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)10.166.131.0/24

network10.166.131.0/24

broadcast10.166.131.255

first host10.166.131.1

last host10.166.131.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.131.0/24

address00001010.10100110.10000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.10000011.00000000

broadcast00001010.10100110.10000011.11111111

green = network part, grey = host part

hex0x0aa68300

decimal178684672

reverse dns0.131.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:8300

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.166.131.0/32	10.166.131.0 – 10.166.131.0	10.166.131.0
2	10.166.131.1/32	10.166.131.1 – 10.166.131.1	10.166.131.1
3	10.166.131.2/32	10.166.131.2 – 10.166.131.2	10.166.131.2
4	10.166.131.3/32	10.166.131.3 – 10.166.131.3	10.166.131.3
5	10.166.131.4/32	10.166.131.4 – 10.166.131.4	10.166.131.4
6	10.166.131.5/32	10.166.131.5 – 10.166.131.5	10.166.131.5
7	10.166.131.6/32	10.166.131.6 – 10.166.131.6	10.166.131.6
8	10.166.131.7/32	10.166.131.7 – 10.166.131.7	10.166.131.7
9	10.166.131.8/32	10.166.131.8 – 10.166.131.8	10.166.131.8
10	10.166.131.9/32	10.166.131.9 – 10.166.131.9	10.166.131.9
11	10.166.131.10/32	10.166.131.10 – 10.166.131.10	10.166.131.10
12	10.166.131.11/32	10.166.131.11 – 10.166.131.11	10.166.131.11
13	10.166.131.12/32	10.166.131.12 – 10.166.131.12	10.166.131.12
14	10.166.131.13/32	10.166.131.13 – 10.166.131.13	10.166.131.13
15	10.166.131.14/32	10.166.131.14 – 10.166.131.14	10.166.131.14
16	10.166.131.15/32	10.166.131.15 – 10.166.131.15	10.166.131.15
17	10.166.131.16/32	10.166.131.16 – 10.166.131.16	10.166.131.16
18	10.166.131.17/32	10.166.131.17 – 10.166.131.17	10.166.131.17
19	10.166.131.18/32	10.166.131.18 – 10.166.131.18	10.166.131.18
20	10.166.131.19/32	10.166.131.19 – 10.166.131.19	10.166.131.19
21	10.166.131.20/32	10.166.131.20 – 10.166.131.20	10.166.131.20
22	10.166.131.21/32	10.166.131.21 – 10.166.131.21	10.166.131.21
23	10.166.131.22/32	10.166.131.22 – 10.166.131.22	10.166.131.22
24	10.166.131.23/32	10.166.131.23 – 10.166.131.23	10.166.131.23
25	10.166.131.24/32	10.166.131.24 – 10.166.131.24	10.166.131.24
26	10.166.131.25/32	10.166.131.25 – 10.166.131.25	10.166.131.25
27	10.166.131.26/32	10.166.131.26 – 10.166.131.26	10.166.131.26
28	10.166.131.27/32	10.166.131.27 – 10.166.131.27	10.166.131.27
29	10.166.131.28/32	10.166.131.28 – 10.166.131.28	10.166.131.28
30	10.166.131.29/32	10.166.131.29 – 10.166.131.29	10.166.131.29
31	10.166.131.30/32	10.166.131.30 – 10.166.131.30	10.166.131.30
32	10.166.131.31/32	10.166.131.31 – 10.166.131.31	10.166.131.31
33	10.166.131.32/32	10.166.131.32 – 10.166.131.32	10.166.131.32
34	10.166.131.33/32	10.166.131.33 – 10.166.131.33	10.166.131.33
35	10.166.131.34/32	10.166.131.34 – 10.166.131.34	10.166.131.34
36	10.166.131.35/32	10.166.131.35 – 10.166.131.35	10.166.131.35
37	10.166.131.36/32	10.166.131.36 – 10.166.131.36	10.166.131.36
38	10.166.131.37/32	10.166.131.37 – 10.166.131.37	10.166.131.37
39	10.166.131.38/32	10.166.131.38 – 10.166.131.38	10.166.131.38
40	10.166.131.39/32	10.166.131.39 – 10.166.131.39	10.166.131.39
41	10.166.131.40/32	10.166.131.40 – 10.166.131.40	10.166.131.40
42	10.166.131.41/32	10.166.131.41 – 10.166.131.41	10.166.131.41
43	10.166.131.42/32	10.166.131.42 – 10.166.131.42	10.166.131.42
44	10.166.131.43/32	10.166.131.43 – 10.166.131.43	10.166.131.43
45	10.166.131.44/32	10.166.131.44 – 10.166.131.44	10.166.131.44
46	10.166.131.45/32	10.166.131.45 – 10.166.131.45	10.166.131.45
47	10.166.131.46/32	10.166.131.46 – 10.166.131.46	10.166.131.46
48	10.166.131.47/32	10.166.131.47 – 10.166.131.47	10.166.131.47
49	10.166.131.48/32	10.166.131.48 – 10.166.131.48	10.166.131.48
50	10.166.131.49/32	10.166.131.49 – 10.166.131.49	10.166.131.49
51	10.166.131.50/32	10.166.131.50 – 10.166.131.50	10.166.131.50
52	10.166.131.51/32	10.166.131.51 – 10.166.131.51	10.166.131.51
53	10.166.131.52/32	10.166.131.52 – 10.166.131.52	10.166.131.52
54	10.166.131.53/32	10.166.131.53 – 10.166.131.53	10.166.131.53
55	10.166.131.54/32	10.166.131.54 – 10.166.131.54	10.166.131.54
56	10.166.131.55/32	10.166.131.55 – 10.166.131.55	10.166.131.55
57	10.166.131.56/32	10.166.131.56 – 10.166.131.56	10.166.131.56
58	10.166.131.57/32	10.166.131.57 – 10.166.131.57	10.166.131.57
59	10.166.131.58/32	10.166.131.58 – 10.166.131.58	10.166.131.58
60	10.166.131.59/32	10.166.131.59 – 10.166.131.59	10.166.131.59
61	10.166.131.60/32	10.166.131.60 – 10.166.131.60	10.166.131.60
62	10.166.131.61/32	10.166.131.61 – 10.166.131.61	10.166.131.61
63	10.166.131.62/32	10.166.131.62 – 10.166.131.62	10.166.131.62
64	10.166.131.63/32	10.166.131.63 – 10.166.131.63	10.166.131.63
65	10.166.131.64/32	10.166.131.64 – 10.166.131.64	10.166.131.64
66	10.166.131.65/32	10.166.131.65 – 10.166.131.65	10.166.131.65
67	10.166.131.66/32	10.166.131.66 – 10.166.131.66	10.166.131.66
68	10.166.131.67/32	10.166.131.67 – 10.166.131.67	10.166.131.67
69	10.166.131.68/32	10.166.131.68 – 10.166.131.68	10.166.131.68
70	10.166.131.69/32	10.166.131.69 – 10.166.131.69	10.166.131.69
71	10.166.131.70/32	10.166.131.70 – 10.166.131.70	10.166.131.70
72	10.166.131.71/32	10.166.131.71 – 10.166.131.71	10.166.131.71
73	10.166.131.72/32	10.166.131.72 – 10.166.131.72	10.166.131.72
74	10.166.131.73/32	10.166.131.73 – 10.166.131.73	10.166.131.73
75	10.166.131.74/32	10.166.131.74 – 10.166.131.74	10.166.131.74
76	10.166.131.75/32	10.166.131.75 – 10.166.131.75	10.166.131.75
77	10.166.131.76/32	10.166.131.76 – 10.166.131.76	10.166.131.76
78	10.166.131.77/32	10.166.131.77 – 10.166.131.77	10.166.131.77
79	10.166.131.78/32	10.166.131.78 – 10.166.131.78	10.166.131.78
80	10.166.131.79/32	10.166.131.79 – 10.166.131.79	10.166.131.79
81	10.166.131.80/32	10.166.131.80 – 10.166.131.80	10.166.131.80
82	10.166.131.81/32	10.166.131.81 – 10.166.131.81	10.166.131.81
83	10.166.131.82/32	10.166.131.82 – 10.166.131.82	10.166.131.82
84	10.166.131.83/32	10.166.131.83 – 10.166.131.83	10.166.131.83
85	10.166.131.84/32	10.166.131.84 – 10.166.131.84	10.166.131.84
86	10.166.131.85/32	10.166.131.85 – 10.166.131.85	10.166.131.85
87	10.166.131.86/32	10.166.131.86 – 10.166.131.86	10.166.131.86
88	10.166.131.87/32	10.166.131.87 – 10.166.131.87	10.166.131.87
89	10.166.131.88/32	10.166.131.88 – 10.166.131.88	10.166.131.88
90	10.166.131.89/32	10.166.131.89 – 10.166.131.89	10.166.131.89
91	10.166.131.90/32	10.166.131.90 – 10.166.131.90	10.166.131.90
92	10.166.131.91/32	10.166.131.91 – 10.166.131.91	10.166.131.91
93	10.166.131.92/32	10.166.131.92 – 10.166.131.92	10.166.131.92
94	10.166.131.93/32	10.166.131.93 – 10.166.131.93	10.166.131.93
95	10.166.131.94/32	10.166.131.94 – 10.166.131.94	10.166.131.94
96	10.166.131.95/32	10.166.131.95 – 10.166.131.95	10.166.131.95
97	10.166.131.96/32	10.166.131.96 – 10.166.131.96	10.166.131.96
98	10.166.131.97/32	10.166.131.97 – 10.166.131.97	10.166.131.97
99	10.166.131.98/32	10.166.131.98 – 10.166.131.98	10.166.131.98
100	10.166.131.99/32	10.166.131.99 – 10.166.131.99	10.166.131.99
101	10.166.131.100/32	10.166.131.100 – 10.166.131.100	10.166.131.100
102	10.166.131.101/32	10.166.131.101 – 10.166.131.101	10.166.131.101
103	10.166.131.102/32	10.166.131.102 – 10.166.131.102	10.166.131.102
104	10.166.131.103/32	10.166.131.103 – 10.166.131.103	10.166.131.103
105	10.166.131.104/32	10.166.131.104 – 10.166.131.104	10.166.131.104
106	10.166.131.105/32	10.166.131.105 – 10.166.131.105	10.166.131.105
107	10.166.131.106/32	10.166.131.106 – 10.166.131.106	10.166.131.106
108	10.166.131.107/32	10.166.131.107 – 10.166.131.107	10.166.131.107
109	10.166.131.108/32	10.166.131.108 – 10.166.131.108	10.166.131.108
110	10.166.131.109/32	10.166.131.109 – 10.166.131.109	10.166.131.109
111	10.166.131.110/32	10.166.131.110 – 10.166.131.110	10.166.131.110
112	10.166.131.111/32	10.166.131.111 – 10.166.131.111	10.166.131.111
113	10.166.131.112/32	10.166.131.112 – 10.166.131.112	10.166.131.112
114	10.166.131.113/32	10.166.131.113 – 10.166.131.113	10.166.131.113
115	10.166.131.114/32	10.166.131.114 – 10.166.131.114	10.166.131.114
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128	10.166.131.127/32	10.166.131.127 – 10.166.131.127	10.166.131.127
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142	10.166.131.141/32	10.166.131.141 – 10.166.131.141	10.166.131.141
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210	10.166.131.209/32	10.166.131.209 – 10.166.131.209	10.166.131.209
211	10.166.131.210/32	10.166.131.210 – 10.166.131.210	10.166.131.210
212	10.166.131.211/32	10.166.131.211 – 10.166.131.211	10.166.131.211
213	10.166.131.212/32	10.166.131.212 – 10.166.131.212	10.166.131.212
214	10.166.131.213/32	10.166.131.213 – 10.166.131.213	10.166.131.213
215	10.166.131.214/32	10.166.131.214 – 10.166.131.214	10.166.131.214
216	10.166.131.215/32	10.166.131.215 – 10.166.131.215	10.166.131.215
217	10.166.131.216/32	10.166.131.216 – 10.166.131.216	10.166.131.216
218	10.166.131.217/32	10.166.131.217 – 10.166.131.217	10.166.131.217
219	10.166.131.218/32	10.166.131.218 – 10.166.131.218	10.166.131.218
220	10.166.131.219/32	10.166.131.219 – 10.166.131.219	10.166.131.219
221	10.166.131.220/32	10.166.131.220 – 10.166.131.220	10.166.131.220
222	10.166.131.221/32	10.166.131.221 – 10.166.131.221	10.166.131.221
223	10.166.131.222/32	10.166.131.222 – 10.166.131.222	10.166.131.222
224	10.166.131.223/32	10.166.131.223 – 10.166.131.223	10.166.131.223
225	10.166.131.224/32	10.166.131.224 – 10.166.131.224	10.166.131.224
226	10.166.131.225/32	10.166.131.225 – 10.166.131.225	10.166.131.225
227	10.166.131.226/32	10.166.131.226 – 10.166.131.226	10.166.131.226
228	10.166.131.227/32	10.166.131.227 – 10.166.131.227	10.166.131.227
229	10.166.131.228/32	10.166.131.228 – 10.166.131.228	10.166.131.228
230	10.166.131.229/32	10.166.131.229 – 10.166.131.229	10.166.131.229
231	10.166.131.230/32	10.166.131.230 – 10.166.131.230	10.166.131.230
232	10.166.131.231/32	10.166.131.231 – 10.166.131.231	10.166.131.231
233	10.166.131.232/32	10.166.131.232 – 10.166.131.232	10.166.131.232
234	10.166.131.233/32	10.166.131.233 – 10.166.131.233	10.166.131.233
235	10.166.131.234/32	10.166.131.234 – 10.166.131.234	10.166.131.234
236	10.166.131.235/32	10.166.131.235 – 10.166.131.235	10.166.131.235
237	10.166.131.236/32	10.166.131.236 – 10.166.131.236	10.166.131.236
238	10.166.131.237/32	10.166.131.237 – 10.166.131.237	10.166.131.237
239	10.166.131.238/32	10.166.131.238 – 10.166.131.238	10.166.131.238
240	10.166.131.239/32	10.166.131.239 – 10.166.131.239	10.166.131.239
241	10.166.131.240/32	10.166.131.240 – 10.166.131.240	10.166.131.240
242	10.166.131.241/32	10.166.131.241 – 10.166.131.241	10.166.131.241
243	10.166.131.242/32	10.166.131.242 – 10.166.131.242	10.166.131.242
244	10.166.131.243/32	10.166.131.243 – 10.166.131.243	10.166.131.243
245	10.166.131.244/32	10.166.131.244 – 10.166.131.244	10.166.131.244
246	10.166.131.245/32	10.166.131.245 – 10.166.131.245	10.166.131.245
247	10.166.131.246/32	10.166.131.246 – 10.166.131.246	10.166.131.246
248	10.166.131.247/32	10.166.131.247 – 10.166.131.247	10.166.131.247
249	10.166.131.248/32	10.166.131.248 – 10.166.131.248	10.166.131.248
250	10.166.131.249/32	10.166.131.249 – 10.166.131.249	10.166.131.249
251	10.166.131.250/32	10.166.131.250 – 10.166.131.250	10.166.131.250
252	10.166.131.251/32	10.166.131.251 – 10.166.131.251	10.166.131.251
253	10.166.131.252/32	10.166.131.252 – 10.166.131.252	10.166.131.252
254	10.166.131.253/32	10.166.131.253 – 10.166.131.253	10.166.131.253
255	10.166.131.254/32	10.166.131.254 – 10.166.131.254	10.166.131.254
256	10.166.131.255/32	10.166.131.255 – 10.166.131.255	10.166.131.255

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 /24
/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	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →