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)10.45.71.0/24

network10.45.71.0/24

broadcast10.45.71.255

first host10.45.71.1

last host10.45.71.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.45.71.0/24

address00001010.00101101.01000111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00101101.01000111.00000000

broadcast00001010.00101101.01000111.11111111

green = network part, grey = host part

hex0x0a2d4700

decimal170739456

reverse dns0.71.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:4700

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.45.71.0/32	10.45.71.0 – 10.45.71.0	10.45.71.0
2	10.45.71.1/32	10.45.71.1 – 10.45.71.1	10.45.71.1
3	10.45.71.2/32	10.45.71.2 – 10.45.71.2	10.45.71.2
4	10.45.71.3/32	10.45.71.3 – 10.45.71.3	10.45.71.3
5	10.45.71.4/32	10.45.71.4 – 10.45.71.4	10.45.71.4
6	10.45.71.5/32	10.45.71.5 – 10.45.71.5	10.45.71.5
7	10.45.71.6/32	10.45.71.6 – 10.45.71.6	10.45.71.6
8	10.45.71.7/32	10.45.71.7 – 10.45.71.7	10.45.71.7
9	10.45.71.8/32	10.45.71.8 – 10.45.71.8	10.45.71.8
10	10.45.71.9/32	10.45.71.9 – 10.45.71.9	10.45.71.9
11	10.45.71.10/32	10.45.71.10 – 10.45.71.10	10.45.71.10
12	10.45.71.11/32	10.45.71.11 – 10.45.71.11	10.45.71.11
13	10.45.71.12/32	10.45.71.12 – 10.45.71.12	10.45.71.12
14	10.45.71.13/32	10.45.71.13 – 10.45.71.13	10.45.71.13
15	10.45.71.14/32	10.45.71.14 – 10.45.71.14	10.45.71.14
16	10.45.71.15/32	10.45.71.15 – 10.45.71.15	10.45.71.15
17	10.45.71.16/32	10.45.71.16 – 10.45.71.16	10.45.71.16
18	10.45.71.17/32	10.45.71.17 – 10.45.71.17	10.45.71.17
19	10.45.71.18/32	10.45.71.18 – 10.45.71.18	10.45.71.18
20	10.45.71.19/32	10.45.71.19 – 10.45.71.19	10.45.71.19
21	10.45.71.20/32	10.45.71.20 – 10.45.71.20	10.45.71.20
22	10.45.71.21/32	10.45.71.21 – 10.45.71.21	10.45.71.21
23	10.45.71.22/32	10.45.71.22 – 10.45.71.22	10.45.71.22
24	10.45.71.23/32	10.45.71.23 – 10.45.71.23	10.45.71.23
25	10.45.71.24/32	10.45.71.24 – 10.45.71.24	10.45.71.24
26	10.45.71.25/32	10.45.71.25 – 10.45.71.25	10.45.71.25
27	10.45.71.26/32	10.45.71.26 – 10.45.71.26	10.45.71.26
28	10.45.71.27/32	10.45.71.27 – 10.45.71.27	10.45.71.27
29	10.45.71.28/32	10.45.71.28 – 10.45.71.28	10.45.71.28
30	10.45.71.29/32	10.45.71.29 – 10.45.71.29	10.45.71.29
31	10.45.71.30/32	10.45.71.30 – 10.45.71.30	10.45.71.30
32	10.45.71.31/32	10.45.71.31 – 10.45.71.31	10.45.71.31
33	10.45.71.32/32	10.45.71.32 – 10.45.71.32	10.45.71.32
34	10.45.71.33/32	10.45.71.33 – 10.45.71.33	10.45.71.33
35	10.45.71.34/32	10.45.71.34 – 10.45.71.34	10.45.71.34
36	10.45.71.35/32	10.45.71.35 – 10.45.71.35	10.45.71.35
37	10.45.71.36/32	10.45.71.36 – 10.45.71.36	10.45.71.36
38	10.45.71.37/32	10.45.71.37 – 10.45.71.37	10.45.71.37
39	10.45.71.38/32	10.45.71.38 – 10.45.71.38	10.45.71.38
40	10.45.71.39/32	10.45.71.39 – 10.45.71.39	10.45.71.39
41	10.45.71.40/32	10.45.71.40 – 10.45.71.40	10.45.71.40
42	10.45.71.41/32	10.45.71.41 – 10.45.71.41	10.45.71.41
43	10.45.71.42/32	10.45.71.42 – 10.45.71.42	10.45.71.42
44	10.45.71.43/32	10.45.71.43 – 10.45.71.43	10.45.71.43
45	10.45.71.44/32	10.45.71.44 – 10.45.71.44	10.45.71.44
46	10.45.71.45/32	10.45.71.45 – 10.45.71.45	10.45.71.45
47	10.45.71.46/32	10.45.71.46 – 10.45.71.46	10.45.71.46
48	10.45.71.47/32	10.45.71.47 – 10.45.71.47	10.45.71.47
49	10.45.71.48/32	10.45.71.48 – 10.45.71.48	10.45.71.48
50	10.45.71.49/32	10.45.71.49 – 10.45.71.49	10.45.71.49
51	10.45.71.50/32	10.45.71.50 – 10.45.71.50	10.45.71.50
52	10.45.71.51/32	10.45.71.51 – 10.45.71.51	10.45.71.51
53	10.45.71.52/32	10.45.71.52 – 10.45.71.52	10.45.71.52
54	10.45.71.53/32	10.45.71.53 – 10.45.71.53	10.45.71.53
55	10.45.71.54/32	10.45.71.54 – 10.45.71.54	10.45.71.54
56	10.45.71.55/32	10.45.71.55 – 10.45.71.55	10.45.71.55
57	10.45.71.56/32	10.45.71.56 – 10.45.71.56	10.45.71.56
58	10.45.71.57/32	10.45.71.57 – 10.45.71.57	10.45.71.57
59	10.45.71.58/32	10.45.71.58 – 10.45.71.58	10.45.71.58
60	10.45.71.59/32	10.45.71.59 – 10.45.71.59	10.45.71.59
61	10.45.71.60/32	10.45.71.60 – 10.45.71.60	10.45.71.60
62	10.45.71.61/32	10.45.71.61 – 10.45.71.61	10.45.71.61
63	10.45.71.62/32	10.45.71.62 – 10.45.71.62	10.45.71.62
64	10.45.71.63/32	10.45.71.63 – 10.45.71.63	10.45.71.63
65	10.45.71.64/32	10.45.71.64 – 10.45.71.64	10.45.71.64
66	10.45.71.65/32	10.45.71.65 – 10.45.71.65	10.45.71.65
67	10.45.71.66/32	10.45.71.66 – 10.45.71.66	10.45.71.66
68	10.45.71.67/32	10.45.71.67 – 10.45.71.67	10.45.71.67
69	10.45.71.68/32	10.45.71.68 – 10.45.71.68	10.45.71.68
70	10.45.71.69/32	10.45.71.69 – 10.45.71.69	10.45.71.69
71	10.45.71.70/32	10.45.71.70 – 10.45.71.70	10.45.71.70
72	10.45.71.71/32	10.45.71.71 – 10.45.71.71	10.45.71.71
73	10.45.71.72/32	10.45.71.72 – 10.45.71.72	10.45.71.72
74	10.45.71.73/32	10.45.71.73 – 10.45.71.73	10.45.71.73
75	10.45.71.74/32	10.45.71.74 – 10.45.71.74	10.45.71.74
76	10.45.71.75/32	10.45.71.75 – 10.45.71.75	10.45.71.75
77	10.45.71.76/32	10.45.71.76 – 10.45.71.76	10.45.71.76
78	10.45.71.77/32	10.45.71.77 – 10.45.71.77	10.45.71.77
79	10.45.71.78/32	10.45.71.78 – 10.45.71.78	10.45.71.78
80	10.45.71.79/32	10.45.71.79 – 10.45.71.79	10.45.71.79
81	10.45.71.80/32	10.45.71.80 – 10.45.71.80	10.45.71.80
82	10.45.71.81/32	10.45.71.81 – 10.45.71.81	10.45.71.81
83	10.45.71.82/32	10.45.71.82 – 10.45.71.82	10.45.71.82
84	10.45.71.83/32	10.45.71.83 – 10.45.71.83	10.45.71.83
85	10.45.71.84/32	10.45.71.84 – 10.45.71.84	10.45.71.84
86	10.45.71.85/32	10.45.71.85 – 10.45.71.85	10.45.71.85
87	10.45.71.86/32	10.45.71.86 – 10.45.71.86	10.45.71.86
88	10.45.71.87/32	10.45.71.87 – 10.45.71.87	10.45.71.87
89	10.45.71.88/32	10.45.71.88 – 10.45.71.88	10.45.71.88
90	10.45.71.89/32	10.45.71.89 – 10.45.71.89	10.45.71.89
91	10.45.71.90/32	10.45.71.90 – 10.45.71.90	10.45.71.90
92	10.45.71.91/32	10.45.71.91 – 10.45.71.91	10.45.71.91
93	10.45.71.92/32	10.45.71.92 – 10.45.71.92	10.45.71.92
94	10.45.71.93/32	10.45.71.93 – 10.45.71.93	10.45.71.93
95	10.45.71.94/32	10.45.71.94 – 10.45.71.94	10.45.71.94
96	10.45.71.95/32	10.45.71.95 – 10.45.71.95	10.45.71.95
97	10.45.71.96/32	10.45.71.96 – 10.45.71.96	10.45.71.96
98	10.45.71.97/32	10.45.71.97 – 10.45.71.97	10.45.71.97
99	10.45.71.98/32	10.45.71.98 – 10.45.71.98	10.45.71.98
100	10.45.71.99/32	10.45.71.99 – 10.45.71.99	10.45.71.99
101	10.45.71.100/32	10.45.71.100 – 10.45.71.100	10.45.71.100
102	10.45.71.101/32	10.45.71.101 – 10.45.71.101	10.45.71.101
103	10.45.71.102/32	10.45.71.102 – 10.45.71.102	10.45.71.102
104	10.45.71.103/32	10.45.71.103 – 10.45.71.103	10.45.71.103
105	10.45.71.104/32	10.45.71.104 – 10.45.71.104	10.45.71.104
106	10.45.71.105/32	10.45.71.105 – 10.45.71.105	10.45.71.105
107	10.45.71.106/32	10.45.71.106 – 10.45.71.106	10.45.71.106
108	10.45.71.107/32	10.45.71.107 – 10.45.71.107	10.45.71.107
109	10.45.71.108/32	10.45.71.108 – 10.45.71.108	10.45.71.108
110	10.45.71.109/32	10.45.71.109 – 10.45.71.109	10.45.71.109
111	10.45.71.110/32	10.45.71.110 – 10.45.71.110	10.45.71.110
112	10.45.71.111/32	10.45.71.111 – 10.45.71.111	10.45.71.111
113	10.45.71.112/32	10.45.71.112 – 10.45.71.112	10.45.71.112
114	10.45.71.113/32	10.45.71.113 – 10.45.71.113	10.45.71.113
115	10.45.71.114/32	10.45.71.114 – 10.45.71.114	10.45.71.114
116	10.45.71.115/32	10.45.71.115 – 10.45.71.115	10.45.71.115
117	10.45.71.116/32	10.45.71.116 – 10.45.71.116	10.45.71.116
118	10.45.71.117/32	10.45.71.117 – 10.45.71.117	10.45.71.117
119	10.45.71.118/32	10.45.71.118 – 10.45.71.118	10.45.71.118
120	10.45.71.119/32	10.45.71.119 – 10.45.71.119	10.45.71.119
121	10.45.71.120/32	10.45.71.120 – 10.45.71.120	10.45.71.120
122	10.45.71.121/32	10.45.71.121 – 10.45.71.121	10.45.71.121
123	10.45.71.122/32	10.45.71.122 – 10.45.71.122	10.45.71.122
124	10.45.71.123/32	10.45.71.123 – 10.45.71.123	10.45.71.123
125	10.45.71.124/32	10.45.71.124 – 10.45.71.124	10.45.71.124
126	10.45.71.125/32	10.45.71.125 – 10.45.71.125	10.45.71.125
127	10.45.71.126/32	10.45.71.126 – 10.45.71.126	10.45.71.126
128	10.45.71.127/32	10.45.71.127 – 10.45.71.127	10.45.71.127
129	10.45.71.128/32	10.45.71.128 – 10.45.71.128	10.45.71.128
130	10.45.71.129/32	10.45.71.129 – 10.45.71.129	10.45.71.129
131	10.45.71.130/32	10.45.71.130 – 10.45.71.130	10.45.71.130
132	10.45.71.131/32	10.45.71.131 – 10.45.71.131	10.45.71.131
133	10.45.71.132/32	10.45.71.132 – 10.45.71.132	10.45.71.132
134	10.45.71.133/32	10.45.71.133 – 10.45.71.133	10.45.71.133
135	10.45.71.134/32	10.45.71.134 – 10.45.71.134	10.45.71.134
136	10.45.71.135/32	10.45.71.135 – 10.45.71.135	10.45.71.135
137	10.45.71.136/32	10.45.71.136 – 10.45.71.136	10.45.71.136
138	10.45.71.137/32	10.45.71.137 – 10.45.71.137	10.45.71.137
139	10.45.71.138/32	10.45.71.138 – 10.45.71.138	10.45.71.138
140	10.45.71.139/32	10.45.71.139 – 10.45.71.139	10.45.71.139
141	10.45.71.140/32	10.45.71.140 – 10.45.71.140	10.45.71.140
142	10.45.71.141/32	10.45.71.141 – 10.45.71.141	10.45.71.141
143	10.45.71.142/32	10.45.71.142 – 10.45.71.142	10.45.71.142
144	10.45.71.143/32	10.45.71.143 – 10.45.71.143	10.45.71.143
145	10.45.71.144/32	10.45.71.144 – 10.45.71.144	10.45.71.144
146	10.45.71.145/32	10.45.71.145 – 10.45.71.145	10.45.71.145
147	10.45.71.146/32	10.45.71.146 – 10.45.71.146	10.45.71.146
148	10.45.71.147/32	10.45.71.147 – 10.45.71.147	10.45.71.147
149	10.45.71.148/32	10.45.71.148 – 10.45.71.148	10.45.71.148
150	10.45.71.149/32	10.45.71.149 – 10.45.71.149	10.45.71.149
151	10.45.71.150/32	10.45.71.150 – 10.45.71.150	10.45.71.150
152	10.45.71.151/32	10.45.71.151 – 10.45.71.151	10.45.71.151
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154	10.45.71.153/32	10.45.71.153 – 10.45.71.153	10.45.71.153
155	10.45.71.154/32	10.45.71.154 – 10.45.71.154	10.45.71.154
156	10.45.71.155/32	10.45.71.155 – 10.45.71.155	10.45.71.155
157	10.45.71.156/32	10.45.71.156 – 10.45.71.156	10.45.71.156
158	10.45.71.157/32	10.45.71.157 – 10.45.71.157	10.45.71.157
159	10.45.71.158/32	10.45.71.158 – 10.45.71.158	10.45.71.158
160	10.45.71.159/32	10.45.71.159 – 10.45.71.159	10.45.71.159
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210	10.45.71.209/32	10.45.71.209 – 10.45.71.209	10.45.71.209
211	10.45.71.210/32	10.45.71.210 – 10.45.71.210	10.45.71.210
212	10.45.71.211/32	10.45.71.211 – 10.45.71.211	10.45.71.211
213	10.45.71.212/32	10.45.71.212 – 10.45.71.212	10.45.71.212
214	10.45.71.213/32	10.45.71.213 – 10.45.71.213	10.45.71.213
215	10.45.71.214/32	10.45.71.214 – 10.45.71.214	10.45.71.214
216	10.45.71.215/32	10.45.71.215 – 10.45.71.215	10.45.71.215
217	10.45.71.216/32	10.45.71.216 – 10.45.71.216	10.45.71.216
218	10.45.71.217/32	10.45.71.217 – 10.45.71.217	10.45.71.217
219	10.45.71.218/32	10.45.71.218 – 10.45.71.218	10.45.71.218
220	10.45.71.219/32	10.45.71.219 – 10.45.71.219	10.45.71.219
221	10.45.71.220/32	10.45.71.220 – 10.45.71.220	10.45.71.220
222	10.45.71.221/32	10.45.71.221 – 10.45.71.221	10.45.71.221
223	10.45.71.222/32	10.45.71.222 – 10.45.71.222	10.45.71.222
224	10.45.71.223/32	10.45.71.223 – 10.45.71.223	10.45.71.223
225	10.45.71.224/32	10.45.71.224 – 10.45.71.224	10.45.71.224
226	10.45.71.225/32	10.45.71.225 – 10.45.71.225	10.45.71.225
227	10.45.71.226/32	10.45.71.226 – 10.45.71.226	10.45.71.226
228	10.45.71.227/32	10.45.71.227 – 10.45.71.227	10.45.71.227
229	10.45.71.228/32	10.45.71.228 – 10.45.71.228	10.45.71.228
230	10.45.71.229/32	10.45.71.229 – 10.45.71.229	10.45.71.229
231	10.45.71.230/32	10.45.71.230 – 10.45.71.230	10.45.71.230
232	10.45.71.231/32	10.45.71.231 – 10.45.71.231	10.45.71.231
233	10.45.71.232/32	10.45.71.232 – 10.45.71.232	10.45.71.232
234	10.45.71.233/32	10.45.71.233 – 10.45.71.233	10.45.71.233
235	10.45.71.234/32	10.45.71.234 – 10.45.71.234	10.45.71.234
236	10.45.71.235/32	10.45.71.235 – 10.45.71.235	10.45.71.235
237	10.45.71.236/32	10.45.71.236 – 10.45.71.236	10.45.71.236
238	10.45.71.237/32	10.45.71.237 – 10.45.71.237	10.45.71.237
239	10.45.71.238/32	10.45.71.238 – 10.45.71.238	10.45.71.238
240	10.45.71.239/32	10.45.71.239 – 10.45.71.239	10.45.71.239
241	10.45.71.240/32	10.45.71.240 – 10.45.71.240	10.45.71.240
242	10.45.71.241/32	10.45.71.241 – 10.45.71.241	10.45.71.241
243	10.45.71.242/32	10.45.71.242 – 10.45.71.242	10.45.71.242
244	10.45.71.243/32	10.45.71.243 – 10.45.71.243	10.45.71.243
245	10.45.71.244/32	10.45.71.244 – 10.45.71.244	10.45.71.244
246	10.45.71.245/32	10.45.71.245 – 10.45.71.245	10.45.71.245
247	10.45.71.246/32	10.45.71.246 – 10.45.71.246	10.45.71.246
248	10.45.71.247/32	10.45.71.247 – 10.45.71.247	10.45.71.247
249	10.45.71.248/32	10.45.71.248 – 10.45.71.248	10.45.71.248
250	10.45.71.249/32	10.45.71.249 – 10.45.71.249	10.45.71.249
251	10.45.71.250/32	10.45.71.250 – 10.45.71.250	10.45.71.250
252	10.45.71.251/32	10.45.71.251 – 10.45.71.251	10.45.71.251
253	10.45.71.252/32	10.45.71.252 – 10.45.71.252	10.45.71.252
254	10.45.71.253/32	10.45.71.253 – 10.45.71.253	10.45.71.253
255	10.45.71.254/32	10.45.71.254 – 10.45.71.254	10.45.71.254
256	10.45.71.255/32	10.45.71.255 – 10.45.71.255	10.45.71.255

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 →