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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)10.87.35.0/25
network10.87.35.0/25
broadcast10.87.35.127
first host10.87.35.1
last host10.87.35.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.87.35.0/25
address00001010.01010111.00100011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01010111.00100011.00000000
broadcast00001010.01010111.00100011.01111111
green = network part, grey = host part
hex0x0a572300
decimal173482752
reverse dns0.35.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:2300

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.87.35.0/3010.87.35.1 – 10.87.35.210.87.35.3
210.87.35.4/3010.87.35.5 – 10.87.35.610.87.35.7
310.87.35.8/3010.87.35.9 – 10.87.35.1010.87.35.11
410.87.35.12/3010.87.35.13 – 10.87.35.1410.87.35.15
510.87.35.16/3010.87.35.17 – 10.87.35.1810.87.35.19
610.87.35.20/3010.87.35.21 – 10.87.35.2210.87.35.23
710.87.35.24/3010.87.35.25 – 10.87.35.2610.87.35.27
810.87.35.28/3010.87.35.29 – 10.87.35.3010.87.35.31
910.87.35.32/3010.87.35.33 – 10.87.35.3410.87.35.35
1010.87.35.36/3010.87.35.37 – 10.87.35.3810.87.35.39
1110.87.35.40/3010.87.35.41 – 10.87.35.4210.87.35.43
1210.87.35.44/3010.87.35.45 – 10.87.35.4610.87.35.47
1310.87.35.48/3010.87.35.49 – 10.87.35.5010.87.35.51
1410.87.35.52/3010.87.35.53 – 10.87.35.5410.87.35.55
1510.87.35.56/3010.87.35.57 – 10.87.35.5810.87.35.59
1610.87.35.60/3010.87.35.61 – 10.87.35.6210.87.35.63
1710.87.35.64/3010.87.35.65 – 10.87.35.6610.87.35.67
1810.87.35.68/3010.87.35.69 – 10.87.35.7010.87.35.71
1910.87.35.72/3010.87.35.73 – 10.87.35.7410.87.35.75
2010.87.35.76/3010.87.35.77 – 10.87.35.7810.87.35.79
2110.87.35.80/3010.87.35.81 – 10.87.35.8210.87.35.83
2210.87.35.84/3010.87.35.85 – 10.87.35.8610.87.35.87
2310.87.35.88/3010.87.35.89 – 10.87.35.9010.87.35.91
2410.87.35.92/3010.87.35.93 – 10.87.35.9410.87.35.95
2510.87.35.96/3010.87.35.97 – 10.87.35.9810.87.35.99
2610.87.35.100/3010.87.35.101 – 10.87.35.10210.87.35.103
2710.87.35.104/3010.87.35.105 – 10.87.35.10610.87.35.107
2810.87.35.108/3010.87.35.109 – 10.87.35.11010.87.35.111
2910.87.35.112/3010.87.35.113 – 10.87.35.11410.87.35.115
3010.87.35.116/3010.87.35.117 – 10.87.35.11810.87.35.119
3110.87.35.120/3010.87.35.121 – 10.87.35.12210.87.35.123
3210.87.35.124/3010.87.35.125 – 10.87.35.12610.87.35.127
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 →