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)10.91.3.0/24

network10.91.3.0/24

broadcast10.91.3.255

first host10.91.3.1

last host10.91.3.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.3.0/24

address00001010.01011011.00000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.00000011.00000000

broadcast00001010.01011011.00000011.11111111

green = network part, grey = host part

hex0x0a5b0300

decimal173736704

reverse dns0.3.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:300

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.91.3.0/32	10.91.3.0 – 10.91.3.0	10.91.3.0
2	10.91.3.1/32	10.91.3.1 – 10.91.3.1	10.91.3.1
3	10.91.3.2/32	10.91.3.2 – 10.91.3.2	10.91.3.2
4	10.91.3.3/32	10.91.3.3 – 10.91.3.3	10.91.3.3
5	10.91.3.4/32	10.91.3.4 – 10.91.3.4	10.91.3.4
6	10.91.3.5/32	10.91.3.5 – 10.91.3.5	10.91.3.5
7	10.91.3.6/32	10.91.3.6 – 10.91.3.6	10.91.3.6
8	10.91.3.7/32	10.91.3.7 – 10.91.3.7	10.91.3.7
9	10.91.3.8/32	10.91.3.8 – 10.91.3.8	10.91.3.8
10	10.91.3.9/32	10.91.3.9 – 10.91.3.9	10.91.3.9
11	10.91.3.10/32	10.91.3.10 – 10.91.3.10	10.91.3.10
12	10.91.3.11/32	10.91.3.11 – 10.91.3.11	10.91.3.11
13	10.91.3.12/32	10.91.3.12 – 10.91.3.12	10.91.3.12
14	10.91.3.13/32	10.91.3.13 – 10.91.3.13	10.91.3.13
15	10.91.3.14/32	10.91.3.14 – 10.91.3.14	10.91.3.14
16	10.91.3.15/32	10.91.3.15 – 10.91.3.15	10.91.3.15
17	10.91.3.16/32	10.91.3.16 – 10.91.3.16	10.91.3.16
18	10.91.3.17/32	10.91.3.17 – 10.91.3.17	10.91.3.17
19	10.91.3.18/32	10.91.3.18 – 10.91.3.18	10.91.3.18
20	10.91.3.19/32	10.91.3.19 – 10.91.3.19	10.91.3.19
21	10.91.3.20/32	10.91.3.20 – 10.91.3.20	10.91.3.20
22	10.91.3.21/32	10.91.3.21 – 10.91.3.21	10.91.3.21
23	10.91.3.22/32	10.91.3.22 – 10.91.3.22	10.91.3.22
24	10.91.3.23/32	10.91.3.23 – 10.91.3.23	10.91.3.23
25	10.91.3.24/32	10.91.3.24 – 10.91.3.24	10.91.3.24
26	10.91.3.25/32	10.91.3.25 – 10.91.3.25	10.91.3.25
27	10.91.3.26/32	10.91.3.26 – 10.91.3.26	10.91.3.26
28	10.91.3.27/32	10.91.3.27 – 10.91.3.27	10.91.3.27
29	10.91.3.28/32	10.91.3.28 – 10.91.3.28	10.91.3.28
30	10.91.3.29/32	10.91.3.29 – 10.91.3.29	10.91.3.29
31	10.91.3.30/32	10.91.3.30 – 10.91.3.30	10.91.3.30
32	10.91.3.31/32	10.91.3.31 – 10.91.3.31	10.91.3.31
33	10.91.3.32/32	10.91.3.32 – 10.91.3.32	10.91.3.32
34	10.91.3.33/32	10.91.3.33 – 10.91.3.33	10.91.3.33
35	10.91.3.34/32	10.91.3.34 – 10.91.3.34	10.91.3.34
36	10.91.3.35/32	10.91.3.35 – 10.91.3.35	10.91.3.35
37	10.91.3.36/32	10.91.3.36 – 10.91.3.36	10.91.3.36
38	10.91.3.37/32	10.91.3.37 – 10.91.3.37	10.91.3.37
39	10.91.3.38/32	10.91.3.38 – 10.91.3.38	10.91.3.38
40	10.91.3.39/32	10.91.3.39 – 10.91.3.39	10.91.3.39
41	10.91.3.40/32	10.91.3.40 – 10.91.3.40	10.91.3.40
42	10.91.3.41/32	10.91.3.41 – 10.91.3.41	10.91.3.41
43	10.91.3.42/32	10.91.3.42 – 10.91.3.42	10.91.3.42
44	10.91.3.43/32	10.91.3.43 – 10.91.3.43	10.91.3.43
45	10.91.3.44/32	10.91.3.44 – 10.91.3.44	10.91.3.44
46	10.91.3.45/32	10.91.3.45 – 10.91.3.45	10.91.3.45
47	10.91.3.46/32	10.91.3.46 – 10.91.3.46	10.91.3.46
48	10.91.3.47/32	10.91.3.47 – 10.91.3.47	10.91.3.47
49	10.91.3.48/32	10.91.3.48 – 10.91.3.48	10.91.3.48
50	10.91.3.49/32	10.91.3.49 – 10.91.3.49	10.91.3.49
51	10.91.3.50/32	10.91.3.50 – 10.91.3.50	10.91.3.50
52	10.91.3.51/32	10.91.3.51 – 10.91.3.51	10.91.3.51
53	10.91.3.52/32	10.91.3.52 – 10.91.3.52	10.91.3.52
54	10.91.3.53/32	10.91.3.53 – 10.91.3.53	10.91.3.53
55	10.91.3.54/32	10.91.3.54 – 10.91.3.54	10.91.3.54
56	10.91.3.55/32	10.91.3.55 – 10.91.3.55	10.91.3.55
57	10.91.3.56/32	10.91.3.56 – 10.91.3.56	10.91.3.56
58	10.91.3.57/32	10.91.3.57 – 10.91.3.57	10.91.3.57
59	10.91.3.58/32	10.91.3.58 – 10.91.3.58	10.91.3.58
60	10.91.3.59/32	10.91.3.59 – 10.91.3.59	10.91.3.59
61	10.91.3.60/32	10.91.3.60 – 10.91.3.60	10.91.3.60
62	10.91.3.61/32	10.91.3.61 – 10.91.3.61	10.91.3.61
63	10.91.3.62/32	10.91.3.62 – 10.91.3.62	10.91.3.62
64	10.91.3.63/32	10.91.3.63 – 10.91.3.63	10.91.3.63
65	10.91.3.64/32	10.91.3.64 – 10.91.3.64	10.91.3.64
66	10.91.3.65/32	10.91.3.65 – 10.91.3.65	10.91.3.65
67	10.91.3.66/32	10.91.3.66 – 10.91.3.66	10.91.3.66
68	10.91.3.67/32	10.91.3.67 – 10.91.3.67	10.91.3.67
69	10.91.3.68/32	10.91.3.68 – 10.91.3.68	10.91.3.68
70	10.91.3.69/32	10.91.3.69 – 10.91.3.69	10.91.3.69
71	10.91.3.70/32	10.91.3.70 – 10.91.3.70	10.91.3.70
72	10.91.3.71/32	10.91.3.71 – 10.91.3.71	10.91.3.71
73	10.91.3.72/32	10.91.3.72 – 10.91.3.72	10.91.3.72
74	10.91.3.73/32	10.91.3.73 – 10.91.3.73	10.91.3.73
75	10.91.3.74/32	10.91.3.74 – 10.91.3.74	10.91.3.74
76	10.91.3.75/32	10.91.3.75 – 10.91.3.75	10.91.3.75
77	10.91.3.76/32	10.91.3.76 – 10.91.3.76	10.91.3.76
78	10.91.3.77/32	10.91.3.77 – 10.91.3.77	10.91.3.77
79	10.91.3.78/32	10.91.3.78 – 10.91.3.78	10.91.3.78
80	10.91.3.79/32	10.91.3.79 – 10.91.3.79	10.91.3.79
81	10.91.3.80/32	10.91.3.80 – 10.91.3.80	10.91.3.80
82	10.91.3.81/32	10.91.3.81 – 10.91.3.81	10.91.3.81
83	10.91.3.82/32	10.91.3.82 – 10.91.3.82	10.91.3.82
84	10.91.3.83/32	10.91.3.83 – 10.91.3.83	10.91.3.83
85	10.91.3.84/32	10.91.3.84 – 10.91.3.84	10.91.3.84
86	10.91.3.85/32	10.91.3.85 – 10.91.3.85	10.91.3.85
87	10.91.3.86/32	10.91.3.86 – 10.91.3.86	10.91.3.86
88	10.91.3.87/32	10.91.3.87 – 10.91.3.87	10.91.3.87
89	10.91.3.88/32	10.91.3.88 – 10.91.3.88	10.91.3.88
90	10.91.3.89/32	10.91.3.89 – 10.91.3.89	10.91.3.89
91	10.91.3.90/32	10.91.3.90 – 10.91.3.90	10.91.3.90
92	10.91.3.91/32	10.91.3.91 – 10.91.3.91	10.91.3.91
93	10.91.3.92/32	10.91.3.92 – 10.91.3.92	10.91.3.92
94	10.91.3.93/32	10.91.3.93 – 10.91.3.93	10.91.3.93
95	10.91.3.94/32	10.91.3.94 – 10.91.3.94	10.91.3.94
96	10.91.3.95/32	10.91.3.95 – 10.91.3.95	10.91.3.95
97	10.91.3.96/32	10.91.3.96 – 10.91.3.96	10.91.3.96
98	10.91.3.97/32	10.91.3.97 – 10.91.3.97	10.91.3.97
99	10.91.3.98/32	10.91.3.98 – 10.91.3.98	10.91.3.98
100	10.91.3.99/32	10.91.3.99 – 10.91.3.99	10.91.3.99
101	10.91.3.100/32	10.91.3.100 – 10.91.3.100	10.91.3.100
102	10.91.3.101/32	10.91.3.101 – 10.91.3.101	10.91.3.101
103	10.91.3.102/32	10.91.3.102 – 10.91.3.102	10.91.3.102
104	10.91.3.103/32	10.91.3.103 – 10.91.3.103	10.91.3.103
105	10.91.3.104/32	10.91.3.104 – 10.91.3.104	10.91.3.104
106	10.91.3.105/32	10.91.3.105 – 10.91.3.105	10.91.3.105
107	10.91.3.106/32	10.91.3.106 – 10.91.3.106	10.91.3.106
108	10.91.3.107/32	10.91.3.107 – 10.91.3.107	10.91.3.107
109	10.91.3.108/32	10.91.3.108 – 10.91.3.108	10.91.3.108
110	10.91.3.109/32	10.91.3.109 – 10.91.3.109	10.91.3.109
111	10.91.3.110/32	10.91.3.110 – 10.91.3.110	10.91.3.110
112	10.91.3.111/32	10.91.3.111 – 10.91.3.111	10.91.3.111
113	10.91.3.112/32	10.91.3.112 – 10.91.3.112	10.91.3.112
114	10.91.3.113/32	10.91.3.113 – 10.91.3.113	10.91.3.113
115	10.91.3.114/32	10.91.3.114 – 10.91.3.114	10.91.3.114
116	10.91.3.115/32	10.91.3.115 – 10.91.3.115	10.91.3.115
117	10.91.3.116/32	10.91.3.116 – 10.91.3.116	10.91.3.116
118	10.91.3.117/32	10.91.3.117 – 10.91.3.117	10.91.3.117
119	10.91.3.118/32	10.91.3.118 – 10.91.3.118	10.91.3.118
120	10.91.3.119/32	10.91.3.119 – 10.91.3.119	10.91.3.119
121	10.91.3.120/32	10.91.3.120 – 10.91.3.120	10.91.3.120
122	10.91.3.121/32	10.91.3.121 – 10.91.3.121	10.91.3.121
123	10.91.3.122/32	10.91.3.122 – 10.91.3.122	10.91.3.122
124	10.91.3.123/32	10.91.3.123 – 10.91.3.123	10.91.3.123
125	10.91.3.124/32	10.91.3.124 – 10.91.3.124	10.91.3.124
126	10.91.3.125/32	10.91.3.125 – 10.91.3.125	10.91.3.125
127	10.91.3.126/32	10.91.3.126 – 10.91.3.126	10.91.3.126
128	10.91.3.127/32	10.91.3.127 – 10.91.3.127	10.91.3.127
129	10.91.3.128/32	10.91.3.128 – 10.91.3.128	10.91.3.128
130	10.91.3.129/32	10.91.3.129 – 10.91.3.129	10.91.3.129
131	10.91.3.130/32	10.91.3.130 – 10.91.3.130	10.91.3.130
132	10.91.3.131/32	10.91.3.131 – 10.91.3.131	10.91.3.131
133	10.91.3.132/32	10.91.3.132 – 10.91.3.132	10.91.3.132
134	10.91.3.133/32	10.91.3.133 – 10.91.3.133	10.91.3.133
135	10.91.3.134/32	10.91.3.134 – 10.91.3.134	10.91.3.134
136	10.91.3.135/32	10.91.3.135 – 10.91.3.135	10.91.3.135
137	10.91.3.136/32	10.91.3.136 – 10.91.3.136	10.91.3.136
138	10.91.3.137/32	10.91.3.137 – 10.91.3.137	10.91.3.137
139	10.91.3.138/32	10.91.3.138 – 10.91.3.138	10.91.3.138
140	10.91.3.139/32	10.91.3.139 – 10.91.3.139	10.91.3.139
141	10.91.3.140/32	10.91.3.140 – 10.91.3.140	10.91.3.140
142	10.91.3.141/32	10.91.3.141 – 10.91.3.141	10.91.3.141
143	10.91.3.142/32	10.91.3.142 – 10.91.3.142	10.91.3.142
144	10.91.3.143/32	10.91.3.143 – 10.91.3.143	10.91.3.143
145	10.91.3.144/32	10.91.3.144 – 10.91.3.144	10.91.3.144
146	10.91.3.145/32	10.91.3.145 – 10.91.3.145	10.91.3.145
147	10.91.3.146/32	10.91.3.146 – 10.91.3.146	10.91.3.146
148	10.91.3.147/32	10.91.3.147 – 10.91.3.147	10.91.3.147
149	10.91.3.148/32	10.91.3.148 – 10.91.3.148	10.91.3.148
150	10.91.3.149/32	10.91.3.149 – 10.91.3.149	10.91.3.149
151	10.91.3.150/32	10.91.3.150 – 10.91.3.150	10.91.3.150
152	10.91.3.151/32	10.91.3.151 – 10.91.3.151	10.91.3.151
153	10.91.3.152/32	10.91.3.152 – 10.91.3.152	10.91.3.152
154	10.91.3.153/32	10.91.3.153 – 10.91.3.153	10.91.3.153
155	10.91.3.154/32	10.91.3.154 – 10.91.3.154	10.91.3.154
156	10.91.3.155/32	10.91.3.155 – 10.91.3.155	10.91.3.155
157	10.91.3.156/32	10.91.3.156 – 10.91.3.156	10.91.3.156
158	10.91.3.157/32	10.91.3.157 – 10.91.3.157	10.91.3.157
159	10.91.3.158/32	10.91.3.158 – 10.91.3.158	10.91.3.158
160	10.91.3.159/32	10.91.3.159 – 10.91.3.159	10.91.3.159
161	10.91.3.160/32	10.91.3.160 – 10.91.3.160	10.91.3.160
162	10.91.3.161/32	10.91.3.161 – 10.91.3.161	10.91.3.161
163	10.91.3.162/32	10.91.3.162 – 10.91.3.162	10.91.3.162
164	10.91.3.163/32	10.91.3.163 – 10.91.3.163	10.91.3.163
165	10.91.3.164/32	10.91.3.164 – 10.91.3.164	10.91.3.164
166	10.91.3.165/32	10.91.3.165 – 10.91.3.165	10.91.3.165
167	10.91.3.166/32	10.91.3.166 – 10.91.3.166	10.91.3.166
168	10.91.3.167/32	10.91.3.167 – 10.91.3.167	10.91.3.167
169	10.91.3.168/32	10.91.3.168 – 10.91.3.168	10.91.3.168
170	10.91.3.169/32	10.91.3.169 – 10.91.3.169	10.91.3.169
171	10.91.3.170/32	10.91.3.170 – 10.91.3.170	10.91.3.170
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210	10.91.3.209/32	10.91.3.209 – 10.91.3.209	10.91.3.209
211	10.91.3.210/32	10.91.3.210 – 10.91.3.210	10.91.3.210
212	10.91.3.211/32	10.91.3.211 – 10.91.3.211	10.91.3.211
213	10.91.3.212/32	10.91.3.212 – 10.91.3.212	10.91.3.212
214	10.91.3.213/32	10.91.3.213 – 10.91.3.213	10.91.3.213
215	10.91.3.214/32	10.91.3.214 – 10.91.3.214	10.91.3.214
216	10.91.3.215/32	10.91.3.215 – 10.91.3.215	10.91.3.215
217	10.91.3.216/32	10.91.3.216 – 10.91.3.216	10.91.3.216
218	10.91.3.217/32	10.91.3.217 – 10.91.3.217	10.91.3.217
219	10.91.3.218/32	10.91.3.218 – 10.91.3.218	10.91.3.218
220	10.91.3.219/32	10.91.3.219 – 10.91.3.219	10.91.3.219
221	10.91.3.220/32	10.91.3.220 – 10.91.3.220	10.91.3.220
222	10.91.3.221/32	10.91.3.221 – 10.91.3.221	10.91.3.221
223	10.91.3.222/32	10.91.3.222 – 10.91.3.222	10.91.3.222
224	10.91.3.223/32	10.91.3.223 – 10.91.3.223	10.91.3.223
225	10.91.3.224/32	10.91.3.224 – 10.91.3.224	10.91.3.224
226	10.91.3.225/32	10.91.3.225 – 10.91.3.225	10.91.3.225
227	10.91.3.226/32	10.91.3.226 – 10.91.3.226	10.91.3.226
228	10.91.3.227/32	10.91.3.227 – 10.91.3.227	10.91.3.227
229	10.91.3.228/32	10.91.3.228 – 10.91.3.228	10.91.3.228
230	10.91.3.229/32	10.91.3.229 – 10.91.3.229	10.91.3.229
231	10.91.3.230/32	10.91.3.230 – 10.91.3.230	10.91.3.230
232	10.91.3.231/32	10.91.3.231 – 10.91.3.231	10.91.3.231
233	10.91.3.232/32	10.91.3.232 – 10.91.3.232	10.91.3.232
234	10.91.3.233/32	10.91.3.233 – 10.91.3.233	10.91.3.233
235	10.91.3.234/32	10.91.3.234 – 10.91.3.234	10.91.3.234
236	10.91.3.235/32	10.91.3.235 – 10.91.3.235	10.91.3.235
237	10.91.3.236/32	10.91.3.236 – 10.91.3.236	10.91.3.236
238	10.91.3.237/32	10.91.3.237 – 10.91.3.237	10.91.3.237
239	10.91.3.238/32	10.91.3.238 – 10.91.3.238	10.91.3.238
240	10.91.3.239/32	10.91.3.239 – 10.91.3.239	10.91.3.239
241	10.91.3.240/32	10.91.3.240 – 10.91.3.240	10.91.3.240
242	10.91.3.241/32	10.91.3.241 – 10.91.3.241	10.91.3.241
243	10.91.3.242/32	10.91.3.242 – 10.91.3.242	10.91.3.242
244	10.91.3.243/32	10.91.3.243 – 10.91.3.243	10.91.3.243
245	10.91.3.244/32	10.91.3.244 – 10.91.3.244	10.91.3.244
246	10.91.3.245/32	10.91.3.245 – 10.91.3.245	10.91.3.245
247	10.91.3.246/32	10.91.3.246 – 10.91.3.246	10.91.3.246
248	10.91.3.247/32	10.91.3.247 – 10.91.3.247	10.91.3.247
249	10.91.3.248/32	10.91.3.248 – 10.91.3.248	10.91.3.248
250	10.91.3.249/32	10.91.3.249 – 10.91.3.249	10.91.3.249
251	10.91.3.250/32	10.91.3.250 – 10.91.3.250	10.91.3.250
252	10.91.3.251/32	10.91.3.251 – 10.91.3.251	10.91.3.251
253	10.91.3.252/32	10.91.3.252 – 10.91.3.252	10.91.3.252
254	10.91.3.253/32	10.91.3.253 – 10.91.3.253	10.91.3.253
255	10.91.3.254/32	10.91.3.254 – 10.91.3.254	10.91.3.254
256	10.91.3.255/32	10.91.3.255 – 10.91.3.255	10.91.3.255

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 →