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)10.91.7.0/24

network10.91.7.0/24

broadcast10.91.7.255

first host10.91.7.1

last host10.91.7.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.7.0/24

address00001010.01011011.00000111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.00000111.00000000

broadcast00001010.01011011.00000111.11111111

green = network part, grey = host part

hex0x0a5b0700

decimal173737728

reverse dns0.7.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:700

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.91.7.0/32	10.91.7.0 – 10.91.7.0	10.91.7.0
2	10.91.7.1/32	10.91.7.1 – 10.91.7.1	10.91.7.1
3	10.91.7.2/32	10.91.7.2 – 10.91.7.2	10.91.7.2
4	10.91.7.3/32	10.91.7.3 – 10.91.7.3	10.91.7.3
5	10.91.7.4/32	10.91.7.4 – 10.91.7.4	10.91.7.4
6	10.91.7.5/32	10.91.7.5 – 10.91.7.5	10.91.7.5
7	10.91.7.6/32	10.91.7.6 – 10.91.7.6	10.91.7.6
8	10.91.7.7/32	10.91.7.7 – 10.91.7.7	10.91.7.7
9	10.91.7.8/32	10.91.7.8 – 10.91.7.8	10.91.7.8
10	10.91.7.9/32	10.91.7.9 – 10.91.7.9	10.91.7.9
11	10.91.7.10/32	10.91.7.10 – 10.91.7.10	10.91.7.10
12	10.91.7.11/32	10.91.7.11 – 10.91.7.11	10.91.7.11
13	10.91.7.12/32	10.91.7.12 – 10.91.7.12	10.91.7.12
14	10.91.7.13/32	10.91.7.13 – 10.91.7.13	10.91.7.13
15	10.91.7.14/32	10.91.7.14 – 10.91.7.14	10.91.7.14
16	10.91.7.15/32	10.91.7.15 – 10.91.7.15	10.91.7.15
17	10.91.7.16/32	10.91.7.16 – 10.91.7.16	10.91.7.16
18	10.91.7.17/32	10.91.7.17 – 10.91.7.17	10.91.7.17
19	10.91.7.18/32	10.91.7.18 – 10.91.7.18	10.91.7.18
20	10.91.7.19/32	10.91.7.19 – 10.91.7.19	10.91.7.19
21	10.91.7.20/32	10.91.7.20 – 10.91.7.20	10.91.7.20
22	10.91.7.21/32	10.91.7.21 – 10.91.7.21	10.91.7.21
23	10.91.7.22/32	10.91.7.22 – 10.91.7.22	10.91.7.22
24	10.91.7.23/32	10.91.7.23 – 10.91.7.23	10.91.7.23
25	10.91.7.24/32	10.91.7.24 – 10.91.7.24	10.91.7.24
26	10.91.7.25/32	10.91.7.25 – 10.91.7.25	10.91.7.25
27	10.91.7.26/32	10.91.7.26 – 10.91.7.26	10.91.7.26
28	10.91.7.27/32	10.91.7.27 – 10.91.7.27	10.91.7.27
29	10.91.7.28/32	10.91.7.28 – 10.91.7.28	10.91.7.28
30	10.91.7.29/32	10.91.7.29 – 10.91.7.29	10.91.7.29
31	10.91.7.30/32	10.91.7.30 – 10.91.7.30	10.91.7.30
32	10.91.7.31/32	10.91.7.31 – 10.91.7.31	10.91.7.31
33	10.91.7.32/32	10.91.7.32 – 10.91.7.32	10.91.7.32
34	10.91.7.33/32	10.91.7.33 – 10.91.7.33	10.91.7.33
35	10.91.7.34/32	10.91.7.34 – 10.91.7.34	10.91.7.34
36	10.91.7.35/32	10.91.7.35 – 10.91.7.35	10.91.7.35
37	10.91.7.36/32	10.91.7.36 – 10.91.7.36	10.91.7.36
38	10.91.7.37/32	10.91.7.37 – 10.91.7.37	10.91.7.37
39	10.91.7.38/32	10.91.7.38 – 10.91.7.38	10.91.7.38
40	10.91.7.39/32	10.91.7.39 – 10.91.7.39	10.91.7.39
41	10.91.7.40/32	10.91.7.40 – 10.91.7.40	10.91.7.40
42	10.91.7.41/32	10.91.7.41 – 10.91.7.41	10.91.7.41
43	10.91.7.42/32	10.91.7.42 – 10.91.7.42	10.91.7.42
44	10.91.7.43/32	10.91.7.43 – 10.91.7.43	10.91.7.43
45	10.91.7.44/32	10.91.7.44 – 10.91.7.44	10.91.7.44
46	10.91.7.45/32	10.91.7.45 – 10.91.7.45	10.91.7.45
47	10.91.7.46/32	10.91.7.46 – 10.91.7.46	10.91.7.46
48	10.91.7.47/32	10.91.7.47 – 10.91.7.47	10.91.7.47
49	10.91.7.48/32	10.91.7.48 – 10.91.7.48	10.91.7.48
50	10.91.7.49/32	10.91.7.49 – 10.91.7.49	10.91.7.49
51	10.91.7.50/32	10.91.7.50 – 10.91.7.50	10.91.7.50
52	10.91.7.51/32	10.91.7.51 – 10.91.7.51	10.91.7.51
53	10.91.7.52/32	10.91.7.52 – 10.91.7.52	10.91.7.52
54	10.91.7.53/32	10.91.7.53 – 10.91.7.53	10.91.7.53
55	10.91.7.54/32	10.91.7.54 – 10.91.7.54	10.91.7.54
56	10.91.7.55/32	10.91.7.55 – 10.91.7.55	10.91.7.55
57	10.91.7.56/32	10.91.7.56 – 10.91.7.56	10.91.7.56
58	10.91.7.57/32	10.91.7.57 – 10.91.7.57	10.91.7.57
59	10.91.7.58/32	10.91.7.58 – 10.91.7.58	10.91.7.58
60	10.91.7.59/32	10.91.7.59 – 10.91.7.59	10.91.7.59
61	10.91.7.60/32	10.91.7.60 – 10.91.7.60	10.91.7.60
62	10.91.7.61/32	10.91.7.61 – 10.91.7.61	10.91.7.61
63	10.91.7.62/32	10.91.7.62 – 10.91.7.62	10.91.7.62
64	10.91.7.63/32	10.91.7.63 – 10.91.7.63	10.91.7.63
65	10.91.7.64/32	10.91.7.64 – 10.91.7.64	10.91.7.64
66	10.91.7.65/32	10.91.7.65 – 10.91.7.65	10.91.7.65
67	10.91.7.66/32	10.91.7.66 – 10.91.7.66	10.91.7.66
68	10.91.7.67/32	10.91.7.67 – 10.91.7.67	10.91.7.67
69	10.91.7.68/32	10.91.7.68 – 10.91.7.68	10.91.7.68
70	10.91.7.69/32	10.91.7.69 – 10.91.7.69	10.91.7.69
71	10.91.7.70/32	10.91.7.70 – 10.91.7.70	10.91.7.70
72	10.91.7.71/32	10.91.7.71 – 10.91.7.71	10.91.7.71
73	10.91.7.72/32	10.91.7.72 – 10.91.7.72	10.91.7.72
74	10.91.7.73/32	10.91.7.73 – 10.91.7.73	10.91.7.73
75	10.91.7.74/32	10.91.7.74 – 10.91.7.74	10.91.7.74
76	10.91.7.75/32	10.91.7.75 – 10.91.7.75	10.91.7.75
77	10.91.7.76/32	10.91.7.76 – 10.91.7.76	10.91.7.76
78	10.91.7.77/32	10.91.7.77 – 10.91.7.77	10.91.7.77
79	10.91.7.78/32	10.91.7.78 – 10.91.7.78	10.91.7.78
80	10.91.7.79/32	10.91.7.79 – 10.91.7.79	10.91.7.79
81	10.91.7.80/32	10.91.7.80 – 10.91.7.80	10.91.7.80
82	10.91.7.81/32	10.91.7.81 – 10.91.7.81	10.91.7.81
83	10.91.7.82/32	10.91.7.82 – 10.91.7.82	10.91.7.82
84	10.91.7.83/32	10.91.7.83 – 10.91.7.83	10.91.7.83
85	10.91.7.84/32	10.91.7.84 – 10.91.7.84	10.91.7.84
86	10.91.7.85/32	10.91.7.85 – 10.91.7.85	10.91.7.85
87	10.91.7.86/32	10.91.7.86 – 10.91.7.86	10.91.7.86
88	10.91.7.87/32	10.91.7.87 – 10.91.7.87	10.91.7.87
89	10.91.7.88/32	10.91.7.88 – 10.91.7.88	10.91.7.88
90	10.91.7.89/32	10.91.7.89 – 10.91.7.89	10.91.7.89
91	10.91.7.90/32	10.91.7.90 – 10.91.7.90	10.91.7.90
92	10.91.7.91/32	10.91.7.91 – 10.91.7.91	10.91.7.91
93	10.91.7.92/32	10.91.7.92 – 10.91.7.92	10.91.7.92
94	10.91.7.93/32	10.91.7.93 – 10.91.7.93	10.91.7.93
95	10.91.7.94/32	10.91.7.94 – 10.91.7.94	10.91.7.94
96	10.91.7.95/32	10.91.7.95 – 10.91.7.95	10.91.7.95
97	10.91.7.96/32	10.91.7.96 – 10.91.7.96	10.91.7.96
98	10.91.7.97/32	10.91.7.97 – 10.91.7.97	10.91.7.97
99	10.91.7.98/32	10.91.7.98 – 10.91.7.98	10.91.7.98
100	10.91.7.99/32	10.91.7.99 – 10.91.7.99	10.91.7.99
101	10.91.7.100/32	10.91.7.100 – 10.91.7.100	10.91.7.100
102	10.91.7.101/32	10.91.7.101 – 10.91.7.101	10.91.7.101
103	10.91.7.102/32	10.91.7.102 – 10.91.7.102	10.91.7.102
104	10.91.7.103/32	10.91.7.103 – 10.91.7.103	10.91.7.103
105	10.91.7.104/32	10.91.7.104 – 10.91.7.104	10.91.7.104
106	10.91.7.105/32	10.91.7.105 – 10.91.7.105	10.91.7.105
107	10.91.7.106/32	10.91.7.106 – 10.91.7.106	10.91.7.106
108	10.91.7.107/32	10.91.7.107 – 10.91.7.107	10.91.7.107
109	10.91.7.108/32	10.91.7.108 – 10.91.7.108	10.91.7.108
110	10.91.7.109/32	10.91.7.109 – 10.91.7.109	10.91.7.109
111	10.91.7.110/32	10.91.7.110 – 10.91.7.110	10.91.7.110
112	10.91.7.111/32	10.91.7.111 – 10.91.7.111	10.91.7.111
113	10.91.7.112/32	10.91.7.112 – 10.91.7.112	10.91.7.112
114	10.91.7.113/32	10.91.7.113 – 10.91.7.113	10.91.7.113
115	10.91.7.114/32	10.91.7.114 – 10.91.7.114	10.91.7.114
116	10.91.7.115/32	10.91.7.115 – 10.91.7.115	10.91.7.115
117	10.91.7.116/32	10.91.7.116 – 10.91.7.116	10.91.7.116
118	10.91.7.117/32	10.91.7.117 – 10.91.7.117	10.91.7.117
119	10.91.7.118/32	10.91.7.118 – 10.91.7.118	10.91.7.118
120	10.91.7.119/32	10.91.7.119 – 10.91.7.119	10.91.7.119
121	10.91.7.120/32	10.91.7.120 – 10.91.7.120	10.91.7.120
122	10.91.7.121/32	10.91.7.121 – 10.91.7.121	10.91.7.121
123	10.91.7.122/32	10.91.7.122 – 10.91.7.122	10.91.7.122
124	10.91.7.123/32	10.91.7.123 – 10.91.7.123	10.91.7.123
125	10.91.7.124/32	10.91.7.124 – 10.91.7.124	10.91.7.124
126	10.91.7.125/32	10.91.7.125 – 10.91.7.125	10.91.7.125
127	10.91.7.126/32	10.91.7.126 – 10.91.7.126	10.91.7.126
128	10.91.7.127/32	10.91.7.127 – 10.91.7.127	10.91.7.127
129	10.91.7.128/32	10.91.7.128 – 10.91.7.128	10.91.7.128
130	10.91.7.129/32	10.91.7.129 – 10.91.7.129	10.91.7.129
131	10.91.7.130/32	10.91.7.130 – 10.91.7.130	10.91.7.130
132	10.91.7.131/32	10.91.7.131 – 10.91.7.131	10.91.7.131
133	10.91.7.132/32	10.91.7.132 – 10.91.7.132	10.91.7.132
134	10.91.7.133/32	10.91.7.133 – 10.91.7.133	10.91.7.133
135	10.91.7.134/32	10.91.7.134 – 10.91.7.134	10.91.7.134
136	10.91.7.135/32	10.91.7.135 – 10.91.7.135	10.91.7.135
137	10.91.7.136/32	10.91.7.136 – 10.91.7.136	10.91.7.136
138	10.91.7.137/32	10.91.7.137 – 10.91.7.137	10.91.7.137
139	10.91.7.138/32	10.91.7.138 – 10.91.7.138	10.91.7.138
140	10.91.7.139/32	10.91.7.139 – 10.91.7.139	10.91.7.139
141	10.91.7.140/32	10.91.7.140 – 10.91.7.140	10.91.7.140
142	10.91.7.141/32	10.91.7.141 – 10.91.7.141	10.91.7.141
143	10.91.7.142/32	10.91.7.142 – 10.91.7.142	10.91.7.142
144	10.91.7.143/32	10.91.7.143 – 10.91.7.143	10.91.7.143
145	10.91.7.144/32	10.91.7.144 – 10.91.7.144	10.91.7.144
146	10.91.7.145/32	10.91.7.145 – 10.91.7.145	10.91.7.145
147	10.91.7.146/32	10.91.7.146 – 10.91.7.146	10.91.7.146
148	10.91.7.147/32	10.91.7.147 – 10.91.7.147	10.91.7.147
149	10.91.7.148/32	10.91.7.148 – 10.91.7.148	10.91.7.148
150	10.91.7.149/32	10.91.7.149 – 10.91.7.149	10.91.7.149
151	10.91.7.150/32	10.91.7.150 – 10.91.7.150	10.91.7.150
152	10.91.7.151/32	10.91.7.151 – 10.91.7.151	10.91.7.151
153	10.91.7.152/32	10.91.7.152 – 10.91.7.152	10.91.7.152
154	10.91.7.153/32	10.91.7.153 – 10.91.7.153	10.91.7.153
155	10.91.7.154/32	10.91.7.154 – 10.91.7.154	10.91.7.154
156	10.91.7.155/32	10.91.7.155 – 10.91.7.155	10.91.7.155
157	10.91.7.156/32	10.91.7.156 – 10.91.7.156	10.91.7.156
158	10.91.7.157/32	10.91.7.157 – 10.91.7.157	10.91.7.157
159	10.91.7.158/32	10.91.7.158 – 10.91.7.158	10.91.7.158
160	10.91.7.159/32	10.91.7.159 – 10.91.7.159	10.91.7.159
161	10.91.7.160/32	10.91.7.160 – 10.91.7.160	10.91.7.160
162	10.91.7.161/32	10.91.7.161 – 10.91.7.161	10.91.7.161
163	10.91.7.162/32	10.91.7.162 – 10.91.7.162	10.91.7.162
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165	10.91.7.164/32	10.91.7.164 – 10.91.7.164	10.91.7.164
166	10.91.7.165/32	10.91.7.165 – 10.91.7.165	10.91.7.165
167	10.91.7.166/32	10.91.7.166 – 10.91.7.166	10.91.7.166
168	10.91.7.167/32	10.91.7.167 – 10.91.7.167	10.91.7.167
169	10.91.7.168/32	10.91.7.168 – 10.91.7.168	10.91.7.168
170	10.91.7.169/32	10.91.7.169 – 10.91.7.169	10.91.7.169
171	10.91.7.170/32	10.91.7.170 – 10.91.7.170	10.91.7.170
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210	10.91.7.209/32	10.91.7.209 – 10.91.7.209	10.91.7.209
211	10.91.7.210/32	10.91.7.210 – 10.91.7.210	10.91.7.210
212	10.91.7.211/32	10.91.7.211 – 10.91.7.211	10.91.7.211
213	10.91.7.212/32	10.91.7.212 – 10.91.7.212	10.91.7.212
214	10.91.7.213/32	10.91.7.213 – 10.91.7.213	10.91.7.213
215	10.91.7.214/32	10.91.7.214 – 10.91.7.214	10.91.7.214
216	10.91.7.215/32	10.91.7.215 – 10.91.7.215	10.91.7.215
217	10.91.7.216/32	10.91.7.216 – 10.91.7.216	10.91.7.216
218	10.91.7.217/32	10.91.7.217 – 10.91.7.217	10.91.7.217
219	10.91.7.218/32	10.91.7.218 – 10.91.7.218	10.91.7.218
220	10.91.7.219/32	10.91.7.219 – 10.91.7.219	10.91.7.219
221	10.91.7.220/32	10.91.7.220 – 10.91.7.220	10.91.7.220
222	10.91.7.221/32	10.91.7.221 – 10.91.7.221	10.91.7.221
223	10.91.7.222/32	10.91.7.222 – 10.91.7.222	10.91.7.222
224	10.91.7.223/32	10.91.7.223 – 10.91.7.223	10.91.7.223
225	10.91.7.224/32	10.91.7.224 – 10.91.7.224	10.91.7.224
226	10.91.7.225/32	10.91.7.225 – 10.91.7.225	10.91.7.225
227	10.91.7.226/32	10.91.7.226 – 10.91.7.226	10.91.7.226
228	10.91.7.227/32	10.91.7.227 – 10.91.7.227	10.91.7.227
229	10.91.7.228/32	10.91.7.228 – 10.91.7.228	10.91.7.228
230	10.91.7.229/32	10.91.7.229 – 10.91.7.229	10.91.7.229
231	10.91.7.230/32	10.91.7.230 – 10.91.7.230	10.91.7.230
232	10.91.7.231/32	10.91.7.231 – 10.91.7.231	10.91.7.231
233	10.91.7.232/32	10.91.7.232 – 10.91.7.232	10.91.7.232
234	10.91.7.233/32	10.91.7.233 – 10.91.7.233	10.91.7.233
235	10.91.7.234/32	10.91.7.234 – 10.91.7.234	10.91.7.234
236	10.91.7.235/32	10.91.7.235 – 10.91.7.235	10.91.7.235
237	10.91.7.236/32	10.91.7.236 – 10.91.7.236	10.91.7.236
238	10.91.7.237/32	10.91.7.237 – 10.91.7.237	10.91.7.237
239	10.91.7.238/32	10.91.7.238 – 10.91.7.238	10.91.7.238
240	10.91.7.239/32	10.91.7.239 – 10.91.7.239	10.91.7.239
241	10.91.7.240/32	10.91.7.240 – 10.91.7.240	10.91.7.240
242	10.91.7.241/32	10.91.7.241 – 10.91.7.241	10.91.7.241
243	10.91.7.242/32	10.91.7.242 – 10.91.7.242	10.91.7.242
244	10.91.7.243/32	10.91.7.243 – 10.91.7.243	10.91.7.243
245	10.91.7.244/32	10.91.7.244 – 10.91.7.244	10.91.7.244
246	10.91.7.245/32	10.91.7.245 – 10.91.7.245	10.91.7.245
247	10.91.7.246/32	10.91.7.246 – 10.91.7.246	10.91.7.246
248	10.91.7.247/32	10.91.7.247 – 10.91.7.247	10.91.7.247
249	10.91.7.248/32	10.91.7.248 – 10.91.7.248	10.91.7.248
250	10.91.7.249/32	10.91.7.249 – 10.91.7.249	10.91.7.249
251	10.91.7.250/32	10.91.7.250 – 10.91.7.250	10.91.7.250
252	10.91.7.251/32	10.91.7.251 – 10.91.7.251	10.91.7.251
253	10.91.7.252/32	10.91.7.252 – 10.91.7.252	10.91.7.252
254	10.91.7.253/32	10.91.7.253 – 10.91.7.253	10.91.7.253
255	10.91.7.254/32	10.91.7.254 – 10.91.7.254	10.91.7.254
256	10.91.7.255/32	10.91.7.255 – 10.91.7.255	10.91.7.255

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 →