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)10.3.99.192/26

network10.3.99.192/26

broadcast10.3.99.255

first host10.3.99.193

last host10.3.99.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.3.99.192/26

address00001010.00000011.01100011.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000011.01100011.11000000

broadcast00001010.00000011.01100011.11111111

green = network part, grey = host part

hex0x0a0363c0

decimal167994304

reverse dns192.99.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:63c0

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.99.192/32	10.3.99.192 – 10.3.99.192	10.3.99.192
2	10.3.99.193/32	10.3.99.193 – 10.3.99.193	10.3.99.193
3	10.3.99.194/32	10.3.99.194 – 10.3.99.194	10.3.99.194
4	10.3.99.195/32	10.3.99.195 – 10.3.99.195	10.3.99.195
5	10.3.99.196/32	10.3.99.196 – 10.3.99.196	10.3.99.196
6	10.3.99.197/32	10.3.99.197 – 10.3.99.197	10.3.99.197
7	10.3.99.198/32	10.3.99.198 – 10.3.99.198	10.3.99.198
8	10.3.99.199/32	10.3.99.199 – 10.3.99.199	10.3.99.199
9	10.3.99.200/32	10.3.99.200 – 10.3.99.200	10.3.99.200
10	10.3.99.201/32	10.3.99.201 – 10.3.99.201	10.3.99.201
11	10.3.99.202/32	10.3.99.202 – 10.3.99.202	10.3.99.202
12	10.3.99.203/32	10.3.99.203 – 10.3.99.203	10.3.99.203
13	10.3.99.204/32	10.3.99.204 – 10.3.99.204	10.3.99.204
14	10.3.99.205/32	10.3.99.205 – 10.3.99.205	10.3.99.205
15	10.3.99.206/32	10.3.99.206 – 10.3.99.206	10.3.99.206
16	10.3.99.207/32	10.3.99.207 – 10.3.99.207	10.3.99.207
17	10.3.99.208/32	10.3.99.208 – 10.3.99.208	10.3.99.208
18	10.3.99.209/32	10.3.99.209 – 10.3.99.209	10.3.99.209
19	10.3.99.210/32	10.3.99.210 – 10.3.99.210	10.3.99.210
20	10.3.99.211/32	10.3.99.211 – 10.3.99.211	10.3.99.211
21	10.3.99.212/32	10.3.99.212 – 10.3.99.212	10.3.99.212
22	10.3.99.213/32	10.3.99.213 – 10.3.99.213	10.3.99.213
23	10.3.99.214/32	10.3.99.214 – 10.3.99.214	10.3.99.214
24	10.3.99.215/32	10.3.99.215 – 10.3.99.215	10.3.99.215
25	10.3.99.216/32	10.3.99.216 – 10.3.99.216	10.3.99.216
26	10.3.99.217/32	10.3.99.217 – 10.3.99.217	10.3.99.217
27	10.3.99.218/32	10.3.99.218 – 10.3.99.218	10.3.99.218
28	10.3.99.219/32	10.3.99.219 – 10.3.99.219	10.3.99.219
29	10.3.99.220/32	10.3.99.220 – 10.3.99.220	10.3.99.220
30	10.3.99.221/32	10.3.99.221 – 10.3.99.221	10.3.99.221
31	10.3.99.222/32	10.3.99.222 – 10.3.99.222	10.3.99.222
32	10.3.99.223/32	10.3.99.223 – 10.3.99.223	10.3.99.223
33	10.3.99.224/32	10.3.99.224 – 10.3.99.224	10.3.99.224
34	10.3.99.225/32	10.3.99.225 – 10.3.99.225	10.3.99.225
35	10.3.99.226/32	10.3.99.226 – 10.3.99.226	10.3.99.226
36	10.3.99.227/32	10.3.99.227 – 10.3.99.227	10.3.99.227
37	10.3.99.228/32	10.3.99.228 – 10.3.99.228	10.3.99.228
38	10.3.99.229/32	10.3.99.229 – 10.3.99.229	10.3.99.229
39	10.3.99.230/32	10.3.99.230 – 10.3.99.230	10.3.99.230
40	10.3.99.231/32	10.3.99.231 – 10.3.99.231	10.3.99.231
41	10.3.99.232/32	10.3.99.232 – 10.3.99.232	10.3.99.232
42	10.3.99.233/32	10.3.99.233 – 10.3.99.233	10.3.99.233
43	10.3.99.234/32	10.3.99.234 – 10.3.99.234	10.3.99.234
44	10.3.99.235/32	10.3.99.235 – 10.3.99.235	10.3.99.235
45	10.3.99.236/32	10.3.99.236 – 10.3.99.236	10.3.99.236
46	10.3.99.237/32	10.3.99.237 – 10.3.99.237	10.3.99.237
47	10.3.99.238/32	10.3.99.238 – 10.3.99.238	10.3.99.238
48	10.3.99.239/32	10.3.99.239 – 10.3.99.239	10.3.99.239
49	10.3.99.240/32	10.3.99.240 – 10.3.99.240	10.3.99.240
50	10.3.99.241/32	10.3.99.241 – 10.3.99.241	10.3.99.241
51	10.3.99.242/32	10.3.99.242 – 10.3.99.242	10.3.99.242
52	10.3.99.243/32	10.3.99.243 – 10.3.99.243	10.3.99.243
53	10.3.99.244/32	10.3.99.244 – 10.3.99.244	10.3.99.244
54	10.3.99.245/32	10.3.99.245 – 10.3.99.245	10.3.99.245
55	10.3.99.246/32	10.3.99.246 – 10.3.99.246	10.3.99.246
56	10.3.99.247/32	10.3.99.247 – 10.3.99.247	10.3.99.247
57	10.3.99.248/32	10.3.99.248 – 10.3.99.248	10.3.99.248
58	10.3.99.249/32	10.3.99.249 – 10.3.99.249	10.3.99.249
59	10.3.99.250/32	10.3.99.250 – 10.3.99.250	10.3.99.250
60	10.3.99.251/32	10.3.99.251 – 10.3.99.251	10.3.99.251
61	10.3.99.252/32	10.3.99.252 – 10.3.99.252	10.3.99.252
62	10.3.99.253/32	10.3.99.253 – 10.3.99.253	10.3.99.253
63	10.3.99.254/32	10.3.99.254 – 10.3.99.254	10.3.99.254
64	10.3.99.255/32	10.3.99.255 – 10.3.99.255	10.3.99.255

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 →