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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)10.0.11.192/27
network10.0.11.192/27
broadcast10.0.11.223
first host10.0.11.193
last host10.0.11.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.0.11.192/27
address00001010.00000000.00001011.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000000.00001011.11000000
broadcast00001010.00000000.00001011.11011111
green = network part, grey = host part
hex0x0a000bc0
decimal167775168
reverse dns192.11.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:bc0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.11.192/3210.0.11.192 – 10.0.11.19210.0.11.192
210.0.11.193/3210.0.11.193 – 10.0.11.19310.0.11.193
310.0.11.194/3210.0.11.194 – 10.0.11.19410.0.11.194
410.0.11.195/3210.0.11.195 – 10.0.11.19510.0.11.195
510.0.11.196/3210.0.11.196 – 10.0.11.19610.0.11.196
610.0.11.197/3210.0.11.197 – 10.0.11.19710.0.11.197
710.0.11.198/3210.0.11.198 – 10.0.11.19810.0.11.198
810.0.11.199/3210.0.11.199 – 10.0.11.19910.0.11.199
910.0.11.200/3210.0.11.200 – 10.0.11.20010.0.11.200
1010.0.11.201/3210.0.11.201 – 10.0.11.20110.0.11.201
1110.0.11.202/3210.0.11.202 – 10.0.11.20210.0.11.202
1210.0.11.203/3210.0.11.203 – 10.0.11.20310.0.11.203
1310.0.11.204/3210.0.11.204 – 10.0.11.20410.0.11.204
1410.0.11.205/3210.0.11.205 – 10.0.11.20510.0.11.205
1510.0.11.206/3210.0.11.206 – 10.0.11.20610.0.11.206
1610.0.11.207/3210.0.11.207 – 10.0.11.20710.0.11.207
1710.0.11.208/3210.0.11.208 – 10.0.11.20810.0.11.208
1810.0.11.209/3210.0.11.209 – 10.0.11.20910.0.11.209
1910.0.11.210/3210.0.11.210 – 10.0.11.21010.0.11.210
2010.0.11.211/3210.0.11.211 – 10.0.11.21110.0.11.211
2110.0.11.212/3210.0.11.212 – 10.0.11.21210.0.11.212
2210.0.11.213/3210.0.11.213 – 10.0.11.21310.0.11.213
2310.0.11.214/3210.0.11.214 – 10.0.11.21410.0.11.214
2410.0.11.215/3210.0.11.215 – 10.0.11.21510.0.11.215
2510.0.11.216/3210.0.11.216 – 10.0.11.21610.0.11.216
2610.0.11.217/3210.0.11.217 – 10.0.11.21710.0.11.217
2710.0.11.218/3210.0.11.218 – 10.0.11.21810.0.11.218
2810.0.11.219/3210.0.11.219 – 10.0.11.21910.0.11.219
2910.0.11.220/3210.0.11.220 – 10.0.11.22010.0.11.220
3010.0.11.221/3210.0.11.221 – 10.0.11.22110.0.11.221
3110.0.11.222/3210.0.11.222 – 10.0.11.22210.0.11.222
3210.0.11.223/3210.0.11.223 – 10.0.11.22310.0.11.223
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 →