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)10.5.112.0/21

network10.5.112.0/21

broadcast10.5.119.255

first host10.5.112.1

last host10.5.119.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.112.0/21

address00001010.00000101.01110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.01110000.00000000

broadcast00001010.00000101.01110111.11111111

green = network part, grey = host part

hex0x0a057000

decimal168128512

reverse dns0.112.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:7000

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.5.112.0/32	10.5.112.0 – 10.5.112.0	10.5.112.0
2	10.5.112.1/32	10.5.112.1 – 10.5.112.1	10.5.112.1
3	10.5.112.2/32	10.5.112.2 – 10.5.112.2	10.5.112.2
4	10.5.112.3/32	10.5.112.3 – 10.5.112.3	10.5.112.3
5	10.5.112.4/32	10.5.112.4 – 10.5.112.4	10.5.112.4
6	10.5.112.5/32	10.5.112.5 – 10.5.112.5	10.5.112.5
7	10.5.112.6/32	10.5.112.6 – 10.5.112.6	10.5.112.6
8	10.5.112.7/32	10.5.112.7 – 10.5.112.7	10.5.112.7
9	10.5.112.8/32	10.5.112.8 – 10.5.112.8	10.5.112.8
10	10.5.112.9/32	10.5.112.9 – 10.5.112.9	10.5.112.9
11	10.5.112.10/32	10.5.112.10 – 10.5.112.10	10.5.112.10
12	10.5.112.11/32	10.5.112.11 – 10.5.112.11	10.5.112.11
13	10.5.112.12/32	10.5.112.12 – 10.5.112.12	10.5.112.12
14	10.5.112.13/32	10.5.112.13 – 10.5.112.13	10.5.112.13
15	10.5.112.14/32	10.5.112.14 – 10.5.112.14	10.5.112.14
16	10.5.112.15/32	10.5.112.15 – 10.5.112.15	10.5.112.15
17	10.5.112.16/32	10.5.112.16 – 10.5.112.16	10.5.112.16
18	10.5.112.17/32	10.5.112.17 – 10.5.112.17	10.5.112.17
19	10.5.112.18/32	10.5.112.18 – 10.5.112.18	10.5.112.18
20	10.5.112.19/32	10.5.112.19 – 10.5.112.19	10.5.112.19
21	10.5.112.20/32	10.5.112.20 – 10.5.112.20	10.5.112.20
22	10.5.112.21/32	10.5.112.21 – 10.5.112.21	10.5.112.21
23	10.5.112.22/32	10.5.112.22 – 10.5.112.22	10.5.112.22
24	10.5.112.23/32	10.5.112.23 – 10.5.112.23	10.5.112.23
25	10.5.112.24/32	10.5.112.24 – 10.5.112.24	10.5.112.24
26	10.5.112.25/32	10.5.112.25 – 10.5.112.25	10.5.112.25
27	10.5.112.26/32	10.5.112.26 – 10.5.112.26	10.5.112.26
28	10.5.112.27/32	10.5.112.27 – 10.5.112.27	10.5.112.27
29	10.5.112.28/32	10.5.112.28 – 10.5.112.28	10.5.112.28
30	10.5.112.29/32	10.5.112.29 – 10.5.112.29	10.5.112.29
31	10.5.112.30/32	10.5.112.30 – 10.5.112.30	10.5.112.30
32	10.5.112.31/32	10.5.112.31 – 10.5.112.31	10.5.112.31
33	10.5.112.32/32	10.5.112.32 – 10.5.112.32	10.5.112.32
34	10.5.112.33/32	10.5.112.33 – 10.5.112.33	10.5.112.33
35	10.5.112.34/32	10.5.112.34 – 10.5.112.34	10.5.112.34
36	10.5.112.35/32	10.5.112.35 – 10.5.112.35	10.5.112.35
37	10.5.112.36/32	10.5.112.36 – 10.5.112.36	10.5.112.36
38	10.5.112.37/32	10.5.112.37 – 10.5.112.37	10.5.112.37
39	10.5.112.38/32	10.5.112.38 – 10.5.112.38	10.5.112.38
40	10.5.112.39/32	10.5.112.39 – 10.5.112.39	10.5.112.39
41	10.5.112.40/32	10.5.112.40 – 10.5.112.40	10.5.112.40
42	10.5.112.41/32	10.5.112.41 – 10.5.112.41	10.5.112.41
43	10.5.112.42/32	10.5.112.42 – 10.5.112.42	10.5.112.42
44	10.5.112.43/32	10.5.112.43 – 10.5.112.43	10.5.112.43
45	10.5.112.44/32	10.5.112.44 – 10.5.112.44	10.5.112.44
46	10.5.112.45/32	10.5.112.45 – 10.5.112.45	10.5.112.45
47	10.5.112.46/32	10.5.112.46 – 10.5.112.46	10.5.112.46
48	10.5.112.47/32	10.5.112.47 – 10.5.112.47	10.5.112.47
49	10.5.112.48/32	10.5.112.48 – 10.5.112.48	10.5.112.48
50	10.5.112.49/32	10.5.112.49 – 10.5.112.49	10.5.112.49
51	10.5.112.50/32	10.5.112.50 – 10.5.112.50	10.5.112.50
52	10.5.112.51/32	10.5.112.51 – 10.5.112.51	10.5.112.51
53	10.5.112.52/32	10.5.112.52 – 10.5.112.52	10.5.112.52
54	10.5.112.53/32	10.5.112.53 – 10.5.112.53	10.5.112.53
55	10.5.112.54/32	10.5.112.54 – 10.5.112.54	10.5.112.54
56	10.5.112.55/32	10.5.112.55 – 10.5.112.55	10.5.112.55
57	10.5.112.56/32	10.5.112.56 – 10.5.112.56	10.5.112.56
58	10.5.112.57/32	10.5.112.57 – 10.5.112.57	10.5.112.57
59	10.5.112.58/32	10.5.112.58 – 10.5.112.58	10.5.112.58
60	10.5.112.59/32	10.5.112.59 – 10.5.112.59	10.5.112.59
61	10.5.112.60/32	10.5.112.60 – 10.5.112.60	10.5.112.60
62	10.5.112.61/32	10.5.112.61 – 10.5.112.61	10.5.112.61
63	10.5.112.62/32	10.5.112.62 – 10.5.112.62	10.5.112.62
64	10.5.112.63/32	10.5.112.63 – 10.5.112.63	10.5.112.63
65	10.5.112.64/32	10.5.112.64 – 10.5.112.64	10.5.112.64
66	10.5.112.65/32	10.5.112.65 – 10.5.112.65	10.5.112.65
67	10.5.112.66/32	10.5.112.66 – 10.5.112.66	10.5.112.66
68	10.5.112.67/32	10.5.112.67 – 10.5.112.67	10.5.112.67
69	10.5.112.68/32	10.5.112.68 – 10.5.112.68	10.5.112.68
70	10.5.112.69/32	10.5.112.69 – 10.5.112.69	10.5.112.69
71	10.5.112.70/32	10.5.112.70 – 10.5.112.70	10.5.112.70
72	10.5.112.71/32	10.5.112.71 – 10.5.112.71	10.5.112.71
73	10.5.112.72/32	10.5.112.72 – 10.5.112.72	10.5.112.72
74	10.5.112.73/32	10.5.112.73 – 10.5.112.73	10.5.112.73
75	10.5.112.74/32	10.5.112.74 – 10.5.112.74	10.5.112.74
76	10.5.112.75/32	10.5.112.75 – 10.5.112.75	10.5.112.75
77	10.5.112.76/32	10.5.112.76 – 10.5.112.76	10.5.112.76
78	10.5.112.77/32	10.5.112.77 – 10.5.112.77	10.5.112.77
79	10.5.112.78/32	10.5.112.78 – 10.5.112.78	10.5.112.78
80	10.5.112.79/32	10.5.112.79 – 10.5.112.79	10.5.112.79
81	10.5.112.80/32	10.5.112.80 – 10.5.112.80	10.5.112.80
82	10.5.112.81/32	10.5.112.81 – 10.5.112.81	10.5.112.81
83	10.5.112.82/32	10.5.112.82 – 10.5.112.82	10.5.112.82
84	10.5.112.83/32	10.5.112.83 – 10.5.112.83	10.5.112.83
85	10.5.112.84/32	10.5.112.84 – 10.5.112.84	10.5.112.84
86	10.5.112.85/32	10.5.112.85 – 10.5.112.85	10.5.112.85
87	10.5.112.86/32	10.5.112.86 – 10.5.112.86	10.5.112.86
88	10.5.112.87/32	10.5.112.87 – 10.5.112.87	10.5.112.87
89	10.5.112.88/32	10.5.112.88 – 10.5.112.88	10.5.112.88
90	10.5.112.89/32	10.5.112.89 – 10.5.112.89	10.5.112.89
91	10.5.112.90/32	10.5.112.90 – 10.5.112.90	10.5.112.90
92	10.5.112.91/32	10.5.112.91 – 10.5.112.91	10.5.112.91
93	10.5.112.92/32	10.5.112.92 – 10.5.112.92	10.5.112.92
94	10.5.112.93/32	10.5.112.93 – 10.5.112.93	10.5.112.93
95	10.5.112.94/32	10.5.112.94 – 10.5.112.94	10.5.112.94
96	10.5.112.95/32	10.5.112.95 – 10.5.112.95	10.5.112.95
97	10.5.112.96/32	10.5.112.96 – 10.5.112.96	10.5.112.96
98	10.5.112.97/32	10.5.112.97 – 10.5.112.97	10.5.112.97
99	10.5.112.98/32	10.5.112.98 – 10.5.112.98	10.5.112.98
100	10.5.112.99/32	10.5.112.99 – 10.5.112.99	10.5.112.99
101	10.5.112.100/32	10.5.112.100 – 10.5.112.100	10.5.112.100
102	10.5.112.101/32	10.5.112.101 – 10.5.112.101	10.5.112.101
103	10.5.112.102/32	10.5.112.102 – 10.5.112.102	10.5.112.102
104	10.5.112.103/32	10.5.112.103 – 10.5.112.103	10.5.112.103
105	10.5.112.104/32	10.5.112.104 – 10.5.112.104	10.5.112.104
106	10.5.112.105/32	10.5.112.105 – 10.5.112.105	10.5.112.105
107	10.5.112.106/32	10.5.112.106 – 10.5.112.106	10.5.112.106
108	10.5.112.107/32	10.5.112.107 – 10.5.112.107	10.5.112.107
109	10.5.112.108/32	10.5.112.108 – 10.5.112.108	10.5.112.108
110	10.5.112.109/32	10.5.112.109 – 10.5.112.109	10.5.112.109
111	10.5.112.110/32	10.5.112.110 – 10.5.112.110	10.5.112.110
112	10.5.112.111/32	10.5.112.111 – 10.5.112.111	10.5.112.111
113	10.5.112.112/32	10.5.112.112 – 10.5.112.112	10.5.112.112
114	10.5.112.113/32	10.5.112.113 – 10.5.112.113	10.5.112.113
115	10.5.112.114/32	10.5.112.114 – 10.5.112.114	10.5.112.114
116	10.5.112.115/32	10.5.112.115 – 10.5.112.115	10.5.112.115
117	10.5.112.116/32	10.5.112.116 – 10.5.112.116	10.5.112.116
118	10.5.112.117/32	10.5.112.117 – 10.5.112.117	10.5.112.117
119	10.5.112.118/32	10.5.112.118 – 10.5.112.118	10.5.112.118
120	10.5.112.119/32	10.5.112.119 – 10.5.112.119	10.5.112.119
121	10.5.112.120/32	10.5.112.120 – 10.5.112.120	10.5.112.120
122	10.5.112.121/32	10.5.112.121 – 10.5.112.121	10.5.112.121
123	10.5.112.122/32	10.5.112.122 – 10.5.112.122	10.5.112.122
124	10.5.112.123/32	10.5.112.123 – 10.5.112.123	10.5.112.123
125	10.5.112.124/32	10.5.112.124 – 10.5.112.124	10.5.112.124
126	10.5.112.125/32	10.5.112.125 – 10.5.112.125	10.5.112.125
127	10.5.112.126/32	10.5.112.126 – 10.5.112.126	10.5.112.126
128	10.5.112.127/32	10.5.112.127 – 10.5.112.127	10.5.112.127
129	10.5.112.128/32	10.5.112.128 – 10.5.112.128	10.5.112.128
130	10.5.112.129/32	10.5.112.129 – 10.5.112.129	10.5.112.129
131	10.5.112.130/32	10.5.112.130 – 10.5.112.130	10.5.112.130
132	10.5.112.131/32	10.5.112.131 – 10.5.112.131	10.5.112.131
133	10.5.112.132/32	10.5.112.132 – 10.5.112.132	10.5.112.132
134	10.5.112.133/32	10.5.112.133 – 10.5.112.133	10.5.112.133
135	10.5.112.134/32	10.5.112.134 – 10.5.112.134	10.5.112.134
136	10.5.112.135/32	10.5.112.135 – 10.5.112.135	10.5.112.135
137	10.5.112.136/32	10.5.112.136 – 10.5.112.136	10.5.112.136
138	10.5.112.137/32	10.5.112.137 – 10.5.112.137	10.5.112.137
139	10.5.112.138/32	10.5.112.138 – 10.5.112.138	10.5.112.138
140	10.5.112.139/32	10.5.112.139 – 10.5.112.139	10.5.112.139
141	10.5.112.140/32	10.5.112.140 – 10.5.112.140	10.5.112.140
142	10.5.112.141/32	10.5.112.141 – 10.5.112.141	10.5.112.141
143	10.5.112.142/32	10.5.112.142 – 10.5.112.142	10.5.112.142
144	10.5.112.143/32	10.5.112.143 – 10.5.112.143	10.5.112.143
145	10.5.112.144/32	10.5.112.144 – 10.5.112.144	10.5.112.144
146	10.5.112.145/32	10.5.112.145 – 10.5.112.145	10.5.112.145
147	10.5.112.146/32	10.5.112.146 – 10.5.112.146	10.5.112.146
148	10.5.112.147/32	10.5.112.147 – 10.5.112.147	10.5.112.147
149	10.5.112.148/32	10.5.112.148 – 10.5.112.148	10.5.112.148
150	10.5.112.149/32	10.5.112.149 – 10.5.112.149	10.5.112.149
151	10.5.112.150/32	10.5.112.150 – 10.5.112.150	10.5.112.150
152	10.5.112.151/32	10.5.112.151 – 10.5.112.151	10.5.112.151
153	10.5.112.152/32	10.5.112.152 – 10.5.112.152	10.5.112.152
154	10.5.112.153/32	10.5.112.153 – 10.5.112.153	10.5.112.153
155	10.5.112.154/32	10.5.112.154 – 10.5.112.154	10.5.112.154
156	10.5.112.155/32	10.5.112.155 – 10.5.112.155	10.5.112.155
157	10.5.112.156/32	10.5.112.156 – 10.5.112.156	10.5.112.156
158	10.5.112.157/32	10.5.112.157 – 10.5.112.157	10.5.112.157
159	10.5.112.158/32	10.5.112.158 – 10.5.112.158	10.5.112.158
160	10.5.112.159/32	10.5.112.159 – 10.5.112.159	10.5.112.159
161	10.5.112.160/32	10.5.112.160 – 10.5.112.160	10.5.112.160
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170	10.5.112.169/32	10.5.112.169 – 10.5.112.169	10.5.112.169
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210	10.5.112.209/32	10.5.112.209 – 10.5.112.209	10.5.112.209
211	10.5.112.210/32	10.5.112.210 – 10.5.112.210	10.5.112.210
212	10.5.112.211/32	10.5.112.211 – 10.5.112.211	10.5.112.211
213	10.5.112.212/32	10.5.112.212 – 10.5.112.212	10.5.112.212
214	10.5.112.213/32	10.5.112.213 – 10.5.112.213	10.5.112.213
215	10.5.112.214/32	10.5.112.214 – 10.5.112.214	10.5.112.214
216	10.5.112.215/32	10.5.112.215 – 10.5.112.215	10.5.112.215
217	10.5.112.216/32	10.5.112.216 – 10.5.112.216	10.5.112.216
218	10.5.112.217/32	10.5.112.217 – 10.5.112.217	10.5.112.217
219	10.5.112.218/32	10.5.112.218 – 10.5.112.218	10.5.112.218
220	10.5.112.219/32	10.5.112.219 – 10.5.112.219	10.5.112.219
221	10.5.112.220/32	10.5.112.220 – 10.5.112.220	10.5.112.220
222	10.5.112.221/32	10.5.112.221 – 10.5.112.221	10.5.112.221
223	10.5.112.222/32	10.5.112.222 – 10.5.112.222	10.5.112.222
224	10.5.112.223/32	10.5.112.223 – 10.5.112.223	10.5.112.223
225	10.5.112.224/32	10.5.112.224 – 10.5.112.224	10.5.112.224
226	10.5.112.225/32	10.5.112.225 – 10.5.112.225	10.5.112.225
227	10.5.112.226/32	10.5.112.226 – 10.5.112.226	10.5.112.226
228	10.5.112.227/32	10.5.112.227 – 10.5.112.227	10.5.112.227
229	10.5.112.228/32	10.5.112.228 – 10.5.112.228	10.5.112.228
230	10.5.112.229/32	10.5.112.229 – 10.5.112.229	10.5.112.229
231	10.5.112.230/32	10.5.112.230 – 10.5.112.230	10.5.112.230
232	10.5.112.231/32	10.5.112.231 – 10.5.112.231	10.5.112.231
233	10.5.112.232/32	10.5.112.232 – 10.5.112.232	10.5.112.232
234	10.5.112.233/32	10.5.112.233 – 10.5.112.233	10.5.112.233
235	10.5.112.234/32	10.5.112.234 – 10.5.112.234	10.5.112.234
236	10.5.112.235/32	10.5.112.235 – 10.5.112.235	10.5.112.235
237	10.5.112.236/32	10.5.112.236 – 10.5.112.236	10.5.112.236
238	10.5.112.237/32	10.5.112.237 – 10.5.112.237	10.5.112.237
239	10.5.112.238/32	10.5.112.238 – 10.5.112.238	10.5.112.238
240	10.5.112.239/32	10.5.112.239 – 10.5.112.239	10.5.112.239
241	10.5.112.240/32	10.5.112.240 – 10.5.112.240	10.5.112.240
242	10.5.112.241/32	10.5.112.241 – 10.5.112.241	10.5.112.241
243	10.5.112.242/32	10.5.112.242 – 10.5.112.242	10.5.112.242
244	10.5.112.243/32	10.5.112.243 – 10.5.112.243	10.5.112.243
245	10.5.112.244/32	10.5.112.244 – 10.5.112.244	10.5.112.244
246	10.5.112.245/32	10.5.112.245 – 10.5.112.245	10.5.112.245
247	10.5.112.246/32	10.5.112.246 – 10.5.112.246	10.5.112.246
248	10.5.112.247/32	10.5.112.247 – 10.5.112.247	10.5.112.247
249	10.5.112.248/32	10.5.112.248 – 10.5.112.248	10.5.112.248
250	10.5.112.249/32	10.5.112.249 – 10.5.112.249	10.5.112.249
251	10.5.112.250/32	10.5.112.250 – 10.5.112.250	10.5.112.250
252	10.5.112.251/32	10.5.112.251 – 10.5.112.251	10.5.112.251
253	10.5.112.252/32	10.5.112.252 – 10.5.112.252	10.5.112.252
254	10.5.112.253/32	10.5.112.253 – 10.5.112.253	10.5.112.253
255	10.5.112.254/32	10.5.112.254 – 10.5.112.254	10.5.112.254
256	10.5.112.255/32	10.5.112.255 – 10.5.112.255	10.5.112.255

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 →