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)10.166.18.0/24

network10.166.18.0/24

broadcast10.166.18.255

first host10.166.18.1

last host10.166.18.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.18.0/24

address00001010.10100110.00010010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.00010010.00000000

broadcast00001010.10100110.00010010.11111111

green = network part, grey = host part

hex0x0aa61200

decimal178655744

reverse dns0.18.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:1200

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.166.18.0/32	10.166.18.0 – 10.166.18.0	10.166.18.0
2	10.166.18.1/32	10.166.18.1 – 10.166.18.1	10.166.18.1
3	10.166.18.2/32	10.166.18.2 – 10.166.18.2	10.166.18.2
4	10.166.18.3/32	10.166.18.3 – 10.166.18.3	10.166.18.3
5	10.166.18.4/32	10.166.18.4 – 10.166.18.4	10.166.18.4
6	10.166.18.5/32	10.166.18.5 – 10.166.18.5	10.166.18.5
7	10.166.18.6/32	10.166.18.6 – 10.166.18.6	10.166.18.6
8	10.166.18.7/32	10.166.18.7 – 10.166.18.7	10.166.18.7
9	10.166.18.8/32	10.166.18.8 – 10.166.18.8	10.166.18.8
10	10.166.18.9/32	10.166.18.9 – 10.166.18.9	10.166.18.9
11	10.166.18.10/32	10.166.18.10 – 10.166.18.10	10.166.18.10
12	10.166.18.11/32	10.166.18.11 – 10.166.18.11	10.166.18.11
13	10.166.18.12/32	10.166.18.12 – 10.166.18.12	10.166.18.12
14	10.166.18.13/32	10.166.18.13 – 10.166.18.13	10.166.18.13
15	10.166.18.14/32	10.166.18.14 – 10.166.18.14	10.166.18.14
16	10.166.18.15/32	10.166.18.15 – 10.166.18.15	10.166.18.15
17	10.166.18.16/32	10.166.18.16 – 10.166.18.16	10.166.18.16
18	10.166.18.17/32	10.166.18.17 – 10.166.18.17	10.166.18.17
19	10.166.18.18/32	10.166.18.18 – 10.166.18.18	10.166.18.18
20	10.166.18.19/32	10.166.18.19 – 10.166.18.19	10.166.18.19
21	10.166.18.20/32	10.166.18.20 – 10.166.18.20	10.166.18.20
22	10.166.18.21/32	10.166.18.21 – 10.166.18.21	10.166.18.21
23	10.166.18.22/32	10.166.18.22 – 10.166.18.22	10.166.18.22
24	10.166.18.23/32	10.166.18.23 – 10.166.18.23	10.166.18.23
25	10.166.18.24/32	10.166.18.24 – 10.166.18.24	10.166.18.24
26	10.166.18.25/32	10.166.18.25 – 10.166.18.25	10.166.18.25
27	10.166.18.26/32	10.166.18.26 – 10.166.18.26	10.166.18.26
28	10.166.18.27/32	10.166.18.27 – 10.166.18.27	10.166.18.27
29	10.166.18.28/32	10.166.18.28 – 10.166.18.28	10.166.18.28
30	10.166.18.29/32	10.166.18.29 – 10.166.18.29	10.166.18.29
31	10.166.18.30/32	10.166.18.30 – 10.166.18.30	10.166.18.30
32	10.166.18.31/32	10.166.18.31 – 10.166.18.31	10.166.18.31
33	10.166.18.32/32	10.166.18.32 – 10.166.18.32	10.166.18.32
34	10.166.18.33/32	10.166.18.33 – 10.166.18.33	10.166.18.33
35	10.166.18.34/32	10.166.18.34 – 10.166.18.34	10.166.18.34
36	10.166.18.35/32	10.166.18.35 – 10.166.18.35	10.166.18.35
37	10.166.18.36/32	10.166.18.36 – 10.166.18.36	10.166.18.36
38	10.166.18.37/32	10.166.18.37 – 10.166.18.37	10.166.18.37
39	10.166.18.38/32	10.166.18.38 – 10.166.18.38	10.166.18.38
40	10.166.18.39/32	10.166.18.39 – 10.166.18.39	10.166.18.39
41	10.166.18.40/32	10.166.18.40 – 10.166.18.40	10.166.18.40
42	10.166.18.41/32	10.166.18.41 – 10.166.18.41	10.166.18.41
43	10.166.18.42/32	10.166.18.42 – 10.166.18.42	10.166.18.42
44	10.166.18.43/32	10.166.18.43 – 10.166.18.43	10.166.18.43
45	10.166.18.44/32	10.166.18.44 – 10.166.18.44	10.166.18.44
46	10.166.18.45/32	10.166.18.45 – 10.166.18.45	10.166.18.45
47	10.166.18.46/32	10.166.18.46 – 10.166.18.46	10.166.18.46
48	10.166.18.47/32	10.166.18.47 – 10.166.18.47	10.166.18.47
49	10.166.18.48/32	10.166.18.48 – 10.166.18.48	10.166.18.48
50	10.166.18.49/32	10.166.18.49 – 10.166.18.49	10.166.18.49
51	10.166.18.50/32	10.166.18.50 – 10.166.18.50	10.166.18.50
52	10.166.18.51/32	10.166.18.51 – 10.166.18.51	10.166.18.51
53	10.166.18.52/32	10.166.18.52 – 10.166.18.52	10.166.18.52
54	10.166.18.53/32	10.166.18.53 – 10.166.18.53	10.166.18.53
55	10.166.18.54/32	10.166.18.54 – 10.166.18.54	10.166.18.54
56	10.166.18.55/32	10.166.18.55 – 10.166.18.55	10.166.18.55
57	10.166.18.56/32	10.166.18.56 – 10.166.18.56	10.166.18.56
58	10.166.18.57/32	10.166.18.57 – 10.166.18.57	10.166.18.57
59	10.166.18.58/32	10.166.18.58 – 10.166.18.58	10.166.18.58
60	10.166.18.59/32	10.166.18.59 – 10.166.18.59	10.166.18.59
61	10.166.18.60/32	10.166.18.60 – 10.166.18.60	10.166.18.60
62	10.166.18.61/32	10.166.18.61 – 10.166.18.61	10.166.18.61
63	10.166.18.62/32	10.166.18.62 – 10.166.18.62	10.166.18.62
64	10.166.18.63/32	10.166.18.63 – 10.166.18.63	10.166.18.63
65	10.166.18.64/32	10.166.18.64 – 10.166.18.64	10.166.18.64
66	10.166.18.65/32	10.166.18.65 – 10.166.18.65	10.166.18.65
67	10.166.18.66/32	10.166.18.66 – 10.166.18.66	10.166.18.66
68	10.166.18.67/32	10.166.18.67 – 10.166.18.67	10.166.18.67
69	10.166.18.68/32	10.166.18.68 – 10.166.18.68	10.166.18.68
70	10.166.18.69/32	10.166.18.69 – 10.166.18.69	10.166.18.69
71	10.166.18.70/32	10.166.18.70 – 10.166.18.70	10.166.18.70
72	10.166.18.71/32	10.166.18.71 – 10.166.18.71	10.166.18.71
73	10.166.18.72/32	10.166.18.72 – 10.166.18.72	10.166.18.72
74	10.166.18.73/32	10.166.18.73 – 10.166.18.73	10.166.18.73
75	10.166.18.74/32	10.166.18.74 – 10.166.18.74	10.166.18.74
76	10.166.18.75/32	10.166.18.75 – 10.166.18.75	10.166.18.75
77	10.166.18.76/32	10.166.18.76 – 10.166.18.76	10.166.18.76
78	10.166.18.77/32	10.166.18.77 – 10.166.18.77	10.166.18.77
79	10.166.18.78/32	10.166.18.78 – 10.166.18.78	10.166.18.78
80	10.166.18.79/32	10.166.18.79 – 10.166.18.79	10.166.18.79
81	10.166.18.80/32	10.166.18.80 – 10.166.18.80	10.166.18.80
82	10.166.18.81/32	10.166.18.81 – 10.166.18.81	10.166.18.81
83	10.166.18.82/32	10.166.18.82 – 10.166.18.82	10.166.18.82
84	10.166.18.83/32	10.166.18.83 – 10.166.18.83	10.166.18.83
85	10.166.18.84/32	10.166.18.84 – 10.166.18.84	10.166.18.84
86	10.166.18.85/32	10.166.18.85 – 10.166.18.85	10.166.18.85
87	10.166.18.86/32	10.166.18.86 – 10.166.18.86	10.166.18.86
88	10.166.18.87/32	10.166.18.87 – 10.166.18.87	10.166.18.87
89	10.166.18.88/32	10.166.18.88 – 10.166.18.88	10.166.18.88
90	10.166.18.89/32	10.166.18.89 – 10.166.18.89	10.166.18.89
91	10.166.18.90/32	10.166.18.90 – 10.166.18.90	10.166.18.90
92	10.166.18.91/32	10.166.18.91 – 10.166.18.91	10.166.18.91
93	10.166.18.92/32	10.166.18.92 – 10.166.18.92	10.166.18.92
94	10.166.18.93/32	10.166.18.93 – 10.166.18.93	10.166.18.93
95	10.166.18.94/32	10.166.18.94 – 10.166.18.94	10.166.18.94
96	10.166.18.95/32	10.166.18.95 – 10.166.18.95	10.166.18.95
97	10.166.18.96/32	10.166.18.96 – 10.166.18.96	10.166.18.96
98	10.166.18.97/32	10.166.18.97 – 10.166.18.97	10.166.18.97
99	10.166.18.98/32	10.166.18.98 – 10.166.18.98	10.166.18.98
100	10.166.18.99/32	10.166.18.99 – 10.166.18.99	10.166.18.99
101	10.166.18.100/32	10.166.18.100 – 10.166.18.100	10.166.18.100
102	10.166.18.101/32	10.166.18.101 – 10.166.18.101	10.166.18.101
103	10.166.18.102/32	10.166.18.102 – 10.166.18.102	10.166.18.102
104	10.166.18.103/32	10.166.18.103 – 10.166.18.103	10.166.18.103
105	10.166.18.104/32	10.166.18.104 – 10.166.18.104	10.166.18.104
106	10.166.18.105/32	10.166.18.105 – 10.166.18.105	10.166.18.105
107	10.166.18.106/32	10.166.18.106 – 10.166.18.106	10.166.18.106
108	10.166.18.107/32	10.166.18.107 – 10.166.18.107	10.166.18.107
109	10.166.18.108/32	10.166.18.108 – 10.166.18.108	10.166.18.108
110	10.166.18.109/32	10.166.18.109 – 10.166.18.109	10.166.18.109
111	10.166.18.110/32	10.166.18.110 – 10.166.18.110	10.166.18.110
112	10.166.18.111/32	10.166.18.111 – 10.166.18.111	10.166.18.111
113	10.166.18.112/32	10.166.18.112 – 10.166.18.112	10.166.18.112
114	10.166.18.113/32	10.166.18.113 – 10.166.18.113	10.166.18.113
115	10.166.18.114/32	10.166.18.114 – 10.166.18.114	10.166.18.114
116	10.166.18.115/32	10.166.18.115 – 10.166.18.115	10.166.18.115
117	10.166.18.116/32	10.166.18.116 – 10.166.18.116	10.166.18.116
118	10.166.18.117/32	10.166.18.117 – 10.166.18.117	10.166.18.117
119	10.166.18.118/32	10.166.18.118 – 10.166.18.118	10.166.18.118
120	10.166.18.119/32	10.166.18.119 – 10.166.18.119	10.166.18.119
121	10.166.18.120/32	10.166.18.120 – 10.166.18.120	10.166.18.120
122	10.166.18.121/32	10.166.18.121 – 10.166.18.121	10.166.18.121
123	10.166.18.122/32	10.166.18.122 – 10.166.18.122	10.166.18.122
124	10.166.18.123/32	10.166.18.123 – 10.166.18.123	10.166.18.123
125	10.166.18.124/32	10.166.18.124 – 10.166.18.124	10.166.18.124
126	10.166.18.125/32	10.166.18.125 – 10.166.18.125	10.166.18.125
127	10.166.18.126/32	10.166.18.126 – 10.166.18.126	10.166.18.126
128	10.166.18.127/32	10.166.18.127 – 10.166.18.127	10.166.18.127
129	10.166.18.128/32	10.166.18.128 – 10.166.18.128	10.166.18.128
130	10.166.18.129/32	10.166.18.129 – 10.166.18.129	10.166.18.129
131	10.166.18.130/32	10.166.18.130 – 10.166.18.130	10.166.18.130
132	10.166.18.131/32	10.166.18.131 – 10.166.18.131	10.166.18.131
133	10.166.18.132/32	10.166.18.132 – 10.166.18.132	10.166.18.132
134	10.166.18.133/32	10.166.18.133 – 10.166.18.133	10.166.18.133
135	10.166.18.134/32	10.166.18.134 – 10.166.18.134	10.166.18.134
136	10.166.18.135/32	10.166.18.135 – 10.166.18.135	10.166.18.135
137	10.166.18.136/32	10.166.18.136 – 10.166.18.136	10.166.18.136
138	10.166.18.137/32	10.166.18.137 – 10.166.18.137	10.166.18.137
139	10.166.18.138/32	10.166.18.138 – 10.166.18.138	10.166.18.138
140	10.166.18.139/32	10.166.18.139 – 10.166.18.139	10.166.18.139
141	10.166.18.140/32	10.166.18.140 – 10.166.18.140	10.166.18.140
142	10.166.18.141/32	10.166.18.141 – 10.166.18.141	10.166.18.141
143	10.166.18.142/32	10.166.18.142 – 10.166.18.142	10.166.18.142
144	10.166.18.143/32	10.166.18.143 – 10.166.18.143	10.166.18.143
145	10.166.18.144/32	10.166.18.144 – 10.166.18.144	10.166.18.144
146	10.166.18.145/32	10.166.18.145 – 10.166.18.145	10.166.18.145
147	10.166.18.146/32	10.166.18.146 – 10.166.18.146	10.166.18.146
148	10.166.18.147/32	10.166.18.147 – 10.166.18.147	10.166.18.147
149	10.166.18.148/32	10.166.18.148 – 10.166.18.148	10.166.18.148
150	10.166.18.149/32	10.166.18.149 – 10.166.18.149	10.166.18.149
151	10.166.18.150/32	10.166.18.150 – 10.166.18.150	10.166.18.150
152	10.166.18.151/32	10.166.18.151 – 10.166.18.151	10.166.18.151
153	10.166.18.152/32	10.166.18.152 – 10.166.18.152	10.166.18.152
154	10.166.18.153/32	10.166.18.153 – 10.166.18.153	10.166.18.153
155	10.166.18.154/32	10.166.18.154 – 10.166.18.154	10.166.18.154
156	10.166.18.155/32	10.166.18.155 – 10.166.18.155	10.166.18.155
157	10.166.18.156/32	10.166.18.156 – 10.166.18.156	10.166.18.156
158	10.166.18.157/32	10.166.18.157 – 10.166.18.157	10.166.18.157
159	10.166.18.158/32	10.166.18.158 – 10.166.18.158	10.166.18.158
160	10.166.18.159/32	10.166.18.159 – 10.166.18.159	10.166.18.159
161	10.166.18.160/32	10.166.18.160 – 10.166.18.160	10.166.18.160
162	10.166.18.161/32	10.166.18.161 – 10.166.18.161	10.166.18.161
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165	10.166.18.164/32	10.166.18.164 – 10.166.18.164	10.166.18.164
166	10.166.18.165/32	10.166.18.165 – 10.166.18.165	10.166.18.165
167	10.166.18.166/32	10.166.18.166 – 10.166.18.166	10.166.18.166
168	10.166.18.167/32	10.166.18.167 – 10.166.18.167	10.166.18.167
169	10.166.18.168/32	10.166.18.168 – 10.166.18.168	10.166.18.168
170	10.166.18.169/32	10.166.18.169 – 10.166.18.169	10.166.18.169
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210	10.166.18.209/32	10.166.18.209 – 10.166.18.209	10.166.18.209
211	10.166.18.210/32	10.166.18.210 – 10.166.18.210	10.166.18.210
212	10.166.18.211/32	10.166.18.211 – 10.166.18.211	10.166.18.211
213	10.166.18.212/32	10.166.18.212 – 10.166.18.212	10.166.18.212
214	10.166.18.213/32	10.166.18.213 – 10.166.18.213	10.166.18.213
215	10.166.18.214/32	10.166.18.214 – 10.166.18.214	10.166.18.214
216	10.166.18.215/32	10.166.18.215 – 10.166.18.215	10.166.18.215
217	10.166.18.216/32	10.166.18.216 – 10.166.18.216	10.166.18.216
218	10.166.18.217/32	10.166.18.217 – 10.166.18.217	10.166.18.217
219	10.166.18.218/32	10.166.18.218 – 10.166.18.218	10.166.18.218
220	10.166.18.219/32	10.166.18.219 – 10.166.18.219	10.166.18.219
221	10.166.18.220/32	10.166.18.220 – 10.166.18.220	10.166.18.220
222	10.166.18.221/32	10.166.18.221 – 10.166.18.221	10.166.18.221
223	10.166.18.222/32	10.166.18.222 – 10.166.18.222	10.166.18.222
224	10.166.18.223/32	10.166.18.223 – 10.166.18.223	10.166.18.223
225	10.166.18.224/32	10.166.18.224 – 10.166.18.224	10.166.18.224
226	10.166.18.225/32	10.166.18.225 – 10.166.18.225	10.166.18.225
227	10.166.18.226/32	10.166.18.226 – 10.166.18.226	10.166.18.226
228	10.166.18.227/32	10.166.18.227 – 10.166.18.227	10.166.18.227
229	10.166.18.228/32	10.166.18.228 – 10.166.18.228	10.166.18.228
230	10.166.18.229/32	10.166.18.229 – 10.166.18.229	10.166.18.229
231	10.166.18.230/32	10.166.18.230 – 10.166.18.230	10.166.18.230
232	10.166.18.231/32	10.166.18.231 – 10.166.18.231	10.166.18.231
233	10.166.18.232/32	10.166.18.232 – 10.166.18.232	10.166.18.232
234	10.166.18.233/32	10.166.18.233 – 10.166.18.233	10.166.18.233
235	10.166.18.234/32	10.166.18.234 – 10.166.18.234	10.166.18.234
236	10.166.18.235/32	10.166.18.235 – 10.166.18.235	10.166.18.235
237	10.166.18.236/32	10.166.18.236 – 10.166.18.236	10.166.18.236
238	10.166.18.237/32	10.166.18.237 – 10.166.18.237	10.166.18.237
239	10.166.18.238/32	10.166.18.238 – 10.166.18.238	10.166.18.238
240	10.166.18.239/32	10.166.18.239 – 10.166.18.239	10.166.18.239
241	10.166.18.240/32	10.166.18.240 – 10.166.18.240	10.166.18.240
242	10.166.18.241/32	10.166.18.241 – 10.166.18.241	10.166.18.241
243	10.166.18.242/32	10.166.18.242 – 10.166.18.242	10.166.18.242
244	10.166.18.243/32	10.166.18.243 – 10.166.18.243	10.166.18.243
245	10.166.18.244/32	10.166.18.244 – 10.166.18.244	10.166.18.244
246	10.166.18.245/32	10.166.18.245 – 10.166.18.245	10.166.18.245
247	10.166.18.246/32	10.166.18.246 – 10.166.18.246	10.166.18.246
248	10.166.18.247/32	10.166.18.247 – 10.166.18.247	10.166.18.247
249	10.166.18.248/32	10.166.18.248 – 10.166.18.248	10.166.18.248
250	10.166.18.249/32	10.166.18.249 – 10.166.18.249	10.166.18.249
251	10.166.18.250/32	10.166.18.250 – 10.166.18.250	10.166.18.250
252	10.166.18.251/32	10.166.18.251 – 10.166.18.251	10.166.18.251
253	10.166.18.252/32	10.166.18.252 – 10.166.18.252	10.166.18.252
254	10.166.18.253/32	10.166.18.253 – 10.166.18.253	10.166.18.253
255	10.166.18.254/32	10.166.18.254 – 10.166.18.254	10.166.18.254
256	10.166.18.255/32	10.166.18.255 – 10.166.18.255	10.166.18.255

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 →