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)10.2.91.192/26

network10.2.91.192/26

broadcast10.2.91.255

first host10.2.91.193

last host10.2.91.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.91.192/26

address00001010.00000010.01011011.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.01011011.11000000

broadcast00001010.00000010.01011011.11111111

green = network part, grey = host part

hex0x0a025bc0

decimal167926720

reverse dns192.91.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:5bc0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.91.192/32	10.2.91.192 – 10.2.91.192	10.2.91.192
2	10.2.91.193/32	10.2.91.193 – 10.2.91.193	10.2.91.193
3	10.2.91.194/32	10.2.91.194 – 10.2.91.194	10.2.91.194
4	10.2.91.195/32	10.2.91.195 – 10.2.91.195	10.2.91.195
5	10.2.91.196/32	10.2.91.196 – 10.2.91.196	10.2.91.196
6	10.2.91.197/32	10.2.91.197 – 10.2.91.197	10.2.91.197
7	10.2.91.198/32	10.2.91.198 – 10.2.91.198	10.2.91.198
8	10.2.91.199/32	10.2.91.199 – 10.2.91.199	10.2.91.199
9	10.2.91.200/32	10.2.91.200 – 10.2.91.200	10.2.91.200
10	10.2.91.201/32	10.2.91.201 – 10.2.91.201	10.2.91.201
11	10.2.91.202/32	10.2.91.202 – 10.2.91.202	10.2.91.202
12	10.2.91.203/32	10.2.91.203 – 10.2.91.203	10.2.91.203
13	10.2.91.204/32	10.2.91.204 – 10.2.91.204	10.2.91.204
14	10.2.91.205/32	10.2.91.205 – 10.2.91.205	10.2.91.205
15	10.2.91.206/32	10.2.91.206 – 10.2.91.206	10.2.91.206
16	10.2.91.207/32	10.2.91.207 – 10.2.91.207	10.2.91.207
17	10.2.91.208/32	10.2.91.208 – 10.2.91.208	10.2.91.208
18	10.2.91.209/32	10.2.91.209 – 10.2.91.209	10.2.91.209
19	10.2.91.210/32	10.2.91.210 – 10.2.91.210	10.2.91.210
20	10.2.91.211/32	10.2.91.211 – 10.2.91.211	10.2.91.211
21	10.2.91.212/32	10.2.91.212 – 10.2.91.212	10.2.91.212
22	10.2.91.213/32	10.2.91.213 – 10.2.91.213	10.2.91.213
23	10.2.91.214/32	10.2.91.214 – 10.2.91.214	10.2.91.214
24	10.2.91.215/32	10.2.91.215 – 10.2.91.215	10.2.91.215
25	10.2.91.216/32	10.2.91.216 – 10.2.91.216	10.2.91.216
26	10.2.91.217/32	10.2.91.217 – 10.2.91.217	10.2.91.217
27	10.2.91.218/32	10.2.91.218 – 10.2.91.218	10.2.91.218
28	10.2.91.219/32	10.2.91.219 – 10.2.91.219	10.2.91.219
29	10.2.91.220/32	10.2.91.220 – 10.2.91.220	10.2.91.220
30	10.2.91.221/32	10.2.91.221 – 10.2.91.221	10.2.91.221
31	10.2.91.222/32	10.2.91.222 – 10.2.91.222	10.2.91.222
32	10.2.91.223/32	10.2.91.223 – 10.2.91.223	10.2.91.223
33	10.2.91.224/32	10.2.91.224 – 10.2.91.224	10.2.91.224
34	10.2.91.225/32	10.2.91.225 – 10.2.91.225	10.2.91.225
35	10.2.91.226/32	10.2.91.226 – 10.2.91.226	10.2.91.226
36	10.2.91.227/32	10.2.91.227 – 10.2.91.227	10.2.91.227
37	10.2.91.228/32	10.2.91.228 – 10.2.91.228	10.2.91.228
38	10.2.91.229/32	10.2.91.229 – 10.2.91.229	10.2.91.229
39	10.2.91.230/32	10.2.91.230 – 10.2.91.230	10.2.91.230
40	10.2.91.231/32	10.2.91.231 – 10.2.91.231	10.2.91.231
41	10.2.91.232/32	10.2.91.232 – 10.2.91.232	10.2.91.232
42	10.2.91.233/32	10.2.91.233 – 10.2.91.233	10.2.91.233
43	10.2.91.234/32	10.2.91.234 – 10.2.91.234	10.2.91.234
44	10.2.91.235/32	10.2.91.235 – 10.2.91.235	10.2.91.235
45	10.2.91.236/32	10.2.91.236 – 10.2.91.236	10.2.91.236
46	10.2.91.237/32	10.2.91.237 – 10.2.91.237	10.2.91.237
47	10.2.91.238/32	10.2.91.238 – 10.2.91.238	10.2.91.238
48	10.2.91.239/32	10.2.91.239 – 10.2.91.239	10.2.91.239
49	10.2.91.240/32	10.2.91.240 – 10.2.91.240	10.2.91.240
50	10.2.91.241/32	10.2.91.241 – 10.2.91.241	10.2.91.241
51	10.2.91.242/32	10.2.91.242 – 10.2.91.242	10.2.91.242
52	10.2.91.243/32	10.2.91.243 – 10.2.91.243	10.2.91.243
53	10.2.91.244/32	10.2.91.244 – 10.2.91.244	10.2.91.244
54	10.2.91.245/32	10.2.91.245 – 10.2.91.245	10.2.91.245
55	10.2.91.246/32	10.2.91.246 – 10.2.91.246	10.2.91.246
56	10.2.91.247/32	10.2.91.247 – 10.2.91.247	10.2.91.247
57	10.2.91.248/32	10.2.91.248 – 10.2.91.248	10.2.91.248
58	10.2.91.249/32	10.2.91.249 – 10.2.91.249	10.2.91.249
59	10.2.91.250/32	10.2.91.250 – 10.2.91.250	10.2.91.250
60	10.2.91.251/32	10.2.91.251 – 10.2.91.251	10.2.91.251
61	10.2.91.252/32	10.2.91.252 – 10.2.91.252	10.2.91.252
62	10.2.91.253/32	10.2.91.253 – 10.2.91.253	10.2.91.253
63	10.2.91.254/32	10.2.91.254 – 10.2.91.254	10.2.91.254
64	10.2.91.255/32	10.2.91.255 – 10.2.91.255	10.2.91.255

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 →