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)10.2.192.192/26

network10.2.192.192/26

broadcast10.2.192.255

first host10.2.192.193

last host10.2.192.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.192.192/26

address00001010.00000010.11000000.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.11000000.11000000

broadcast00001010.00000010.11000000.11111111

green = network part, grey = host part

hex0x0a02c0c0

decimal167952576

reverse dns192.192.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c0c0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.192.192/32	10.2.192.192 – 10.2.192.192	10.2.192.192
2	10.2.192.193/32	10.2.192.193 – 10.2.192.193	10.2.192.193
3	10.2.192.194/32	10.2.192.194 – 10.2.192.194	10.2.192.194
4	10.2.192.195/32	10.2.192.195 – 10.2.192.195	10.2.192.195
5	10.2.192.196/32	10.2.192.196 – 10.2.192.196	10.2.192.196
6	10.2.192.197/32	10.2.192.197 – 10.2.192.197	10.2.192.197
7	10.2.192.198/32	10.2.192.198 – 10.2.192.198	10.2.192.198
8	10.2.192.199/32	10.2.192.199 – 10.2.192.199	10.2.192.199
9	10.2.192.200/32	10.2.192.200 – 10.2.192.200	10.2.192.200
10	10.2.192.201/32	10.2.192.201 – 10.2.192.201	10.2.192.201
11	10.2.192.202/32	10.2.192.202 – 10.2.192.202	10.2.192.202
12	10.2.192.203/32	10.2.192.203 – 10.2.192.203	10.2.192.203
13	10.2.192.204/32	10.2.192.204 – 10.2.192.204	10.2.192.204
14	10.2.192.205/32	10.2.192.205 – 10.2.192.205	10.2.192.205
15	10.2.192.206/32	10.2.192.206 – 10.2.192.206	10.2.192.206
16	10.2.192.207/32	10.2.192.207 – 10.2.192.207	10.2.192.207
17	10.2.192.208/32	10.2.192.208 – 10.2.192.208	10.2.192.208
18	10.2.192.209/32	10.2.192.209 – 10.2.192.209	10.2.192.209
19	10.2.192.210/32	10.2.192.210 – 10.2.192.210	10.2.192.210
20	10.2.192.211/32	10.2.192.211 – 10.2.192.211	10.2.192.211
21	10.2.192.212/32	10.2.192.212 – 10.2.192.212	10.2.192.212
22	10.2.192.213/32	10.2.192.213 – 10.2.192.213	10.2.192.213
23	10.2.192.214/32	10.2.192.214 – 10.2.192.214	10.2.192.214
24	10.2.192.215/32	10.2.192.215 – 10.2.192.215	10.2.192.215
25	10.2.192.216/32	10.2.192.216 – 10.2.192.216	10.2.192.216
26	10.2.192.217/32	10.2.192.217 – 10.2.192.217	10.2.192.217
27	10.2.192.218/32	10.2.192.218 – 10.2.192.218	10.2.192.218
28	10.2.192.219/32	10.2.192.219 – 10.2.192.219	10.2.192.219
29	10.2.192.220/32	10.2.192.220 – 10.2.192.220	10.2.192.220
30	10.2.192.221/32	10.2.192.221 – 10.2.192.221	10.2.192.221
31	10.2.192.222/32	10.2.192.222 – 10.2.192.222	10.2.192.222
32	10.2.192.223/32	10.2.192.223 – 10.2.192.223	10.2.192.223
33	10.2.192.224/32	10.2.192.224 – 10.2.192.224	10.2.192.224
34	10.2.192.225/32	10.2.192.225 – 10.2.192.225	10.2.192.225
35	10.2.192.226/32	10.2.192.226 – 10.2.192.226	10.2.192.226
36	10.2.192.227/32	10.2.192.227 – 10.2.192.227	10.2.192.227
37	10.2.192.228/32	10.2.192.228 – 10.2.192.228	10.2.192.228
38	10.2.192.229/32	10.2.192.229 – 10.2.192.229	10.2.192.229
39	10.2.192.230/32	10.2.192.230 – 10.2.192.230	10.2.192.230
40	10.2.192.231/32	10.2.192.231 – 10.2.192.231	10.2.192.231
41	10.2.192.232/32	10.2.192.232 – 10.2.192.232	10.2.192.232
42	10.2.192.233/32	10.2.192.233 – 10.2.192.233	10.2.192.233
43	10.2.192.234/32	10.2.192.234 – 10.2.192.234	10.2.192.234
44	10.2.192.235/32	10.2.192.235 – 10.2.192.235	10.2.192.235
45	10.2.192.236/32	10.2.192.236 – 10.2.192.236	10.2.192.236
46	10.2.192.237/32	10.2.192.237 – 10.2.192.237	10.2.192.237
47	10.2.192.238/32	10.2.192.238 – 10.2.192.238	10.2.192.238
48	10.2.192.239/32	10.2.192.239 – 10.2.192.239	10.2.192.239
49	10.2.192.240/32	10.2.192.240 – 10.2.192.240	10.2.192.240
50	10.2.192.241/32	10.2.192.241 – 10.2.192.241	10.2.192.241
51	10.2.192.242/32	10.2.192.242 – 10.2.192.242	10.2.192.242
52	10.2.192.243/32	10.2.192.243 – 10.2.192.243	10.2.192.243
53	10.2.192.244/32	10.2.192.244 – 10.2.192.244	10.2.192.244
54	10.2.192.245/32	10.2.192.245 – 10.2.192.245	10.2.192.245
55	10.2.192.246/32	10.2.192.246 – 10.2.192.246	10.2.192.246
56	10.2.192.247/32	10.2.192.247 – 10.2.192.247	10.2.192.247
57	10.2.192.248/32	10.2.192.248 – 10.2.192.248	10.2.192.248
58	10.2.192.249/32	10.2.192.249 – 10.2.192.249	10.2.192.249
59	10.2.192.250/32	10.2.192.250 – 10.2.192.250	10.2.192.250
60	10.2.192.251/32	10.2.192.251 – 10.2.192.251	10.2.192.251
61	10.2.192.252/32	10.2.192.252 – 10.2.192.252	10.2.192.252
62	10.2.192.253/32	10.2.192.253 – 10.2.192.253	10.2.192.253
63	10.2.192.254/32	10.2.192.254 – 10.2.192.254	10.2.192.254
64	10.2.192.255/32	10.2.192.255 – 10.2.192.255	10.2.192.255

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 →