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.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)172.16.2.192/26

network172.16.2.192/26

broadcast172.16.2.255

first host172.16.2.193

last host172.16.2.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classB

ipcalc 172.16.2.192/26

address10101100.00010000.00000010.11000000

subnet mask11111111.11111111.11111111.11000000

network10101100.00010000.00000010.11000000

broadcast10101100.00010000.00000010.11111111

green = network part, grey = host part

hex0xac1002c0

decimal2886730432

reverse dns192.2.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:2c0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	172.16.2.192/32	172.16.2.192 – 172.16.2.192	172.16.2.192
2	172.16.2.193/32	172.16.2.193 – 172.16.2.193	172.16.2.193
3	172.16.2.194/32	172.16.2.194 – 172.16.2.194	172.16.2.194
4	172.16.2.195/32	172.16.2.195 – 172.16.2.195	172.16.2.195
5	172.16.2.196/32	172.16.2.196 – 172.16.2.196	172.16.2.196
6	172.16.2.197/32	172.16.2.197 – 172.16.2.197	172.16.2.197
7	172.16.2.198/32	172.16.2.198 – 172.16.2.198	172.16.2.198
8	172.16.2.199/32	172.16.2.199 – 172.16.2.199	172.16.2.199
9	172.16.2.200/32	172.16.2.200 – 172.16.2.200	172.16.2.200
10	172.16.2.201/32	172.16.2.201 – 172.16.2.201	172.16.2.201
11	172.16.2.202/32	172.16.2.202 – 172.16.2.202	172.16.2.202
12	172.16.2.203/32	172.16.2.203 – 172.16.2.203	172.16.2.203
13	172.16.2.204/32	172.16.2.204 – 172.16.2.204	172.16.2.204
14	172.16.2.205/32	172.16.2.205 – 172.16.2.205	172.16.2.205
15	172.16.2.206/32	172.16.2.206 – 172.16.2.206	172.16.2.206
16	172.16.2.207/32	172.16.2.207 – 172.16.2.207	172.16.2.207
17	172.16.2.208/32	172.16.2.208 – 172.16.2.208	172.16.2.208
18	172.16.2.209/32	172.16.2.209 – 172.16.2.209	172.16.2.209
19	172.16.2.210/32	172.16.2.210 – 172.16.2.210	172.16.2.210
20	172.16.2.211/32	172.16.2.211 – 172.16.2.211	172.16.2.211
21	172.16.2.212/32	172.16.2.212 – 172.16.2.212	172.16.2.212
22	172.16.2.213/32	172.16.2.213 – 172.16.2.213	172.16.2.213
23	172.16.2.214/32	172.16.2.214 – 172.16.2.214	172.16.2.214
24	172.16.2.215/32	172.16.2.215 – 172.16.2.215	172.16.2.215
25	172.16.2.216/32	172.16.2.216 – 172.16.2.216	172.16.2.216
26	172.16.2.217/32	172.16.2.217 – 172.16.2.217	172.16.2.217
27	172.16.2.218/32	172.16.2.218 – 172.16.2.218	172.16.2.218
28	172.16.2.219/32	172.16.2.219 – 172.16.2.219	172.16.2.219
29	172.16.2.220/32	172.16.2.220 – 172.16.2.220	172.16.2.220
30	172.16.2.221/32	172.16.2.221 – 172.16.2.221	172.16.2.221
31	172.16.2.222/32	172.16.2.222 – 172.16.2.222	172.16.2.222
32	172.16.2.223/32	172.16.2.223 – 172.16.2.223	172.16.2.223
33	172.16.2.224/32	172.16.2.224 – 172.16.2.224	172.16.2.224
34	172.16.2.225/32	172.16.2.225 – 172.16.2.225	172.16.2.225
35	172.16.2.226/32	172.16.2.226 – 172.16.2.226	172.16.2.226
36	172.16.2.227/32	172.16.2.227 – 172.16.2.227	172.16.2.227
37	172.16.2.228/32	172.16.2.228 – 172.16.2.228	172.16.2.228
38	172.16.2.229/32	172.16.2.229 – 172.16.2.229	172.16.2.229
39	172.16.2.230/32	172.16.2.230 – 172.16.2.230	172.16.2.230
40	172.16.2.231/32	172.16.2.231 – 172.16.2.231	172.16.2.231
41	172.16.2.232/32	172.16.2.232 – 172.16.2.232	172.16.2.232
42	172.16.2.233/32	172.16.2.233 – 172.16.2.233	172.16.2.233
43	172.16.2.234/32	172.16.2.234 – 172.16.2.234	172.16.2.234
44	172.16.2.235/32	172.16.2.235 – 172.16.2.235	172.16.2.235
45	172.16.2.236/32	172.16.2.236 – 172.16.2.236	172.16.2.236
46	172.16.2.237/32	172.16.2.237 – 172.16.2.237	172.16.2.237
47	172.16.2.238/32	172.16.2.238 – 172.16.2.238	172.16.2.238
48	172.16.2.239/32	172.16.2.239 – 172.16.2.239	172.16.2.239
49	172.16.2.240/32	172.16.2.240 – 172.16.2.240	172.16.2.240
50	172.16.2.241/32	172.16.2.241 – 172.16.2.241	172.16.2.241
51	172.16.2.242/32	172.16.2.242 – 172.16.2.242	172.16.2.242
52	172.16.2.243/32	172.16.2.243 – 172.16.2.243	172.16.2.243
53	172.16.2.244/32	172.16.2.244 – 172.16.2.244	172.16.2.244
54	172.16.2.245/32	172.16.2.245 – 172.16.2.245	172.16.2.245
55	172.16.2.246/32	172.16.2.246 – 172.16.2.246	172.16.2.246
56	172.16.2.247/32	172.16.2.247 – 172.16.2.247	172.16.2.247
57	172.16.2.248/32	172.16.2.248 – 172.16.2.248	172.16.2.248
58	172.16.2.249/32	172.16.2.249 – 172.16.2.249	172.16.2.249
59	172.16.2.250/32	172.16.2.250 – 172.16.2.250	172.16.2.250
60	172.16.2.251/32	172.16.2.251 – 172.16.2.251	172.16.2.251
61	172.16.2.252/32	172.16.2.252 – 172.16.2.252	172.16.2.252
62	172.16.2.253/32	172.16.2.253 – 172.16.2.253	172.16.2.253
63	172.16.2.254/32	172.16.2.254 – 172.16.2.254	172.16.2.254
64	172.16.2.255/32	172.16.2.255 – 172.16.2.255	172.16.2.255

01 / table

IPv4 CIDR prefix table.

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

prefix	subnet mask	addresses	hosts	in your /26
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 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 →