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)10.2.40.0/23

network10.2.40.0/23

broadcast10.2.41.255

first host10.2.40.1

last host10.2.41.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.40.0/23

address00001010.00000010.00101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.00101000.00000000

broadcast00001010.00000010.00101001.11111111

green = network part, grey = host part

hex0x0a022800

decimal167913472

reverse dns0.40.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2800

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.40.0/32	10.2.40.0 – 10.2.40.0	10.2.40.0
2	10.2.40.1/32	10.2.40.1 – 10.2.40.1	10.2.40.1
3	10.2.40.2/32	10.2.40.2 – 10.2.40.2	10.2.40.2
4	10.2.40.3/32	10.2.40.3 – 10.2.40.3	10.2.40.3
5	10.2.40.4/32	10.2.40.4 – 10.2.40.4	10.2.40.4
6	10.2.40.5/32	10.2.40.5 – 10.2.40.5	10.2.40.5
7	10.2.40.6/32	10.2.40.6 – 10.2.40.6	10.2.40.6
8	10.2.40.7/32	10.2.40.7 – 10.2.40.7	10.2.40.7
9	10.2.40.8/32	10.2.40.8 – 10.2.40.8	10.2.40.8
10	10.2.40.9/32	10.2.40.9 – 10.2.40.9	10.2.40.9
11	10.2.40.10/32	10.2.40.10 – 10.2.40.10	10.2.40.10
12	10.2.40.11/32	10.2.40.11 – 10.2.40.11	10.2.40.11
13	10.2.40.12/32	10.2.40.12 – 10.2.40.12	10.2.40.12
14	10.2.40.13/32	10.2.40.13 – 10.2.40.13	10.2.40.13
15	10.2.40.14/32	10.2.40.14 – 10.2.40.14	10.2.40.14
16	10.2.40.15/32	10.2.40.15 – 10.2.40.15	10.2.40.15
17	10.2.40.16/32	10.2.40.16 – 10.2.40.16	10.2.40.16
18	10.2.40.17/32	10.2.40.17 – 10.2.40.17	10.2.40.17
19	10.2.40.18/32	10.2.40.18 – 10.2.40.18	10.2.40.18
20	10.2.40.19/32	10.2.40.19 – 10.2.40.19	10.2.40.19
21	10.2.40.20/32	10.2.40.20 – 10.2.40.20	10.2.40.20
22	10.2.40.21/32	10.2.40.21 – 10.2.40.21	10.2.40.21
23	10.2.40.22/32	10.2.40.22 – 10.2.40.22	10.2.40.22
24	10.2.40.23/32	10.2.40.23 – 10.2.40.23	10.2.40.23
25	10.2.40.24/32	10.2.40.24 – 10.2.40.24	10.2.40.24
26	10.2.40.25/32	10.2.40.25 – 10.2.40.25	10.2.40.25
27	10.2.40.26/32	10.2.40.26 – 10.2.40.26	10.2.40.26
28	10.2.40.27/32	10.2.40.27 – 10.2.40.27	10.2.40.27
29	10.2.40.28/32	10.2.40.28 – 10.2.40.28	10.2.40.28
30	10.2.40.29/32	10.2.40.29 – 10.2.40.29	10.2.40.29
31	10.2.40.30/32	10.2.40.30 – 10.2.40.30	10.2.40.30
32	10.2.40.31/32	10.2.40.31 – 10.2.40.31	10.2.40.31
33	10.2.40.32/32	10.2.40.32 – 10.2.40.32	10.2.40.32
34	10.2.40.33/32	10.2.40.33 – 10.2.40.33	10.2.40.33
35	10.2.40.34/32	10.2.40.34 – 10.2.40.34	10.2.40.34
36	10.2.40.35/32	10.2.40.35 – 10.2.40.35	10.2.40.35
37	10.2.40.36/32	10.2.40.36 – 10.2.40.36	10.2.40.36
38	10.2.40.37/32	10.2.40.37 – 10.2.40.37	10.2.40.37
39	10.2.40.38/32	10.2.40.38 – 10.2.40.38	10.2.40.38
40	10.2.40.39/32	10.2.40.39 – 10.2.40.39	10.2.40.39
41	10.2.40.40/32	10.2.40.40 – 10.2.40.40	10.2.40.40
42	10.2.40.41/32	10.2.40.41 – 10.2.40.41	10.2.40.41
43	10.2.40.42/32	10.2.40.42 – 10.2.40.42	10.2.40.42
44	10.2.40.43/32	10.2.40.43 – 10.2.40.43	10.2.40.43
45	10.2.40.44/32	10.2.40.44 – 10.2.40.44	10.2.40.44
46	10.2.40.45/32	10.2.40.45 – 10.2.40.45	10.2.40.45
47	10.2.40.46/32	10.2.40.46 – 10.2.40.46	10.2.40.46
48	10.2.40.47/32	10.2.40.47 – 10.2.40.47	10.2.40.47
49	10.2.40.48/32	10.2.40.48 – 10.2.40.48	10.2.40.48
50	10.2.40.49/32	10.2.40.49 – 10.2.40.49	10.2.40.49
51	10.2.40.50/32	10.2.40.50 – 10.2.40.50	10.2.40.50
52	10.2.40.51/32	10.2.40.51 – 10.2.40.51	10.2.40.51
53	10.2.40.52/32	10.2.40.52 – 10.2.40.52	10.2.40.52
54	10.2.40.53/32	10.2.40.53 – 10.2.40.53	10.2.40.53
55	10.2.40.54/32	10.2.40.54 – 10.2.40.54	10.2.40.54
56	10.2.40.55/32	10.2.40.55 – 10.2.40.55	10.2.40.55
57	10.2.40.56/32	10.2.40.56 – 10.2.40.56	10.2.40.56
58	10.2.40.57/32	10.2.40.57 – 10.2.40.57	10.2.40.57
59	10.2.40.58/32	10.2.40.58 – 10.2.40.58	10.2.40.58
60	10.2.40.59/32	10.2.40.59 – 10.2.40.59	10.2.40.59
61	10.2.40.60/32	10.2.40.60 – 10.2.40.60	10.2.40.60
62	10.2.40.61/32	10.2.40.61 – 10.2.40.61	10.2.40.61
63	10.2.40.62/32	10.2.40.62 – 10.2.40.62	10.2.40.62
64	10.2.40.63/32	10.2.40.63 – 10.2.40.63	10.2.40.63
65	10.2.40.64/32	10.2.40.64 – 10.2.40.64	10.2.40.64
66	10.2.40.65/32	10.2.40.65 – 10.2.40.65	10.2.40.65
67	10.2.40.66/32	10.2.40.66 – 10.2.40.66	10.2.40.66
68	10.2.40.67/32	10.2.40.67 – 10.2.40.67	10.2.40.67
69	10.2.40.68/32	10.2.40.68 – 10.2.40.68	10.2.40.68
70	10.2.40.69/32	10.2.40.69 – 10.2.40.69	10.2.40.69
71	10.2.40.70/32	10.2.40.70 – 10.2.40.70	10.2.40.70
72	10.2.40.71/32	10.2.40.71 – 10.2.40.71	10.2.40.71
73	10.2.40.72/32	10.2.40.72 – 10.2.40.72	10.2.40.72
74	10.2.40.73/32	10.2.40.73 – 10.2.40.73	10.2.40.73
75	10.2.40.74/32	10.2.40.74 – 10.2.40.74	10.2.40.74
76	10.2.40.75/32	10.2.40.75 – 10.2.40.75	10.2.40.75
77	10.2.40.76/32	10.2.40.76 – 10.2.40.76	10.2.40.76
78	10.2.40.77/32	10.2.40.77 – 10.2.40.77	10.2.40.77
79	10.2.40.78/32	10.2.40.78 – 10.2.40.78	10.2.40.78
80	10.2.40.79/32	10.2.40.79 – 10.2.40.79	10.2.40.79
81	10.2.40.80/32	10.2.40.80 – 10.2.40.80	10.2.40.80
82	10.2.40.81/32	10.2.40.81 – 10.2.40.81	10.2.40.81
83	10.2.40.82/32	10.2.40.82 – 10.2.40.82	10.2.40.82
84	10.2.40.83/32	10.2.40.83 – 10.2.40.83	10.2.40.83
85	10.2.40.84/32	10.2.40.84 – 10.2.40.84	10.2.40.84
86	10.2.40.85/32	10.2.40.85 – 10.2.40.85	10.2.40.85
87	10.2.40.86/32	10.2.40.86 – 10.2.40.86	10.2.40.86
88	10.2.40.87/32	10.2.40.87 – 10.2.40.87	10.2.40.87
89	10.2.40.88/32	10.2.40.88 – 10.2.40.88	10.2.40.88
90	10.2.40.89/32	10.2.40.89 – 10.2.40.89	10.2.40.89
91	10.2.40.90/32	10.2.40.90 – 10.2.40.90	10.2.40.90
92	10.2.40.91/32	10.2.40.91 – 10.2.40.91	10.2.40.91
93	10.2.40.92/32	10.2.40.92 – 10.2.40.92	10.2.40.92
94	10.2.40.93/32	10.2.40.93 – 10.2.40.93	10.2.40.93
95	10.2.40.94/32	10.2.40.94 – 10.2.40.94	10.2.40.94
96	10.2.40.95/32	10.2.40.95 – 10.2.40.95	10.2.40.95
97	10.2.40.96/32	10.2.40.96 – 10.2.40.96	10.2.40.96
98	10.2.40.97/32	10.2.40.97 – 10.2.40.97	10.2.40.97
99	10.2.40.98/32	10.2.40.98 – 10.2.40.98	10.2.40.98
100	10.2.40.99/32	10.2.40.99 – 10.2.40.99	10.2.40.99
101	10.2.40.100/32	10.2.40.100 – 10.2.40.100	10.2.40.100
102	10.2.40.101/32	10.2.40.101 – 10.2.40.101	10.2.40.101
103	10.2.40.102/32	10.2.40.102 – 10.2.40.102	10.2.40.102
104	10.2.40.103/32	10.2.40.103 – 10.2.40.103	10.2.40.103
105	10.2.40.104/32	10.2.40.104 – 10.2.40.104	10.2.40.104
106	10.2.40.105/32	10.2.40.105 – 10.2.40.105	10.2.40.105
107	10.2.40.106/32	10.2.40.106 – 10.2.40.106	10.2.40.106
108	10.2.40.107/32	10.2.40.107 – 10.2.40.107	10.2.40.107
109	10.2.40.108/32	10.2.40.108 – 10.2.40.108	10.2.40.108
110	10.2.40.109/32	10.2.40.109 – 10.2.40.109	10.2.40.109
111	10.2.40.110/32	10.2.40.110 – 10.2.40.110	10.2.40.110
112	10.2.40.111/32	10.2.40.111 – 10.2.40.111	10.2.40.111
113	10.2.40.112/32	10.2.40.112 – 10.2.40.112	10.2.40.112
114	10.2.40.113/32	10.2.40.113 – 10.2.40.113	10.2.40.113
115	10.2.40.114/32	10.2.40.114 – 10.2.40.114	10.2.40.114
116	10.2.40.115/32	10.2.40.115 – 10.2.40.115	10.2.40.115
117	10.2.40.116/32	10.2.40.116 – 10.2.40.116	10.2.40.116
118	10.2.40.117/32	10.2.40.117 – 10.2.40.117	10.2.40.117
119	10.2.40.118/32	10.2.40.118 – 10.2.40.118	10.2.40.118
120	10.2.40.119/32	10.2.40.119 – 10.2.40.119	10.2.40.119
121	10.2.40.120/32	10.2.40.120 – 10.2.40.120	10.2.40.120
122	10.2.40.121/32	10.2.40.121 – 10.2.40.121	10.2.40.121
123	10.2.40.122/32	10.2.40.122 – 10.2.40.122	10.2.40.122
124	10.2.40.123/32	10.2.40.123 – 10.2.40.123	10.2.40.123
125	10.2.40.124/32	10.2.40.124 – 10.2.40.124	10.2.40.124
126	10.2.40.125/32	10.2.40.125 – 10.2.40.125	10.2.40.125
127	10.2.40.126/32	10.2.40.126 – 10.2.40.126	10.2.40.126
128	10.2.40.127/32	10.2.40.127 – 10.2.40.127	10.2.40.127
129	10.2.40.128/32	10.2.40.128 – 10.2.40.128	10.2.40.128
130	10.2.40.129/32	10.2.40.129 – 10.2.40.129	10.2.40.129
131	10.2.40.130/32	10.2.40.130 – 10.2.40.130	10.2.40.130
132	10.2.40.131/32	10.2.40.131 – 10.2.40.131	10.2.40.131
133	10.2.40.132/32	10.2.40.132 – 10.2.40.132	10.2.40.132
134	10.2.40.133/32	10.2.40.133 – 10.2.40.133	10.2.40.133
135	10.2.40.134/32	10.2.40.134 – 10.2.40.134	10.2.40.134
136	10.2.40.135/32	10.2.40.135 – 10.2.40.135	10.2.40.135
137	10.2.40.136/32	10.2.40.136 – 10.2.40.136	10.2.40.136
138	10.2.40.137/32	10.2.40.137 – 10.2.40.137	10.2.40.137
139	10.2.40.138/32	10.2.40.138 – 10.2.40.138	10.2.40.138
140	10.2.40.139/32	10.2.40.139 – 10.2.40.139	10.2.40.139
141	10.2.40.140/32	10.2.40.140 – 10.2.40.140	10.2.40.140
142	10.2.40.141/32	10.2.40.141 – 10.2.40.141	10.2.40.141
143	10.2.40.142/32	10.2.40.142 – 10.2.40.142	10.2.40.142
144	10.2.40.143/32	10.2.40.143 – 10.2.40.143	10.2.40.143
145	10.2.40.144/32	10.2.40.144 – 10.2.40.144	10.2.40.144
146	10.2.40.145/32	10.2.40.145 – 10.2.40.145	10.2.40.145
147	10.2.40.146/32	10.2.40.146 – 10.2.40.146	10.2.40.146
148	10.2.40.147/32	10.2.40.147 – 10.2.40.147	10.2.40.147
149	10.2.40.148/32	10.2.40.148 – 10.2.40.148	10.2.40.148
150	10.2.40.149/32	10.2.40.149 – 10.2.40.149	10.2.40.149
151	10.2.40.150/32	10.2.40.150 – 10.2.40.150	10.2.40.150
152	10.2.40.151/32	10.2.40.151 – 10.2.40.151	10.2.40.151
153	10.2.40.152/32	10.2.40.152 – 10.2.40.152	10.2.40.152
154	10.2.40.153/32	10.2.40.153 – 10.2.40.153	10.2.40.153
155	10.2.40.154/32	10.2.40.154 – 10.2.40.154	10.2.40.154
156	10.2.40.155/32	10.2.40.155 – 10.2.40.155	10.2.40.155
157	10.2.40.156/32	10.2.40.156 – 10.2.40.156	10.2.40.156
158	10.2.40.157/32	10.2.40.157 – 10.2.40.157	10.2.40.157
159	10.2.40.158/32	10.2.40.158 – 10.2.40.158	10.2.40.158
160	10.2.40.159/32	10.2.40.159 – 10.2.40.159	10.2.40.159
161	10.2.40.160/32	10.2.40.160 – 10.2.40.160	10.2.40.160
162	10.2.40.161/32	10.2.40.161 – 10.2.40.161	10.2.40.161
163	10.2.40.162/32	10.2.40.162 – 10.2.40.162	10.2.40.162
164	10.2.40.163/32	10.2.40.163 – 10.2.40.163	10.2.40.163
165	10.2.40.164/32	10.2.40.164 – 10.2.40.164	10.2.40.164
166	10.2.40.165/32	10.2.40.165 – 10.2.40.165	10.2.40.165
167	10.2.40.166/32	10.2.40.166 – 10.2.40.166	10.2.40.166
168	10.2.40.167/32	10.2.40.167 – 10.2.40.167	10.2.40.167
169	10.2.40.168/32	10.2.40.168 – 10.2.40.168	10.2.40.168
170	10.2.40.169/32	10.2.40.169 – 10.2.40.169	10.2.40.169
171	10.2.40.170/32	10.2.40.170 – 10.2.40.170	10.2.40.170
172	10.2.40.171/32	10.2.40.171 – 10.2.40.171	10.2.40.171
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210	10.2.40.209/32	10.2.40.209 – 10.2.40.209	10.2.40.209
211	10.2.40.210/32	10.2.40.210 – 10.2.40.210	10.2.40.210
212	10.2.40.211/32	10.2.40.211 – 10.2.40.211	10.2.40.211
213	10.2.40.212/32	10.2.40.212 – 10.2.40.212	10.2.40.212
214	10.2.40.213/32	10.2.40.213 – 10.2.40.213	10.2.40.213
215	10.2.40.214/32	10.2.40.214 – 10.2.40.214	10.2.40.214
216	10.2.40.215/32	10.2.40.215 – 10.2.40.215	10.2.40.215
217	10.2.40.216/32	10.2.40.216 – 10.2.40.216	10.2.40.216
218	10.2.40.217/32	10.2.40.217 – 10.2.40.217	10.2.40.217
219	10.2.40.218/32	10.2.40.218 – 10.2.40.218	10.2.40.218
220	10.2.40.219/32	10.2.40.219 – 10.2.40.219	10.2.40.219
221	10.2.40.220/32	10.2.40.220 – 10.2.40.220	10.2.40.220
222	10.2.40.221/32	10.2.40.221 – 10.2.40.221	10.2.40.221
223	10.2.40.222/32	10.2.40.222 – 10.2.40.222	10.2.40.222
224	10.2.40.223/32	10.2.40.223 – 10.2.40.223	10.2.40.223
225	10.2.40.224/32	10.2.40.224 – 10.2.40.224	10.2.40.224
226	10.2.40.225/32	10.2.40.225 – 10.2.40.225	10.2.40.225
227	10.2.40.226/32	10.2.40.226 – 10.2.40.226	10.2.40.226
228	10.2.40.227/32	10.2.40.227 – 10.2.40.227	10.2.40.227
229	10.2.40.228/32	10.2.40.228 – 10.2.40.228	10.2.40.228
230	10.2.40.229/32	10.2.40.229 – 10.2.40.229	10.2.40.229
231	10.2.40.230/32	10.2.40.230 – 10.2.40.230	10.2.40.230
232	10.2.40.231/32	10.2.40.231 – 10.2.40.231	10.2.40.231
233	10.2.40.232/32	10.2.40.232 – 10.2.40.232	10.2.40.232
234	10.2.40.233/32	10.2.40.233 – 10.2.40.233	10.2.40.233
235	10.2.40.234/32	10.2.40.234 – 10.2.40.234	10.2.40.234
236	10.2.40.235/32	10.2.40.235 – 10.2.40.235	10.2.40.235
237	10.2.40.236/32	10.2.40.236 – 10.2.40.236	10.2.40.236
238	10.2.40.237/32	10.2.40.237 – 10.2.40.237	10.2.40.237
239	10.2.40.238/32	10.2.40.238 – 10.2.40.238	10.2.40.238
240	10.2.40.239/32	10.2.40.239 – 10.2.40.239	10.2.40.239
241	10.2.40.240/32	10.2.40.240 – 10.2.40.240	10.2.40.240
242	10.2.40.241/32	10.2.40.241 – 10.2.40.241	10.2.40.241
243	10.2.40.242/32	10.2.40.242 – 10.2.40.242	10.2.40.242
244	10.2.40.243/32	10.2.40.243 – 10.2.40.243	10.2.40.243
245	10.2.40.244/32	10.2.40.244 – 10.2.40.244	10.2.40.244
246	10.2.40.245/32	10.2.40.245 – 10.2.40.245	10.2.40.245
247	10.2.40.246/32	10.2.40.246 – 10.2.40.246	10.2.40.246
248	10.2.40.247/32	10.2.40.247 – 10.2.40.247	10.2.40.247
249	10.2.40.248/32	10.2.40.248 – 10.2.40.248	10.2.40.248
250	10.2.40.249/32	10.2.40.249 – 10.2.40.249	10.2.40.249
251	10.2.40.250/32	10.2.40.250 – 10.2.40.250	10.2.40.250
252	10.2.40.251/32	10.2.40.251 – 10.2.40.251	10.2.40.251
253	10.2.40.252/32	10.2.40.252 – 10.2.40.252	10.2.40.252
254	10.2.40.253/32	10.2.40.253 – 10.2.40.253	10.2.40.253
255	10.2.40.254/32	10.2.40.254 – 10.2.40.254	10.2.40.254
256	10.2.40.255/32	10.2.40.255 – 10.2.40.255	10.2.40.255

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 →