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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)10.2.151.192/27
network10.2.151.192/27
broadcast10.2.151.223
first host10.2.151.193
last host10.2.151.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.2.151.192/27
address00001010.00000010.10010111.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000010.10010111.11000000
broadcast00001010.00000010.10010111.11011111
green = network part, grey = host part
hex0x0a0297c0
decimal167942080
reverse dns192.151.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:97c0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.151.192/3210.2.151.192 – 10.2.151.19210.2.151.192
210.2.151.193/3210.2.151.193 – 10.2.151.19310.2.151.193
310.2.151.194/3210.2.151.194 – 10.2.151.19410.2.151.194
410.2.151.195/3210.2.151.195 – 10.2.151.19510.2.151.195
510.2.151.196/3210.2.151.196 – 10.2.151.19610.2.151.196
610.2.151.197/3210.2.151.197 – 10.2.151.19710.2.151.197
710.2.151.198/3210.2.151.198 – 10.2.151.19810.2.151.198
810.2.151.199/3210.2.151.199 – 10.2.151.19910.2.151.199
910.2.151.200/3210.2.151.200 – 10.2.151.20010.2.151.200
1010.2.151.201/3210.2.151.201 – 10.2.151.20110.2.151.201
1110.2.151.202/3210.2.151.202 – 10.2.151.20210.2.151.202
1210.2.151.203/3210.2.151.203 – 10.2.151.20310.2.151.203
1310.2.151.204/3210.2.151.204 – 10.2.151.20410.2.151.204
1410.2.151.205/3210.2.151.205 – 10.2.151.20510.2.151.205
1510.2.151.206/3210.2.151.206 – 10.2.151.20610.2.151.206
1610.2.151.207/3210.2.151.207 – 10.2.151.20710.2.151.207
1710.2.151.208/3210.2.151.208 – 10.2.151.20810.2.151.208
1810.2.151.209/3210.2.151.209 – 10.2.151.20910.2.151.209
1910.2.151.210/3210.2.151.210 – 10.2.151.21010.2.151.210
2010.2.151.211/3210.2.151.211 – 10.2.151.21110.2.151.211
2110.2.151.212/3210.2.151.212 – 10.2.151.21210.2.151.212
2210.2.151.213/3210.2.151.213 – 10.2.151.21310.2.151.213
2310.2.151.214/3210.2.151.214 – 10.2.151.21410.2.151.214
2410.2.151.215/3210.2.151.215 – 10.2.151.21510.2.151.215
2510.2.151.216/3210.2.151.216 – 10.2.151.21610.2.151.216
2610.2.151.217/3210.2.151.217 – 10.2.151.21710.2.151.217
2710.2.151.218/3210.2.151.218 – 10.2.151.21810.2.151.218
2810.2.151.219/3210.2.151.219 – 10.2.151.21910.2.151.219
2910.2.151.220/3210.2.151.220 – 10.2.151.22010.2.151.220
3010.2.151.221/3210.2.151.221 – 10.2.151.22110.2.151.221
3110.2.151.222/3210.2.151.222 – 10.2.151.22210.2.151.222
3210.2.151.223/3210.2.151.223 – 10.2.151.22310.2.151.223
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 →