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)10.2.70.0/23

network10.2.70.0/23

broadcast10.2.71.255

first host10.2.70.1

last host10.2.71.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.70.0/23

address00001010.00000010.01000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01000110.00000000

broadcast00001010.00000010.01000111.11111111

green = network part, grey = host part

hex0x0a024600

decimal167921152

reverse dns0.70.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4600

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.70.0/32	10.2.70.0 – 10.2.70.0	10.2.70.0
2	10.2.70.1/32	10.2.70.1 – 10.2.70.1	10.2.70.1
3	10.2.70.2/32	10.2.70.2 – 10.2.70.2	10.2.70.2
4	10.2.70.3/32	10.2.70.3 – 10.2.70.3	10.2.70.3
5	10.2.70.4/32	10.2.70.4 – 10.2.70.4	10.2.70.4
6	10.2.70.5/32	10.2.70.5 – 10.2.70.5	10.2.70.5
7	10.2.70.6/32	10.2.70.6 – 10.2.70.6	10.2.70.6
8	10.2.70.7/32	10.2.70.7 – 10.2.70.7	10.2.70.7
9	10.2.70.8/32	10.2.70.8 – 10.2.70.8	10.2.70.8
10	10.2.70.9/32	10.2.70.9 – 10.2.70.9	10.2.70.9
11	10.2.70.10/32	10.2.70.10 – 10.2.70.10	10.2.70.10
12	10.2.70.11/32	10.2.70.11 – 10.2.70.11	10.2.70.11
13	10.2.70.12/32	10.2.70.12 – 10.2.70.12	10.2.70.12
14	10.2.70.13/32	10.2.70.13 – 10.2.70.13	10.2.70.13
15	10.2.70.14/32	10.2.70.14 – 10.2.70.14	10.2.70.14
16	10.2.70.15/32	10.2.70.15 – 10.2.70.15	10.2.70.15
17	10.2.70.16/32	10.2.70.16 – 10.2.70.16	10.2.70.16
18	10.2.70.17/32	10.2.70.17 – 10.2.70.17	10.2.70.17
19	10.2.70.18/32	10.2.70.18 – 10.2.70.18	10.2.70.18
20	10.2.70.19/32	10.2.70.19 – 10.2.70.19	10.2.70.19
21	10.2.70.20/32	10.2.70.20 – 10.2.70.20	10.2.70.20
22	10.2.70.21/32	10.2.70.21 – 10.2.70.21	10.2.70.21
23	10.2.70.22/32	10.2.70.22 – 10.2.70.22	10.2.70.22
24	10.2.70.23/32	10.2.70.23 – 10.2.70.23	10.2.70.23
25	10.2.70.24/32	10.2.70.24 – 10.2.70.24	10.2.70.24
26	10.2.70.25/32	10.2.70.25 – 10.2.70.25	10.2.70.25
27	10.2.70.26/32	10.2.70.26 – 10.2.70.26	10.2.70.26
28	10.2.70.27/32	10.2.70.27 – 10.2.70.27	10.2.70.27
29	10.2.70.28/32	10.2.70.28 – 10.2.70.28	10.2.70.28
30	10.2.70.29/32	10.2.70.29 – 10.2.70.29	10.2.70.29
31	10.2.70.30/32	10.2.70.30 – 10.2.70.30	10.2.70.30
32	10.2.70.31/32	10.2.70.31 – 10.2.70.31	10.2.70.31
33	10.2.70.32/32	10.2.70.32 – 10.2.70.32	10.2.70.32
34	10.2.70.33/32	10.2.70.33 – 10.2.70.33	10.2.70.33
35	10.2.70.34/32	10.2.70.34 – 10.2.70.34	10.2.70.34
36	10.2.70.35/32	10.2.70.35 – 10.2.70.35	10.2.70.35
37	10.2.70.36/32	10.2.70.36 – 10.2.70.36	10.2.70.36
38	10.2.70.37/32	10.2.70.37 – 10.2.70.37	10.2.70.37
39	10.2.70.38/32	10.2.70.38 – 10.2.70.38	10.2.70.38
40	10.2.70.39/32	10.2.70.39 – 10.2.70.39	10.2.70.39
41	10.2.70.40/32	10.2.70.40 – 10.2.70.40	10.2.70.40
42	10.2.70.41/32	10.2.70.41 – 10.2.70.41	10.2.70.41
43	10.2.70.42/32	10.2.70.42 – 10.2.70.42	10.2.70.42
44	10.2.70.43/32	10.2.70.43 – 10.2.70.43	10.2.70.43
45	10.2.70.44/32	10.2.70.44 – 10.2.70.44	10.2.70.44
46	10.2.70.45/32	10.2.70.45 – 10.2.70.45	10.2.70.45
47	10.2.70.46/32	10.2.70.46 – 10.2.70.46	10.2.70.46
48	10.2.70.47/32	10.2.70.47 – 10.2.70.47	10.2.70.47
49	10.2.70.48/32	10.2.70.48 – 10.2.70.48	10.2.70.48
50	10.2.70.49/32	10.2.70.49 – 10.2.70.49	10.2.70.49
51	10.2.70.50/32	10.2.70.50 – 10.2.70.50	10.2.70.50
52	10.2.70.51/32	10.2.70.51 – 10.2.70.51	10.2.70.51
53	10.2.70.52/32	10.2.70.52 – 10.2.70.52	10.2.70.52
54	10.2.70.53/32	10.2.70.53 – 10.2.70.53	10.2.70.53
55	10.2.70.54/32	10.2.70.54 – 10.2.70.54	10.2.70.54
56	10.2.70.55/32	10.2.70.55 – 10.2.70.55	10.2.70.55
57	10.2.70.56/32	10.2.70.56 – 10.2.70.56	10.2.70.56
58	10.2.70.57/32	10.2.70.57 – 10.2.70.57	10.2.70.57
59	10.2.70.58/32	10.2.70.58 – 10.2.70.58	10.2.70.58
60	10.2.70.59/32	10.2.70.59 – 10.2.70.59	10.2.70.59
61	10.2.70.60/32	10.2.70.60 – 10.2.70.60	10.2.70.60
62	10.2.70.61/32	10.2.70.61 – 10.2.70.61	10.2.70.61
63	10.2.70.62/32	10.2.70.62 – 10.2.70.62	10.2.70.62
64	10.2.70.63/32	10.2.70.63 – 10.2.70.63	10.2.70.63
65	10.2.70.64/32	10.2.70.64 – 10.2.70.64	10.2.70.64
66	10.2.70.65/32	10.2.70.65 – 10.2.70.65	10.2.70.65
67	10.2.70.66/32	10.2.70.66 – 10.2.70.66	10.2.70.66
68	10.2.70.67/32	10.2.70.67 – 10.2.70.67	10.2.70.67
69	10.2.70.68/32	10.2.70.68 – 10.2.70.68	10.2.70.68
70	10.2.70.69/32	10.2.70.69 – 10.2.70.69	10.2.70.69
71	10.2.70.70/32	10.2.70.70 – 10.2.70.70	10.2.70.70
72	10.2.70.71/32	10.2.70.71 – 10.2.70.71	10.2.70.71
73	10.2.70.72/32	10.2.70.72 – 10.2.70.72	10.2.70.72
74	10.2.70.73/32	10.2.70.73 – 10.2.70.73	10.2.70.73
75	10.2.70.74/32	10.2.70.74 – 10.2.70.74	10.2.70.74
76	10.2.70.75/32	10.2.70.75 – 10.2.70.75	10.2.70.75
77	10.2.70.76/32	10.2.70.76 – 10.2.70.76	10.2.70.76
78	10.2.70.77/32	10.2.70.77 – 10.2.70.77	10.2.70.77
79	10.2.70.78/32	10.2.70.78 – 10.2.70.78	10.2.70.78
80	10.2.70.79/32	10.2.70.79 – 10.2.70.79	10.2.70.79
81	10.2.70.80/32	10.2.70.80 – 10.2.70.80	10.2.70.80
82	10.2.70.81/32	10.2.70.81 – 10.2.70.81	10.2.70.81
83	10.2.70.82/32	10.2.70.82 – 10.2.70.82	10.2.70.82
84	10.2.70.83/32	10.2.70.83 – 10.2.70.83	10.2.70.83
85	10.2.70.84/32	10.2.70.84 – 10.2.70.84	10.2.70.84
86	10.2.70.85/32	10.2.70.85 – 10.2.70.85	10.2.70.85
87	10.2.70.86/32	10.2.70.86 – 10.2.70.86	10.2.70.86
88	10.2.70.87/32	10.2.70.87 – 10.2.70.87	10.2.70.87
89	10.2.70.88/32	10.2.70.88 – 10.2.70.88	10.2.70.88
90	10.2.70.89/32	10.2.70.89 – 10.2.70.89	10.2.70.89
91	10.2.70.90/32	10.2.70.90 – 10.2.70.90	10.2.70.90
92	10.2.70.91/32	10.2.70.91 – 10.2.70.91	10.2.70.91
93	10.2.70.92/32	10.2.70.92 – 10.2.70.92	10.2.70.92
94	10.2.70.93/32	10.2.70.93 – 10.2.70.93	10.2.70.93
95	10.2.70.94/32	10.2.70.94 – 10.2.70.94	10.2.70.94
96	10.2.70.95/32	10.2.70.95 – 10.2.70.95	10.2.70.95
97	10.2.70.96/32	10.2.70.96 – 10.2.70.96	10.2.70.96
98	10.2.70.97/32	10.2.70.97 – 10.2.70.97	10.2.70.97
99	10.2.70.98/32	10.2.70.98 – 10.2.70.98	10.2.70.98
100	10.2.70.99/32	10.2.70.99 – 10.2.70.99	10.2.70.99
101	10.2.70.100/32	10.2.70.100 – 10.2.70.100	10.2.70.100
102	10.2.70.101/32	10.2.70.101 – 10.2.70.101	10.2.70.101
103	10.2.70.102/32	10.2.70.102 – 10.2.70.102	10.2.70.102
104	10.2.70.103/32	10.2.70.103 – 10.2.70.103	10.2.70.103
105	10.2.70.104/32	10.2.70.104 – 10.2.70.104	10.2.70.104
106	10.2.70.105/32	10.2.70.105 – 10.2.70.105	10.2.70.105
107	10.2.70.106/32	10.2.70.106 – 10.2.70.106	10.2.70.106
108	10.2.70.107/32	10.2.70.107 – 10.2.70.107	10.2.70.107
109	10.2.70.108/32	10.2.70.108 – 10.2.70.108	10.2.70.108
110	10.2.70.109/32	10.2.70.109 – 10.2.70.109	10.2.70.109
111	10.2.70.110/32	10.2.70.110 – 10.2.70.110	10.2.70.110
112	10.2.70.111/32	10.2.70.111 – 10.2.70.111	10.2.70.111
113	10.2.70.112/32	10.2.70.112 – 10.2.70.112	10.2.70.112
114	10.2.70.113/32	10.2.70.113 – 10.2.70.113	10.2.70.113
115	10.2.70.114/32	10.2.70.114 – 10.2.70.114	10.2.70.114
116	10.2.70.115/32	10.2.70.115 – 10.2.70.115	10.2.70.115
117	10.2.70.116/32	10.2.70.116 – 10.2.70.116	10.2.70.116
118	10.2.70.117/32	10.2.70.117 – 10.2.70.117	10.2.70.117
119	10.2.70.118/32	10.2.70.118 – 10.2.70.118	10.2.70.118
120	10.2.70.119/32	10.2.70.119 – 10.2.70.119	10.2.70.119
121	10.2.70.120/32	10.2.70.120 – 10.2.70.120	10.2.70.120
122	10.2.70.121/32	10.2.70.121 – 10.2.70.121	10.2.70.121
123	10.2.70.122/32	10.2.70.122 – 10.2.70.122	10.2.70.122
124	10.2.70.123/32	10.2.70.123 – 10.2.70.123	10.2.70.123
125	10.2.70.124/32	10.2.70.124 – 10.2.70.124	10.2.70.124
126	10.2.70.125/32	10.2.70.125 – 10.2.70.125	10.2.70.125
127	10.2.70.126/32	10.2.70.126 – 10.2.70.126	10.2.70.126
128	10.2.70.127/32	10.2.70.127 – 10.2.70.127	10.2.70.127
129	10.2.70.128/32	10.2.70.128 – 10.2.70.128	10.2.70.128
130	10.2.70.129/32	10.2.70.129 – 10.2.70.129	10.2.70.129
131	10.2.70.130/32	10.2.70.130 – 10.2.70.130	10.2.70.130
132	10.2.70.131/32	10.2.70.131 – 10.2.70.131	10.2.70.131
133	10.2.70.132/32	10.2.70.132 – 10.2.70.132	10.2.70.132
134	10.2.70.133/32	10.2.70.133 – 10.2.70.133	10.2.70.133
135	10.2.70.134/32	10.2.70.134 – 10.2.70.134	10.2.70.134
136	10.2.70.135/32	10.2.70.135 – 10.2.70.135	10.2.70.135
137	10.2.70.136/32	10.2.70.136 – 10.2.70.136	10.2.70.136
138	10.2.70.137/32	10.2.70.137 – 10.2.70.137	10.2.70.137
139	10.2.70.138/32	10.2.70.138 – 10.2.70.138	10.2.70.138
140	10.2.70.139/32	10.2.70.139 – 10.2.70.139	10.2.70.139
141	10.2.70.140/32	10.2.70.140 – 10.2.70.140	10.2.70.140
142	10.2.70.141/32	10.2.70.141 – 10.2.70.141	10.2.70.141
143	10.2.70.142/32	10.2.70.142 – 10.2.70.142	10.2.70.142
144	10.2.70.143/32	10.2.70.143 – 10.2.70.143	10.2.70.143
145	10.2.70.144/32	10.2.70.144 – 10.2.70.144	10.2.70.144
146	10.2.70.145/32	10.2.70.145 – 10.2.70.145	10.2.70.145
147	10.2.70.146/32	10.2.70.146 – 10.2.70.146	10.2.70.146
148	10.2.70.147/32	10.2.70.147 – 10.2.70.147	10.2.70.147
149	10.2.70.148/32	10.2.70.148 – 10.2.70.148	10.2.70.148
150	10.2.70.149/32	10.2.70.149 – 10.2.70.149	10.2.70.149
151	10.2.70.150/32	10.2.70.150 – 10.2.70.150	10.2.70.150
152	10.2.70.151/32	10.2.70.151 – 10.2.70.151	10.2.70.151
153	10.2.70.152/32	10.2.70.152 – 10.2.70.152	10.2.70.152
154	10.2.70.153/32	10.2.70.153 – 10.2.70.153	10.2.70.153
155	10.2.70.154/32	10.2.70.154 – 10.2.70.154	10.2.70.154
156	10.2.70.155/32	10.2.70.155 – 10.2.70.155	10.2.70.155
157	10.2.70.156/32	10.2.70.156 – 10.2.70.156	10.2.70.156
158	10.2.70.157/32	10.2.70.157 – 10.2.70.157	10.2.70.157
159	10.2.70.158/32	10.2.70.158 – 10.2.70.158	10.2.70.158
160	10.2.70.159/32	10.2.70.159 – 10.2.70.159	10.2.70.159
161	10.2.70.160/32	10.2.70.160 – 10.2.70.160	10.2.70.160
162	10.2.70.161/32	10.2.70.161 – 10.2.70.161	10.2.70.161
163	10.2.70.162/32	10.2.70.162 – 10.2.70.162	10.2.70.162
164	10.2.70.163/32	10.2.70.163 – 10.2.70.163	10.2.70.163
165	10.2.70.164/32	10.2.70.164 – 10.2.70.164	10.2.70.164
166	10.2.70.165/32	10.2.70.165 – 10.2.70.165	10.2.70.165
167	10.2.70.166/32	10.2.70.166 – 10.2.70.166	10.2.70.166
168	10.2.70.167/32	10.2.70.167 – 10.2.70.167	10.2.70.167
169	10.2.70.168/32	10.2.70.168 – 10.2.70.168	10.2.70.168
170	10.2.70.169/32	10.2.70.169 – 10.2.70.169	10.2.70.169
171	10.2.70.170/32	10.2.70.170 – 10.2.70.170	10.2.70.170
172	10.2.70.171/32	10.2.70.171 – 10.2.70.171	10.2.70.171
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177	10.2.70.176/32	10.2.70.176 – 10.2.70.176	10.2.70.176
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180	10.2.70.179/32	10.2.70.179 – 10.2.70.179	10.2.70.179
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207	10.2.70.206/32	10.2.70.206 – 10.2.70.206	10.2.70.206
208	10.2.70.207/32	10.2.70.207 – 10.2.70.207	10.2.70.207
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210	10.2.70.209/32	10.2.70.209 – 10.2.70.209	10.2.70.209
211	10.2.70.210/32	10.2.70.210 – 10.2.70.210	10.2.70.210
212	10.2.70.211/32	10.2.70.211 – 10.2.70.211	10.2.70.211
213	10.2.70.212/32	10.2.70.212 – 10.2.70.212	10.2.70.212
214	10.2.70.213/32	10.2.70.213 – 10.2.70.213	10.2.70.213
215	10.2.70.214/32	10.2.70.214 – 10.2.70.214	10.2.70.214
216	10.2.70.215/32	10.2.70.215 – 10.2.70.215	10.2.70.215
217	10.2.70.216/32	10.2.70.216 – 10.2.70.216	10.2.70.216
218	10.2.70.217/32	10.2.70.217 – 10.2.70.217	10.2.70.217
219	10.2.70.218/32	10.2.70.218 – 10.2.70.218	10.2.70.218
220	10.2.70.219/32	10.2.70.219 – 10.2.70.219	10.2.70.219
221	10.2.70.220/32	10.2.70.220 – 10.2.70.220	10.2.70.220
222	10.2.70.221/32	10.2.70.221 – 10.2.70.221	10.2.70.221
223	10.2.70.222/32	10.2.70.222 – 10.2.70.222	10.2.70.222
224	10.2.70.223/32	10.2.70.223 – 10.2.70.223	10.2.70.223
225	10.2.70.224/32	10.2.70.224 – 10.2.70.224	10.2.70.224
226	10.2.70.225/32	10.2.70.225 – 10.2.70.225	10.2.70.225
227	10.2.70.226/32	10.2.70.226 – 10.2.70.226	10.2.70.226
228	10.2.70.227/32	10.2.70.227 – 10.2.70.227	10.2.70.227
229	10.2.70.228/32	10.2.70.228 – 10.2.70.228	10.2.70.228
230	10.2.70.229/32	10.2.70.229 – 10.2.70.229	10.2.70.229
231	10.2.70.230/32	10.2.70.230 – 10.2.70.230	10.2.70.230
232	10.2.70.231/32	10.2.70.231 – 10.2.70.231	10.2.70.231
233	10.2.70.232/32	10.2.70.232 – 10.2.70.232	10.2.70.232
234	10.2.70.233/32	10.2.70.233 – 10.2.70.233	10.2.70.233
235	10.2.70.234/32	10.2.70.234 – 10.2.70.234	10.2.70.234
236	10.2.70.235/32	10.2.70.235 – 10.2.70.235	10.2.70.235
237	10.2.70.236/32	10.2.70.236 – 10.2.70.236	10.2.70.236
238	10.2.70.237/32	10.2.70.237 – 10.2.70.237	10.2.70.237
239	10.2.70.238/32	10.2.70.238 – 10.2.70.238	10.2.70.238
240	10.2.70.239/32	10.2.70.239 – 10.2.70.239	10.2.70.239
241	10.2.70.240/32	10.2.70.240 – 10.2.70.240	10.2.70.240
242	10.2.70.241/32	10.2.70.241 – 10.2.70.241	10.2.70.241
243	10.2.70.242/32	10.2.70.242 – 10.2.70.242	10.2.70.242
244	10.2.70.243/32	10.2.70.243 – 10.2.70.243	10.2.70.243
245	10.2.70.244/32	10.2.70.244 – 10.2.70.244	10.2.70.244
246	10.2.70.245/32	10.2.70.245 – 10.2.70.245	10.2.70.245
247	10.2.70.246/32	10.2.70.246 – 10.2.70.246	10.2.70.246
248	10.2.70.247/32	10.2.70.247 – 10.2.70.247	10.2.70.247
249	10.2.70.248/32	10.2.70.248 – 10.2.70.248	10.2.70.248
250	10.2.70.249/32	10.2.70.249 – 10.2.70.249	10.2.70.249
251	10.2.70.250/32	10.2.70.250 – 10.2.70.250	10.2.70.250
252	10.2.70.251/32	10.2.70.251 – 10.2.70.251	10.2.70.251
253	10.2.70.252/32	10.2.70.252 – 10.2.70.252	10.2.70.252
254	10.2.70.253/32	10.2.70.253 – 10.2.70.253	10.2.70.253
255	10.2.70.254/32	10.2.70.254 – 10.2.70.254	10.2.70.254
256	10.2.70.255/32	10.2.70.255 – 10.2.70.255	10.2.70.255

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 →