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)10.4.78.192/26

network10.4.78.192/26

broadcast10.4.78.255

first host10.4.78.193

last host10.4.78.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.4.78.192/26

address00001010.00000100.01001110.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000100.01001110.11000000

broadcast00001010.00000100.01001110.11111111

green = network part, grey = host part

hex0x0a044ec0

decimal168054464

reverse dns192.78.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:4ec0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.78.192/32	10.4.78.192 – 10.4.78.192	10.4.78.192
2	10.4.78.193/32	10.4.78.193 – 10.4.78.193	10.4.78.193
3	10.4.78.194/32	10.4.78.194 – 10.4.78.194	10.4.78.194
4	10.4.78.195/32	10.4.78.195 – 10.4.78.195	10.4.78.195
5	10.4.78.196/32	10.4.78.196 – 10.4.78.196	10.4.78.196
6	10.4.78.197/32	10.4.78.197 – 10.4.78.197	10.4.78.197
7	10.4.78.198/32	10.4.78.198 – 10.4.78.198	10.4.78.198
8	10.4.78.199/32	10.4.78.199 – 10.4.78.199	10.4.78.199
9	10.4.78.200/32	10.4.78.200 – 10.4.78.200	10.4.78.200
10	10.4.78.201/32	10.4.78.201 – 10.4.78.201	10.4.78.201
11	10.4.78.202/32	10.4.78.202 – 10.4.78.202	10.4.78.202
12	10.4.78.203/32	10.4.78.203 – 10.4.78.203	10.4.78.203
13	10.4.78.204/32	10.4.78.204 – 10.4.78.204	10.4.78.204
14	10.4.78.205/32	10.4.78.205 – 10.4.78.205	10.4.78.205
15	10.4.78.206/32	10.4.78.206 – 10.4.78.206	10.4.78.206
16	10.4.78.207/32	10.4.78.207 – 10.4.78.207	10.4.78.207
17	10.4.78.208/32	10.4.78.208 – 10.4.78.208	10.4.78.208
18	10.4.78.209/32	10.4.78.209 – 10.4.78.209	10.4.78.209
19	10.4.78.210/32	10.4.78.210 – 10.4.78.210	10.4.78.210
20	10.4.78.211/32	10.4.78.211 – 10.4.78.211	10.4.78.211
21	10.4.78.212/32	10.4.78.212 – 10.4.78.212	10.4.78.212
22	10.4.78.213/32	10.4.78.213 – 10.4.78.213	10.4.78.213
23	10.4.78.214/32	10.4.78.214 – 10.4.78.214	10.4.78.214
24	10.4.78.215/32	10.4.78.215 – 10.4.78.215	10.4.78.215
25	10.4.78.216/32	10.4.78.216 – 10.4.78.216	10.4.78.216
26	10.4.78.217/32	10.4.78.217 – 10.4.78.217	10.4.78.217
27	10.4.78.218/32	10.4.78.218 – 10.4.78.218	10.4.78.218
28	10.4.78.219/32	10.4.78.219 – 10.4.78.219	10.4.78.219
29	10.4.78.220/32	10.4.78.220 – 10.4.78.220	10.4.78.220
30	10.4.78.221/32	10.4.78.221 – 10.4.78.221	10.4.78.221
31	10.4.78.222/32	10.4.78.222 – 10.4.78.222	10.4.78.222
32	10.4.78.223/32	10.4.78.223 – 10.4.78.223	10.4.78.223
33	10.4.78.224/32	10.4.78.224 – 10.4.78.224	10.4.78.224
34	10.4.78.225/32	10.4.78.225 – 10.4.78.225	10.4.78.225
35	10.4.78.226/32	10.4.78.226 – 10.4.78.226	10.4.78.226
36	10.4.78.227/32	10.4.78.227 – 10.4.78.227	10.4.78.227
37	10.4.78.228/32	10.4.78.228 – 10.4.78.228	10.4.78.228
38	10.4.78.229/32	10.4.78.229 – 10.4.78.229	10.4.78.229
39	10.4.78.230/32	10.4.78.230 – 10.4.78.230	10.4.78.230
40	10.4.78.231/32	10.4.78.231 – 10.4.78.231	10.4.78.231
41	10.4.78.232/32	10.4.78.232 – 10.4.78.232	10.4.78.232
42	10.4.78.233/32	10.4.78.233 – 10.4.78.233	10.4.78.233
43	10.4.78.234/32	10.4.78.234 – 10.4.78.234	10.4.78.234
44	10.4.78.235/32	10.4.78.235 – 10.4.78.235	10.4.78.235
45	10.4.78.236/32	10.4.78.236 – 10.4.78.236	10.4.78.236
46	10.4.78.237/32	10.4.78.237 – 10.4.78.237	10.4.78.237
47	10.4.78.238/32	10.4.78.238 – 10.4.78.238	10.4.78.238
48	10.4.78.239/32	10.4.78.239 – 10.4.78.239	10.4.78.239
49	10.4.78.240/32	10.4.78.240 – 10.4.78.240	10.4.78.240
50	10.4.78.241/32	10.4.78.241 – 10.4.78.241	10.4.78.241
51	10.4.78.242/32	10.4.78.242 – 10.4.78.242	10.4.78.242
52	10.4.78.243/32	10.4.78.243 – 10.4.78.243	10.4.78.243
53	10.4.78.244/32	10.4.78.244 – 10.4.78.244	10.4.78.244
54	10.4.78.245/32	10.4.78.245 – 10.4.78.245	10.4.78.245
55	10.4.78.246/32	10.4.78.246 – 10.4.78.246	10.4.78.246
56	10.4.78.247/32	10.4.78.247 – 10.4.78.247	10.4.78.247
57	10.4.78.248/32	10.4.78.248 – 10.4.78.248	10.4.78.248
58	10.4.78.249/32	10.4.78.249 – 10.4.78.249	10.4.78.249
59	10.4.78.250/32	10.4.78.250 – 10.4.78.250	10.4.78.250
60	10.4.78.251/32	10.4.78.251 – 10.4.78.251	10.4.78.251
61	10.4.78.252/32	10.4.78.252 – 10.4.78.252	10.4.78.252
62	10.4.78.253/32	10.4.78.253 – 10.4.78.253	10.4.78.253
63	10.4.78.254/32	10.4.78.254 – 10.4.78.254	10.4.78.254
64	10.4.78.255/32	10.4.78.255 – 10.4.78.255	10.4.78.255

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 →