ip
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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)172.16.7.0/25
network172.16.7.0/25
broadcast172.16.7.127
first host172.16.7.1
last host172.16.7.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classB
ipcalc 172.16.7.0/25
address10101100.00010000.00000111.00000000
subnet mask11111111.11111111.11111111.10000000
network10101100.00010000.00000111.00000000
broadcast10101100.00010000.00000111.01111111
green = network part, grey = host part
hex0xac100700
decimal2886731520
reverse dns0.7.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:700

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.7.0/30172.16.7.1 – 172.16.7.2172.16.7.3
2172.16.7.4/30172.16.7.5 – 172.16.7.6172.16.7.7
3172.16.7.8/30172.16.7.9 – 172.16.7.10172.16.7.11
4172.16.7.12/30172.16.7.13 – 172.16.7.14172.16.7.15
5172.16.7.16/30172.16.7.17 – 172.16.7.18172.16.7.19
6172.16.7.20/30172.16.7.21 – 172.16.7.22172.16.7.23
7172.16.7.24/30172.16.7.25 – 172.16.7.26172.16.7.27
8172.16.7.28/30172.16.7.29 – 172.16.7.30172.16.7.31
9172.16.7.32/30172.16.7.33 – 172.16.7.34172.16.7.35
10172.16.7.36/30172.16.7.37 – 172.16.7.38172.16.7.39
11172.16.7.40/30172.16.7.41 – 172.16.7.42172.16.7.43
12172.16.7.44/30172.16.7.45 – 172.16.7.46172.16.7.47
13172.16.7.48/30172.16.7.49 – 172.16.7.50172.16.7.51
14172.16.7.52/30172.16.7.53 – 172.16.7.54172.16.7.55
15172.16.7.56/30172.16.7.57 – 172.16.7.58172.16.7.59
16172.16.7.60/30172.16.7.61 – 172.16.7.62172.16.7.63
17172.16.7.64/30172.16.7.65 – 172.16.7.66172.16.7.67
18172.16.7.68/30172.16.7.69 – 172.16.7.70172.16.7.71
19172.16.7.72/30172.16.7.73 – 172.16.7.74172.16.7.75
20172.16.7.76/30172.16.7.77 – 172.16.7.78172.16.7.79
21172.16.7.80/30172.16.7.81 – 172.16.7.82172.16.7.83
22172.16.7.84/30172.16.7.85 – 172.16.7.86172.16.7.87
23172.16.7.88/30172.16.7.89 – 172.16.7.90172.16.7.91
24172.16.7.92/30172.16.7.93 – 172.16.7.94172.16.7.95
25172.16.7.96/30172.16.7.97 – 172.16.7.98172.16.7.99
26172.16.7.100/30172.16.7.101 – 172.16.7.102172.16.7.103
27172.16.7.104/30172.16.7.105 – 172.16.7.106172.16.7.107
28172.16.7.108/30172.16.7.109 – 172.16.7.110172.16.7.111
29172.16.7.112/30172.16.7.113 – 172.16.7.114172.16.7.115
30172.16.7.116/30172.16.7.117 – 172.16.7.118172.16.7.119
31172.16.7.120/30172.16.7.121 – 172.16.7.122172.16.7.123
32172.16.7.124/30172.16.7.125 – 172.16.7.126172.16.7.127
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 →