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)10.131.217.0/24

network10.131.217.0/24

broadcast10.131.217.255

first host10.131.217.1

last host10.131.217.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.217.0/24

address00001010.10000011.11011001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.11011001.00000000

broadcast00001010.10000011.11011001.11111111

green = network part, grey = host part

hex0x0a83d900

decimal176412928

reverse dns0.217.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:d900

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.131.217.0/32	10.131.217.0 – 10.131.217.0	10.131.217.0
2	10.131.217.1/32	10.131.217.1 – 10.131.217.1	10.131.217.1
3	10.131.217.2/32	10.131.217.2 – 10.131.217.2	10.131.217.2
4	10.131.217.3/32	10.131.217.3 – 10.131.217.3	10.131.217.3
5	10.131.217.4/32	10.131.217.4 – 10.131.217.4	10.131.217.4
6	10.131.217.5/32	10.131.217.5 – 10.131.217.5	10.131.217.5
7	10.131.217.6/32	10.131.217.6 – 10.131.217.6	10.131.217.6
8	10.131.217.7/32	10.131.217.7 – 10.131.217.7	10.131.217.7
9	10.131.217.8/32	10.131.217.8 – 10.131.217.8	10.131.217.8
10	10.131.217.9/32	10.131.217.9 – 10.131.217.9	10.131.217.9
11	10.131.217.10/32	10.131.217.10 – 10.131.217.10	10.131.217.10
12	10.131.217.11/32	10.131.217.11 – 10.131.217.11	10.131.217.11
13	10.131.217.12/32	10.131.217.12 – 10.131.217.12	10.131.217.12
14	10.131.217.13/32	10.131.217.13 – 10.131.217.13	10.131.217.13
15	10.131.217.14/32	10.131.217.14 – 10.131.217.14	10.131.217.14
16	10.131.217.15/32	10.131.217.15 – 10.131.217.15	10.131.217.15
17	10.131.217.16/32	10.131.217.16 – 10.131.217.16	10.131.217.16
18	10.131.217.17/32	10.131.217.17 – 10.131.217.17	10.131.217.17
19	10.131.217.18/32	10.131.217.18 – 10.131.217.18	10.131.217.18
20	10.131.217.19/32	10.131.217.19 – 10.131.217.19	10.131.217.19
21	10.131.217.20/32	10.131.217.20 – 10.131.217.20	10.131.217.20
22	10.131.217.21/32	10.131.217.21 – 10.131.217.21	10.131.217.21
23	10.131.217.22/32	10.131.217.22 – 10.131.217.22	10.131.217.22
24	10.131.217.23/32	10.131.217.23 – 10.131.217.23	10.131.217.23
25	10.131.217.24/32	10.131.217.24 – 10.131.217.24	10.131.217.24
26	10.131.217.25/32	10.131.217.25 – 10.131.217.25	10.131.217.25
27	10.131.217.26/32	10.131.217.26 – 10.131.217.26	10.131.217.26
28	10.131.217.27/32	10.131.217.27 – 10.131.217.27	10.131.217.27
29	10.131.217.28/32	10.131.217.28 – 10.131.217.28	10.131.217.28
30	10.131.217.29/32	10.131.217.29 – 10.131.217.29	10.131.217.29
31	10.131.217.30/32	10.131.217.30 – 10.131.217.30	10.131.217.30
32	10.131.217.31/32	10.131.217.31 – 10.131.217.31	10.131.217.31
33	10.131.217.32/32	10.131.217.32 – 10.131.217.32	10.131.217.32
34	10.131.217.33/32	10.131.217.33 – 10.131.217.33	10.131.217.33
35	10.131.217.34/32	10.131.217.34 – 10.131.217.34	10.131.217.34
36	10.131.217.35/32	10.131.217.35 – 10.131.217.35	10.131.217.35
37	10.131.217.36/32	10.131.217.36 – 10.131.217.36	10.131.217.36
38	10.131.217.37/32	10.131.217.37 – 10.131.217.37	10.131.217.37
39	10.131.217.38/32	10.131.217.38 – 10.131.217.38	10.131.217.38
40	10.131.217.39/32	10.131.217.39 – 10.131.217.39	10.131.217.39
41	10.131.217.40/32	10.131.217.40 – 10.131.217.40	10.131.217.40
42	10.131.217.41/32	10.131.217.41 – 10.131.217.41	10.131.217.41
43	10.131.217.42/32	10.131.217.42 – 10.131.217.42	10.131.217.42
44	10.131.217.43/32	10.131.217.43 – 10.131.217.43	10.131.217.43
45	10.131.217.44/32	10.131.217.44 – 10.131.217.44	10.131.217.44
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47	10.131.217.46/32	10.131.217.46 – 10.131.217.46	10.131.217.46
48	10.131.217.47/32	10.131.217.47 – 10.131.217.47	10.131.217.47
49	10.131.217.48/32	10.131.217.48 – 10.131.217.48	10.131.217.48
50	10.131.217.49/32	10.131.217.49 – 10.131.217.49	10.131.217.49
51	10.131.217.50/32	10.131.217.50 – 10.131.217.50	10.131.217.50
52	10.131.217.51/32	10.131.217.51 – 10.131.217.51	10.131.217.51
53	10.131.217.52/32	10.131.217.52 – 10.131.217.52	10.131.217.52
54	10.131.217.53/32	10.131.217.53 – 10.131.217.53	10.131.217.53
55	10.131.217.54/32	10.131.217.54 – 10.131.217.54	10.131.217.54
56	10.131.217.55/32	10.131.217.55 – 10.131.217.55	10.131.217.55
57	10.131.217.56/32	10.131.217.56 – 10.131.217.56	10.131.217.56
58	10.131.217.57/32	10.131.217.57 – 10.131.217.57	10.131.217.57
59	10.131.217.58/32	10.131.217.58 – 10.131.217.58	10.131.217.58
60	10.131.217.59/32	10.131.217.59 – 10.131.217.59	10.131.217.59
61	10.131.217.60/32	10.131.217.60 – 10.131.217.60	10.131.217.60
62	10.131.217.61/32	10.131.217.61 – 10.131.217.61	10.131.217.61
63	10.131.217.62/32	10.131.217.62 – 10.131.217.62	10.131.217.62
64	10.131.217.63/32	10.131.217.63 – 10.131.217.63	10.131.217.63
65	10.131.217.64/32	10.131.217.64 – 10.131.217.64	10.131.217.64
66	10.131.217.65/32	10.131.217.65 – 10.131.217.65	10.131.217.65
67	10.131.217.66/32	10.131.217.66 – 10.131.217.66	10.131.217.66
68	10.131.217.67/32	10.131.217.67 – 10.131.217.67	10.131.217.67
69	10.131.217.68/32	10.131.217.68 – 10.131.217.68	10.131.217.68
70	10.131.217.69/32	10.131.217.69 – 10.131.217.69	10.131.217.69
71	10.131.217.70/32	10.131.217.70 – 10.131.217.70	10.131.217.70
72	10.131.217.71/32	10.131.217.71 – 10.131.217.71	10.131.217.71
73	10.131.217.72/32	10.131.217.72 – 10.131.217.72	10.131.217.72
74	10.131.217.73/32	10.131.217.73 – 10.131.217.73	10.131.217.73
75	10.131.217.74/32	10.131.217.74 – 10.131.217.74	10.131.217.74
76	10.131.217.75/32	10.131.217.75 – 10.131.217.75	10.131.217.75
77	10.131.217.76/32	10.131.217.76 – 10.131.217.76	10.131.217.76
78	10.131.217.77/32	10.131.217.77 – 10.131.217.77	10.131.217.77
79	10.131.217.78/32	10.131.217.78 – 10.131.217.78	10.131.217.78
80	10.131.217.79/32	10.131.217.79 – 10.131.217.79	10.131.217.79
81	10.131.217.80/32	10.131.217.80 – 10.131.217.80	10.131.217.80
82	10.131.217.81/32	10.131.217.81 – 10.131.217.81	10.131.217.81
83	10.131.217.82/32	10.131.217.82 – 10.131.217.82	10.131.217.82
84	10.131.217.83/32	10.131.217.83 – 10.131.217.83	10.131.217.83
85	10.131.217.84/32	10.131.217.84 – 10.131.217.84	10.131.217.84
86	10.131.217.85/32	10.131.217.85 – 10.131.217.85	10.131.217.85
87	10.131.217.86/32	10.131.217.86 – 10.131.217.86	10.131.217.86
88	10.131.217.87/32	10.131.217.87 – 10.131.217.87	10.131.217.87
89	10.131.217.88/32	10.131.217.88 – 10.131.217.88	10.131.217.88
90	10.131.217.89/32	10.131.217.89 – 10.131.217.89	10.131.217.89
91	10.131.217.90/32	10.131.217.90 – 10.131.217.90	10.131.217.90
92	10.131.217.91/32	10.131.217.91 – 10.131.217.91	10.131.217.91
93	10.131.217.92/32	10.131.217.92 – 10.131.217.92	10.131.217.92
94	10.131.217.93/32	10.131.217.93 – 10.131.217.93	10.131.217.93
95	10.131.217.94/32	10.131.217.94 – 10.131.217.94	10.131.217.94
96	10.131.217.95/32	10.131.217.95 – 10.131.217.95	10.131.217.95
97	10.131.217.96/32	10.131.217.96 – 10.131.217.96	10.131.217.96
98	10.131.217.97/32	10.131.217.97 – 10.131.217.97	10.131.217.97
99	10.131.217.98/32	10.131.217.98 – 10.131.217.98	10.131.217.98
100	10.131.217.99/32	10.131.217.99 – 10.131.217.99	10.131.217.99
101	10.131.217.100/32	10.131.217.100 – 10.131.217.100	10.131.217.100
102	10.131.217.101/32	10.131.217.101 – 10.131.217.101	10.131.217.101
103	10.131.217.102/32	10.131.217.102 – 10.131.217.102	10.131.217.102
104	10.131.217.103/32	10.131.217.103 – 10.131.217.103	10.131.217.103
105	10.131.217.104/32	10.131.217.104 – 10.131.217.104	10.131.217.104
106	10.131.217.105/32	10.131.217.105 – 10.131.217.105	10.131.217.105
107	10.131.217.106/32	10.131.217.106 – 10.131.217.106	10.131.217.106
108	10.131.217.107/32	10.131.217.107 – 10.131.217.107	10.131.217.107
109	10.131.217.108/32	10.131.217.108 – 10.131.217.108	10.131.217.108
110	10.131.217.109/32	10.131.217.109 – 10.131.217.109	10.131.217.109
111	10.131.217.110/32	10.131.217.110 – 10.131.217.110	10.131.217.110
112	10.131.217.111/32	10.131.217.111 – 10.131.217.111	10.131.217.111
113	10.131.217.112/32	10.131.217.112 – 10.131.217.112	10.131.217.112
114	10.131.217.113/32	10.131.217.113 – 10.131.217.113	10.131.217.113
115	10.131.217.114/32	10.131.217.114 – 10.131.217.114	10.131.217.114
116	10.131.217.115/32	10.131.217.115 – 10.131.217.115	10.131.217.115
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128	10.131.217.127/32	10.131.217.127 – 10.131.217.127	10.131.217.127
129	10.131.217.128/32	10.131.217.128 – 10.131.217.128	10.131.217.128
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141	10.131.217.140/32	10.131.217.140 – 10.131.217.140	10.131.217.140
142	10.131.217.141/32	10.131.217.141 – 10.131.217.141	10.131.217.141
143	10.131.217.142/32	10.131.217.142 – 10.131.217.142	10.131.217.142
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210	10.131.217.209/32	10.131.217.209 – 10.131.217.209	10.131.217.209
211	10.131.217.210/32	10.131.217.210 – 10.131.217.210	10.131.217.210
212	10.131.217.211/32	10.131.217.211 – 10.131.217.211	10.131.217.211
213	10.131.217.212/32	10.131.217.212 – 10.131.217.212	10.131.217.212
214	10.131.217.213/32	10.131.217.213 – 10.131.217.213	10.131.217.213
215	10.131.217.214/32	10.131.217.214 – 10.131.217.214	10.131.217.214
216	10.131.217.215/32	10.131.217.215 – 10.131.217.215	10.131.217.215
217	10.131.217.216/32	10.131.217.216 – 10.131.217.216	10.131.217.216
218	10.131.217.217/32	10.131.217.217 – 10.131.217.217	10.131.217.217
219	10.131.217.218/32	10.131.217.218 – 10.131.217.218	10.131.217.218
220	10.131.217.219/32	10.131.217.219 – 10.131.217.219	10.131.217.219
221	10.131.217.220/32	10.131.217.220 – 10.131.217.220	10.131.217.220
222	10.131.217.221/32	10.131.217.221 – 10.131.217.221	10.131.217.221
223	10.131.217.222/32	10.131.217.222 – 10.131.217.222	10.131.217.222
224	10.131.217.223/32	10.131.217.223 – 10.131.217.223	10.131.217.223
225	10.131.217.224/32	10.131.217.224 – 10.131.217.224	10.131.217.224
226	10.131.217.225/32	10.131.217.225 – 10.131.217.225	10.131.217.225
227	10.131.217.226/32	10.131.217.226 – 10.131.217.226	10.131.217.226
228	10.131.217.227/32	10.131.217.227 – 10.131.217.227	10.131.217.227
229	10.131.217.228/32	10.131.217.228 – 10.131.217.228	10.131.217.228
230	10.131.217.229/32	10.131.217.229 – 10.131.217.229	10.131.217.229
231	10.131.217.230/32	10.131.217.230 – 10.131.217.230	10.131.217.230
232	10.131.217.231/32	10.131.217.231 – 10.131.217.231	10.131.217.231
233	10.131.217.232/32	10.131.217.232 – 10.131.217.232	10.131.217.232
234	10.131.217.233/32	10.131.217.233 – 10.131.217.233	10.131.217.233
235	10.131.217.234/32	10.131.217.234 – 10.131.217.234	10.131.217.234
236	10.131.217.235/32	10.131.217.235 – 10.131.217.235	10.131.217.235
237	10.131.217.236/32	10.131.217.236 – 10.131.217.236	10.131.217.236
238	10.131.217.237/32	10.131.217.237 – 10.131.217.237	10.131.217.237
239	10.131.217.238/32	10.131.217.238 – 10.131.217.238	10.131.217.238
240	10.131.217.239/32	10.131.217.239 – 10.131.217.239	10.131.217.239
241	10.131.217.240/32	10.131.217.240 – 10.131.217.240	10.131.217.240
242	10.131.217.241/32	10.131.217.241 – 10.131.217.241	10.131.217.241
243	10.131.217.242/32	10.131.217.242 – 10.131.217.242	10.131.217.242
244	10.131.217.243/32	10.131.217.243 – 10.131.217.243	10.131.217.243
245	10.131.217.244/32	10.131.217.244 – 10.131.217.244	10.131.217.244
246	10.131.217.245/32	10.131.217.245 – 10.131.217.245	10.131.217.245
247	10.131.217.246/32	10.131.217.246 – 10.131.217.246	10.131.217.246
248	10.131.217.247/32	10.131.217.247 – 10.131.217.247	10.131.217.247
249	10.131.217.248/32	10.131.217.248 – 10.131.217.248	10.131.217.248
250	10.131.217.249/32	10.131.217.249 – 10.131.217.249	10.131.217.249
251	10.131.217.250/32	10.131.217.250 – 10.131.217.250	10.131.217.250
252	10.131.217.251/32	10.131.217.251 – 10.131.217.251	10.131.217.251
253	10.131.217.252/32	10.131.217.252 – 10.131.217.252	10.131.217.252
254	10.131.217.253/32	10.131.217.253 – 10.131.217.253	10.131.217.253
255	10.131.217.254/32	10.131.217.254 – 10.131.217.254	10.131.217.254
256	10.131.217.255/32	10.131.217.255 – 10.131.217.255	10.131.217.255

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 →