410.149.85.75
2010.149.85.76/3010.149.85.77 – 10.149.85.7810.149.85.79
2110.149.85.80/3010.149.85.81 – 10.149.85.8210.149.85.83
2210.149.85.84/3010.149.85.85 – 10.149.85.8610.149.85.87
2310.149.85.88/3010.149.85.89 – 10.149.85.9010.149.85.91
2410.149.85.92/3010.149.85.93 – 10.149.85.9410.149.85.95
2510.149.85.96/3010.149.85.97 – 10.149.85.9810.149.85.99
2610.149.85.100/3010.149.85.101 – 10.149.85.10210.149.85.103
2710.149.85.104/3010.149.85.105 – 10.149.85.10610.149.85.107
2810.149.85.108/3010.149.85.109 – 10.149.85.11010.149.85.111
2910.149.85.112/3010.149.85.113 – 10.149.85.11410.149.85.115
3010.149.85.116/3010.149.85.117 – 10.149.85.11810.149.85.119
3110.149.85.120/3010.149.85.121 – 10.149.85.12210.149.85.123
3210.149.85.124/3010.149.85.125 – 10.149.85.12610.149.85.127
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 →