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)10.78.187.64/27
network10.78.187.64/27
broadcast10.78.187.95
first host10.78.187.65
last host10.78.187.94
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.78.187.64/27
address00001010.01001110.10111011.01000000
subnet mask11111111.11111111.11111111.11100000
network00001010.01001110.10111011.01000000
broadcast00001010.01001110.10111011.01011111
green = network part, grey = host part
hex0x0a4ebb40
decimal172931904
reverse dns64.187.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:bb40

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.187.64/3210.78.187.64 – 10.78.187.6410.78.187.64
210.78.187.65/3210.78.187.65 – 10.78.187.6510.78.187.65
310.78.187.66/3210.78.187.66 – 10.78.187.6610.78.187.66
410.78.187.67/3210.78.187.67 – 10.78.187.6710.78.187.67
510.78.187.68/3210.78.187.68 – 10.78.187.6810.78.187.68
610.78.187.69/3210.78.187.69 – 10.78.187.6910.78.187.69
710.78.187.70/3210.78.187.70 – 10.78.187.7010.78.187.70
810.78.187.71/3210.78.187.71 – 10.78.187.7110.78.187.71
910.78.187.72/3210.78.187.72 – 10.78.187.7210.78.187.72
1010.78.187.73/3210.78.187.73 – 10.78.187.7310.78.187.73
1110.78.187.74/3210.78.187.74 – 10.78.187.7410.78.187.74
1210.78.187.75/3210.78.187.75 – 10.78.187.7510.78.187.75
1310.78.187.76/3210.78.187.76 – 10.78.187.7610.78.187.76
1410.78.187.77/3210.78.187.77 – 10.78.187.7710.78.187.77
1510.78.187.78/3210.78.187.78 – 10.78.187.7810.78.187.78
1610.78.187.79/3210.78.187.79 – 10.78.187.7910.78.187.79
1710.78.187.80/3210.78.187.80 – 10.78.187.8010.78.187.80
1810.78.187.81/3210.78.187.81 – 10.78.187.8110.78.187.81
1910.78.187.82/3210.78.187.82 – 10.78.187.8210.78.187.82
2010.78.187.83/3210.78.187.83 – 10.78.187.8310.78.187.83
2110.78.187.84/3210.78.187.84 – 10.78.187.8410.78.187.84
2210.78.187.85/3210.78.187.85 – 10.78.187.8510.78.187.85
2310.78.187.86/3210.78.187.86 – 10.78.187.8610.78.187.86
2410.78.187.87/3210.78.187.87 – 10.78.187.8710.78.187.87
2510.78.187.88/3210.78.187.88 – 10.78.187.8810.78.187.88
2610.78.187.89/3210.78.187.89 – 10.78.187.8910.78.187.89
2710.78.187.90/3210.78.187.90 – 10.78.187.9010.78.187.90
2810.78.187.91/3210.78.187.91 – 10.78.187.9110.78.187.91
2910.78.187.92/3210.78.187.92 – 10.78.187.9210.78.187.92
3010.78.187.93/3210.78.187.93 – 10.78.187.9310.78.187.93
3110.78.187.94/3210.78.187.94 – 10.78.187.9410.78.187.94
3210.78.187.95/3210.78.187.95 – 10.78.187.9510.78.187.95
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /27
/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-
/26255.255.255.1926462-
/27255.255.255.22432301
/28255.255.255.24016142 split →
/29255.255.255.248864 split →
/30255.255.255.252428 split →
/31255.255.255.2542216 split →
/32255.255.255.2551132 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 →