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)10.3.47.0/24

network10.3.47.0/24

broadcast10.3.47.255

first host10.3.47.1

last host10.3.47.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.47.0/24

address00001010.00000011.00101111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00101111.00000000

broadcast00001010.00000011.00101111.11111111

green = network part, grey = host part

hex0x0a032f00

decimal167980800

reverse dns0.47.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2f00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.47.0/32	10.3.47.0 – 10.3.47.0	10.3.47.0
2	10.3.47.1/32	10.3.47.1 – 10.3.47.1	10.3.47.1
3	10.3.47.2/32	10.3.47.2 – 10.3.47.2	10.3.47.2
4	10.3.47.3/32	10.3.47.3 – 10.3.47.3	10.3.47.3
5	10.3.47.4/32	10.3.47.4 – 10.3.47.4	10.3.47.4
6	10.3.47.5/32	10.3.47.5 – 10.3.47.5	10.3.47.5
7	10.3.47.6/32	10.3.47.6 – 10.3.47.6	10.3.47.6
8	10.3.47.7/32	10.3.47.7 – 10.3.47.7	10.3.47.7
9	10.3.47.8/32	10.3.47.8 – 10.3.47.8	10.3.47.8
10	10.3.47.9/32	10.3.47.9 – 10.3.47.9	10.3.47.9
11	10.3.47.10/32	10.3.47.10 – 10.3.47.10	10.3.47.10
12	10.3.47.11/32	10.3.47.11 – 10.3.47.11	10.3.47.11
13	10.3.47.12/32	10.3.47.12 – 10.3.47.12	10.3.47.12
14	10.3.47.13/32	10.3.47.13 – 10.3.47.13	10.3.47.13
15	10.3.47.14/32	10.3.47.14 – 10.3.47.14	10.3.47.14
16	10.3.47.15/32	10.3.47.15 – 10.3.47.15	10.3.47.15
17	10.3.47.16/32	10.3.47.16 – 10.3.47.16	10.3.47.16
18	10.3.47.17/32	10.3.47.17 – 10.3.47.17	10.3.47.17
19	10.3.47.18/32	10.3.47.18 – 10.3.47.18	10.3.47.18
20	10.3.47.19/32	10.3.47.19 – 10.3.47.19	10.3.47.19
21	10.3.47.20/32	10.3.47.20 – 10.3.47.20	10.3.47.20
22	10.3.47.21/32	10.3.47.21 – 10.3.47.21	10.3.47.21
23	10.3.47.22/32	10.3.47.22 – 10.3.47.22	10.3.47.22
24	10.3.47.23/32	10.3.47.23 – 10.3.47.23	10.3.47.23
25	10.3.47.24/32	10.3.47.24 – 10.3.47.24	10.3.47.24
26	10.3.47.25/32	10.3.47.25 – 10.3.47.25	10.3.47.25
27	10.3.47.26/32	10.3.47.26 – 10.3.47.26	10.3.47.26
28	10.3.47.27/32	10.3.47.27 – 10.3.47.27	10.3.47.27
29	10.3.47.28/32	10.3.47.28 – 10.3.47.28	10.3.47.28
30	10.3.47.29/32	10.3.47.29 – 10.3.47.29	10.3.47.29
31	10.3.47.30/32	10.3.47.30 – 10.3.47.30	10.3.47.30
32	10.3.47.31/32	10.3.47.31 – 10.3.47.31	10.3.47.31
33	10.3.47.32/32	10.3.47.32 – 10.3.47.32	10.3.47.32
34	10.3.47.33/32	10.3.47.33 – 10.3.47.33	10.3.47.33
35	10.3.47.34/32	10.3.47.34 – 10.3.47.34	10.3.47.34
36	10.3.47.35/32	10.3.47.35 – 10.3.47.35	10.3.47.35
37	10.3.47.36/32	10.3.47.36 – 10.3.47.36	10.3.47.36
38	10.3.47.37/32	10.3.47.37 – 10.3.47.37	10.3.47.37
39	10.3.47.38/32	10.3.47.38 – 10.3.47.38	10.3.47.38
40	10.3.47.39/32	10.3.47.39 – 10.3.47.39	10.3.47.39
41	10.3.47.40/32	10.3.47.40 – 10.3.47.40	10.3.47.40
42	10.3.47.41/32	10.3.47.41 – 10.3.47.41	10.3.47.41
43	10.3.47.42/32	10.3.47.42 – 10.3.47.42	10.3.47.42
44	10.3.47.43/32	10.3.47.43 – 10.3.47.43	10.3.47.43
45	10.3.47.44/32	10.3.47.44 – 10.3.47.44	10.3.47.44
46	10.3.47.45/32	10.3.47.45 – 10.3.47.45	10.3.47.45
47	10.3.47.46/32	10.3.47.46 – 10.3.47.46	10.3.47.46
48	10.3.47.47/32	10.3.47.47 – 10.3.47.47	10.3.47.47
49	10.3.47.48/32	10.3.47.48 – 10.3.47.48	10.3.47.48
50	10.3.47.49/32	10.3.47.49 – 10.3.47.49	10.3.47.49
51	10.3.47.50/32	10.3.47.50 – 10.3.47.50	10.3.47.50
52	10.3.47.51/32	10.3.47.51 – 10.3.47.51	10.3.47.51
53	10.3.47.52/32	10.3.47.52 – 10.3.47.52	10.3.47.52
54	10.3.47.53/32	10.3.47.53 – 10.3.47.53	10.3.47.53
55	10.3.47.54/32	10.3.47.54 – 10.3.47.54	10.3.47.54
56	10.3.47.55/32	10.3.47.55 – 10.3.47.55	10.3.47.55
57	10.3.47.56/32	10.3.47.56 – 10.3.47.56	10.3.47.56
58	10.3.47.57/32	10.3.47.57 – 10.3.47.57	10.3.47.57
59	10.3.47.58/32	10.3.47.58 – 10.3.47.58	10.3.47.58
60	10.3.47.59/32	10.3.47.59 – 10.3.47.59	10.3.47.59
61	10.3.47.60/32	10.3.47.60 – 10.3.47.60	10.3.47.60
62	10.3.47.61/32	10.3.47.61 – 10.3.47.61	10.3.47.61
63	10.3.47.62/32	10.3.47.62 – 10.3.47.62	10.3.47.62
64	10.3.47.63/32	10.3.47.63 – 10.3.47.63	10.3.47.63
65	10.3.47.64/32	10.3.47.64 – 10.3.47.64	10.3.47.64
66	10.3.47.65/32	10.3.47.65 – 10.3.47.65	10.3.47.65
67	10.3.47.66/32	10.3.47.66 – 10.3.47.66	10.3.47.66
68	10.3.47.67/32	10.3.47.67 – 10.3.47.67	10.3.47.67
69	10.3.47.68/32	10.3.47.68 – 10.3.47.68	10.3.47.68
70	10.3.47.69/32	10.3.47.69 – 10.3.47.69	10.3.47.69
71	10.3.47.70/32	10.3.47.70 – 10.3.47.70	10.3.47.70
72	10.3.47.71/32	10.3.47.71 – 10.3.47.71	10.3.47.71
73	10.3.47.72/32	10.3.47.72 – 10.3.47.72	10.3.47.72
74	10.3.47.73/32	10.3.47.73 – 10.3.47.73	10.3.47.73
75	10.3.47.74/32	10.3.47.74 – 10.3.47.74	10.3.47.74
76	10.3.47.75/32	10.3.47.75 – 10.3.47.75	10.3.47.75
77	10.3.47.76/32	10.3.47.76 – 10.3.47.76	10.3.47.76
78	10.3.47.77/32	10.3.47.77 – 10.3.47.77	10.3.47.77
79	10.3.47.78/32	10.3.47.78 – 10.3.47.78	10.3.47.78
80	10.3.47.79/32	10.3.47.79 – 10.3.47.79	10.3.47.79
81	10.3.47.80/32	10.3.47.80 – 10.3.47.80	10.3.47.80
82	10.3.47.81/32	10.3.47.81 – 10.3.47.81	10.3.47.81
83	10.3.47.82/32	10.3.47.82 – 10.3.47.82	10.3.47.82
84	10.3.47.83/32	10.3.47.83 – 10.3.47.83	10.3.47.83
85	10.3.47.84/32	10.3.47.84 – 10.3.47.84	10.3.47.84
86	10.3.47.85/32	10.3.47.85 – 10.3.47.85	10.3.47.85
87	10.3.47.86/32	10.3.47.86 – 10.3.47.86	10.3.47.86
88	10.3.47.87/32	10.3.47.87 – 10.3.47.87	10.3.47.87
89	10.3.47.88/32	10.3.47.88 – 10.3.47.88	10.3.47.88
90	10.3.47.89/32	10.3.47.89 – 10.3.47.89	10.3.47.89
91	10.3.47.90/32	10.3.47.90 – 10.3.47.90	10.3.47.90
92	10.3.47.91/32	10.3.47.91 – 10.3.47.91	10.3.47.91
93	10.3.47.92/32	10.3.47.92 – 10.3.47.92	10.3.47.92
94	10.3.47.93/32	10.3.47.93 – 10.3.47.93	10.3.47.93
95	10.3.47.94/32	10.3.47.94 – 10.3.47.94	10.3.47.94
96	10.3.47.95/32	10.3.47.95 – 10.3.47.95	10.3.47.95
97	10.3.47.96/32	10.3.47.96 – 10.3.47.96	10.3.47.96
98	10.3.47.97/32	10.3.47.97 – 10.3.47.97	10.3.47.97
99	10.3.47.98/32	10.3.47.98 – 10.3.47.98	10.3.47.98
100	10.3.47.99/32	10.3.47.99 – 10.3.47.99	10.3.47.99
101	10.3.47.100/32	10.3.47.100 – 10.3.47.100	10.3.47.100
102	10.3.47.101/32	10.3.47.101 – 10.3.47.101	10.3.47.101
103	10.3.47.102/32	10.3.47.102 – 10.3.47.102	10.3.47.102
104	10.3.47.103/32	10.3.47.103 – 10.3.47.103	10.3.47.103
105	10.3.47.104/32	10.3.47.104 – 10.3.47.104	10.3.47.104
106	10.3.47.105/32	10.3.47.105 – 10.3.47.105	10.3.47.105
107	10.3.47.106/32	10.3.47.106 – 10.3.47.106	10.3.47.106
108	10.3.47.107/32	10.3.47.107 – 10.3.47.107	10.3.47.107
109	10.3.47.108/32	10.3.47.108 – 10.3.47.108	10.3.47.108
110	10.3.47.109/32	10.3.47.109 – 10.3.47.109	10.3.47.109
111	10.3.47.110/32	10.3.47.110 – 10.3.47.110	10.3.47.110
112	10.3.47.111/32	10.3.47.111 – 10.3.47.111	10.3.47.111
113	10.3.47.112/32	10.3.47.112 – 10.3.47.112	10.3.47.112
114	10.3.47.113/32	10.3.47.113 – 10.3.47.113	10.3.47.113
115	10.3.47.114/32	10.3.47.114 – 10.3.47.114	10.3.47.114
116	10.3.47.115/32	10.3.47.115 – 10.3.47.115	10.3.47.115
117	10.3.47.116/32	10.3.47.116 – 10.3.47.116	10.3.47.116
118	10.3.47.117/32	10.3.47.117 – 10.3.47.117	10.3.47.117
119	10.3.47.118/32	10.3.47.118 – 10.3.47.118	10.3.47.118
120	10.3.47.119/32	10.3.47.119 – 10.3.47.119	10.3.47.119
121	10.3.47.120/32	10.3.47.120 – 10.3.47.120	10.3.47.120
122	10.3.47.121/32	10.3.47.121 – 10.3.47.121	10.3.47.121
123	10.3.47.122/32	10.3.47.122 – 10.3.47.122	10.3.47.122
124	10.3.47.123/32	10.3.47.123 – 10.3.47.123	10.3.47.123
125	10.3.47.124/32	10.3.47.124 – 10.3.47.124	10.3.47.124
126	10.3.47.125/32	10.3.47.125 – 10.3.47.125	10.3.47.125
127	10.3.47.126/32	10.3.47.126 – 10.3.47.126	10.3.47.126
128	10.3.47.127/32	10.3.47.127 – 10.3.47.127	10.3.47.127
129	10.3.47.128/32	10.3.47.128 – 10.3.47.128	10.3.47.128
130	10.3.47.129/32	10.3.47.129 – 10.3.47.129	10.3.47.129
131	10.3.47.130/32	10.3.47.130 – 10.3.47.130	10.3.47.130
132	10.3.47.131/32	10.3.47.131 – 10.3.47.131	10.3.47.131
133	10.3.47.132/32	10.3.47.132 – 10.3.47.132	10.3.47.132
134	10.3.47.133/32	10.3.47.133 – 10.3.47.133	10.3.47.133
135	10.3.47.134/32	10.3.47.134 – 10.3.47.134	10.3.47.134
136	10.3.47.135/32	10.3.47.135 – 10.3.47.135	10.3.47.135
137	10.3.47.136/32	10.3.47.136 – 10.3.47.136	10.3.47.136
138	10.3.47.137/32	10.3.47.137 – 10.3.47.137	10.3.47.137
139	10.3.47.138/32	10.3.47.138 – 10.3.47.138	10.3.47.138
140	10.3.47.139/32	10.3.47.139 – 10.3.47.139	10.3.47.139
141	10.3.47.140/32	10.3.47.140 – 10.3.47.140	10.3.47.140
142	10.3.47.141/32	10.3.47.141 – 10.3.47.141	10.3.47.141
143	10.3.47.142/32	10.3.47.142 – 10.3.47.142	10.3.47.142
144	10.3.47.143/32	10.3.47.143 – 10.3.47.143	10.3.47.143
145	10.3.47.144/32	10.3.47.144 – 10.3.47.144	10.3.47.144
146	10.3.47.145/32	10.3.47.145 – 10.3.47.145	10.3.47.145
147	10.3.47.146/32	10.3.47.146 – 10.3.47.146	10.3.47.146
148	10.3.47.147/32	10.3.47.147 – 10.3.47.147	10.3.47.147
149	10.3.47.148/32	10.3.47.148 – 10.3.47.148	10.3.47.148
150	10.3.47.149/32	10.3.47.149 – 10.3.47.149	10.3.47.149
151	10.3.47.150/32	10.3.47.150 – 10.3.47.150	10.3.47.150
152	10.3.47.151/32	10.3.47.151 – 10.3.47.151	10.3.47.151
153	10.3.47.152/32	10.3.47.152 – 10.3.47.152	10.3.47.152
154	10.3.47.153/32	10.3.47.153 – 10.3.47.153	10.3.47.153
155	10.3.47.154/32	10.3.47.154 – 10.3.47.154	10.3.47.154
156	10.3.47.155/32	10.3.47.155 – 10.3.47.155	10.3.47.155
157	10.3.47.156/32	10.3.47.156 – 10.3.47.156	10.3.47.156
158	10.3.47.157/32	10.3.47.157 – 10.3.47.157	10.3.47.157
159	10.3.47.158/32	10.3.47.158 – 10.3.47.158	10.3.47.158
160	10.3.47.159/32	10.3.47.159 – 10.3.47.159	10.3.47.159
161	10.3.47.160/32	10.3.47.160 – 10.3.47.160	10.3.47.160
162	10.3.47.161/32	10.3.47.161 – 10.3.47.161	10.3.47.161
163	10.3.47.162/32	10.3.47.162 – 10.3.47.162	10.3.47.162
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210	10.3.47.209/32	10.3.47.209 – 10.3.47.209	10.3.47.209
211	10.3.47.210/32	10.3.47.210 – 10.3.47.210	10.3.47.210
212	10.3.47.211/32	10.3.47.211 – 10.3.47.211	10.3.47.211
213	10.3.47.212/32	10.3.47.212 – 10.3.47.212	10.3.47.212
214	10.3.47.213/32	10.3.47.213 – 10.3.47.213	10.3.47.213
215	10.3.47.214/32	10.3.47.214 – 10.3.47.214	10.3.47.214
216	10.3.47.215/32	10.3.47.215 – 10.3.47.215	10.3.47.215
217	10.3.47.216/32	10.3.47.216 – 10.3.47.216	10.3.47.216
218	10.3.47.217/32	10.3.47.217 – 10.3.47.217	10.3.47.217
219	10.3.47.218/32	10.3.47.218 – 10.3.47.218	10.3.47.218
220	10.3.47.219/32	10.3.47.219 – 10.3.47.219	10.3.47.219
221	10.3.47.220/32	10.3.47.220 – 10.3.47.220	10.3.47.220
222	10.3.47.221/32	10.3.47.221 – 10.3.47.221	10.3.47.221
223	10.3.47.222/32	10.3.47.222 – 10.3.47.222	10.3.47.222
224	10.3.47.223/32	10.3.47.223 – 10.3.47.223	10.3.47.223
225	10.3.47.224/32	10.3.47.224 – 10.3.47.224	10.3.47.224
226	10.3.47.225/32	10.3.47.225 – 10.3.47.225	10.3.47.225
227	10.3.47.226/32	10.3.47.226 – 10.3.47.226	10.3.47.226
228	10.3.47.227/32	10.3.47.227 – 10.3.47.227	10.3.47.227
229	10.3.47.228/32	10.3.47.228 – 10.3.47.228	10.3.47.228
230	10.3.47.229/32	10.3.47.229 – 10.3.47.229	10.3.47.229
231	10.3.47.230/32	10.3.47.230 – 10.3.47.230	10.3.47.230
232	10.3.47.231/32	10.3.47.231 – 10.3.47.231	10.3.47.231
233	10.3.47.232/32	10.3.47.232 – 10.3.47.232	10.3.47.232
234	10.3.47.233/32	10.3.47.233 – 10.3.47.233	10.3.47.233
235	10.3.47.234/32	10.3.47.234 – 10.3.47.234	10.3.47.234
236	10.3.47.235/32	10.3.47.235 – 10.3.47.235	10.3.47.235
237	10.3.47.236/32	10.3.47.236 – 10.3.47.236	10.3.47.236
238	10.3.47.237/32	10.3.47.237 – 10.3.47.237	10.3.47.237
239	10.3.47.238/32	10.3.47.238 – 10.3.47.238	10.3.47.238
240	10.3.47.239/32	10.3.47.239 – 10.3.47.239	10.3.47.239
241	10.3.47.240/32	10.3.47.240 – 10.3.47.240	10.3.47.240
242	10.3.47.241/32	10.3.47.241 – 10.3.47.241	10.3.47.241
243	10.3.47.242/32	10.3.47.242 – 10.3.47.242	10.3.47.242
244	10.3.47.243/32	10.3.47.243 – 10.3.47.243	10.3.47.243
245	10.3.47.244/32	10.3.47.244 – 10.3.47.244	10.3.47.244
246	10.3.47.245/32	10.3.47.245 – 10.3.47.245	10.3.47.245
247	10.3.47.246/32	10.3.47.246 – 10.3.47.246	10.3.47.246
248	10.3.47.247/32	10.3.47.247 – 10.3.47.247	10.3.47.247
249	10.3.47.248/32	10.3.47.248 – 10.3.47.248	10.3.47.248
250	10.3.47.249/32	10.3.47.249 – 10.3.47.249	10.3.47.249
251	10.3.47.250/32	10.3.47.250 – 10.3.47.250	10.3.47.250
252	10.3.47.251/32	10.3.47.251 – 10.3.47.251	10.3.47.251
253	10.3.47.252/32	10.3.47.252 – 10.3.47.252	10.3.47.252
254	10.3.47.253/32	10.3.47.253 – 10.3.47.253	10.3.47.253
255	10.3.47.254/32	10.3.47.254 – 10.3.47.254	10.3.47.254
256	10.3.47.255/32	10.3.47.255 – 10.3.47.255	10.3.47.255

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 →