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)10.45.45.0/24

network10.45.45.0/24

broadcast10.45.45.255

first host10.45.45.1

last host10.45.45.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.45.45.0/24

address00001010.00101101.00101101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00101101.00101101.00000000

broadcast00001010.00101101.00101101.11111111

green = network part, grey = host part

hex0x0a2d2d00

decimal170732800

reverse dns0.45.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:2d00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.45.45.0/32	10.45.45.0 – 10.45.45.0	10.45.45.0
2	10.45.45.1/32	10.45.45.1 – 10.45.45.1	10.45.45.1
3	10.45.45.2/32	10.45.45.2 – 10.45.45.2	10.45.45.2
4	10.45.45.3/32	10.45.45.3 – 10.45.45.3	10.45.45.3
5	10.45.45.4/32	10.45.45.4 – 10.45.45.4	10.45.45.4
6	10.45.45.5/32	10.45.45.5 – 10.45.45.5	10.45.45.5
7	10.45.45.6/32	10.45.45.6 – 10.45.45.6	10.45.45.6
8	10.45.45.7/32	10.45.45.7 – 10.45.45.7	10.45.45.7
9	10.45.45.8/32	10.45.45.8 – 10.45.45.8	10.45.45.8
10	10.45.45.9/32	10.45.45.9 – 10.45.45.9	10.45.45.9
11	10.45.45.10/32	10.45.45.10 – 10.45.45.10	10.45.45.10
12	10.45.45.11/32	10.45.45.11 – 10.45.45.11	10.45.45.11
13	10.45.45.12/32	10.45.45.12 – 10.45.45.12	10.45.45.12
14	10.45.45.13/32	10.45.45.13 – 10.45.45.13	10.45.45.13
15	10.45.45.14/32	10.45.45.14 – 10.45.45.14	10.45.45.14
16	10.45.45.15/32	10.45.45.15 – 10.45.45.15	10.45.45.15
17	10.45.45.16/32	10.45.45.16 – 10.45.45.16	10.45.45.16
18	10.45.45.17/32	10.45.45.17 – 10.45.45.17	10.45.45.17
19	10.45.45.18/32	10.45.45.18 – 10.45.45.18	10.45.45.18
20	10.45.45.19/32	10.45.45.19 – 10.45.45.19	10.45.45.19
21	10.45.45.20/32	10.45.45.20 – 10.45.45.20	10.45.45.20
22	10.45.45.21/32	10.45.45.21 – 10.45.45.21	10.45.45.21
23	10.45.45.22/32	10.45.45.22 – 10.45.45.22	10.45.45.22
24	10.45.45.23/32	10.45.45.23 – 10.45.45.23	10.45.45.23
25	10.45.45.24/32	10.45.45.24 – 10.45.45.24	10.45.45.24
26	10.45.45.25/32	10.45.45.25 – 10.45.45.25	10.45.45.25
27	10.45.45.26/32	10.45.45.26 – 10.45.45.26	10.45.45.26
28	10.45.45.27/32	10.45.45.27 – 10.45.45.27	10.45.45.27
29	10.45.45.28/32	10.45.45.28 – 10.45.45.28	10.45.45.28
30	10.45.45.29/32	10.45.45.29 – 10.45.45.29	10.45.45.29
31	10.45.45.30/32	10.45.45.30 – 10.45.45.30	10.45.45.30
32	10.45.45.31/32	10.45.45.31 – 10.45.45.31	10.45.45.31
33	10.45.45.32/32	10.45.45.32 – 10.45.45.32	10.45.45.32
34	10.45.45.33/32	10.45.45.33 – 10.45.45.33	10.45.45.33
35	10.45.45.34/32	10.45.45.34 – 10.45.45.34	10.45.45.34
36	10.45.45.35/32	10.45.45.35 – 10.45.45.35	10.45.45.35
37	10.45.45.36/32	10.45.45.36 – 10.45.45.36	10.45.45.36
38	10.45.45.37/32	10.45.45.37 – 10.45.45.37	10.45.45.37
39	10.45.45.38/32	10.45.45.38 – 10.45.45.38	10.45.45.38
40	10.45.45.39/32	10.45.45.39 – 10.45.45.39	10.45.45.39
41	10.45.45.40/32	10.45.45.40 – 10.45.45.40	10.45.45.40
42	10.45.45.41/32	10.45.45.41 – 10.45.45.41	10.45.45.41
43	10.45.45.42/32	10.45.45.42 – 10.45.45.42	10.45.45.42
44	10.45.45.43/32	10.45.45.43 – 10.45.45.43	10.45.45.43
45	10.45.45.44/32	10.45.45.44 – 10.45.45.44	10.45.45.44
46	10.45.45.45/32	10.45.45.45 – 10.45.45.45	10.45.45.45
47	10.45.45.46/32	10.45.45.46 – 10.45.45.46	10.45.45.46
48	10.45.45.47/32	10.45.45.47 – 10.45.45.47	10.45.45.47
49	10.45.45.48/32	10.45.45.48 – 10.45.45.48	10.45.45.48
50	10.45.45.49/32	10.45.45.49 – 10.45.45.49	10.45.45.49
51	10.45.45.50/32	10.45.45.50 – 10.45.45.50	10.45.45.50
52	10.45.45.51/32	10.45.45.51 – 10.45.45.51	10.45.45.51
53	10.45.45.52/32	10.45.45.52 – 10.45.45.52	10.45.45.52
54	10.45.45.53/32	10.45.45.53 – 10.45.45.53	10.45.45.53
55	10.45.45.54/32	10.45.45.54 – 10.45.45.54	10.45.45.54
56	10.45.45.55/32	10.45.45.55 – 10.45.45.55	10.45.45.55
57	10.45.45.56/32	10.45.45.56 – 10.45.45.56	10.45.45.56
58	10.45.45.57/32	10.45.45.57 – 10.45.45.57	10.45.45.57
59	10.45.45.58/32	10.45.45.58 – 10.45.45.58	10.45.45.58
60	10.45.45.59/32	10.45.45.59 – 10.45.45.59	10.45.45.59
61	10.45.45.60/32	10.45.45.60 – 10.45.45.60	10.45.45.60
62	10.45.45.61/32	10.45.45.61 – 10.45.45.61	10.45.45.61
63	10.45.45.62/32	10.45.45.62 – 10.45.45.62	10.45.45.62
64	10.45.45.63/32	10.45.45.63 – 10.45.45.63	10.45.45.63
65	10.45.45.64/32	10.45.45.64 – 10.45.45.64	10.45.45.64
66	10.45.45.65/32	10.45.45.65 – 10.45.45.65	10.45.45.65
67	10.45.45.66/32	10.45.45.66 – 10.45.45.66	10.45.45.66
68	10.45.45.67/32	10.45.45.67 – 10.45.45.67	10.45.45.67
69	10.45.45.68/32	10.45.45.68 – 10.45.45.68	10.45.45.68
70	10.45.45.69/32	10.45.45.69 – 10.45.45.69	10.45.45.69
71	10.45.45.70/32	10.45.45.70 – 10.45.45.70	10.45.45.70
72	10.45.45.71/32	10.45.45.71 – 10.45.45.71	10.45.45.71
73	10.45.45.72/32	10.45.45.72 – 10.45.45.72	10.45.45.72
74	10.45.45.73/32	10.45.45.73 – 10.45.45.73	10.45.45.73
75	10.45.45.74/32	10.45.45.74 – 10.45.45.74	10.45.45.74
76	10.45.45.75/32	10.45.45.75 – 10.45.45.75	10.45.45.75
77	10.45.45.76/32	10.45.45.76 – 10.45.45.76	10.45.45.76
78	10.45.45.77/32	10.45.45.77 – 10.45.45.77	10.45.45.77
79	10.45.45.78/32	10.45.45.78 – 10.45.45.78	10.45.45.78
80	10.45.45.79/32	10.45.45.79 – 10.45.45.79	10.45.45.79
81	10.45.45.80/32	10.45.45.80 – 10.45.45.80	10.45.45.80
82	10.45.45.81/32	10.45.45.81 – 10.45.45.81	10.45.45.81
83	10.45.45.82/32	10.45.45.82 – 10.45.45.82	10.45.45.82
84	10.45.45.83/32	10.45.45.83 – 10.45.45.83	10.45.45.83
85	10.45.45.84/32	10.45.45.84 – 10.45.45.84	10.45.45.84
86	10.45.45.85/32	10.45.45.85 – 10.45.45.85	10.45.45.85
87	10.45.45.86/32	10.45.45.86 – 10.45.45.86	10.45.45.86
88	10.45.45.87/32	10.45.45.87 – 10.45.45.87	10.45.45.87
89	10.45.45.88/32	10.45.45.88 – 10.45.45.88	10.45.45.88
90	10.45.45.89/32	10.45.45.89 – 10.45.45.89	10.45.45.89
91	10.45.45.90/32	10.45.45.90 – 10.45.45.90	10.45.45.90
92	10.45.45.91/32	10.45.45.91 – 10.45.45.91	10.45.45.91
93	10.45.45.92/32	10.45.45.92 – 10.45.45.92	10.45.45.92
94	10.45.45.93/32	10.45.45.93 – 10.45.45.93	10.45.45.93
95	10.45.45.94/32	10.45.45.94 – 10.45.45.94	10.45.45.94
96	10.45.45.95/32	10.45.45.95 – 10.45.45.95	10.45.45.95
97	10.45.45.96/32	10.45.45.96 – 10.45.45.96	10.45.45.96
98	10.45.45.97/32	10.45.45.97 – 10.45.45.97	10.45.45.97
99	10.45.45.98/32	10.45.45.98 – 10.45.45.98	10.45.45.98
100	10.45.45.99/32	10.45.45.99 – 10.45.45.99	10.45.45.99
101	10.45.45.100/32	10.45.45.100 – 10.45.45.100	10.45.45.100
102	10.45.45.101/32	10.45.45.101 – 10.45.45.101	10.45.45.101
103	10.45.45.102/32	10.45.45.102 – 10.45.45.102	10.45.45.102
104	10.45.45.103/32	10.45.45.103 – 10.45.45.103	10.45.45.103
105	10.45.45.104/32	10.45.45.104 – 10.45.45.104	10.45.45.104
106	10.45.45.105/32	10.45.45.105 – 10.45.45.105	10.45.45.105
107	10.45.45.106/32	10.45.45.106 – 10.45.45.106	10.45.45.106
108	10.45.45.107/32	10.45.45.107 – 10.45.45.107	10.45.45.107
109	10.45.45.108/32	10.45.45.108 – 10.45.45.108	10.45.45.108
110	10.45.45.109/32	10.45.45.109 – 10.45.45.109	10.45.45.109
111	10.45.45.110/32	10.45.45.110 – 10.45.45.110	10.45.45.110
112	10.45.45.111/32	10.45.45.111 – 10.45.45.111	10.45.45.111
113	10.45.45.112/32	10.45.45.112 – 10.45.45.112	10.45.45.112
114	10.45.45.113/32	10.45.45.113 – 10.45.45.113	10.45.45.113
115	10.45.45.114/32	10.45.45.114 – 10.45.45.114	10.45.45.114
116	10.45.45.115/32	10.45.45.115 – 10.45.45.115	10.45.45.115
117	10.45.45.116/32	10.45.45.116 – 10.45.45.116	10.45.45.116
118	10.45.45.117/32	10.45.45.117 – 10.45.45.117	10.45.45.117
119	10.45.45.118/32	10.45.45.118 – 10.45.45.118	10.45.45.118
120	10.45.45.119/32	10.45.45.119 – 10.45.45.119	10.45.45.119
121	10.45.45.120/32	10.45.45.120 – 10.45.45.120	10.45.45.120
122	10.45.45.121/32	10.45.45.121 – 10.45.45.121	10.45.45.121
123	10.45.45.122/32	10.45.45.122 – 10.45.45.122	10.45.45.122
124	10.45.45.123/32	10.45.45.123 – 10.45.45.123	10.45.45.123
125	10.45.45.124/32	10.45.45.124 – 10.45.45.124	10.45.45.124
126	10.45.45.125/32	10.45.45.125 – 10.45.45.125	10.45.45.125
127	10.45.45.126/32	10.45.45.126 – 10.45.45.126	10.45.45.126
128	10.45.45.127/32	10.45.45.127 – 10.45.45.127	10.45.45.127
129	10.45.45.128/32	10.45.45.128 – 10.45.45.128	10.45.45.128
130	10.45.45.129/32	10.45.45.129 – 10.45.45.129	10.45.45.129
131	10.45.45.130/32	10.45.45.130 – 10.45.45.130	10.45.45.130
132	10.45.45.131/32	10.45.45.131 – 10.45.45.131	10.45.45.131
133	10.45.45.132/32	10.45.45.132 – 10.45.45.132	10.45.45.132
134	10.45.45.133/32	10.45.45.133 – 10.45.45.133	10.45.45.133
135	10.45.45.134/32	10.45.45.134 – 10.45.45.134	10.45.45.134
136	10.45.45.135/32	10.45.45.135 – 10.45.45.135	10.45.45.135
137	10.45.45.136/32	10.45.45.136 – 10.45.45.136	10.45.45.136
138	10.45.45.137/32	10.45.45.137 – 10.45.45.137	10.45.45.137
139	10.45.45.138/32	10.45.45.138 – 10.45.45.138	10.45.45.138
140	10.45.45.139/32	10.45.45.139 – 10.45.45.139	10.45.45.139
141	10.45.45.140/32	10.45.45.140 – 10.45.45.140	10.45.45.140
142	10.45.45.141/32	10.45.45.141 – 10.45.45.141	10.45.45.141
143	10.45.45.142/32	10.45.45.142 – 10.45.45.142	10.45.45.142
144	10.45.45.143/32	10.45.45.143 – 10.45.45.143	10.45.45.143
145	10.45.45.144/32	10.45.45.144 – 10.45.45.144	10.45.45.144
146	10.45.45.145/32	10.45.45.145 – 10.45.45.145	10.45.45.145
147	10.45.45.146/32	10.45.45.146 – 10.45.45.146	10.45.45.146
148	10.45.45.147/32	10.45.45.147 – 10.45.45.147	10.45.45.147
149	10.45.45.148/32	10.45.45.148 – 10.45.45.148	10.45.45.148
150	10.45.45.149/32	10.45.45.149 – 10.45.45.149	10.45.45.149
151	10.45.45.150/32	10.45.45.150 – 10.45.45.150	10.45.45.150
152	10.45.45.151/32	10.45.45.151 – 10.45.45.151	10.45.45.151
153	10.45.45.152/32	10.45.45.152 – 10.45.45.152	10.45.45.152
154	10.45.45.153/32	10.45.45.153 – 10.45.45.153	10.45.45.153
155	10.45.45.154/32	10.45.45.154 – 10.45.45.154	10.45.45.154
156	10.45.45.155/32	10.45.45.155 – 10.45.45.155	10.45.45.155
157	10.45.45.156/32	10.45.45.156 – 10.45.45.156	10.45.45.156
158	10.45.45.157/32	10.45.45.157 – 10.45.45.157	10.45.45.157
159	10.45.45.158/32	10.45.45.158 – 10.45.45.158	10.45.45.158
160	10.45.45.159/32	10.45.45.159 – 10.45.45.159	10.45.45.159
161	10.45.45.160/32	10.45.45.160 – 10.45.45.160	10.45.45.160
162	10.45.45.161/32	10.45.45.161 – 10.45.45.161	10.45.45.161
163	10.45.45.162/32	10.45.45.162 – 10.45.45.162	10.45.45.162
164	10.45.45.163/32	10.45.45.163 – 10.45.45.163	10.45.45.163
165	10.45.45.164/32	10.45.45.164 – 10.45.45.164	10.45.45.164
166	10.45.45.165/32	10.45.45.165 – 10.45.45.165	10.45.45.165
167	10.45.45.166/32	10.45.45.166 – 10.45.45.166	10.45.45.166
168	10.45.45.167/32	10.45.45.167 – 10.45.45.167	10.45.45.167
169	10.45.45.168/32	10.45.45.168 – 10.45.45.168	10.45.45.168
170	10.45.45.169/32	10.45.45.169 – 10.45.45.169	10.45.45.169
171	10.45.45.170/32	10.45.45.170 – 10.45.45.170	10.45.45.170
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177	10.45.45.176/32	10.45.45.176 – 10.45.45.176	10.45.45.176
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179	10.45.45.178/32	10.45.45.178 – 10.45.45.178	10.45.45.178
180	10.45.45.179/32	10.45.45.179 – 10.45.45.179	10.45.45.179
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201	10.45.45.200/32	10.45.45.200 – 10.45.45.200	10.45.45.200
202	10.45.45.201/32	10.45.45.201 – 10.45.45.201	10.45.45.201
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207	10.45.45.206/32	10.45.45.206 – 10.45.45.206	10.45.45.206
208	10.45.45.207/32	10.45.45.207 – 10.45.45.207	10.45.45.207
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210	10.45.45.209/32	10.45.45.209 – 10.45.45.209	10.45.45.209
211	10.45.45.210/32	10.45.45.210 – 10.45.45.210	10.45.45.210
212	10.45.45.211/32	10.45.45.211 – 10.45.45.211	10.45.45.211
213	10.45.45.212/32	10.45.45.212 – 10.45.45.212	10.45.45.212
214	10.45.45.213/32	10.45.45.213 – 10.45.45.213	10.45.45.213
215	10.45.45.214/32	10.45.45.214 – 10.45.45.214	10.45.45.214
216	10.45.45.215/32	10.45.45.215 – 10.45.45.215	10.45.45.215
217	10.45.45.216/32	10.45.45.216 – 10.45.45.216	10.45.45.216
218	10.45.45.217/32	10.45.45.217 – 10.45.45.217	10.45.45.217
219	10.45.45.218/32	10.45.45.218 – 10.45.45.218	10.45.45.218
220	10.45.45.219/32	10.45.45.219 – 10.45.45.219	10.45.45.219
221	10.45.45.220/32	10.45.45.220 – 10.45.45.220	10.45.45.220
222	10.45.45.221/32	10.45.45.221 – 10.45.45.221	10.45.45.221
223	10.45.45.222/32	10.45.45.222 – 10.45.45.222	10.45.45.222
224	10.45.45.223/32	10.45.45.223 – 10.45.45.223	10.45.45.223
225	10.45.45.224/32	10.45.45.224 – 10.45.45.224	10.45.45.224
226	10.45.45.225/32	10.45.45.225 – 10.45.45.225	10.45.45.225
227	10.45.45.226/32	10.45.45.226 – 10.45.45.226	10.45.45.226
228	10.45.45.227/32	10.45.45.227 – 10.45.45.227	10.45.45.227
229	10.45.45.228/32	10.45.45.228 – 10.45.45.228	10.45.45.228
230	10.45.45.229/32	10.45.45.229 – 10.45.45.229	10.45.45.229
231	10.45.45.230/32	10.45.45.230 – 10.45.45.230	10.45.45.230
232	10.45.45.231/32	10.45.45.231 – 10.45.45.231	10.45.45.231
233	10.45.45.232/32	10.45.45.232 – 10.45.45.232	10.45.45.232
234	10.45.45.233/32	10.45.45.233 – 10.45.45.233	10.45.45.233
235	10.45.45.234/32	10.45.45.234 – 10.45.45.234	10.45.45.234
236	10.45.45.235/32	10.45.45.235 – 10.45.45.235	10.45.45.235
237	10.45.45.236/32	10.45.45.236 – 10.45.45.236	10.45.45.236
238	10.45.45.237/32	10.45.45.237 – 10.45.45.237	10.45.45.237
239	10.45.45.238/32	10.45.45.238 – 10.45.45.238	10.45.45.238
240	10.45.45.239/32	10.45.45.239 – 10.45.45.239	10.45.45.239
241	10.45.45.240/32	10.45.45.240 – 10.45.45.240	10.45.45.240
242	10.45.45.241/32	10.45.45.241 – 10.45.45.241	10.45.45.241
243	10.45.45.242/32	10.45.45.242 – 10.45.45.242	10.45.45.242
244	10.45.45.243/32	10.45.45.243 – 10.45.45.243	10.45.45.243
245	10.45.45.244/32	10.45.45.244 – 10.45.45.244	10.45.45.244
246	10.45.45.245/32	10.45.45.245 – 10.45.45.245	10.45.45.245
247	10.45.45.246/32	10.45.45.246 – 10.45.45.246	10.45.45.246
248	10.45.45.247/32	10.45.45.247 – 10.45.45.247	10.45.45.247
249	10.45.45.248/32	10.45.45.248 – 10.45.45.248	10.45.45.248
250	10.45.45.249/32	10.45.45.249 – 10.45.45.249	10.45.45.249
251	10.45.45.250/32	10.45.45.250 – 10.45.45.250	10.45.45.250
252	10.45.45.251/32	10.45.45.251 – 10.45.45.251	10.45.45.251
253	10.45.45.252/32	10.45.45.252 – 10.45.45.252	10.45.45.252
254	10.45.45.253/32	10.45.45.253 – 10.45.45.253	10.45.45.253
255	10.45.45.254/32	10.45.45.254 – 10.45.45.254	10.45.45.254
256	10.45.45.255/32	10.45.45.255 – 10.45.45.255	10.45.45.255

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 →