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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)10.76.4.192/27
network10.76.4.192/27
broadcast10.76.4.223
first host10.76.4.193
last host10.76.4.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.76.4.192/27
address00001010.01001100.00000100.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.01001100.00000100.11000000
broadcast00001010.01001100.00000100.11011111
green = network part, grey = host part
hex0x0a4c04c0
decimal172754112
reverse dns192.4.76.10.in-addr.arpa
ipv4-mapped::ffff:a4c:4c0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.76.4.192/3210.76.4.192 – 10.76.4.19210.76.4.192
210.76.4.193/3210.76.4.193 – 10.76.4.19310.76.4.193
310.76.4.194/3210.76.4.194 – 10.76.4.19410.76.4.194
410.76.4.195/3210.76.4.195 – 10.76.4.19510.76.4.195
510.76.4.196/3210.76.4.196 – 10.76.4.19610.76.4.196
610.76.4.197/3210.76.4.197 – 10.76.4.19710.76.4.197
710.76.4.198/3210.76.4.198 – 10.76.4.19810.76.4.198
810.76.4.199/3210.76.4.199 – 10.76.4.19910.76.4.199
910.76.4.200/3210.76.4.200 – 10.76.4.20010.76.4.200
1010.76.4.201/3210.76.4.201 – 10.76.4.20110.76.4.201
1110.76.4.202/3210.76.4.202 – 10.76.4.20210.76.4.202
1210.76.4.203/3210.76.4.203 – 10.76.4.20310.76.4.203
1310.76.4.204/3210.76.4.204 – 10.76.4.20410.76.4.204
1410.76.4.205/3210.76.4.205 – 10.76.4.20510.76.4.205
1510.76.4.206/3210.76.4.206 – 10.76.4.20610.76.4.206
1610.76.4.207/3210.76.4.207 – 10.76.4.20710.76.4.207
1710.76.4.208/3210.76.4.208 – 10.76.4.20810.76.4.208
1810.76.4.209/3210.76.4.209 – 10.76.4.20910.76.4.209
1910.76.4.210/3210.76.4.210 – 10.76.4.21010.76.4.210
2010.76.4.211/3210.76.4.211 – 10.76.4.21110.76.4.211
2110.76.4.212/3210.76.4.212 – 10.76.4.21210.76.4.212
2210.76.4.213/3210.76.4.213 – 10.76.4.21310.76.4.213
2310.76.4.214/3210.76.4.214 – 10.76.4.21410.76.4.214
2410.76.4.215/3210.76.4.215 – 10.76.4.21510.76.4.215
2510.76.4.216/3210.76.4.216 – 10.76.4.21610.76.4.216
2610.76.4.217/3210.76.4.217 – 10.76.4.21710.76.4.217
2710.76.4.218/3210.76.4.218 – 10.76.4.21810.76.4.218
2810.76.4.219/3210.76.4.219 – 10.76.4.21910.76.4.219
2910.76.4.220/3210.76.4.220 – 10.76.4.22010.76.4.220
3010.76.4.221/3210.76.4.221 – 10.76.4.22110.76.4.221
3110.76.4.222/3210.76.4.222 – 10.76.4.22210.76.4.222
3210.76.4.223/3210.76.4.223 – 10.76.4.22310.76.4.223
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 →