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)10.45.55.0/24

network10.45.55.0/24

broadcast10.45.55.255

first host10.45.55.1

last host10.45.55.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.45.55.0/24

address00001010.00101101.00110111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00101101.00110111.00000000

broadcast00001010.00101101.00110111.11111111

green = network part, grey = host part

hex0x0a2d3700

decimal170735360

reverse dns0.55.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:3700

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.45.55.0/32	10.45.55.0 – 10.45.55.0	10.45.55.0
2	10.45.55.1/32	10.45.55.1 – 10.45.55.1	10.45.55.1
3	10.45.55.2/32	10.45.55.2 – 10.45.55.2	10.45.55.2
4	10.45.55.3/32	10.45.55.3 – 10.45.55.3	10.45.55.3
5	10.45.55.4/32	10.45.55.4 – 10.45.55.4	10.45.55.4
6	10.45.55.5/32	10.45.55.5 – 10.45.55.5	10.45.55.5
7	10.45.55.6/32	10.45.55.6 – 10.45.55.6	10.45.55.6
8	10.45.55.7/32	10.45.55.7 – 10.45.55.7	10.45.55.7
9	10.45.55.8/32	10.45.55.8 – 10.45.55.8	10.45.55.8
10	10.45.55.9/32	10.45.55.9 – 10.45.55.9	10.45.55.9
11	10.45.55.10/32	10.45.55.10 – 10.45.55.10	10.45.55.10
12	10.45.55.11/32	10.45.55.11 – 10.45.55.11	10.45.55.11
13	10.45.55.12/32	10.45.55.12 – 10.45.55.12	10.45.55.12
14	10.45.55.13/32	10.45.55.13 – 10.45.55.13	10.45.55.13
15	10.45.55.14/32	10.45.55.14 – 10.45.55.14	10.45.55.14
16	10.45.55.15/32	10.45.55.15 – 10.45.55.15	10.45.55.15
17	10.45.55.16/32	10.45.55.16 – 10.45.55.16	10.45.55.16
18	10.45.55.17/32	10.45.55.17 – 10.45.55.17	10.45.55.17
19	10.45.55.18/32	10.45.55.18 – 10.45.55.18	10.45.55.18
20	10.45.55.19/32	10.45.55.19 – 10.45.55.19	10.45.55.19
21	10.45.55.20/32	10.45.55.20 – 10.45.55.20	10.45.55.20
22	10.45.55.21/32	10.45.55.21 – 10.45.55.21	10.45.55.21
23	10.45.55.22/32	10.45.55.22 – 10.45.55.22	10.45.55.22
24	10.45.55.23/32	10.45.55.23 – 10.45.55.23	10.45.55.23
25	10.45.55.24/32	10.45.55.24 – 10.45.55.24	10.45.55.24
26	10.45.55.25/32	10.45.55.25 – 10.45.55.25	10.45.55.25
27	10.45.55.26/32	10.45.55.26 – 10.45.55.26	10.45.55.26
28	10.45.55.27/32	10.45.55.27 – 10.45.55.27	10.45.55.27
29	10.45.55.28/32	10.45.55.28 – 10.45.55.28	10.45.55.28
30	10.45.55.29/32	10.45.55.29 – 10.45.55.29	10.45.55.29
31	10.45.55.30/32	10.45.55.30 – 10.45.55.30	10.45.55.30
32	10.45.55.31/32	10.45.55.31 – 10.45.55.31	10.45.55.31
33	10.45.55.32/32	10.45.55.32 – 10.45.55.32	10.45.55.32
34	10.45.55.33/32	10.45.55.33 – 10.45.55.33	10.45.55.33
35	10.45.55.34/32	10.45.55.34 – 10.45.55.34	10.45.55.34
36	10.45.55.35/32	10.45.55.35 – 10.45.55.35	10.45.55.35
37	10.45.55.36/32	10.45.55.36 – 10.45.55.36	10.45.55.36
38	10.45.55.37/32	10.45.55.37 – 10.45.55.37	10.45.55.37
39	10.45.55.38/32	10.45.55.38 – 10.45.55.38	10.45.55.38
40	10.45.55.39/32	10.45.55.39 – 10.45.55.39	10.45.55.39
41	10.45.55.40/32	10.45.55.40 – 10.45.55.40	10.45.55.40
42	10.45.55.41/32	10.45.55.41 – 10.45.55.41	10.45.55.41
43	10.45.55.42/32	10.45.55.42 – 10.45.55.42	10.45.55.42
44	10.45.55.43/32	10.45.55.43 – 10.45.55.43	10.45.55.43
45	10.45.55.44/32	10.45.55.44 – 10.45.55.44	10.45.55.44
46	10.45.55.45/32	10.45.55.45 – 10.45.55.45	10.45.55.45
47	10.45.55.46/32	10.45.55.46 – 10.45.55.46	10.45.55.46
48	10.45.55.47/32	10.45.55.47 – 10.45.55.47	10.45.55.47
49	10.45.55.48/32	10.45.55.48 – 10.45.55.48	10.45.55.48
50	10.45.55.49/32	10.45.55.49 – 10.45.55.49	10.45.55.49
51	10.45.55.50/32	10.45.55.50 – 10.45.55.50	10.45.55.50
52	10.45.55.51/32	10.45.55.51 – 10.45.55.51	10.45.55.51
53	10.45.55.52/32	10.45.55.52 – 10.45.55.52	10.45.55.52
54	10.45.55.53/32	10.45.55.53 – 10.45.55.53	10.45.55.53
55	10.45.55.54/32	10.45.55.54 – 10.45.55.54	10.45.55.54
56	10.45.55.55/32	10.45.55.55 – 10.45.55.55	10.45.55.55
57	10.45.55.56/32	10.45.55.56 – 10.45.55.56	10.45.55.56
58	10.45.55.57/32	10.45.55.57 – 10.45.55.57	10.45.55.57
59	10.45.55.58/32	10.45.55.58 – 10.45.55.58	10.45.55.58
60	10.45.55.59/32	10.45.55.59 – 10.45.55.59	10.45.55.59
61	10.45.55.60/32	10.45.55.60 – 10.45.55.60	10.45.55.60
62	10.45.55.61/32	10.45.55.61 – 10.45.55.61	10.45.55.61
63	10.45.55.62/32	10.45.55.62 – 10.45.55.62	10.45.55.62
64	10.45.55.63/32	10.45.55.63 – 10.45.55.63	10.45.55.63
65	10.45.55.64/32	10.45.55.64 – 10.45.55.64	10.45.55.64
66	10.45.55.65/32	10.45.55.65 – 10.45.55.65	10.45.55.65
67	10.45.55.66/32	10.45.55.66 – 10.45.55.66	10.45.55.66
68	10.45.55.67/32	10.45.55.67 – 10.45.55.67	10.45.55.67
69	10.45.55.68/32	10.45.55.68 – 10.45.55.68	10.45.55.68
70	10.45.55.69/32	10.45.55.69 – 10.45.55.69	10.45.55.69
71	10.45.55.70/32	10.45.55.70 – 10.45.55.70	10.45.55.70
72	10.45.55.71/32	10.45.55.71 – 10.45.55.71	10.45.55.71
73	10.45.55.72/32	10.45.55.72 – 10.45.55.72	10.45.55.72
74	10.45.55.73/32	10.45.55.73 – 10.45.55.73	10.45.55.73
75	10.45.55.74/32	10.45.55.74 – 10.45.55.74	10.45.55.74
76	10.45.55.75/32	10.45.55.75 – 10.45.55.75	10.45.55.75
77	10.45.55.76/32	10.45.55.76 – 10.45.55.76	10.45.55.76
78	10.45.55.77/32	10.45.55.77 – 10.45.55.77	10.45.55.77
79	10.45.55.78/32	10.45.55.78 – 10.45.55.78	10.45.55.78
80	10.45.55.79/32	10.45.55.79 – 10.45.55.79	10.45.55.79
81	10.45.55.80/32	10.45.55.80 – 10.45.55.80	10.45.55.80
82	10.45.55.81/32	10.45.55.81 – 10.45.55.81	10.45.55.81
83	10.45.55.82/32	10.45.55.82 – 10.45.55.82	10.45.55.82
84	10.45.55.83/32	10.45.55.83 – 10.45.55.83	10.45.55.83
85	10.45.55.84/32	10.45.55.84 – 10.45.55.84	10.45.55.84
86	10.45.55.85/32	10.45.55.85 – 10.45.55.85	10.45.55.85
87	10.45.55.86/32	10.45.55.86 – 10.45.55.86	10.45.55.86
88	10.45.55.87/32	10.45.55.87 – 10.45.55.87	10.45.55.87
89	10.45.55.88/32	10.45.55.88 – 10.45.55.88	10.45.55.88
90	10.45.55.89/32	10.45.55.89 – 10.45.55.89	10.45.55.89
91	10.45.55.90/32	10.45.55.90 – 10.45.55.90	10.45.55.90
92	10.45.55.91/32	10.45.55.91 – 10.45.55.91	10.45.55.91
93	10.45.55.92/32	10.45.55.92 – 10.45.55.92	10.45.55.92
94	10.45.55.93/32	10.45.55.93 – 10.45.55.93	10.45.55.93
95	10.45.55.94/32	10.45.55.94 – 10.45.55.94	10.45.55.94
96	10.45.55.95/32	10.45.55.95 – 10.45.55.95	10.45.55.95
97	10.45.55.96/32	10.45.55.96 – 10.45.55.96	10.45.55.96
98	10.45.55.97/32	10.45.55.97 – 10.45.55.97	10.45.55.97
99	10.45.55.98/32	10.45.55.98 – 10.45.55.98	10.45.55.98
100	10.45.55.99/32	10.45.55.99 – 10.45.55.99	10.45.55.99
101	10.45.55.100/32	10.45.55.100 – 10.45.55.100	10.45.55.100
102	10.45.55.101/32	10.45.55.101 – 10.45.55.101	10.45.55.101
103	10.45.55.102/32	10.45.55.102 – 10.45.55.102	10.45.55.102
104	10.45.55.103/32	10.45.55.103 – 10.45.55.103	10.45.55.103
105	10.45.55.104/32	10.45.55.104 – 10.45.55.104	10.45.55.104
106	10.45.55.105/32	10.45.55.105 – 10.45.55.105	10.45.55.105
107	10.45.55.106/32	10.45.55.106 – 10.45.55.106	10.45.55.106
108	10.45.55.107/32	10.45.55.107 – 10.45.55.107	10.45.55.107
109	10.45.55.108/32	10.45.55.108 – 10.45.55.108	10.45.55.108
110	10.45.55.109/32	10.45.55.109 – 10.45.55.109	10.45.55.109
111	10.45.55.110/32	10.45.55.110 – 10.45.55.110	10.45.55.110
112	10.45.55.111/32	10.45.55.111 – 10.45.55.111	10.45.55.111
113	10.45.55.112/32	10.45.55.112 – 10.45.55.112	10.45.55.112
114	10.45.55.113/32	10.45.55.113 – 10.45.55.113	10.45.55.113
115	10.45.55.114/32	10.45.55.114 – 10.45.55.114	10.45.55.114
116	10.45.55.115/32	10.45.55.115 – 10.45.55.115	10.45.55.115
117	10.45.55.116/32	10.45.55.116 – 10.45.55.116	10.45.55.116
118	10.45.55.117/32	10.45.55.117 – 10.45.55.117	10.45.55.117
119	10.45.55.118/32	10.45.55.118 – 10.45.55.118	10.45.55.118
120	10.45.55.119/32	10.45.55.119 – 10.45.55.119	10.45.55.119
121	10.45.55.120/32	10.45.55.120 – 10.45.55.120	10.45.55.120
122	10.45.55.121/32	10.45.55.121 – 10.45.55.121	10.45.55.121
123	10.45.55.122/32	10.45.55.122 – 10.45.55.122	10.45.55.122
124	10.45.55.123/32	10.45.55.123 – 10.45.55.123	10.45.55.123
125	10.45.55.124/32	10.45.55.124 – 10.45.55.124	10.45.55.124
126	10.45.55.125/32	10.45.55.125 – 10.45.55.125	10.45.55.125
127	10.45.55.126/32	10.45.55.126 – 10.45.55.126	10.45.55.126
128	10.45.55.127/32	10.45.55.127 – 10.45.55.127	10.45.55.127
129	10.45.55.128/32	10.45.55.128 – 10.45.55.128	10.45.55.128
130	10.45.55.129/32	10.45.55.129 – 10.45.55.129	10.45.55.129
131	10.45.55.130/32	10.45.55.130 – 10.45.55.130	10.45.55.130
132	10.45.55.131/32	10.45.55.131 – 10.45.55.131	10.45.55.131
133	10.45.55.132/32	10.45.55.132 – 10.45.55.132	10.45.55.132
134	10.45.55.133/32	10.45.55.133 – 10.45.55.133	10.45.55.133
135	10.45.55.134/32	10.45.55.134 – 10.45.55.134	10.45.55.134
136	10.45.55.135/32	10.45.55.135 – 10.45.55.135	10.45.55.135
137	10.45.55.136/32	10.45.55.136 – 10.45.55.136	10.45.55.136
138	10.45.55.137/32	10.45.55.137 – 10.45.55.137	10.45.55.137
139	10.45.55.138/32	10.45.55.138 – 10.45.55.138	10.45.55.138
140	10.45.55.139/32	10.45.55.139 – 10.45.55.139	10.45.55.139
141	10.45.55.140/32	10.45.55.140 – 10.45.55.140	10.45.55.140
142	10.45.55.141/32	10.45.55.141 – 10.45.55.141	10.45.55.141
143	10.45.55.142/32	10.45.55.142 – 10.45.55.142	10.45.55.142
144	10.45.55.143/32	10.45.55.143 – 10.45.55.143	10.45.55.143
145	10.45.55.144/32	10.45.55.144 – 10.45.55.144	10.45.55.144
146	10.45.55.145/32	10.45.55.145 – 10.45.55.145	10.45.55.145
147	10.45.55.146/32	10.45.55.146 – 10.45.55.146	10.45.55.146
148	10.45.55.147/32	10.45.55.147 – 10.45.55.147	10.45.55.147
149	10.45.55.148/32	10.45.55.148 – 10.45.55.148	10.45.55.148
150	10.45.55.149/32	10.45.55.149 – 10.45.55.149	10.45.55.149
151	10.45.55.150/32	10.45.55.150 – 10.45.55.150	10.45.55.150
152	10.45.55.151/32	10.45.55.151 – 10.45.55.151	10.45.55.151
153	10.45.55.152/32	10.45.55.152 – 10.45.55.152	10.45.55.152
154	10.45.55.153/32	10.45.55.153 – 10.45.55.153	10.45.55.153
155	10.45.55.154/32	10.45.55.154 – 10.45.55.154	10.45.55.154
156	10.45.55.155/32	10.45.55.155 – 10.45.55.155	10.45.55.155
157	10.45.55.156/32	10.45.55.156 – 10.45.55.156	10.45.55.156
158	10.45.55.157/32	10.45.55.157 – 10.45.55.157	10.45.55.157
159	10.45.55.158/32	10.45.55.158 – 10.45.55.158	10.45.55.158
160	10.45.55.159/32	10.45.55.159 – 10.45.55.159	10.45.55.159
161	10.45.55.160/32	10.45.55.160 – 10.45.55.160	10.45.55.160
162	10.45.55.161/32	10.45.55.161 – 10.45.55.161	10.45.55.161
163	10.45.55.162/32	10.45.55.162 – 10.45.55.162	10.45.55.162
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166	10.45.55.165/32	10.45.55.165 – 10.45.55.165	10.45.55.165
167	10.45.55.166/32	10.45.55.166 – 10.45.55.166	10.45.55.166
168	10.45.55.167/32	10.45.55.167 – 10.45.55.167	10.45.55.167
169	10.45.55.168/32	10.45.55.168 – 10.45.55.168	10.45.55.168
170	10.45.55.169/32	10.45.55.169 – 10.45.55.169	10.45.55.169
171	10.45.55.170/32	10.45.55.170 – 10.45.55.170	10.45.55.170
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210	10.45.55.209/32	10.45.55.209 – 10.45.55.209	10.45.55.209
211	10.45.55.210/32	10.45.55.210 – 10.45.55.210	10.45.55.210
212	10.45.55.211/32	10.45.55.211 – 10.45.55.211	10.45.55.211
213	10.45.55.212/32	10.45.55.212 – 10.45.55.212	10.45.55.212
214	10.45.55.213/32	10.45.55.213 – 10.45.55.213	10.45.55.213
215	10.45.55.214/32	10.45.55.214 – 10.45.55.214	10.45.55.214
216	10.45.55.215/32	10.45.55.215 – 10.45.55.215	10.45.55.215
217	10.45.55.216/32	10.45.55.216 – 10.45.55.216	10.45.55.216
218	10.45.55.217/32	10.45.55.217 – 10.45.55.217	10.45.55.217
219	10.45.55.218/32	10.45.55.218 – 10.45.55.218	10.45.55.218
220	10.45.55.219/32	10.45.55.219 – 10.45.55.219	10.45.55.219
221	10.45.55.220/32	10.45.55.220 – 10.45.55.220	10.45.55.220
222	10.45.55.221/32	10.45.55.221 – 10.45.55.221	10.45.55.221
223	10.45.55.222/32	10.45.55.222 – 10.45.55.222	10.45.55.222
224	10.45.55.223/32	10.45.55.223 – 10.45.55.223	10.45.55.223
225	10.45.55.224/32	10.45.55.224 – 10.45.55.224	10.45.55.224
226	10.45.55.225/32	10.45.55.225 – 10.45.55.225	10.45.55.225
227	10.45.55.226/32	10.45.55.226 – 10.45.55.226	10.45.55.226
228	10.45.55.227/32	10.45.55.227 – 10.45.55.227	10.45.55.227
229	10.45.55.228/32	10.45.55.228 – 10.45.55.228	10.45.55.228
230	10.45.55.229/32	10.45.55.229 – 10.45.55.229	10.45.55.229
231	10.45.55.230/32	10.45.55.230 – 10.45.55.230	10.45.55.230
232	10.45.55.231/32	10.45.55.231 – 10.45.55.231	10.45.55.231
233	10.45.55.232/32	10.45.55.232 – 10.45.55.232	10.45.55.232
234	10.45.55.233/32	10.45.55.233 – 10.45.55.233	10.45.55.233
235	10.45.55.234/32	10.45.55.234 – 10.45.55.234	10.45.55.234
236	10.45.55.235/32	10.45.55.235 – 10.45.55.235	10.45.55.235
237	10.45.55.236/32	10.45.55.236 – 10.45.55.236	10.45.55.236
238	10.45.55.237/32	10.45.55.237 – 10.45.55.237	10.45.55.237
239	10.45.55.238/32	10.45.55.238 – 10.45.55.238	10.45.55.238
240	10.45.55.239/32	10.45.55.239 – 10.45.55.239	10.45.55.239
241	10.45.55.240/32	10.45.55.240 – 10.45.55.240	10.45.55.240
242	10.45.55.241/32	10.45.55.241 – 10.45.55.241	10.45.55.241
243	10.45.55.242/32	10.45.55.242 – 10.45.55.242	10.45.55.242
244	10.45.55.243/32	10.45.55.243 – 10.45.55.243	10.45.55.243
245	10.45.55.244/32	10.45.55.244 – 10.45.55.244	10.45.55.244
246	10.45.55.245/32	10.45.55.245 – 10.45.55.245	10.45.55.245
247	10.45.55.246/32	10.45.55.246 – 10.45.55.246	10.45.55.246
248	10.45.55.247/32	10.45.55.247 – 10.45.55.247	10.45.55.247
249	10.45.55.248/32	10.45.55.248 – 10.45.55.248	10.45.55.248
250	10.45.55.249/32	10.45.55.249 – 10.45.55.249	10.45.55.249
251	10.45.55.250/32	10.45.55.250 – 10.45.55.250	10.45.55.250
252	10.45.55.251/32	10.45.55.251 – 10.45.55.251	10.45.55.251
253	10.45.55.252/32	10.45.55.252 – 10.45.55.252	10.45.55.252
254	10.45.55.253/32	10.45.55.253 – 10.45.55.253	10.45.55.253
255	10.45.55.254/32	10.45.55.254 – 10.45.55.254	10.45.55.254
256	10.45.55.255/32	10.45.55.255 – 10.45.55.255	10.45.55.255

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 →