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)10.5.240.0/21

network10.5.240.0/21

broadcast10.5.247.255

first host10.5.240.1

last host10.5.247.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.240.0/21

address00001010.00000101.11110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.11110000.00000000

broadcast00001010.00000101.11110111.11111111

green = network part, grey = host part

hex0x0a05f000

decimal168161280

reverse dns0.240.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:f000

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.5.240.0/32	10.5.240.0 – 10.5.240.0	10.5.240.0
2	10.5.240.1/32	10.5.240.1 – 10.5.240.1	10.5.240.1
3	10.5.240.2/32	10.5.240.2 – 10.5.240.2	10.5.240.2
4	10.5.240.3/32	10.5.240.3 – 10.5.240.3	10.5.240.3
5	10.5.240.4/32	10.5.240.4 – 10.5.240.4	10.5.240.4
6	10.5.240.5/32	10.5.240.5 – 10.5.240.5	10.5.240.5
7	10.5.240.6/32	10.5.240.6 – 10.5.240.6	10.5.240.6
8	10.5.240.7/32	10.5.240.7 – 10.5.240.7	10.5.240.7
9	10.5.240.8/32	10.5.240.8 – 10.5.240.8	10.5.240.8
10	10.5.240.9/32	10.5.240.9 – 10.5.240.9	10.5.240.9
11	10.5.240.10/32	10.5.240.10 – 10.5.240.10	10.5.240.10
12	10.5.240.11/32	10.5.240.11 – 10.5.240.11	10.5.240.11
13	10.5.240.12/32	10.5.240.12 – 10.5.240.12	10.5.240.12
14	10.5.240.13/32	10.5.240.13 – 10.5.240.13	10.5.240.13
15	10.5.240.14/32	10.5.240.14 – 10.5.240.14	10.5.240.14
16	10.5.240.15/32	10.5.240.15 – 10.5.240.15	10.5.240.15
17	10.5.240.16/32	10.5.240.16 – 10.5.240.16	10.5.240.16
18	10.5.240.17/32	10.5.240.17 – 10.5.240.17	10.5.240.17
19	10.5.240.18/32	10.5.240.18 – 10.5.240.18	10.5.240.18
20	10.5.240.19/32	10.5.240.19 – 10.5.240.19	10.5.240.19
21	10.5.240.20/32	10.5.240.20 – 10.5.240.20	10.5.240.20
22	10.5.240.21/32	10.5.240.21 – 10.5.240.21	10.5.240.21
23	10.5.240.22/32	10.5.240.22 – 10.5.240.22	10.5.240.22
24	10.5.240.23/32	10.5.240.23 – 10.5.240.23	10.5.240.23
25	10.5.240.24/32	10.5.240.24 – 10.5.240.24	10.5.240.24
26	10.5.240.25/32	10.5.240.25 – 10.5.240.25	10.5.240.25
27	10.5.240.26/32	10.5.240.26 – 10.5.240.26	10.5.240.26
28	10.5.240.27/32	10.5.240.27 – 10.5.240.27	10.5.240.27
29	10.5.240.28/32	10.5.240.28 – 10.5.240.28	10.5.240.28
30	10.5.240.29/32	10.5.240.29 – 10.5.240.29	10.5.240.29
31	10.5.240.30/32	10.5.240.30 – 10.5.240.30	10.5.240.30
32	10.5.240.31/32	10.5.240.31 – 10.5.240.31	10.5.240.31
33	10.5.240.32/32	10.5.240.32 – 10.5.240.32	10.5.240.32
34	10.5.240.33/32	10.5.240.33 – 10.5.240.33	10.5.240.33
35	10.5.240.34/32	10.5.240.34 – 10.5.240.34	10.5.240.34
36	10.5.240.35/32	10.5.240.35 – 10.5.240.35	10.5.240.35
37	10.5.240.36/32	10.5.240.36 – 10.5.240.36	10.5.240.36
38	10.5.240.37/32	10.5.240.37 – 10.5.240.37	10.5.240.37
39	10.5.240.38/32	10.5.240.38 – 10.5.240.38	10.5.240.38
40	10.5.240.39/32	10.5.240.39 – 10.5.240.39	10.5.240.39
41	10.5.240.40/32	10.5.240.40 – 10.5.240.40	10.5.240.40
42	10.5.240.41/32	10.5.240.41 – 10.5.240.41	10.5.240.41
43	10.5.240.42/32	10.5.240.42 – 10.5.240.42	10.5.240.42
44	10.5.240.43/32	10.5.240.43 – 10.5.240.43	10.5.240.43
45	10.5.240.44/32	10.5.240.44 – 10.5.240.44	10.5.240.44
46	10.5.240.45/32	10.5.240.45 – 10.5.240.45	10.5.240.45
47	10.5.240.46/32	10.5.240.46 – 10.5.240.46	10.5.240.46
48	10.5.240.47/32	10.5.240.47 – 10.5.240.47	10.5.240.47
49	10.5.240.48/32	10.5.240.48 – 10.5.240.48	10.5.240.48
50	10.5.240.49/32	10.5.240.49 – 10.5.240.49	10.5.240.49
51	10.5.240.50/32	10.5.240.50 – 10.5.240.50	10.5.240.50
52	10.5.240.51/32	10.5.240.51 – 10.5.240.51	10.5.240.51
53	10.5.240.52/32	10.5.240.52 – 10.5.240.52	10.5.240.52
54	10.5.240.53/32	10.5.240.53 – 10.5.240.53	10.5.240.53
55	10.5.240.54/32	10.5.240.54 – 10.5.240.54	10.5.240.54
56	10.5.240.55/32	10.5.240.55 – 10.5.240.55	10.5.240.55
57	10.5.240.56/32	10.5.240.56 – 10.5.240.56	10.5.240.56
58	10.5.240.57/32	10.5.240.57 – 10.5.240.57	10.5.240.57
59	10.5.240.58/32	10.5.240.58 – 10.5.240.58	10.5.240.58
60	10.5.240.59/32	10.5.240.59 – 10.5.240.59	10.5.240.59
61	10.5.240.60/32	10.5.240.60 – 10.5.240.60	10.5.240.60
62	10.5.240.61/32	10.5.240.61 – 10.5.240.61	10.5.240.61
63	10.5.240.62/32	10.5.240.62 – 10.5.240.62	10.5.240.62
64	10.5.240.63/32	10.5.240.63 – 10.5.240.63	10.5.240.63
65	10.5.240.64/32	10.5.240.64 – 10.5.240.64	10.5.240.64
66	10.5.240.65/32	10.5.240.65 – 10.5.240.65	10.5.240.65
67	10.5.240.66/32	10.5.240.66 – 10.5.240.66	10.5.240.66
68	10.5.240.67/32	10.5.240.67 – 10.5.240.67	10.5.240.67
69	10.5.240.68/32	10.5.240.68 – 10.5.240.68	10.5.240.68
70	10.5.240.69/32	10.5.240.69 – 10.5.240.69	10.5.240.69
71	10.5.240.70/32	10.5.240.70 – 10.5.240.70	10.5.240.70
72	10.5.240.71/32	10.5.240.71 – 10.5.240.71	10.5.240.71
73	10.5.240.72/32	10.5.240.72 – 10.5.240.72	10.5.240.72
74	10.5.240.73/32	10.5.240.73 – 10.5.240.73	10.5.240.73
75	10.5.240.74/32	10.5.240.74 – 10.5.240.74	10.5.240.74
76	10.5.240.75/32	10.5.240.75 – 10.5.240.75	10.5.240.75
77	10.5.240.76/32	10.5.240.76 – 10.5.240.76	10.5.240.76
78	10.5.240.77/32	10.5.240.77 – 10.5.240.77	10.5.240.77
79	10.5.240.78/32	10.5.240.78 – 10.5.240.78	10.5.240.78
80	10.5.240.79/32	10.5.240.79 – 10.5.240.79	10.5.240.79
81	10.5.240.80/32	10.5.240.80 – 10.5.240.80	10.5.240.80
82	10.5.240.81/32	10.5.240.81 – 10.5.240.81	10.5.240.81
83	10.5.240.82/32	10.5.240.82 – 10.5.240.82	10.5.240.82
84	10.5.240.83/32	10.5.240.83 – 10.5.240.83	10.5.240.83
85	10.5.240.84/32	10.5.240.84 – 10.5.240.84	10.5.240.84
86	10.5.240.85/32	10.5.240.85 – 10.5.240.85	10.5.240.85
87	10.5.240.86/32	10.5.240.86 – 10.5.240.86	10.5.240.86
88	10.5.240.87/32	10.5.240.87 – 10.5.240.87	10.5.240.87
89	10.5.240.88/32	10.5.240.88 – 10.5.240.88	10.5.240.88
90	10.5.240.89/32	10.5.240.89 – 10.5.240.89	10.5.240.89
91	10.5.240.90/32	10.5.240.90 – 10.5.240.90	10.5.240.90
92	10.5.240.91/32	10.5.240.91 – 10.5.240.91	10.5.240.91
93	10.5.240.92/32	10.5.240.92 – 10.5.240.92	10.5.240.92
94	10.5.240.93/32	10.5.240.93 – 10.5.240.93	10.5.240.93
95	10.5.240.94/32	10.5.240.94 – 10.5.240.94	10.5.240.94
96	10.5.240.95/32	10.5.240.95 – 10.5.240.95	10.5.240.95
97	10.5.240.96/32	10.5.240.96 – 10.5.240.96	10.5.240.96
98	10.5.240.97/32	10.5.240.97 – 10.5.240.97	10.5.240.97
99	10.5.240.98/32	10.5.240.98 – 10.5.240.98	10.5.240.98
100	10.5.240.99/32	10.5.240.99 – 10.5.240.99	10.5.240.99
101	10.5.240.100/32	10.5.240.100 – 10.5.240.100	10.5.240.100
102	10.5.240.101/32	10.5.240.101 – 10.5.240.101	10.5.240.101
103	10.5.240.102/32	10.5.240.102 – 10.5.240.102	10.5.240.102
104	10.5.240.103/32	10.5.240.103 – 10.5.240.103	10.5.240.103
105	10.5.240.104/32	10.5.240.104 – 10.5.240.104	10.5.240.104
106	10.5.240.105/32	10.5.240.105 – 10.5.240.105	10.5.240.105
107	10.5.240.106/32	10.5.240.106 – 10.5.240.106	10.5.240.106
108	10.5.240.107/32	10.5.240.107 – 10.5.240.107	10.5.240.107
109	10.5.240.108/32	10.5.240.108 – 10.5.240.108	10.5.240.108
110	10.5.240.109/32	10.5.240.109 – 10.5.240.109	10.5.240.109
111	10.5.240.110/32	10.5.240.110 – 10.5.240.110	10.5.240.110
112	10.5.240.111/32	10.5.240.111 – 10.5.240.111	10.5.240.111
113	10.5.240.112/32	10.5.240.112 – 10.5.240.112	10.5.240.112
114	10.5.240.113/32	10.5.240.113 – 10.5.240.113	10.5.240.113
115	10.5.240.114/32	10.5.240.114 – 10.5.240.114	10.5.240.114
116	10.5.240.115/32	10.5.240.115 – 10.5.240.115	10.5.240.115
117	10.5.240.116/32	10.5.240.116 – 10.5.240.116	10.5.240.116
118	10.5.240.117/32	10.5.240.117 – 10.5.240.117	10.5.240.117
119	10.5.240.118/32	10.5.240.118 – 10.5.240.118	10.5.240.118
120	10.5.240.119/32	10.5.240.119 – 10.5.240.119	10.5.240.119
121	10.5.240.120/32	10.5.240.120 – 10.5.240.120	10.5.240.120
122	10.5.240.121/32	10.5.240.121 – 10.5.240.121	10.5.240.121
123	10.5.240.122/32	10.5.240.122 – 10.5.240.122	10.5.240.122
124	10.5.240.123/32	10.5.240.123 – 10.5.240.123	10.5.240.123
125	10.5.240.124/32	10.5.240.124 – 10.5.240.124	10.5.240.124
126	10.5.240.125/32	10.5.240.125 – 10.5.240.125	10.5.240.125
127	10.5.240.126/32	10.5.240.126 – 10.5.240.126	10.5.240.126
128	10.5.240.127/32	10.5.240.127 – 10.5.240.127	10.5.240.127
129	10.5.240.128/32	10.5.240.128 – 10.5.240.128	10.5.240.128
130	10.5.240.129/32	10.5.240.129 – 10.5.240.129	10.5.240.129
131	10.5.240.130/32	10.5.240.130 – 10.5.240.130	10.5.240.130
132	10.5.240.131/32	10.5.240.131 – 10.5.240.131	10.5.240.131
133	10.5.240.132/32	10.5.240.132 – 10.5.240.132	10.5.240.132
134	10.5.240.133/32	10.5.240.133 – 10.5.240.133	10.5.240.133
135	10.5.240.134/32	10.5.240.134 – 10.5.240.134	10.5.240.134
136	10.5.240.135/32	10.5.240.135 – 10.5.240.135	10.5.240.135
137	10.5.240.136/32	10.5.240.136 – 10.5.240.136	10.5.240.136
138	10.5.240.137/32	10.5.240.137 – 10.5.240.137	10.5.240.137
139	10.5.240.138/32	10.5.240.138 – 10.5.240.138	10.5.240.138
140	10.5.240.139/32	10.5.240.139 – 10.5.240.139	10.5.240.139
141	10.5.240.140/32	10.5.240.140 – 10.5.240.140	10.5.240.140
142	10.5.240.141/32	10.5.240.141 – 10.5.240.141	10.5.240.141
143	10.5.240.142/32	10.5.240.142 – 10.5.240.142	10.5.240.142
144	10.5.240.143/32	10.5.240.143 – 10.5.240.143	10.5.240.143
145	10.5.240.144/32	10.5.240.144 – 10.5.240.144	10.5.240.144
146	10.5.240.145/32	10.5.240.145 – 10.5.240.145	10.5.240.145
147	10.5.240.146/32	10.5.240.146 – 10.5.240.146	10.5.240.146
148	10.5.240.147/32	10.5.240.147 – 10.5.240.147	10.5.240.147
149	10.5.240.148/32	10.5.240.148 – 10.5.240.148	10.5.240.148
150	10.5.240.149/32	10.5.240.149 – 10.5.240.149	10.5.240.149
151	10.5.240.150/32	10.5.240.150 – 10.5.240.150	10.5.240.150
152	10.5.240.151/32	10.5.240.151 – 10.5.240.151	10.5.240.151
153	10.5.240.152/32	10.5.240.152 – 10.5.240.152	10.5.240.152
154	10.5.240.153/32	10.5.240.153 – 10.5.240.153	10.5.240.153
155	10.5.240.154/32	10.5.240.154 – 10.5.240.154	10.5.240.154
156	10.5.240.155/32	10.5.240.155 – 10.5.240.155	10.5.240.155
157	10.5.240.156/32	10.5.240.156 – 10.5.240.156	10.5.240.156
158	10.5.240.157/32	10.5.240.157 – 10.5.240.157	10.5.240.157
159	10.5.240.158/32	10.5.240.158 – 10.5.240.158	10.5.240.158
160	10.5.240.159/32	10.5.240.159 – 10.5.240.159	10.5.240.159
161	10.5.240.160/32	10.5.240.160 – 10.5.240.160	10.5.240.160
162	10.5.240.161/32	10.5.240.161 – 10.5.240.161	10.5.240.161
163	10.5.240.162/32	10.5.240.162 – 10.5.240.162	10.5.240.162
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170	10.5.240.169/32	10.5.240.169 – 10.5.240.169	10.5.240.169
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210	10.5.240.209/32	10.5.240.209 – 10.5.240.209	10.5.240.209
211	10.5.240.210/32	10.5.240.210 – 10.5.240.210	10.5.240.210
212	10.5.240.211/32	10.5.240.211 – 10.5.240.211	10.5.240.211
213	10.5.240.212/32	10.5.240.212 – 10.5.240.212	10.5.240.212
214	10.5.240.213/32	10.5.240.213 – 10.5.240.213	10.5.240.213
215	10.5.240.214/32	10.5.240.214 – 10.5.240.214	10.5.240.214
216	10.5.240.215/32	10.5.240.215 – 10.5.240.215	10.5.240.215
217	10.5.240.216/32	10.5.240.216 – 10.5.240.216	10.5.240.216
218	10.5.240.217/32	10.5.240.217 – 10.5.240.217	10.5.240.217
219	10.5.240.218/32	10.5.240.218 – 10.5.240.218	10.5.240.218
220	10.5.240.219/32	10.5.240.219 – 10.5.240.219	10.5.240.219
221	10.5.240.220/32	10.5.240.220 – 10.5.240.220	10.5.240.220
222	10.5.240.221/32	10.5.240.221 – 10.5.240.221	10.5.240.221
223	10.5.240.222/32	10.5.240.222 – 10.5.240.222	10.5.240.222
224	10.5.240.223/32	10.5.240.223 – 10.5.240.223	10.5.240.223
225	10.5.240.224/32	10.5.240.224 – 10.5.240.224	10.5.240.224
226	10.5.240.225/32	10.5.240.225 – 10.5.240.225	10.5.240.225
227	10.5.240.226/32	10.5.240.226 – 10.5.240.226	10.5.240.226
228	10.5.240.227/32	10.5.240.227 – 10.5.240.227	10.5.240.227
229	10.5.240.228/32	10.5.240.228 – 10.5.240.228	10.5.240.228
230	10.5.240.229/32	10.5.240.229 – 10.5.240.229	10.5.240.229
231	10.5.240.230/32	10.5.240.230 – 10.5.240.230	10.5.240.230
232	10.5.240.231/32	10.5.240.231 – 10.5.240.231	10.5.240.231
233	10.5.240.232/32	10.5.240.232 – 10.5.240.232	10.5.240.232
234	10.5.240.233/32	10.5.240.233 – 10.5.240.233	10.5.240.233
235	10.5.240.234/32	10.5.240.234 – 10.5.240.234	10.5.240.234
236	10.5.240.235/32	10.5.240.235 – 10.5.240.235	10.5.240.235
237	10.5.240.236/32	10.5.240.236 – 10.5.240.236	10.5.240.236
238	10.5.240.237/32	10.5.240.237 – 10.5.240.237	10.5.240.237
239	10.5.240.238/32	10.5.240.238 – 10.5.240.238	10.5.240.238
240	10.5.240.239/32	10.5.240.239 – 10.5.240.239	10.5.240.239
241	10.5.240.240/32	10.5.240.240 – 10.5.240.240	10.5.240.240
242	10.5.240.241/32	10.5.240.241 – 10.5.240.241	10.5.240.241
243	10.5.240.242/32	10.5.240.242 – 10.5.240.242	10.5.240.242
244	10.5.240.243/32	10.5.240.243 – 10.5.240.243	10.5.240.243
245	10.5.240.244/32	10.5.240.244 – 10.5.240.244	10.5.240.244
246	10.5.240.245/32	10.5.240.245 – 10.5.240.245	10.5.240.245
247	10.5.240.246/32	10.5.240.246 – 10.5.240.246	10.5.240.246
248	10.5.240.247/32	10.5.240.247 – 10.5.240.247	10.5.240.247
249	10.5.240.248/32	10.5.240.248 – 10.5.240.248	10.5.240.248
250	10.5.240.249/32	10.5.240.249 – 10.5.240.249	10.5.240.249
251	10.5.240.250/32	10.5.240.250 – 10.5.240.250	10.5.240.250
252	10.5.240.251/32	10.5.240.251 – 10.5.240.251	10.5.240.251
253	10.5.240.252/32	10.5.240.252 – 10.5.240.252	10.5.240.252
254	10.5.240.253/32	10.5.240.253 – 10.5.240.253	10.5.240.253
255	10.5.240.254/32	10.5.240.254 – 10.5.240.254	10.5.240.254
256	10.5.240.255/32	10.5.240.255 – 10.5.240.255	10.5.240.255

showing 256 of 2,048

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →