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)10.166.28.0/23

network10.166.28.0/23

broadcast10.166.29.255

first host10.166.28.1

last host10.166.29.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.166.28.0/23

address00001010.10100110.00011100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100110.00011100.00000000

broadcast00001010.10100110.00011101.11111111

green = network part, grey = host part

hex0x0aa61c00

decimal178658304

reverse dns0.28.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:1c00

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.166.28.0/32	10.166.28.0 – 10.166.28.0	10.166.28.0
2	10.166.28.1/32	10.166.28.1 – 10.166.28.1	10.166.28.1
3	10.166.28.2/32	10.166.28.2 – 10.166.28.2	10.166.28.2
4	10.166.28.3/32	10.166.28.3 – 10.166.28.3	10.166.28.3
5	10.166.28.4/32	10.166.28.4 – 10.166.28.4	10.166.28.4
6	10.166.28.5/32	10.166.28.5 – 10.166.28.5	10.166.28.5
7	10.166.28.6/32	10.166.28.6 – 10.166.28.6	10.166.28.6
8	10.166.28.7/32	10.166.28.7 – 10.166.28.7	10.166.28.7
9	10.166.28.8/32	10.166.28.8 – 10.166.28.8	10.166.28.8
10	10.166.28.9/32	10.166.28.9 – 10.166.28.9	10.166.28.9
11	10.166.28.10/32	10.166.28.10 – 10.166.28.10	10.166.28.10
12	10.166.28.11/32	10.166.28.11 – 10.166.28.11	10.166.28.11
13	10.166.28.12/32	10.166.28.12 – 10.166.28.12	10.166.28.12
14	10.166.28.13/32	10.166.28.13 – 10.166.28.13	10.166.28.13
15	10.166.28.14/32	10.166.28.14 – 10.166.28.14	10.166.28.14
16	10.166.28.15/32	10.166.28.15 – 10.166.28.15	10.166.28.15
17	10.166.28.16/32	10.166.28.16 – 10.166.28.16	10.166.28.16
18	10.166.28.17/32	10.166.28.17 – 10.166.28.17	10.166.28.17
19	10.166.28.18/32	10.166.28.18 – 10.166.28.18	10.166.28.18
20	10.166.28.19/32	10.166.28.19 – 10.166.28.19	10.166.28.19
21	10.166.28.20/32	10.166.28.20 – 10.166.28.20	10.166.28.20
22	10.166.28.21/32	10.166.28.21 – 10.166.28.21	10.166.28.21
23	10.166.28.22/32	10.166.28.22 – 10.166.28.22	10.166.28.22
24	10.166.28.23/32	10.166.28.23 – 10.166.28.23	10.166.28.23
25	10.166.28.24/32	10.166.28.24 – 10.166.28.24	10.166.28.24
26	10.166.28.25/32	10.166.28.25 – 10.166.28.25	10.166.28.25
27	10.166.28.26/32	10.166.28.26 – 10.166.28.26	10.166.28.26
28	10.166.28.27/32	10.166.28.27 – 10.166.28.27	10.166.28.27
29	10.166.28.28/32	10.166.28.28 – 10.166.28.28	10.166.28.28
30	10.166.28.29/32	10.166.28.29 – 10.166.28.29	10.166.28.29
31	10.166.28.30/32	10.166.28.30 – 10.166.28.30	10.166.28.30
32	10.166.28.31/32	10.166.28.31 – 10.166.28.31	10.166.28.31
33	10.166.28.32/32	10.166.28.32 – 10.166.28.32	10.166.28.32
34	10.166.28.33/32	10.166.28.33 – 10.166.28.33	10.166.28.33
35	10.166.28.34/32	10.166.28.34 – 10.166.28.34	10.166.28.34
36	10.166.28.35/32	10.166.28.35 – 10.166.28.35	10.166.28.35
37	10.166.28.36/32	10.166.28.36 – 10.166.28.36	10.166.28.36
38	10.166.28.37/32	10.166.28.37 – 10.166.28.37	10.166.28.37
39	10.166.28.38/32	10.166.28.38 – 10.166.28.38	10.166.28.38
40	10.166.28.39/32	10.166.28.39 – 10.166.28.39	10.166.28.39
41	10.166.28.40/32	10.166.28.40 – 10.166.28.40	10.166.28.40
42	10.166.28.41/32	10.166.28.41 – 10.166.28.41	10.166.28.41
43	10.166.28.42/32	10.166.28.42 – 10.166.28.42	10.166.28.42
44	10.166.28.43/32	10.166.28.43 – 10.166.28.43	10.166.28.43
45	10.166.28.44/32	10.166.28.44 – 10.166.28.44	10.166.28.44
46	10.166.28.45/32	10.166.28.45 – 10.166.28.45	10.166.28.45
47	10.166.28.46/32	10.166.28.46 – 10.166.28.46	10.166.28.46
48	10.166.28.47/32	10.166.28.47 – 10.166.28.47	10.166.28.47
49	10.166.28.48/32	10.166.28.48 – 10.166.28.48	10.166.28.48
50	10.166.28.49/32	10.166.28.49 – 10.166.28.49	10.166.28.49
51	10.166.28.50/32	10.166.28.50 – 10.166.28.50	10.166.28.50
52	10.166.28.51/32	10.166.28.51 – 10.166.28.51	10.166.28.51
53	10.166.28.52/32	10.166.28.52 – 10.166.28.52	10.166.28.52
54	10.166.28.53/32	10.166.28.53 – 10.166.28.53	10.166.28.53
55	10.166.28.54/32	10.166.28.54 – 10.166.28.54	10.166.28.54
56	10.166.28.55/32	10.166.28.55 – 10.166.28.55	10.166.28.55
57	10.166.28.56/32	10.166.28.56 – 10.166.28.56	10.166.28.56
58	10.166.28.57/32	10.166.28.57 – 10.166.28.57	10.166.28.57
59	10.166.28.58/32	10.166.28.58 – 10.166.28.58	10.166.28.58
60	10.166.28.59/32	10.166.28.59 – 10.166.28.59	10.166.28.59
61	10.166.28.60/32	10.166.28.60 – 10.166.28.60	10.166.28.60
62	10.166.28.61/32	10.166.28.61 – 10.166.28.61	10.166.28.61
63	10.166.28.62/32	10.166.28.62 – 10.166.28.62	10.166.28.62
64	10.166.28.63/32	10.166.28.63 – 10.166.28.63	10.166.28.63
65	10.166.28.64/32	10.166.28.64 – 10.166.28.64	10.166.28.64
66	10.166.28.65/32	10.166.28.65 – 10.166.28.65	10.166.28.65
67	10.166.28.66/32	10.166.28.66 – 10.166.28.66	10.166.28.66
68	10.166.28.67/32	10.166.28.67 – 10.166.28.67	10.166.28.67
69	10.166.28.68/32	10.166.28.68 – 10.166.28.68	10.166.28.68
70	10.166.28.69/32	10.166.28.69 – 10.166.28.69	10.166.28.69
71	10.166.28.70/32	10.166.28.70 – 10.166.28.70	10.166.28.70
72	10.166.28.71/32	10.166.28.71 – 10.166.28.71	10.166.28.71
73	10.166.28.72/32	10.166.28.72 – 10.166.28.72	10.166.28.72
74	10.166.28.73/32	10.166.28.73 – 10.166.28.73	10.166.28.73
75	10.166.28.74/32	10.166.28.74 – 10.166.28.74	10.166.28.74
76	10.166.28.75/32	10.166.28.75 – 10.166.28.75	10.166.28.75
77	10.166.28.76/32	10.166.28.76 – 10.166.28.76	10.166.28.76
78	10.166.28.77/32	10.166.28.77 – 10.166.28.77	10.166.28.77
79	10.166.28.78/32	10.166.28.78 – 10.166.28.78	10.166.28.78
80	10.166.28.79/32	10.166.28.79 – 10.166.28.79	10.166.28.79
81	10.166.28.80/32	10.166.28.80 – 10.166.28.80	10.166.28.80
82	10.166.28.81/32	10.166.28.81 – 10.166.28.81	10.166.28.81
83	10.166.28.82/32	10.166.28.82 – 10.166.28.82	10.166.28.82
84	10.166.28.83/32	10.166.28.83 – 10.166.28.83	10.166.28.83
85	10.166.28.84/32	10.166.28.84 – 10.166.28.84	10.166.28.84
86	10.166.28.85/32	10.166.28.85 – 10.166.28.85	10.166.28.85
87	10.166.28.86/32	10.166.28.86 – 10.166.28.86	10.166.28.86
88	10.166.28.87/32	10.166.28.87 – 10.166.28.87	10.166.28.87
89	10.166.28.88/32	10.166.28.88 – 10.166.28.88	10.166.28.88
90	10.166.28.89/32	10.166.28.89 – 10.166.28.89	10.166.28.89
91	10.166.28.90/32	10.166.28.90 – 10.166.28.90	10.166.28.90
92	10.166.28.91/32	10.166.28.91 – 10.166.28.91	10.166.28.91
93	10.166.28.92/32	10.166.28.92 – 10.166.28.92	10.166.28.92
94	10.166.28.93/32	10.166.28.93 – 10.166.28.93	10.166.28.93
95	10.166.28.94/32	10.166.28.94 – 10.166.28.94	10.166.28.94
96	10.166.28.95/32	10.166.28.95 – 10.166.28.95	10.166.28.95
97	10.166.28.96/32	10.166.28.96 – 10.166.28.96	10.166.28.96
98	10.166.28.97/32	10.166.28.97 – 10.166.28.97	10.166.28.97
99	10.166.28.98/32	10.166.28.98 – 10.166.28.98	10.166.28.98
100	10.166.28.99/32	10.166.28.99 – 10.166.28.99	10.166.28.99
101	10.166.28.100/32	10.166.28.100 – 10.166.28.100	10.166.28.100
102	10.166.28.101/32	10.166.28.101 – 10.166.28.101	10.166.28.101
103	10.166.28.102/32	10.166.28.102 – 10.166.28.102	10.166.28.102
104	10.166.28.103/32	10.166.28.103 – 10.166.28.103	10.166.28.103
105	10.166.28.104/32	10.166.28.104 – 10.166.28.104	10.166.28.104
106	10.166.28.105/32	10.166.28.105 – 10.166.28.105	10.166.28.105
107	10.166.28.106/32	10.166.28.106 – 10.166.28.106	10.166.28.106
108	10.166.28.107/32	10.166.28.107 – 10.166.28.107	10.166.28.107
109	10.166.28.108/32	10.166.28.108 – 10.166.28.108	10.166.28.108
110	10.166.28.109/32	10.166.28.109 – 10.166.28.109	10.166.28.109
111	10.166.28.110/32	10.166.28.110 – 10.166.28.110	10.166.28.110
112	10.166.28.111/32	10.166.28.111 – 10.166.28.111	10.166.28.111
113	10.166.28.112/32	10.166.28.112 – 10.166.28.112	10.166.28.112
114	10.166.28.113/32	10.166.28.113 – 10.166.28.113	10.166.28.113
115	10.166.28.114/32	10.166.28.114 – 10.166.28.114	10.166.28.114
116	10.166.28.115/32	10.166.28.115 – 10.166.28.115	10.166.28.115
117	10.166.28.116/32	10.166.28.116 – 10.166.28.116	10.166.28.116
118	10.166.28.117/32	10.166.28.117 – 10.166.28.117	10.166.28.117
119	10.166.28.118/32	10.166.28.118 – 10.166.28.118	10.166.28.118
120	10.166.28.119/32	10.166.28.119 – 10.166.28.119	10.166.28.119
121	10.166.28.120/32	10.166.28.120 – 10.166.28.120	10.166.28.120
122	10.166.28.121/32	10.166.28.121 – 10.166.28.121	10.166.28.121
123	10.166.28.122/32	10.166.28.122 – 10.166.28.122	10.166.28.122
124	10.166.28.123/32	10.166.28.123 – 10.166.28.123	10.166.28.123
125	10.166.28.124/32	10.166.28.124 – 10.166.28.124	10.166.28.124
126	10.166.28.125/32	10.166.28.125 – 10.166.28.125	10.166.28.125
127	10.166.28.126/32	10.166.28.126 – 10.166.28.126	10.166.28.126
128	10.166.28.127/32	10.166.28.127 – 10.166.28.127	10.166.28.127
129	10.166.28.128/32	10.166.28.128 – 10.166.28.128	10.166.28.128
130	10.166.28.129/32	10.166.28.129 – 10.166.28.129	10.166.28.129
131	10.166.28.130/32	10.166.28.130 – 10.166.28.130	10.166.28.130
132	10.166.28.131/32	10.166.28.131 – 10.166.28.131	10.166.28.131
133	10.166.28.132/32	10.166.28.132 – 10.166.28.132	10.166.28.132
134	10.166.28.133/32	10.166.28.133 – 10.166.28.133	10.166.28.133
135	10.166.28.134/32	10.166.28.134 – 10.166.28.134	10.166.28.134
136	10.166.28.135/32	10.166.28.135 – 10.166.28.135	10.166.28.135
137	10.166.28.136/32	10.166.28.136 – 10.166.28.136	10.166.28.136
138	10.166.28.137/32	10.166.28.137 – 10.166.28.137	10.166.28.137
139	10.166.28.138/32	10.166.28.138 – 10.166.28.138	10.166.28.138
140	10.166.28.139/32	10.166.28.139 – 10.166.28.139	10.166.28.139
141	10.166.28.140/32	10.166.28.140 – 10.166.28.140	10.166.28.140
142	10.166.28.141/32	10.166.28.141 – 10.166.28.141	10.166.28.141
143	10.166.28.142/32	10.166.28.142 – 10.166.28.142	10.166.28.142
144	10.166.28.143/32	10.166.28.143 – 10.166.28.143	10.166.28.143
145	10.166.28.144/32	10.166.28.144 – 10.166.28.144	10.166.28.144
146	10.166.28.145/32	10.166.28.145 – 10.166.28.145	10.166.28.145
147	10.166.28.146/32	10.166.28.146 – 10.166.28.146	10.166.28.146
148	10.166.28.147/32	10.166.28.147 – 10.166.28.147	10.166.28.147
149	10.166.28.148/32	10.166.28.148 – 10.166.28.148	10.166.28.148
150	10.166.28.149/32	10.166.28.149 – 10.166.28.149	10.166.28.149
151	10.166.28.150/32	10.166.28.150 – 10.166.28.150	10.166.28.150
152	10.166.28.151/32	10.166.28.151 – 10.166.28.151	10.166.28.151
153	10.166.28.152/32	10.166.28.152 – 10.166.28.152	10.166.28.152
154	10.166.28.153/32	10.166.28.153 – 10.166.28.153	10.166.28.153
155	10.166.28.154/32	10.166.28.154 – 10.166.28.154	10.166.28.154
156	10.166.28.155/32	10.166.28.155 – 10.166.28.155	10.166.28.155
157	10.166.28.156/32	10.166.28.156 – 10.166.28.156	10.166.28.156
158	10.166.28.157/32	10.166.28.157 – 10.166.28.157	10.166.28.157
159	10.166.28.158/32	10.166.28.158 – 10.166.28.158	10.166.28.158
160	10.166.28.159/32	10.166.28.159 – 10.166.28.159	10.166.28.159
161	10.166.28.160/32	10.166.28.160 – 10.166.28.160	10.166.28.160
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166	10.166.28.165/32	10.166.28.165 – 10.166.28.165	10.166.28.165
167	10.166.28.166/32	10.166.28.166 – 10.166.28.166	10.166.28.166
168	10.166.28.167/32	10.166.28.167 – 10.166.28.167	10.166.28.167
169	10.166.28.168/32	10.166.28.168 – 10.166.28.168	10.166.28.168
170	10.166.28.169/32	10.166.28.169 – 10.166.28.169	10.166.28.169
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201	10.166.28.200/32	10.166.28.200 – 10.166.28.200	10.166.28.200
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210	10.166.28.209/32	10.166.28.209 – 10.166.28.209	10.166.28.209
211	10.166.28.210/32	10.166.28.210 – 10.166.28.210	10.166.28.210
212	10.166.28.211/32	10.166.28.211 – 10.166.28.211	10.166.28.211
213	10.166.28.212/32	10.166.28.212 – 10.166.28.212	10.166.28.212
214	10.166.28.213/32	10.166.28.213 – 10.166.28.213	10.166.28.213
215	10.166.28.214/32	10.166.28.214 – 10.166.28.214	10.166.28.214
216	10.166.28.215/32	10.166.28.215 – 10.166.28.215	10.166.28.215
217	10.166.28.216/32	10.166.28.216 – 10.166.28.216	10.166.28.216
218	10.166.28.217/32	10.166.28.217 – 10.166.28.217	10.166.28.217
219	10.166.28.218/32	10.166.28.218 – 10.166.28.218	10.166.28.218
220	10.166.28.219/32	10.166.28.219 – 10.166.28.219	10.166.28.219
221	10.166.28.220/32	10.166.28.220 – 10.166.28.220	10.166.28.220
222	10.166.28.221/32	10.166.28.221 – 10.166.28.221	10.166.28.221
223	10.166.28.222/32	10.166.28.222 – 10.166.28.222	10.166.28.222
224	10.166.28.223/32	10.166.28.223 – 10.166.28.223	10.166.28.223
225	10.166.28.224/32	10.166.28.224 – 10.166.28.224	10.166.28.224
226	10.166.28.225/32	10.166.28.225 – 10.166.28.225	10.166.28.225
227	10.166.28.226/32	10.166.28.226 – 10.166.28.226	10.166.28.226
228	10.166.28.227/32	10.166.28.227 – 10.166.28.227	10.166.28.227
229	10.166.28.228/32	10.166.28.228 – 10.166.28.228	10.166.28.228
230	10.166.28.229/32	10.166.28.229 – 10.166.28.229	10.166.28.229
231	10.166.28.230/32	10.166.28.230 – 10.166.28.230	10.166.28.230
232	10.166.28.231/32	10.166.28.231 – 10.166.28.231	10.166.28.231
233	10.166.28.232/32	10.166.28.232 – 10.166.28.232	10.166.28.232
234	10.166.28.233/32	10.166.28.233 – 10.166.28.233	10.166.28.233
235	10.166.28.234/32	10.166.28.234 – 10.166.28.234	10.166.28.234
236	10.166.28.235/32	10.166.28.235 – 10.166.28.235	10.166.28.235
237	10.166.28.236/32	10.166.28.236 – 10.166.28.236	10.166.28.236
238	10.166.28.237/32	10.166.28.237 – 10.166.28.237	10.166.28.237
239	10.166.28.238/32	10.166.28.238 – 10.166.28.238	10.166.28.238
240	10.166.28.239/32	10.166.28.239 – 10.166.28.239	10.166.28.239
241	10.166.28.240/32	10.166.28.240 – 10.166.28.240	10.166.28.240
242	10.166.28.241/32	10.166.28.241 – 10.166.28.241	10.166.28.241
243	10.166.28.242/32	10.166.28.242 – 10.166.28.242	10.166.28.242
244	10.166.28.243/32	10.166.28.243 – 10.166.28.243	10.166.28.243
245	10.166.28.244/32	10.166.28.244 – 10.166.28.244	10.166.28.244
246	10.166.28.245/32	10.166.28.245 – 10.166.28.245	10.166.28.245
247	10.166.28.246/32	10.166.28.246 – 10.166.28.246	10.166.28.246
248	10.166.28.247/32	10.166.28.247 – 10.166.28.247	10.166.28.247
249	10.166.28.248/32	10.166.28.248 – 10.166.28.248	10.166.28.248
250	10.166.28.249/32	10.166.28.249 – 10.166.28.249	10.166.28.249
251	10.166.28.250/32	10.166.28.250 – 10.166.28.250	10.166.28.250
252	10.166.28.251/32	10.166.28.251 – 10.166.28.251	10.166.28.251
253	10.166.28.252/32	10.166.28.252 – 10.166.28.252	10.166.28.252
254	10.166.28.253/32	10.166.28.253 – 10.166.28.253	10.166.28.253
255	10.166.28.254/32	10.166.28.254 – 10.166.28.254	10.166.28.254
256	10.166.28.255/32	10.166.28.255 – 10.166.28.255	10.166.28.255

showing 256 of 512

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