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)10.91.239.0/24

network10.91.239.0/24

broadcast10.91.239.255

first host10.91.239.1

last host10.91.239.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.239.0/24

address00001010.01011011.11101111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.11101111.00000000

broadcast00001010.01011011.11101111.11111111

green = network part, grey = host part

hex0x0a5bef00

decimal173797120

reverse dns0.239.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:ef00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.91.239.0/32	10.91.239.0 – 10.91.239.0	10.91.239.0
2	10.91.239.1/32	10.91.239.1 – 10.91.239.1	10.91.239.1
3	10.91.239.2/32	10.91.239.2 – 10.91.239.2	10.91.239.2
4	10.91.239.3/32	10.91.239.3 – 10.91.239.3	10.91.239.3
5	10.91.239.4/32	10.91.239.4 – 10.91.239.4	10.91.239.4
6	10.91.239.5/32	10.91.239.5 – 10.91.239.5	10.91.239.5
7	10.91.239.6/32	10.91.239.6 – 10.91.239.6	10.91.239.6
8	10.91.239.7/32	10.91.239.7 – 10.91.239.7	10.91.239.7
9	10.91.239.8/32	10.91.239.8 – 10.91.239.8	10.91.239.8
10	10.91.239.9/32	10.91.239.9 – 10.91.239.9	10.91.239.9
11	10.91.239.10/32	10.91.239.10 – 10.91.239.10	10.91.239.10
12	10.91.239.11/32	10.91.239.11 – 10.91.239.11	10.91.239.11
13	10.91.239.12/32	10.91.239.12 – 10.91.239.12	10.91.239.12
14	10.91.239.13/32	10.91.239.13 – 10.91.239.13	10.91.239.13
15	10.91.239.14/32	10.91.239.14 – 10.91.239.14	10.91.239.14
16	10.91.239.15/32	10.91.239.15 – 10.91.239.15	10.91.239.15
17	10.91.239.16/32	10.91.239.16 – 10.91.239.16	10.91.239.16
18	10.91.239.17/32	10.91.239.17 – 10.91.239.17	10.91.239.17
19	10.91.239.18/32	10.91.239.18 – 10.91.239.18	10.91.239.18
20	10.91.239.19/32	10.91.239.19 – 10.91.239.19	10.91.239.19
21	10.91.239.20/32	10.91.239.20 – 10.91.239.20	10.91.239.20
22	10.91.239.21/32	10.91.239.21 – 10.91.239.21	10.91.239.21
23	10.91.239.22/32	10.91.239.22 – 10.91.239.22	10.91.239.22
24	10.91.239.23/32	10.91.239.23 – 10.91.239.23	10.91.239.23
25	10.91.239.24/32	10.91.239.24 – 10.91.239.24	10.91.239.24
26	10.91.239.25/32	10.91.239.25 – 10.91.239.25	10.91.239.25
27	10.91.239.26/32	10.91.239.26 – 10.91.239.26	10.91.239.26
28	10.91.239.27/32	10.91.239.27 – 10.91.239.27	10.91.239.27
29	10.91.239.28/32	10.91.239.28 – 10.91.239.28	10.91.239.28
30	10.91.239.29/32	10.91.239.29 – 10.91.239.29	10.91.239.29
31	10.91.239.30/32	10.91.239.30 – 10.91.239.30	10.91.239.30
32	10.91.239.31/32	10.91.239.31 – 10.91.239.31	10.91.239.31
33	10.91.239.32/32	10.91.239.32 – 10.91.239.32	10.91.239.32
34	10.91.239.33/32	10.91.239.33 – 10.91.239.33	10.91.239.33
35	10.91.239.34/32	10.91.239.34 – 10.91.239.34	10.91.239.34
36	10.91.239.35/32	10.91.239.35 – 10.91.239.35	10.91.239.35
37	10.91.239.36/32	10.91.239.36 – 10.91.239.36	10.91.239.36
38	10.91.239.37/32	10.91.239.37 – 10.91.239.37	10.91.239.37
39	10.91.239.38/32	10.91.239.38 – 10.91.239.38	10.91.239.38
40	10.91.239.39/32	10.91.239.39 – 10.91.239.39	10.91.239.39
41	10.91.239.40/32	10.91.239.40 – 10.91.239.40	10.91.239.40
42	10.91.239.41/32	10.91.239.41 – 10.91.239.41	10.91.239.41
43	10.91.239.42/32	10.91.239.42 – 10.91.239.42	10.91.239.42
44	10.91.239.43/32	10.91.239.43 – 10.91.239.43	10.91.239.43
45	10.91.239.44/32	10.91.239.44 – 10.91.239.44	10.91.239.44
46	10.91.239.45/32	10.91.239.45 – 10.91.239.45	10.91.239.45
47	10.91.239.46/32	10.91.239.46 – 10.91.239.46	10.91.239.46
48	10.91.239.47/32	10.91.239.47 – 10.91.239.47	10.91.239.47
49	10.91.239.48/32	10.91.239.48 – 10.91.239.48	10.91.239.48
50	10.91.239.49/32	10.91.239.49 – 10.91.239.49	10.91.239.49
51	10.91.239.50/32	10.91.239.50 – 10.91.239.50	10.91.239.50
52	10.91.239.51/32	10.91.239.51 – 10.91.239.51	10.91.239.51
53	10.91.239.52/32	10.91.239.52 – 10.91.239.52	10.91.239.52
54	10.91.239.53/32	10.91.239.53 – 10.91.239.53	10.91.239.53
55	10.91.239.54/32	10.91.239.54 – 10.91.239.54	10.91.239.54
56	10.91.239.55/32	10.91.239.55 – 10.91.239.55	10.91.239.55
57	10.91.239.56/32	10.91.239.56 – 10.91.239.56	10.91.239.56
58	10.91.239.57/32	10.91.239.57 – 10.91.239.57	10.91.239.57
59	10.91.239.58/32	10.91.239.58 – 10.91.239.58	10.91.239.58
60	10.91.239.59/32	10.91.239.59 – 10.91.239.59	10.91.239.59
61	10.91.239.60/32	10.91.239.60 – 10.91.239.60	10.91.239.60
62	10.91.239.61/32	10.91.239.61 – 10.91.239.61	10.91.239.61
63	10.91.239.62/32	10.91.239.62 – 10.91.239.62	10.91.239.62
64	10.91.239.63/32	10.91.239.63 – 10.91.239.63	10.91.239.63
65	10.91.239.64/32	10.91.239.64 – 10.91.239.64	10.91.239.64
66	10.91.239.65/32	10.91.239.65 – 10.91.239.65	10.91.239.65
67	10.91.239.66/32	10.91.239.66 – 10.91.239.66	10.91.239.66
68	10.91.239.67/32	10.91.239.67 – 10.91.239.67	10.91.239.67
69	10.91.239.68/32	10.91.239.68 – 10.91.239.68	10.91.239.68
70	10.91.239.69/32	10.91.239.69 – 10.91.239.69	10.91.239.69
71	10.91.239.70/32	10.91.239.70 – 10.91.239.70	10.91.239.70
72	10.91.239.71/32	10.91.239.71 – 10.91.239.71	10.91.239.71
73	10.91.239.72/32	10.91.239.72 – 10.91.239.72	10.91.239.72
74	10.91.239.73/32	10.91.239.73 – 10.91.239.73	10.91.239.73
75	10.91.239.74/32	10.91.239.74 – 10.91.239.74	10.91.239.74
76	10.91.239.75/32	10.91.239.75 – 10.91.239.75	10.91.239.75
77	10.91.239.76/32	10.91.239.76 – 10.91.239.76	10.91.239.76
78	10.91.239.77/32	10.91.239.77 – 10.91.239.77	10.91.239.77
79	10.91.239.78/32	10.91.239.78 – 10.91.239.78	10.91.239.78
80	10.91.239.79/32	10.91.239.79 – 10.91.239.79	10.91.239.79
81	10.91.239.80/32	10.91.239.80 – 10.91.239.80	10.91.239.80
82	10.91.239.81/32	10.91.239.81 – 10.91.239.81	10.91.239.81
83	10.91.239.82/32	10.91.239.82 – 10.91.239.82	10.91.239.82
84	10.91.239.83/32	10.91.239.83 – 10.91.239.83	10.91.239.83
85	10.91.239.84/32	10.91.239.84 – 10.91.239.84	10.91.239.84
86	10.91.239.85/32	10.91.239.85 – 10.91.239.85	10.91.239.85
87	10.91.239.86/32	10.91.239.86 – 10.91.239.86	10.91.239.86
88	10.91.239.87/32	10.91.239.87 – 10.91.239.87	10.91.239.87
89	10.91.239.88/32	10.91.239.88 – 10.91.239.88	10.91.239.88
90	10.91.239.89/32	10.91.239.89 – 10.91.239.89	10.91.239.89
91	10.91.239.90/32	10.91.239.90 – 10.91.239.90	10.91.239.90
92	10.91.239.91/32	10.91.239.91 – 10.91.239.91	10.91.239.91
93	10.91.239.92/32	10.91.239.92 – 10.91.239.92	10.91.239.92
94	10.91.239.93/32	10.91.239.93 – 10.91.239.93	10.91.239.93
95	10.91.239.94/32	10.91.239.94 – 10.91.239.94	10.91.239.94
96	10.91.239.95/32	10.91.239.95 – 10.91.239.95	10.91.239.95
97	10.91.239.96/32	10.91.239.96 – 10.91.239.96	10.91.239.96
98	10.91.239.97/32	10.91.239.97 – 10.91.239.97	10.91.239.97
99	10.91.239.98/32	10.91.239.98 – 10.91.239.98	10.91.239.98
100	10.91.239.99/32	10.91.239.99 – 10.91.239.99	10.91.239.99
101	10.91.239.100/32	10.91.239.100 – 10.91.239.100	10.91.239.100
102	10.91.239.101/32	10.91.239.101 – 10.91.239.101	10.91.239.101
103	10.91.239.102/32	10.91.239.102 – 10.91.239.102	10.91.239.102
104	10.91.239.103/32	10.91.239.103 – 10.91.239.103	10.91.239.103
105	10.91.239.104/32	10.91.239.104 – 10.91.239.104	10.91.239.104
106	10.91.239.105/32	10.91.239.105 – 10.91.239.105	10.91.239.105
107	10.91.239.106/32	10.91.239.106 – 10.91.239.106	10.91.239.106
108	10.91.239.107/32	10.91.239.107 – 10.91.239.107	10.91.239.107
109	10.91.239.108/32	10.91.239.108 – 10.91.239.108	10.91.239.108
110	10.91.239.109/32	10.91.239.109 – 10.91.239.109	10.91.239.109
111	10.91.239.110/32	10.91.239.110 – 10.91.239.110	10.91.239.110
112	10.91.239.111/32	10.91.239.111 – 10.91.239.111	10.91.239.111
113	10.91.239.112/32	10.91.239.112 – 10.91.239.112	10.91.239.112
114	10.91.239.113/32	10.91.239.113 – 10.91.239.113	10.91.239.113
115	10.91.239.114/32	10.91.239.114 – 10.91.239.114	10.91.239.114
116	10.91.239.115/32	10.91.239.115 – 10.91.239.115	10.91.239.115
117	10.91.239.116/32	10.91.239.116 – 10.91.239.116	10.91.239.116
118	10.91.239.117/32	10.91.239.117 – 10.91.239.117	10.91.239.117
119	10.91.239.118/32	10.91.239.118 – 10.91.239.118	10.91.239.118
120	10.91.239.119/32	10.91.239.119 – 10.91.239.119	10.91.239.119
121	10.91.239.120/32	10.91.239.120 – 10.91.239.120	10.91.239.120
122	10.91.239.121/32	10.91.239.121 – 10.91.239.121	10.91.239.121
123	10.91.239.122/32	10.91.239.122 – 10.91.239.122	10.91.239.122
124	10.91.239.123/32	10.91.239.123 – 10.91.239.123	10.91.239.123
125	10.91.239.124/32	10.91.239.124 – 10.91.239.124	10.91.239.124
126	10.91.239.125/32	10.91.239.125 – 10.91.239.125	10.91.239.125
127	10.91.239.126/32	10.91.239.126 – 10.91.239.126	10.91.239.126
128	10.91.239.127/32	10.91.239.127 – 10.91.239.127	10.91.239.127
129	10.91.239.128/32	10.91.239.128 – 10.91.239.128	10.91.239.128
130	10.91.239.129/32	10.91.239.129 – 10.91.239.129	10.91.239.129
131	10.91.239.130/32	10.91.239.130 – 10.91.239.130	10.91.239.130
132	10.91.239.131/32	10.91.239.131 – 10.91.239.131	10.91.239.131
133	10.91.239.132/32	10.91.239.132 – 10.91.239.132	10.91.239.132
134	10.91.239.133/32	10.91.239.133 – 10.91.239.133	10.91.239.133
135	10.91.239.134/32	10.91.239.134 – 10.91.239.134	10.91.239.134
136	10.91.239.135/32	10.91.239.135 – 10.91.239.135	10.91.239.135
137	10.91.239.136/32	10.91.239.136 – 10.91.239.136	10.91.239.136
138	10.91.239.137/32	10.91.239.137 – 10.91.239.137	10.91.239.137
139	10.91.239.138/32	10.91.239.138 – 10.91.239.138	10.91.239.138
140	10.91.239.139/32	10.91.239.139 – 10.91.239.139	10.91.239.139
141	10.91.239.140/32	10.91.239.140 – 10.91.239.140	10.91.239.140
142	10.91.239.141/32	10.91.239.141 – 10.91.239.141	10.91.239.141
143	10.91.239.142/32	10.91.239.142 – 10.91.239.142	10.91.239.142
144	10.91.239.143/32	10.91.239.143 – 10.91.239.143	10.91.239.143
145	10.91.239.144/32	10.91.239.144 – 10.91.239.144	10.91.239.144
146	10.91.239.145/32	10.91.239.145 – 10.91.239.145	10.91.239.145
147	10.91.239.146/32	10.91.239.146 – 10.91.239.146	10.91.239.146
148	10.91.239.147/32	10.91.239.147 – 10.91.239.147	10.91.239.147
149	10.91.239.148/32	10.91.239.148 – 10.91.239.148	10.91.239.148
150	10.91.239.149/32	10.91.239.149 – 10.91.239.149	10.91.239.149
151	10.91.239.150/32	10.91.239.150 – 10.91.239.150	10.91.239.150
152	10.91.239.151/32	10.91.239.151 – 10.91.239.151	10.91.239.151
153	10.91.239.152/32	10.91.239.152 – 10.91.239.152	10.91.239.152
154	10.91.239.153/32	10.91.239.153 – 10.91.239.153	10.91.239.153
155	10.91.239.154/32	10.91.239.154 – 10.91.239.154	10.91.239.154
156	10.91.239.155/32	10.91.239.155 – 10.91.239.155	10.91.239.155
157	10.91.239.156/32	10.91.239.156 – 10.91.239.156	10.91.239.156
158	10.91.239.157/32	10.91.239.157 – 10.91.239.157	10.91.239.157
159	10.91.239.158/32	10.91.239.158 – 10.91.239.158	10.91.239.158
160	10.91.239.159/32	10.91.239.159 – 10.91.239.159	10.91.239.159
161	10.91.239.160/32	10.91.239.160 – 10.91.239.160	10.91.239.160
162	10.91.239.161/32	10.91.239.161 – 10.91.239.161	10.91.239.161
163	10.91.239.162/32	10.91.239.162 – 10.91.239.162	10.91.239.162
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167	10.91.239.166/32	10.91.239.166 – 10.91.239.166	10.91.239.166
168	10.91.239.167/32	10.91.239.167 – 10.91.239.167	10.91.239.167
169	10.91.239.168/32	10.91.239.168 – 10.91.239.168	10.91.239.168
170	10.91.239.169/32	10.91.239.169 – 10.91.239.169	10.91.239.169
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210	10.91.239.209/32	10.91.239.209 – 10.91.239.209	10.91.239.209
211	10.91.239.210/32	10.91.239.210 – 10.91.239.210	10.91.239.210
212	10.91.239.211/32	10.91.239.211 – 10.91.239.211	10.91.239.211
213	10.91.239.212/32	10.91.239.212 – 10.91.239.212	10.91.239.212
214	10.91.239.213/32	10.91.239.213 – 10.91.239.213	10.91.239.213
215	10.91.239.214/32	10.91.239.214 – 10.91.239.214	10.91.239.214
216	10.91.239.215/32	10.91.239.215 – 10.91.239.215	10.91.239.215
217	10.91.239.216/32	10.91.239.216 – 10.91.239.216	10.91.239.216
218	10.91.239.217/32	10.91.239.217 – 10.91.239.217	10.91.239.217
219	10.91.239.218/32	10.91.239.218 – 10.91.239.218	10.91.239.218
220	10.91.239.219/32	10.91.239.219 – 10.91.239.219	10.91.239.219
221	10.91.239.220/32	10.91.239.220 – 10.91.239.220	10.91.239.220
222	10.91.239.221/32	10.91.239.221 – 10.91.239.221	10.91.239.221
223	10.91.239.222/32	10.91.239.222 – 10.91.239.222	10.91.239.222
224	10.91.239.223/32	10.91.239.223 – 10.91.239.223	10.91.239.223
225	10.91.239.224/32	10.91.239.224 – 10.91.239.224	10.91.239.224
226	10.91.239.225/32	10.91.239.225 – 10.91.239.225	10.91.239.225
227	10.91.239.226/32	10.91.239.226 – 10.91.239.226	10.91.239.226
228	10.91.239.227/32	10.91.239.227 – 10.91.239.227	10.91.239.227
229	10.91.239.228/32	10.91.239.228 – 10.91.239.228	10.91.239.228
230	10.91.239.229/32	10.91.239.229 – 10.91.239.229	10.91.239.229
231	10.91.239.230/32	10.91.239.230 – 10.91.239.230	10.91.239.230
232	10.91.239.231/32	10.91.239.231 – 10.91.239.231	10.91.239.231
233	10.91.239.232/32	10.91.239.232 – 10.91.239.232	10.91.239.232
234	10.91.239.233/32	10.91.239.233 – 10.91.239.233	10.91.239.233
235	10.91.239.234/32	10.91.239.234 – 10.91.239.234	10.91.239.234
236	10.91.239.235/32	10.91.239.235 – 10.91.239.235	10.91.239.235
237	10.91.239.236/32	10.91.239.236 – 10.91.239.236	10.91.239.236
238	10.91.239.237/32	10.91.239.237 – 10.91.239.237	10.91.239.237
239	10.91.239.238/32	10.91.239.238 – 10.91.239.238	10.91.239.238
240	10.91.239.239/32	10.91.239.239 – 10.91.239.239	10.91.239.239
241	10.91.239.240/32	10.91.239.240 – 10.91.239.240	10.91.239.240
242	10.91.239.241/32	10.91.239.241 – 10.91.239.241	10.91.239.241
243	10.91.239.242/32	10.91.239.242 – 10.91.239.242	10.91.239.242
244	10.91.239.243/32	10.91.239.243 – 10.91.239.243	10.91.239.243
245	10.91.239.244/32	10.91.239.244 – 10.91.239.244	10.91.239.244
246	10.91.239.245/32	10.91.239.245 – 10.91.239.245	10.91.239.245
247	10.91.239.246/32	10.91.239.246 – 10.91.239.246	10.91.239.246
248	10.91.239.247/32	10.91.239.247 – 10.91.239.247	10.91.239.247
249	10.91.239.248/32	10.91.239.248 – 10.91.239.248	10.91.239.248
250	10.91.239.249/32	10.91.239.249 – 10.91.239.249	10.91.239.249
251	10.91.239.250/32	10.91.239.250 – 10.91.239.250	10.91.239.250
252	10.91.239.251/32	10.91.239.251 – 10.91.239.251	10.91.239.251
253	10.91.239.252/32	10.91.239.252 – 10.91.239.252	10.91.239.252
254	10.91.239.253/32	10.91.239.253 – 10.91.239.253	10.91.239.253
255	10.91.239.254/32	10.91.239.254 – 10.91.239.254	10.91.239.254
256	10.91.239.255/32	10.91.239.255 – 10.91.239.255	10.91.239.255

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 →