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)10.45.37.0/24

network10.45.37.0/24

broadcast10.45.37.255

first host10.45.37.1

last host10.45.37.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.45.37.0/24

address00001010.00101101.00100101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00101101.00100101.00000000

broadcast00001010.00101101.00100101.11111111

green = network part, grey = host part

hex0x0a2d2500

decimal170730752

reverse dns0.37.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:2500

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.45.37.0/32	10.45.37.0 – 10.45.37.0	10.45.37.0
2	10.45.37.1/32	10.45.37.1 – 10.45.37.1	10.45.37.1
3	10.45.37.2/32	10.45.37.2 – 10.45.37.2	10.45.37.2
4	10.45.37.3/32	10.45.37.3 – 10.45.37.3	10.45.37.3
5	10.45.37.4/32	10.45.37.4 – 10.45.37.4	10.45.37.4
6	10.45.37.5/32	10.45.37.5 – 10.45.37.5	10.45.37.5
7	10.45.37.6/32	10.45.37.6 – 10.45.37.6	10.45.37.6
8	10.45.37.7/32	10.45.37.7 – 10.45.37.7	10.45.37.7
9	10.45.37.8/32	10.45.37.8 – 10.45.37.8	10.45.37.8
10	10.45.37.9/32	10.45.37.9 – 10.45.37.9	10.45.37.9
11	10.45.37.10/32	10.45.37.10 – 10.45.37.10	10.45.37.10
12	10.45.37.11/32	10.45.37.11 – 10.45.37.11	10.45.37.11
13	10.45.37.12/32	10.45.37.12 – 10.45.37.12	10.45.37.12
14	10.45.37.13/32	10.45.37.13 – 10.45.37.13	10.45.37.13
15	10.45.37.14/32	10.45.37.14 – 10.45.37.14	10.45.37.14
16	10.45.37.15/32	10.45.37.15 – 10.45.37.15	10.45.37.15
17	10.45.37.16/32	10.45.37.16 – 10.45.37.16	10.45.37.16
18	10.45.37.17/32	10.45.37.17 – 10.45.37.17	10.45.37.17
19	10.45.37.18/32	10.45.37.18 – 10.45.37.18	10.45.37.18
20	10.45.37.19/32	10.45.37.19 – 10.45.37.19	10.45.37.19
21	10.45.37.20/32	10.45.37.20 – 10.45.37.20	10.45.37.20
22	10.45.37.21/32	10.45.37.21 – 10.45.37.21	10.45.37.21
23	10.45.37.22/32	10.45.37.22 – 10.45.37.22	10.45.37.22
24	10.45.37.23/32	10.45.37.23 – 10.45.37.23	10.45.37.23
25	10.45.37.24/32	10.45.37.24 – 10.45.37.24	10.45.37.24
26	10.45.37.25/32	10.45.37.25 – 10.45.37.25	10.45.37.25
27	10.45.37.26/32	10.45.37.26 – 10.45.37.26	10.45.37.26
28	10.45.37.27/32	10.45.37.27 – 10.45.37.27	10.45.37.27
29	10.45.37.28/32	10.45.37.28 – 10.45.37.28	10.45.37.28
30	10.45.37.29/32	10.45.37.29 – 10.45.37.29	10.45.37.29
31	10.45.37.30/32	10.45.37.30 – 10.45.37.30	10.45.37.30
32	10.45.37.31/32	10.45.37.31 – 10.45.37.31	10.45.37.31
33	10.45.37.32/32	10.45.37.32 – 10.45.37.32	10.45.37.32
34	10.45.37.33/32	10.45.37.33 – 10.45.37.33	10.45.37.33
35	10.45.37.34/32	10.45.37.34 – 10.45.37.34	10.45.37.34
36	10.45.37.35/32	10.45.37.35 – 10.45.37.35	10.45.37.35
37	10.45.37.36/32	10.45.37.36 – 10.45.37.36	10.45.37.36
38	10.45.37.37/32	10.45.37.37 – 10.45.37.37	10.45.37.37
39	10.45.37.38/32	10.45.37.38 – 10.45.37.38	10.45.37.38
40	10.45.37.39/32	10.45.37.39 – 10.45.37.39	10.45.37.39
41	10.45.37.40/32	10.45.37.40 – 10.45.37.40	10.45.37.40
42	10.45.37.41/32	10.45.37.41 – 10.45.37.41	10.45.37.41
43	10.45.37.42/32	10.45.37.42 – 10.45.37.42	10.45.37.42
44	10.45.37.43/32	10.45.37.43 – 10.45.37.43	10.45.37.43
45	10.45.37.44/32	10.45.37.44 – 10.45.37.44	10.45.37.44
46	10.45.37.45/32	10.45.37.45 – 10.45.37.45	10.45.37.45
47	10.45.37.46/32	10.45.37.46 – 10.45.37.46	10.45.37.46
48	10.45.37.47/32	10.45.37.47 – 10.45.37.47	10.45.37.47
49	10.45.37.48/32	10.45.37.48 – 10.45.37.48	10.45.37.48
50	10.45.37.49/32	10.45.37.49 – 10.45.37.49	10.45.37.49
51	10.45.37.50/32	10.45.37.50 – 10.45.37.50	10.45.37.50
52	10.45.37.51/32	10.45.37.51 – 10.45.37.51	10.45.37.51
53	10.45.37.52/32	10.45.37.52 – 10.45.37.52	10.45.37.52
54	10.45.37.53/32	10.45.37.53 – 10.45.37.53	10.45.37.53
55	10.45.37.54/32	10.45.37.54 – 10.45.37.54	10.45.37.54
56	10.45.37.55/32	10.45.37.55 – 10.45.37.55	10.45.37.55
57	10.45.37.56/32	10.45.37.56 – 10.45.37.56	10.45.37.56
58	10.45.37.57/32	10.45.37.57 – 10.45.37.57	10.45.37.57
59	10.45.37.58/32	10.45.37.58 – 10.45.37.58	10.45.37.58
60	10.45.37.59/32	10.45.37.59 – 10.45.37.59	10.45.37.59
61	10.45.37.60/32	10.45.37.60 – 10.45.37.60	10.45.37.60
62	10.45.37.61/32	10.45.37.61 – 10.45.37.61	10.45.37.61
63	10.45.37.62/32	10.45.37.62 – 10.45.37.62	10.45.37.62
64	10.45.37.63/32	10.45.37.63 – 10.45.37.63	10.45.37.63
65	10.45.37.64/32	10.45.37.64 – 10.45.37.64	10.45.37.64
66	10.45.37.65/32	10.45.37.65 – 10.45.37.65	10.45.37.65
67	10.45.37.66/32	10.45.37.66 – 10.45.37.66	10.45.37.66
68	10.45.37.67/32	10.45.37.67 – 10.45.37.67	10.45.37.67
69	10.45.37.68/32	10.45.37.68 – 10.45.37.68	10.45.37.68
70	10.45.37.69/32	10.45.37.69 – 10.45.37.69	10.45.37.69
71	10.45.37.70/32	10.45.37.70 – 10.45.37.70	10.45.37.70
72	10.45.37.71/32	10.45.37.71 – 10.45.37.71	10.45.37.71
73	10.45.37.72/32	10.45.37.72 – 10.45.37.72	10.45.37.72
74	10.45.37.73/32	10.45.37.73 – 10.45.37.73	10.45.37.73
75	10.45.37.74/32	10.45.37.74 – 10.45.37.74	10.45.37.74
76	10.45.37.75/32	10.45.37.75 – 10.45.37.75	10.45.37.75
77	10.45.37.76/32	10.45.37.76 – 10.45.37.76	10.45.37.76
78	10.45.37.77/32	10.45.37.77 – 10.45.37.77	10.45.37.77
79	10.45.37.78/32	10.45.37.78 – 10.45.37.78	10.45.37.78
80	10.45.37.79/32	10.45.37.79 – 10.45.37.79	10.45.37.79
81	10.45.37.80/32	10.45.37.80 – 10.45.37.80	10.45.37.80
82	10.45.37.81/32	10.45.37.81 – 10.45.37.81	10.45.37.81
83	10.45.37.82/32	10.45.37.82 – 10.45.37.82	10.45.37.82
84	10.45.37.83/32	10.45.37.83 – 10.45.37.83	10.45.37.83
85	10.45.37.84/32	10.45.37.84 – 10.45.37.84	10.45.37.84
86	10.45.37.85/32	10.45.37.85 – 10.45.37.85	10.45.37.85
87	10.45.37.86/32	10.45.37.86 – 10.45.37.86	10.45.37.86
88	10.45.37.87/32	10.45.37.87 – 10.45.37.87	10.45.37.87
89	10.45.37.88/32	10.45.37.88 – 10.45.37.88	10.45.37.88
90	10.45.37.89/32	10.45.37.89 – 10.45.37.89	10.45.37.89
91	10.45.37.90/32	10.45.37.90 – 10.45.37.90	10.45.37.90
92	10.45.37.91/32	10.45.37.91 – 10.45.37.91	10.45.37.91
93	10.45.37.92/32	10.45.37.92 – 10.45.37.92	10.45.37.92
94	10.45.37.93/32	10.45.37.93 – 10.45.37.93	10.45.37.93
95	10.45.37.94/32	10.45.37.94 – 10.45.37.94	10.45.37.94
96	10.45.37.95/32	10.45.37.95 – 10.45.37.95	10.45.37.95
97	10.45.37.96/32	10.45.37.96 – 10.45.37.96	10.45.37.96
98	10.45.37.97/32	10.45.37.97 – 10.45.37.97	10.45.37.97
99	10.45.37.98/32	10.45.37.98 – 10.45.37.98	10.45.37.98
100	10.45.37.99/32	10.45.37.99 – 10.45.37.99	10.45.37.99
101	10.45.37.100/32	10.45.37.100 – 10.45.37.100	10.45.37.100
102	10.45.37.101/32	10.45.37.101 – 10.45.37.101	10.45.37.101
103	10.45.37.102/32	10.45.37.102 – 10.45.37.102	10.45.37.102
104	10.45.37.103/32	10.45.37.103 – 10.45.37.103	10.45.37.103
105	10.45.37.104/32	10.45.37.104 – 10.45.37.104	10.45.37.104
106	10.45.37.105/32	10.45.37.105 – 10.45.37.105	10.45.37.105
107	10.45.37.106/32	10.45.37.106 – 10.45.37.106	10.45.37.106
108	10.45.37.107/32	10.45.37.107 – 10.45.37.107	10.45.37.107
109	10.45.37.108/32	10.45.37.108 – 10.45.37.108	10.45.37.108
110	10.45.37.109/32	10.45.37.109 – 10.45.37.109	10.45.37.109
111	10.45.37.110/32	10.45.37.110 – 10.45.37.110	10.45.37.110
112	10.45.37.111/32	10.45.37.111 – 10.45.37.111	10.45.37.111
113	10.45.37.112/32	10.45.37.112 – 10.45.37.112	10.45.37.112
114	10.45.37.113/32	10.45.37.113 – 10.45.37.113	10.45.37.113
115	10.45.37.114/32	10.45.37.114 – 10.45.37.114	10.45.37.114
116	10.45.37.115/32	10.45.37.115 – 10.45.37.115	10.45.37.115
117	10.45.37.116/32	10.45.37.116 – 10.45.37.116	10.45.37.116
118	10.45.37.117/32	10.45.37.117 – 10.45.37.117	10.45.37.117
119	10.45.37.118/32	10.45.37.118 – 10.45.37.118	10.45.37.118
120	10.45.37.119/32	10.45.37.119 – 10.45.37.119	10.45.37.119
121	10.45.37.120/32	10.45.37.120 – 10.45.37.120	10.45.37.120
122	10.45.37.121/32	10.45.37.121 – 10.45.37.121	10.45.37.121
123	10.45.37.122/32	10.45.37.122 – 10.45.37.122	10.45.37.122
124	10.45.37.123/32	10.45.37.123 – 10.45.37.123	10.45.37.123
125	10.45.37.124/32	10.45.37.124 – 10.45.37.124	10.45.37.124
126	10.45.37.125/32	10.45.37.125 – 10.45.37.125	10.45.37.125
127	10.45.37.126/32	10.45.37.126 – 10.45.37.126	10.45.37.126
128	10.45.37.127/32	10.45.37.127 – 10.45.37.127	10.45.37.127
129	10.45.37.128/32	10.45.37.128 – 10.45.37.128	10.45.37.128
130	10.45.37.129/32	10.45.37.129 – 10.45.37.129	10.45.37.129
131	10.45.37.130/32	10.45.37.130 – 10.45.37.130	10.45.37.130
132	10.45.37.131/32	10.45.37.131 – 10.45.37.131	10.45.37.131
133	10.45.37.132/32	10.45.37.132 – 10.45.37.132	10.45.37.132
134	10.45.37.133/32	10.45.37.133 – 10.45.37.133	10.45.37.133
135	10.45.37.134/32	10.45.37.134 – 10.45.37.134	10.45.37.134
136	10.45.37.135/32	10.45.37.135 – 10.45.37.135	10.45.37.135
137	10.45.37.136/32	10.45.37.136 – 10.45.37.136	10.45.37.136
138	10.45.37.137/32	10.45.37.137 – 10.45.37.137	10.45.37.137
139	10.45.37.138/32	10.45.37.138 – 10.45.37.138	10.45.37.138
140	10.45.37.139/32	10.45.37.139 – 10.45.37.139	10.45.37.139
141	10.45.37.140/32	10.45.37.140 – 10.45.37.140	10.45.37.140
142	10.45.37.141/32	10.45.37.141 – 10.45.37.141	10.45.37.141
143	10.45.37.142/32	10.45.37.142 – 10.45.37.142	10.45.37.142
144	10.45.37.143/32	10.45.37.143 – 10.45.37.143	10.45.37.143
145	10.45.37.144/32	10.45.37.144 – 10.45.37.144	10.45.37.144
146	10.45.37.145/32	10.45.37.145 – 10.45.37.145	10.45.37.145
147	10.45.37.146/32	10.45.37.146 – 10.45.37.146	10.45.37.146
148	10.45.37.147/32	10.45.37.147 – 10.45.37.147	10.45.37.147
149	10.45.37.148/32	10.45.37.148 – 10.45.37.148	10.45.37.148
150	10.45.37.149/32	10.45.37.149 – 10.45.37.149	10.45.37.149
151	10.45.37.150/32	10.45.37.150 – 10.45.37.150	10.45.37.150
152	10.45.37.151/32	10.45.37.151 – 10.45.37.151	10.45.37.151
153	10.45.37.152/32	10.45.37.152 – 10.45.37.152	10.45.37.152
154	10.45.37.153/32	10.45.37.153 – 10.45.37.153	10.45.37.153
155	10.45.37.154/32	10.45.37.154 – 10.45.37.154	10.45.37.154
156	10.45.37.155/32	10.45.37.155 – 10.45.37.155	10.45.37.155
157	10.45.37.156/32	10.45.37.156 – 10.45.37.156	10.45.37.156
158	10.45.37.157/32	10.45.37.157 – 10.45.37.157	10.45.37.157
159	10.45.37.158/32	10.45.37.158 – 10.45.37.158	10.45.37.158
160	10.45.37.159/32	10.45.37.159 – 10.45.37.159	10.45.37.159
161	10.45.37.160/32	10.45.37.160 – 10.45.37.160	10.45.37.160
162	10.45.37.161/32	10.45.37.161 – 10.45.37.161	10.45.37.161
163	10.45.37.162/32	10.45.37.162 – 10.45.37.162	10.45.37.162
164	10.45.37.163/32	10.45.37.163 – 10.45.37.163	10.45.37.163
165	10.45.37.164/32	10.45.37.164 – 10.45.37.164	10.45.37.164
166	10.45.37.165/32	10.45.37.165 – 10.45.37.165	10.45.37.165
167	10.45.37.166/32	10.45.37.166 – 10.45.37.166	10.45.37.166
168	10.45.37.167/32	10.45.37.167 – 10.45.37.167	10.45.37.167
169	10.45.37.168/32	10.45.37.168 – 10.45.37.168	10.45.37.168
170	10.45.37.169/32	10.45.37.169 – 10.45.37.169	10.45.37.169
171	10.45.37.170/32	10.45.37.170 – 10.45.37.170	10.45.37.170
172	10.45.37.171/32	10.45.37.171 – 10.45.37.171	10.45.37.171
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174	10.45.37.173/32	10.45.37.173 – 10.45.37.173	10.45.37.173
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177	10.45.37.176/32	10.45.37.176 – 10.45.37.176	10.45.37.176
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179	10.45.37.178/32	10.45.37.178 – 10.45.37.178	10.45.37.178
180	10.45.37.179/32	10.45.37.179 – 10.45.37.179	10.45.37.179
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198	10.45.37.197/32	10.45.37.197 – 10.45.37.197	10.45.37.197
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200	10.45.37.199/32	10.45.37.199 – 10.45.37.199	10.45.37.199
201	10.45.37.200/32	10.45.37.200 – 10.45.37.200	10.45.37.200
202	10.45.37.201/32	10.45.37.201 – 10.45.37.201	10.45.37.201
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207	10.45.37.206/32	10.45.37.206 – 10.45.37.206	10.45.37.206
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209	10.45.37.208/32	10.45.37.208 – 10.45.37.208	10.45.37.208
210	10.45.37.209/32	10.45.37.209 – 10.45.37.209	10.45.37.209
211	10.45.37.210/32	10.45.37.210 – 10.45.37.210	10.45.37.210
212	10.45.37.211/32	10.45.37.211 – 10.45.37.211	10.45.37.211
213	10.45.37.212/32	10.45.37.212 – 10.45.37.212	10.45.37.212
214	10.45.37.213/32	10.45.37.213 – 10.45.37.213	10.45.37.213
215	10.45.37.214/32	10.45.37.214 – 10.45.37.214	10.45.37.214
216	10.45.37.215/32	10.45.37.215 – 10.45.37.215	10.45.37.215
217	10.45.37.216/32	10.45.37.216 – 10.45.37.216	10.45.37.216
218	10.45.37.217/32	10.45.37.217 – 10.45.37.217	10.45.37.217
219	10.45.37.218/32	10.45.37.218 – 10.45.37.218	10.45.37.218
220	10.45.37.219/32	10.45.37.219 – 10.45.37.219	10.45.37.219
221	10.45.37.220/32	10.45.37.220 – 10.45.37.220	10.45.37.220
222	10.45.37.221/32	10.45.37.221 – 10.45.37.221	10.45.37.221
223	10.45.37.222/32	10.45.37.222 – 10.45.37.222	10.45.37.222
224	10.45.37.223/32	10.45.37.223 – 10.45.37.223	10.45.37.223
225	10.45.37.224/32	10.45.37.224 – 10.45.37.224	10.45.37.224
226	10.45.37.225/32	10.45.37.225 – 10.45.37.225	10.45.37.225
227	10.45.37.226/32	10.45.37.226 – 10.45.37.226	10.45.37.226
228	10.45.37.227/32	10.45.37.227 – 10.45.37.227	10.45.37.227
229	10.45.37.228/32	10.45.37.228 – 10.45.37.228	10.45.37.228
230	10.45.37.229/32	10.45.37.229 – 10.45.37.229	10.45.37.229
231	10.45.37.230/32	10.45.37.230 – 10.45.37.230	10.45.37.230
232	10.45.37.231/32	10.45.37.231 – 10.45.37.231	10.45.37.231
233	10.45.37.232/32	10.45.37.232 – 10.45.37.232	10.45.37.232
234	10.45.37.233/32	10.45.37.233 – 10.45.37.233	10.45.37.233
235	10.45.37.234/32	10.45.37.234 – 10.45.37.234	10.45.37.234
236	10.45.37.235/32	10.45.37.235 – 10.45.37.235	10.45.37.235
237	10.45.37.236/32	10.45.37.236 – 10.45.37.236	10.45.37.236
238	10.45.37.237/32	10.45.37.237 – 10.45.37.237	10.45.37.237
239	10.45.37.238/32	10.45.37.238 – 10.45.37.238	10.45.37.238
240	10.45.37.239/32	10.45.37.239 – 10.45.37.239	10.45.37.239
241	10.45.37.240/32	10.45.37.240 – 10.45.37.240	10.45.37.240
242	10.45.37.241/32	10.45.37.241 – 10.45.37.241	10.45.37.241
243	10.45.37.242/32	10.45.37.242 – 10.45.37.242	10.45.37.242
244	10.45.37.243/32	10.45.37.243 – 10.45.37.243	10.45.37.243
245	10.45.37.244/32	10.45.37.244 – 10.45.37.244	10.45.37.244
246	10.45.37.245/32	10.45.37.245 – 10.45.37.245	10.45.37.245
247	10.45.37.246/32	10.45.37.246 – 10.45.37.246	10.45.37.246
248	10.45.37.247/32	10.45.37.247 – 10.45.37.247	10.45.37.247
249	10.45.37.248/32	10.45.37.248 – 10.45.37.248	10.45.37.248
250	10.45.37.249/32	10.45.37.249 – 10.45.37.249	10.45.37.249
251	10.45.37.250/32	10.45.37.250 – 10.45.37.250	10.45.37.250
252	10.45.37.251/32	10.45.37.251 – 10.45.37.251	10.45.37.251
253	10.45.37.252/32	10.45.37.252 – 10.45.37.252	10.45.37.252
254	10.45.37.253/32	10.45.37.253 – 10.45.37.253	10.45.37.253
255	10.45.37.254/32	10.45.37.254 – 10.45.37.254	10.45.37.254
256	10.45.37.255/32	10.45.37.255 – 10.45.37.255	10.45.37.255

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 →