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)10.3.184.0/21

network10.3.184.0/21

broadcast10.3.191.255

first host10.3.184.1

last host10.3.191.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.184.0/21

address00001010.00000011.10111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.10111000.00000000

broadcast00001010.00000011.10111111.11111111

green = network part, grey = host part

hex0x0a03b800

decimal168015872

reverse dns0.184.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:b800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.3.184.0/32	10.3.184.0 – 10.3.184.0	10.3.184.0
2	10.3.184.1/32	10.3.184.1 – 10.3.184.1	10.3.184.1
3	10.3.184.2/32	10.3.184.2 – 10.3.184.2	10.3.184.2
4	10.3.184.3/32	10.3.184.3 – 10.3.184.3	10.3.184.3
5	10.3.184.4/32	10.3.184.4 – 10.3.184.4	10.3.184.4
6	10.3.184.5/32	10.3.184.5 – 10.3.184.5	10.3.184.5
7	10.3.184.6/32	10.3.184.6 – 10.3.184.6	10.3.184.6
8	10.3.184.7/32	10.3.184.7 – 10.3.184.7	10.3.184.7
9	10.3.184.8/32	10.3.184.8 – 10.3.184.8	10.3.184.8
10	10.3.184.9/32	10.3.184.9 – 10.3.184.9	10.3.184.9
11	10.3.184.10/32	10.3.184.10 – 10.3.184.10	10.3.184.10
12	10.3.184.11/32	10.3.184.11 – 10.3.184.11	10.3.184.11
13	10.3.184.12/32	10.3.184.12 – 10.3.184.12	10.3.184.12
14	10.3.184.13/32	10.3.184.13 – 10.3.184.13	10.3.184.13
15	10.3.184.14/32	10.3.184.14 – 10.3.184.14	10.3.184.14
16	10.3.184.15/32	10.3.184.15 – 10.3.184.15	10.3.184.15
17	10.3.184.16/32	10.3.184.16 – 10.3.184.16	10.3.184.16
18	10.3.184.17/32	10.3.184.17 – 10.3.184.17	10.3.184.17
19	10.3.184.18/32	10.3.184.18 – 10.3.184.18	10.3.184.18
20	10.3.184.19/32	10.3.184.19 – 10.3.184.19	10.3.184.19
21	10.3.184.20/32	10.3.184.20 – 10.3.184.20	10.3.184.20
22	10.3.184.21/32	10.3.184.21 – 10.3.184.21	10.3.184.21
23	10.3.184.22/32	10.3.184.22 – 10.3.184.22	10.3.184.22
24	10.3.184.23/32	10.3.184.23 – 10.3.184.23	10.3.184.23
25	10.3.184.24/32	10.3.184.24 – 10.3.184.24	10.3.184.24
26	10.3.184.25/32	10.3.184.25 – 10.3.184.25	10.3.184.25
27	10.3.184.26/32	10.3.184.26 – 10.3.184.26	10.3.184.26
28	10.3.184.27/32	10.3.184.27 – 10.3.184.27	10.3.184.27
29	10.3.184.28/32	10.3.184.28 – 10.3.184.28	10.3.184.28
30	10.3.184.29/32	10.3.184.29 – 10.3.184.29	10.3.184.29
31	10.3.184.30/32	10.3.184.30 – 10.3.184.30	10.3.184.30
32	10.3.184.31/32	10.3.184.31 – 10.3.184.31	10.3.184.31
33	10.3.184.32/32	10.3.184.32 – 10.3.184.32	10.3.184.32
34	10.3.184.33/32	10.3.184.33 – 10.3.184.33	10.3.184.33
35	10.3.184.34/32	10.3.184.34 – 10.3.184.34	10.3.184.34
36	10.3.184.35/32	10.3.184.35 – 10.3.184.35	10.3.184.35
37	10.3.184.36/32	10.3.184.36 – 10.3.184.36	10.3.184.36
38	10.3.184.37/32	10.3.184.37 – 10.3.184.37	10.3.184.37
39	10.3.184.38/32	10.3.184.38 – 10.3.184.38	10.3.184.38
40	10.3.184.39/32	10.3.184.39 – 10.3.184.39	10.3.184.39
41	10.3.184.40/32	10.3.184.40 – 10.3.184.40	10.3.184.40
42	10.3.184.41/32	10.3.184.41 – 10.3.184.41	10.3.184.41
43	10.3.184.42/32	10.3.184.42 – 10.3.184.42	10.3.184.42
44	10.3.184.43/32	10.3.184.43 – 10.3.184.43	10.3.184.43
45	10.3.184.44/32	10.3.184.44 – 10.3.184.44	10.3.184.44
46	10.3.184.45/32	10.3.184.45 – 10.3.184.45	10.3.184.45
47	10.3.184.46/32	10.3.184.46 – 10.3.184.46	10.3.184.46
48	10.3.184.47/32	10.3.184.47 – 10.3.184.47	10.3.184.47
49	10.3.184.48/32	10.3.184.48 – 10.3.184.48	10.3.184.48
50	10.3.184.49/32	10.3.184.49 – 10.3.184.49	10.3.184.49
51	10.3.184.50/32	10.3.184.50 – 10.3.184.50	10.3.184.50
52	10.3.184.51/32	10.3.184.51 – 10.3.184.51	10.3.184.51
53	10.3.184.52/32	10.3.184.52 – 10.3.184.52	10.3.184.52
54	10.3.184.53/32	10.3.184.53 – 10.3.184.53	10.3.184.53
55	10.3.184.54/32	10.3.184.54 – 10.3.184.54	10.3.184.54
56	10.3.184.55/32	10.3.184.55 – 10.3.184.55	10.3.184.55
57	10.3.184.56/32	10.3.184.56 – 10.3.184.56	10.3.184.56
58	10.3.184.57/32	10.3.184.57 – 10.3.184.57	10.3.184.57
59	10.3.184.58/32	10.3.184.58 – 10.3.184.58	10.3.184.58
60	10.3.184.59/32	10.3.184.59 – 10.3.184.59	10.3.184.59
61	10.3.184.60/32	10.3.184.60 – 10.3.184.60	10.3.184.60
62	10.3.184.61/32	10.3.184.61 – 10.3.184.61	10.3.184.61
63	10.3.184.62/32	10.3.184.62 – 10.3.184.62	10.3.184.62
64	10.3.184.63/32	10.3.184.63 – 10.3.184.63	10.3.184.63
65	10.3.184.64/32	10.3.184.64 – 10.3.184.64	10.3.184.64
66	10.3.184.65/32	10.3.184.65 – 10.3.184.65	10.3.184.65
67	10.3.184.66/32	10.3.184.66 – 10.3.184.66	10.3.184.66
68	10.3.184.67/32	10.3.184.67 – 10.3.184.67	10.3.184.67
69	10.3.184.68/32	10.3.184.68 – 10.3.184.68	10.3.184.68
70	10.3.184.69/32	10.3.184.69 – 10.3.184.69	10.3.184.69
71	10.3.184.70/32	10.3.184.70 – 10.3.184.70	10.3.184.70
72	10.3.184.71/32	10.3.184.71 – 10.3.184.71	10.3.184.71
73	10.3.184.72/32	10.3.184.72 – 10.3.184.72	10.3.184.72
74	10.3.184.73/32	10.3.184.73 – 10.3.184.73	10.3.184.73
75	10.3.184.74/32	10.3.184.74 – 10.3.184.74	10.3.184.74
76	10.3.184.75/32	10.3.184.75 – 10.3.184.75	10.3.184.75
77	10.3.184.76/32	10.3.184.76 – 10.3.184.76	10.3.184.76
78	10.3.184.77/32	10.3.184.77 – 10.3.184.77	10.3.184.77
79	10.3.184.78/32	10.3.184.78 – 10.3.184.78	10.3.184.78
80	10.3.184.79/32	10.3.184.79 – 10.3.184.79	10.3.184.79
81	10.3.184.80/32	10.3.184.80 – 10.3.184.80	10.3.184.80
82	10.3.184.81/32	10.3.184.81 – 10.3.184.81	10.3.184.81
83	10.3.184.82/32	10.3.184.82 – 10.3.184.82	10.3.184.82
84	10.3.184.83/32	10.3.184.83 – 10.3.184.83	10.3.184.83
85	10.3.184.84/32	10.3.184.84 – 10.3.184.84	10.3.184.84
86	10.3.184.85/32	10.3.184.85 – 10.3.184.85	10.3.184.85
87	10.3.184.86/32	10.3.184.86 – 10.3.184.86	10.3.184.86
88	10.3.184.87/32	10.3.184.87 – 10.3.184.87	10.3.184.87
89	10.3.184.88/32	10.3.184.88 – 10.3.184.88	10.3.184.88
90	10.3.184.89/32	10.3.184.89 – 10.3.184.89	10.3.184.89
91	10.3.184.90/32	10.3.184.90 – 10.3.184.90	10.3.184.90
92	10.3.184.91/32	10.3.184.91 – 10.3.184.91	10.3.184.91
93	10.3.184.92/32	10.3.184.92 – 10.3.184.92	10.3.184.92
94	10.3.184.93/32	10.3.184.93 – 10.3.184.93	10.3.184.93
95	10.3.184.94/32	10.3.184.94 – 10.3.184.94	10.3.184.94
96	10.3.184.95/32	10.3.184.95 – 10.3.184.95	10.3.184.95
97	10.3.184.96/32	10.3.184.96 – 10.3.184.96	10.3.184.96
98	10.3.184.97/32	10.3.184.97 – 10.3.184.97	10.3.184.97
99	10.3.184.98/32	10.3.184.98 – 10.3.184.98	10.3.184.98
100	10.3.184.99/32	10.3.184.99 – 10.3.184.99	10.3.184.99
101	10.3.184.100/32	10.3.184.100 – 10.3.184.100	10.3.184.100
102	10.3.184.101/32	10.3.184.101 – 10.3.184.101	10.3.184.101
103	10.3.184.102/32	10.3.184.102 – 10.3.184.102	10.3.184.102
104	10.3.184.103/32	10.3.184.103 – 10.3.184.103	10.3.184.103
105	10.3.184.104/32	10.3.184.104 – 10.3.184.104	10.3.184.104
106	10.3.184.105/32	10.3.184.105 – 10.3.184.105	10.3.184.105
107	10.3.184.106/32	10.3.184.106 – 10.3.184.106	10.3.184.106
108	10.3.184.107/32	10.3.184.107 – 10.3.184.107	10.3.184.107
109	10.3.184.108/32	10.3.184.108 – 10.3.184.108	10.3.184.108
110	10.3.184.109/32	10.3.184.109 – 10.3.184.109	10.3.184.109
111	10.3.184.110/32	10.3.184.110 – 10.3.184.110	10.3.184.110
112	10.3.184.111/32	10.3.184.111 – 10.3.184.111	10.3.184.111
113	10.3.184.112/32	10.3.184.112 – 10.3.184.112	10.3.184.112
114	10.3.184.113/32	10.3.184.113 – 10.3.184.113	10.3.184.113
115	10.3.184.114/32	10.3.184.114 – 10.3.184.114	10.3.184.114
116	10.3.184.115/32	10.3.184.115 – 10.3.184.115	10.3.184.115
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123	10.3.184.122/32	10.3.184.122 – 10.3.184.122	10.3.184.122
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126	10.3.184.125/32	10.3.184.125 – 10.3.184.125	10.3.184.125
127	10.3.184.126/32	10.3.184.126 – 10.3.184.126	10.3.184.126
128	10.3.184.127/32	10.3.184.127 – 10.3.184.127	10.3.184.127
129	10.3.184.128/32	10.3.184.128 – 10.3.184.128	10.3.184.128
130	10.3.184.129/32	10.3.184.129 – 10.3.184.129	10.3.184.129
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132	10.3.184.131/32	10.3.184.131 – 10.3.184.131	10.3.184.131
133	10.3.184.132/32	10.3.184.132 – 10.3.184.132	10.3.184.132
134	10.3.184.133/32	10.3.184.133 – 10.3.184.133	10.3.184.133
135	10.3.184.134/32	10.3.184.134 – 10.3.184.134	10.3.184.134
136	10.3.184.135/32	10.3.184.135 – 10.3.184.135	10.3.184.135
137	10.3.184.136/32	10.3.184.136 – 10.3.184.136	10.3.184.136
138	10.3.184.137/32	10.3.184.137 – 10.3.184.137	10.3.184.137
139	10.3.184.138/32	10.3.184.138 – 10.3.184.138	10.3.184.138
140	10.3.184.139/32	10.3.184.139 – 10.3.184.139	10.3.184.139
141	10.3.184.140/32	10.3.184.140 – 10.3.184.140	10.3.184.140
142	10.3.184.141/32	10.3.184.141 – 10.3.184.141	10.3.184.141
143	10.3.184.142/32	10.3.184.142 – 10.3.184.142	10.3.184.142
144	10.3.184.143/32	10.3.184.143 – 10.3.184.143	10.3.184.143
145	10.3.184.144/32	10.3.184.144 – 10.3.184.144	10.3.184.144
146	10.3.184.145/32	10.3.184.145 – 10.3.184.145	10.3.184.145
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210	10.3.184.209/32	10.3.184.209 – 10.3.184.209	10.3.184.209
211	10.3.184.210/32	10.3.184.210 – 10.3.184.210	10.3.184.210
212	10.3.184.211/32	10.3.184.211 – 10.3.184.211	10.3.184.211
213	10.3.184.212/32	10.3.184.212 – 10.3.184.212	10.3.184.212
214	10.3.184.213/32	10.3.184.213 – 10.3.184.213	10.3.184.213
215	10.3.184.214/32	10.3.184.214 – 10.3.184.214	10.3.184.214
216	10.3.184.215/32	10.3.184.215 – 10.3.184.215	10.3.184.215
217	10.3.184.216/32	10.3.184.216 – 10.3.184.216	10.3.184.216
218	10.3.184.217/32	10.3.184.217 – 10.3.184.217	10.3.184.217
219	10.3.184.218/32	10.3.184.218 – 10.3.184.218	10.3.184.218
220	10.3.184.219/32	10.3.184.219 – 10.3.184.219	10.3.184.219
221	10.3.184.220/32	10.3.184.220 – 10.3.184.220	10.3.184.220
222	10.3.184.221/32	10.3.184.221 – 10.3.184.221	10.3.184.221
223	10.3.184.222/32	10.3.184.222 – 10.3.184.222	10.3.184.222
224	10.3.184.223/32	10.3.184.223 – 10.3.184.223	10.3.184.223
225	10.3.184.224/32	10.3.184.224 – 10.3.184.224	10.3.184.224
226	10.3.184.225/32	10.3.184.225 – 10.3.184.225	10.3.184.225
227	10.3.184.226/32	10.3.184.226 – 10.3.184.226	10.3.184.226
228	10.3.184.227/32	10.3.184.227 – 10.3.184.227	10.3.184.227
229	10.3.184.228/32	10.3.184.228 – 10.3.184.228	10.3.184.228
230	10.3.184.229/32	10.3.184.229 – 10.3.184.229	10.3.184.229
231	10.3.184.230/32	10.3.184.230 – 10.3.184.230	10.3.184.230
232	10.3.184.231/32	10.3.184.231 – 10.3.184.231	10.3.184.231
233	10.3.184.232/32	10.3.184.232 – 10.3.184.232	10.3.184.232
234	10.3.184.233/32	10.3.184.233 – 10.3.184.233	10.3.184.233
235	10.3.184.234/32	10.3.184.234 – 10.3.184.234	10.3.184.234
236	10.3.184.235/32	10.3.184.235 – 10.3.184.235	10.3.184.235
237	10.3.184.236/32	10.3.184.236 – 10.3.184.236	10.3.184.236
238	10.3.184.237/32	10.3.184.237 – 10.3.184.237	10.3.184.237
239	10.3.184.238/32	10.3.184.238 – 10.3.184.238	10.3.184.238
240	10.3.184.239/32	10.3.184.239 – 10.3.184.239	10.3.184.239
241	10.3.184.240/32	10.3.184.240 – 10.3.184.240	10.3.184.240
242	10.3.184.241/32	10.3.184.241 – 10.3.184.241	10.3.184.241
243	10.3.184.242/32	10.3.184.242 – 10.3.184.242	10.3.184.242
244	10.3.184.243/32	10.3.184.243 – 10.3.184.243	10.3.184.243
245	10.3.184.244/32	10.3.184.244 – 10.3.184.244	10.3.184.244
246	10.3.184.245/32	10.3.184.245 – 10.3.184.245	10.3.184.245
247	10.3.184.246/32	10.3.184.246 – 10.3.184.246	10.3.184.246
248	10.3.184.247/32	10.3.184.247 – 10.3.184.247	10.3.184.247
249	10.3.184.248/32	10.3.184.248 – 10.3.184.248	10.3.184.248
250	10.3.184.249/32	10.3.184.249 – 10.3.184.249	10.3.184.249
251	10.3.184.250/32	10.3.184.250 – 10.3.184.250	10.3.184.250
252	10.3.184.251/32	10.3.184.251 – 10.3.184.251	10.3.184.251
253	10.3.184.252/32	10.3.184.252 – 10.3.184.252	10.3.184.252
254	10.3.184.253/32	10.3.184.253 – 10.3.184.253	10.3.184.253
255	10.3.184.254/32	10.3.184.254 – 10.3.184.254	10.3.184.254
256	10.3.184.255/32	10.3.184.255 – 10.3.184.255	10.3.184.255

showing 256 of 2,048

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →