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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)10.45.3.0/26
network10.45.3.0/26
broadcast10.45.3.63
first host10.45.3.1
last host10.45.3.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.45.3.0/26
address00001010.00101101.00000011.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00101101.00000011.00000000
broadcast00001010.00101101.00000011.00111111
green = network part, grey = host part
hex0x0a2d0300
decimal170722048
reverse dns0.3.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:300

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.3.0/3210.45.3.0 – 10.45.3.010.45.3.0
210.45.3.1/3210.45.3.1 – 10.45.3.110.45.3.1
310.45.3.2/3210.45.3.2 – 10.45.3.210.45.3.2
410.45.3.3/3210.45.3.3 – 10.45.3.310.45.3.3
510.45.3.4/3210.45.3.4 – 10.45.3.410.45.3.4
610.45.3.5/3210.45.3.5 – 10.45.3.510.45.3.5
710.45.3.6/3210.45.3.6 – 10.45.3.610.45.3.6
810.45.3.7/3210.45.3.7 – 10.45.3.710.45.3.7
910.45.3.8/3210.45.3.8 – 10.45.3.810.45.3.8
1010.45.3.9/3210.45.3.9 – 10.45.3.910.45.3.9
1110.45.3.10/3210.45.3.10 – 10.45.3.1010.45.3.10
1210.45.3.11/3210.45.3.11 – 10.45.3.1110.45.3.11
1310.45.3.12/3210.45.3.12 – 10.45.3.1210.45.3.12
1410.45.3.13/3210.45.3.13 – 10.45.3.1310.45.3.13
1510.45.3.14/3210.45.3.14 – 10.45.3.1410.45.3.14
1610.45.3.15/3210.45.3.15 – 10.45.3.1510.45.3.15
1710.45.3.16/3210.45.3.16 – 10.45.3.1610.45.3.16
1810.45.3.17/3210.45.3.17 – 10.45.3.1710.45.3.17
1910.45.3.18/3210.45.3.18 – 10.45.3.1810.45.3.18
2010.45.3.19/3210.45.3.19 – 10.45.3.1910.45.3.19
2110.45.3.20/3210.45.3.20 – 10.45.3.2010.45.3.20
2210.45.3.21/3210.45.3.21 – 10.45.3.2110.45.3.21
2310.45.3.22/3210.45.3.22 – 10.45.3.2210.45.3.22
2410.45.3.23/3210.45.3.23 – 10.45.3.2310.45.3.23
2510.45.3.24/3210.45.3.24 – 10.45.3.2410.45.3.24
2610.45.3.25/3210.45.3.25 – 10.45.3.2510.45.3.25
2710.45.3.26/3210.45.3.26 – 10.45.3.2610.45.3.26
2810.45.3.27/3210.45.3.27 – 10.45.3.2710.45.3.27
2910.45.3.28/3210.45.3.28 – 10.45.3.2810.45.3.28
3010.45.3.29/3210.45.3.29 – 10.45.3.2910.45.3.29
3110.45.3.30/3210.45.3.30 – 10.45.3.3010.45.3.30
3210.45.3.31/3210.45.3.31 – 10.45.3.3110.45.3.31
3310.45.3.32/3210.45.3.32 – 10.45.3.3210.45.3.32
3410.45.3.33/3210.45.3.33 – 10.45.3.3310.45.3.33
3510.45.3.34/3210.45.3.34 – 10.45.3.3410.45.3.34
3610.45.3.35/3210.45.3.35 – 10.45.3.3510.45.3.35
3710.45.3.36/3210.45.3.36 – 10.45.3.3610.45.3.36
3810.45.3.37/3210.45.3.37 – 10.45.3.3710.45.3.37
3910.45.3.38/3210.45.3.38 – 10.45.3.3810.45.3.38
4010.45.3.39/3210.45.3.39 – 10.45.3.3910.45.3.39
4110.45.3.40/3210.45.3.40 – 10.45.3.4010.45.3.40
4210.45.3.41/3210.45.3.41 – 10.45.3.4110.45.3.41
4310.45.3.42/3210.45.3.42 – 10.45.3.4210.45.3.42
4410.45.3.43/3210.45.3.43 – 10.45.3.4310.45.3.43
4510.45.3.44/3210.45.3.44 – 10.45.3.4410.45.3.44
4610.45.3.45/3210.45.3.45 – 10.45.3.4510.45.3.45
4710.45.3.46/3210.45.3.46 – 10.45.3.4610.45.3.46
4810.45.3.47/3210.45.3.47 – 10.45.3.4710.45.3.47
4910.45.3.48/3210.45.3.48 – 10.45.3.4810.45.3.48
5010.45.3.49/3210.45.3.49 – 10.45.3.4910.45.3.49
5110.45.3.50/3210.45.3.50 – 10.45.3.5010.45.3.50
5210.45.3.51/3210.45.3.51 – 10.45.3.5110.45.3.51
5310.45.3.52/3210.45.3.52 – 10.45.3.5210.45.3.52
5410.45.3.53/3210.45.3.53 – 10.45.3.5310.45.3.53
5510.45.3.54/3210.45.3.54 – 10.45.3.5410.45.3.54
5610.45.3.55/3210.45.3.55 – 10.45.3.5510.45.3.55
5710.45.3.56/3210.45.3.56 – 10.45.3.5610.45.3.56
5810.45.3.57/3210.45.3.57 – 10.45.3.5710.45.3.57
5910.45.3.58/3210.45.3.58 – 10.45.3.5810.45.3.58
6010.45.3.59/3210.45.3.59 – 10.45.3.5910.45.3.59
6110.45.3.60/3210.45.3.60 – 10.45.3.6010.45.3.60
6210.45.3.61/3210.45.3.61 – 10.45.3.6110.45.3.61
6310.45.3.62/3210.45.3.62 – 10.45.3.6210.45.3.62
6410.45.3.63/3210.45.3.63 – 10.45.3.6310.45.3.63
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /26
/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-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →