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)10.2.17.192/26

network10.2.17.192/26

broadcast10.2.17.255

first host10.2.17.193

last host10.2.17.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.17.192/26

address00001010.00000010.00010001.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.00010001.11000000

broadcast00001010.00000010.00010001.11111111

green = network part, grey = host part

hex0x0a0211c0

decimal167907776

reverse dns192.17.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:11c0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.17.192/32	10.2.17.192 – 10.2.17.192	10.2.17.192
2	10.2.17.193/32	10.2.17.193 – 10.2.17.193	10.2.17.193
3	10.2.17.194/32	10.2.17.194 – 10.2.17.194	10.2.17.194
4	10.2.17.195/32	10.2.17.195 – 10.2.17.195	10.2.17.195
5	10.2.17.196/32	10.2.17.196 – 10.2.17.196	10.2.17.196
6	10.2.17.197/32	10.2.17.197 – 10.2.17.197	10.2.17.197
7	10.2.17.198/32	10.2.17.198 – 10.2.17.198	10.2.17.198
8	10.2.17.199/32	10.2.17.199 – 10.2.17.199	10.2.17.199
9	10.2.17.200/32	10.2.17.200 – 10.2.17.200	10.2.17.200
10	10.2.17.201/32	10.2.17.201 – 10.2.17.201	10.2.17.201
11	10.2.17.202/32	10.2.17.202 – 10.2.17.202	10.2.17.202
12	10.2.17.203/32	10.2.17.203 – 10.2.17.203	10.2.17.203
13	10.2.17.204/32	10.2.17.204 – 10.2.17.204	10.2.17.204
14	10.2.17.205/32	10.2.17.205 – 10.2.17.205	10.2.17.205
15	10.2.17.206/32	10.2.17.206 – 10.2.17.206	10.2.17.206
16	10.2.17.207/32	10.2.17.207 – 10.2.17.207	10.2.17.207
17	10.2.17.208/32	10.2.17.208 – 10.2.17.208	10.2.17.208
18	10.2.17.209/32	10.2.17.209 – 10.2.17.209	10.2.17.209
19	10.2.17.210/32	10.2.17.210 – 10.2.17.210	10.2.17.210
20	10.2.17.211/32	10.2.17.211 – 10.2.17.211	10.2.17.211
21	10.2.17.212/32	10.2.17.212 – 10.2.17.212	10.2.17.212
22	10.2.17.213/32	10.2.17.213 – 10.2.17.213	10.2.17.213
23	10.2.17.214/32	10.2.17.214 – 10.2.17.214	10.2.17.214
24	10.2.17.215/32	10.2.17.215 – 10.2.17.215	10.2.17.215
25	10.2.17.216/32	10.2.17.216 – 10.2.17.216	10.2.17.216
26	10.2.17.217/32	10.2.17.217 – 10.2.17.217	10.2.17.217
27	10.2.17.218/32	10.2.17.218 – 10.2.17.218	10.2.17.218
28	10.2.17.219/32	10.2.17.219 – 10.2.17.219	10.2.17.219
29	10.2.17.220/32	10.2.17.220 – 10.2.17.220	10.2.17.220
30	10.2.17.221/32	10.2.17.221 – 10.2.17.221	10.2.17.221
31	10.2.17.222/32	10.2.17.222 – 10.2.17.222	10.2.17.222
32	10.2.17.223/32	10.2.17.223 – 10.2.17.223	10.2.17.223
33	10.2.17.224/32	10.2.17.224 – 10.2.17.224	10.2.17.224
34	10.2.17.225/32	10.2.17.225 – 10.2.17.225	10.2.17.225
35	10.2.17.226/32	10.2.17.226 – 10.2.17.226	10.2.17.226
36	10.2.17.227/32	10.2.17.227 – 10.2.17.227	10.2.17.227
37	10.2.17.228/32	10.2.17.228 – 10.2.17.228	10.2.17.228
38	10.2.17.229/32	10.2.17.229 – 10.2.17.229	10.2.17.229
39	10.2.17.230/32	10.2.17.230 – 10.2.17.230	10.2.17.230
40	10.2.17.231/32	10.2.17.231 – 10.2.17.231	10.2.17.231
41	10.2.17.232/32	10.2.17.232 – 10.2.17.232	10.2.17.232
42	10.2.17.233/32	10.2.17.233 – 10.2.17.233	10.2.17.233
43	10.2.17.234/32	10.2.17.234 – 10.2.17.234	10.2.17.234
44	10.2.17.235/32	10.2.17.235 – 10.2.17.235	10.2.17.235
45	10.2.17.236/32	10.2.17.236 – 10.2.17.236	10.2.17.236
46	10.2.17.237/32	10.2.17.237 – 10.2.17.237	10.2.17.237
47	10.2.17.238/32	10.2.17.238 – 10.2.17.238	10.2.17.238
48	10.2.17.239/32	10.2.17.239 – 10.2.17.239	10.2.17.239
49	10.2.17.240/32	10.2.17.240 – 10.2.17.240	10.2.17.240
50	10.2.17.241/32	10.2.17.241 – 10.2.17.241	10.2.17.241
51	10.2.17.242/32	10.2.17.242 – 10.2.17.242	10.2.17.242
52	10.2.17.243/32	10.2.17.243 – 10.2.17.243	10.2.17.243
53	10.2.17.244/32	10.2.17.244 – 10.2.17.244	10.2.17.244
54	10.2.17.245/32	10.2.17.245 – 10.2.17.245	10.2.17.245
55	10.2.17.246/32	10.2.17.246 – 10.2.17.246	10.2.17.246
56	10.2.17.247/32	10.2.17.247 – 10.2.17.247	10.2.17.247
57	10.2.17.248/32	10.2.17.248 – 10.2.17.248	10.2.17.248
58	10.2.17.249/32	10.2.17.249 – 10.2.17.249	10.2.17.249
59	10.2.17.250/32	10.2.17.250 – 10.2.17.250	10.2.17.250
60	10.2.17.251/32	10.2.17.251 – 10.2.17.251	10.2.17.251
61	10.2.17.252/32	10.2.17.252 – 10.2.17.252	10.2.17.252
62	10.2.17.253/32	10.2.17.253 – 10.2.17.253	10.2.17.253
63	10.2.17.254/32	10.2.17.254 – 10.2.17.254	10.2.17.254
64	10.2.17.255/32	10.2.17.255 – 10.2.17.255	10.2.17.255

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 →