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)10.6.56.0/21

network10.6.56.0/21

broadcast10.6.63.255

first host10.6.56.1

last host10.6.63.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.6.56.0/21

address00001010.00000110.00111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000110.00111000.00000000

broadcast00001010.00000110.00111111.11111111

green = network part, grey = host part

hex0x0a063800

decimal168179712

reverse dns0.56.6.10.in-addr.arpa

ipv4-mapped::ffff:a06:3800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.6.56.0/32	10.6.56.0 – 10.6.56.0	10.6.56.0
2	10.6.56.1/32	10.6.56.1 – 10.6.56.1	10.6.56.1
3	10.6.56.2/32	10.6.56.2 – 10.6.56.2	10.6.56.2
4	10.6.56.3/32	10.6.56.3 – 10.6.56.3	10.6.56.3
5	10.6.56.4/32	10.6.56.4 – 10.6.56.4	10.6.56.4
6	10.6.56.5/32	10.6.56.5 – 10.6.56.5	10.6.56.5
7	10.6.56.6/32	10.6.56.6 – 10.6.56.6	10.6.56.6
8	10.6.56.7/32	10.6.56.7 – 10.6.56.7	10.6.56.7
9	10.6.56.8/32	10.6.56.8 – 10.6.56.8	10.6.56.8
10	10.6.56.9/32	10.6.56.9 – 10.6.56.9	10.6.56.9
11	10.6.56.10/32	10.6.56.10 – 10.6.56.10	10.6.56.10
12	10.6.56.11/32	10.6.56.11 – 10.6.56.11	10.6.56.11
13	10.6.56.12/32	10.6.56.12 – 10.6.56.12	10.6.56.12
14	10.6.56.13/32	10.6.56.13 – 10.6.56.13	10.6.56.13
15	10.6.56.14/32	10.6.56.14 – 10.6.56.14	10.6.56.14
16	10.6.56.15/32	10.6.56.15 – 10.6.56.15	10.6.56.15
17	10.6.56.16/32	10.6.56.16 – 10.6.56.16	10.6.56.16
18	10.6.56.17/32	10.6.56.17 – 10.6.56.17	10.6.56.17
19	10.6.56.18/32	10.6.56.18 – 10.6.56.18	10.6.56.18
20	10.6.56.19/32	10.6.56.19 – 10.6.56.19	10.6.56.19
21	10.6.56.20/32	10.6.56.20 – 10.6.56.20	10.6.56.20
22	10.6.56.21/32	10.6.56.21 – 10.6.56.21	10.6.56.21
23	10.6.56.22/32	10.6.56.22 – 10.6.56.22	10.6.56.22
24	10.6.56.23/32	10.6.56.23 – 10.6.56.23	10.6.56.23
25	10.6.56.24/32	10.6.56.24 – 10.6.56.24	10.6.56.24
26	10.6.56.25/32	10.6.56.25 – 10.6.56.25	10.6.56.25
27	10.6.56.26/32	10.6.56.26 – 10.6.56.26	10.6.56.26
28	10.6.56.27/32	10.6.56.27 – 10.6.56.27	10.6.56.27
29	10.6.56.28/32	10.6.56.28 – 10.6.56.28	10.6.56.28
30	10.6.56.29/32	10.6.56.29 – 10.6.56.29	10.6.56.29
31	10.6.56.30/32	10.6.56.30 – 10.6.56.30	10.6.56.30
32	10.6.56.31/32	10.6.56.31 – 10.6.56.31	10.6.56.31
33	10.6.56.32/32	10.6.56.32 – 10.6.56.32	10.6.56.32
34	10.6.56.33/32	10.6.56.33 – 10.6.56.33	10.6.56.33
35	10.6.56.34/32	10.6.56.34 – 10.6.56.34	10.6.56.34
36	10.6.56.35/32	10.6.56.35 – 10.6.56.35	10.6.56.35
37	10.6.56.36/32	10.6.56.36 – 10.6.56.36	10.6.56.36
38	10.6.56.37/32	10.6.56.37 – 10.6.56.37	10.6.56.37
39	10.6.56.38/32	10.6.56.38 – 10.6.56.38	10.6.56.38
40	10.6.56.39/32	10.6.56.39 – 10.6.56.39	10.6.56.39
41	10.6.56.40/32	10.6.56.40 – 10.6.56.40	10.6.56.40
42	10.6.56.41/32	10.6.56.41 – 10.6.56.41	10.6.56.41
43	10.6.56.42/32	10.6.56.42 – 10.6.56.42	10.6.56.42
44	10.6.56.43/32	10.6.56.43 – 10.6.56.43	10.6.56.43
45	10.6.56.44/32	10.6.56.44 – 10.6.56.44	10.6.56.44
46	10.6.56.45/32	10.6.56.45 – 10.6.56.45	10.6.56.45
47	10.6.56.46/32	10.6.56.46 – 10.6.56.46	10.6.56.46
48	10.6.56.47/32	10.6.56.47 – 10.6.56.47	10.6.56.47
49	10.6.56.48/32	10.6.56.48 – 10.6.56.48	10.6.56.48
50	10.6.56.49/32	10.6.56.49 – 10.6.56.49	10.6.56.49
51	10.6.56.50/32	10.6.56.50 – 10.6.56.50	10.6.56.50
52	10.6.56.51/32	10.6.56.51 – 10.6.56.51	10.6.56.51
53	10.6.56.52/32	10.6.56.52 – 10.6.56.52	10.6.56.52
54	10.6.56.53/32	10.6.56.53 – 10.6.56.53	10.6.56.53
55	10.6.56.54/32	10.6.56.54 – 10.6.56.54	10.6.56.54
56	10.6.56.55/32	10.6.56.55 – 10.6.56.55	10.6.56.55
57	10.6.56.56/32	10.6.56.56 – 10.6.56.56	10.6.56.56
58	10.6.56.57/32	10.6.56.57 – 10.6.56.57	10.6.56.57
59	10.6.56.58/32	10.6.56.58 – 10.6.56.58	10.6.56.58
60	10.6.56.59/32	10.6.56.59 – 10.6.56.59	10.6.56.59
61	10.6.56.60/32	10.6.56.60 – 10.6.56.60	10.6.56.60
62	10.6.56.61/32	10.6.56.61 – 10.6.56.61	10.6.56.61
63	10.6.56.62/32	10.6.56.62 – 10.6.56.62	10.6.56.62
64	10.6.56.63/32	10.6.56.63 – 10.6.56.63	10.6.56.63
65	10.6.56.64/32	10.6.56.64 – 10.6.56.64	10.6.56.64
66	10.6.56.65/32	10.6.56.65 – 10.6.56.65	10.6.56.65
67	10.6.56.66/32	10.6.56.66 – 10.6.56.66	10.6.56.66
68	10.6.56.67/32	10.6.56.67 – 10.6.56.67	10.6.56.67
69	10.6.56.68/32	10.6.56.68 – 10.6.56.68	10.6.56.68
70	10.6.56.69/32	10.6.56.69 – 10.6.56.69	10.6.56.69
71	10.6.56.70/32	10.6.56.70 – 10.6.56.70	10.6.56.70
72	10.6.56.71/32	10.6.56.71 – 10.6.56.71	10.6.56.71
73	10.6.56.72/32	10.6.56.72 – 10.6.56.72	10.6.56.72
74	10.6.56.73/32	10.6.56.73 – 10.6.56.73	10.6.56.73
75	10.6.56.74/32	10.6.56.74 – 10.6.56.74	10.6.56.74
76	10.6.56.75/32	10.6.56.75 – 10.6.56.75	10.6.56.75
77	10.6.56.76/32	10.6.56.76 – 10.6.56.76	10.6.56.76
78	10.6.56.77/32	10.6.56.77 – 10.6.56.77	10.6.56.77
79	10.6.56.78/32	10.6.56.78 – 10.6.56.78	10.6.56.78
80	10.6.56.79/32	10.6.56.79 – 10.6.56.79	10.6.56.79
81	10.6.56.80/32	10.6.56.80 – 10.6.56.80	10.6.56.80
82	10.6.56.81/32	10.6.56.81 – 10.6.56.81	10.6.56.81
83	10.6.56.82/32	10.6.56.82 – 10.6.56.82	10.6.56.82
84	10.6.56.83/32	10.6.56.83 – 10.6.56.83	10.6.56.83
85	10.6.56.84/32	10.6.56.84 – 10.6.56.84	10.6.56.84
86	10.6.56.85/32	10.6.56.85 – 10.6.56.85	10.6.56.85
87	10.6.56.86/32	10.6.56.86 – 10.6.56.86	10.6.56.86
88	10.6.56.87/32	10.6.56.87 – 10.6.56.87	10.6.56.87
89	10.6.56.88/32	10.6.56.88 – 10.6.56.88	10.6.56.88
90	10.6.56.89/32	10.6.56.89 – 10.6.56.89	10.6.56.89
91	10.6.56.90/32	10.6.56.90 – 10.6.56.90	10.6.56.90
92	10.6.56.91/32	10.6.56.91 – 10.6.56.91	10.6.56.91
93	10.6.56.92/32	10.6.56.92 – 10.6.56.92	10.6.56.92
94	10.6.56.93/32	10.6.56.93 – 10.6.56.93	10.6.56.93
95	10.6.56.94/32	10.6.56.94 – 10.6.56.94	10.6.56.94
96	10.6.56.95/32	10.6.56.95 – 10.6.56.95	10.6.56.95
97	10.6.56.96/32	10.6.56.96 – 10.6.56.96	10.6.56.96
98	10.6.56.97/32	10.6.56.97 – 10.6.56.97	10.6.56.97
99	10.6.56.98/32	10.6.56.98 – 10.6.56.98	10.6.56.98
100	10.6.56.99/32	10.6.56.99 – 10.6.56.99	10.6.56.99
101	10.6.56.100/32	10.6.56.100 – 10.6.56.100	10.6.56.100
102	10.6.56.101/32	10.6.56.101 – 10.6.56.101	10.6.56.101
103	10.6.56.102/32	10.6.56.102 – 10.6.56.102	10.6.56.102
104	10.6.56.103/32	10.6.56.103 – 10.6.56.103	10.6.56.103
105	10.6.56.104/32	10.6.56.104 – 10.6.56.104	10.6.56.104
106	10.6.56.105/32	10.6.56.105 – 10.6.56.105	10.6.56.105
107	10.6.56.106/32	10.6.56.106 – 10.6.56.106	10.6.56.106
108	10.6.56.107/32	10.6.56.107 – 10.6.56.107	10.6.56.107
109	10.6.56.108/32	10.6.56.108 – 10.6.56.108	10.6.56.108
110	10.6.56.109/32	10.6.56.109 – 10.6.56.109	10.6.56.109
111	10.6.56.110/32	10.6.56.110 – 10.6.56.110	10.6.56.110
112	10.6.56.111/32	10.6.56.111 – 10.6.56.111	10.6.56.111
113	10.6.56.112/32	10.6.56.112 – 10.6.56.112	10.6.56.112
114	10.6.56.113/32	10.6.56.113 – 10.6.56.113	10.6.56.113
115	10.6.56.114/32	10.6.56.114 – 10.6.56.114	10.6.56.114
116	10.6.56.115/32	10.6.56.115 – 10.6.56.115	10.6.56.115
117	10.6.56.116/32	10.6.56.116 – 10.6.56.116	10.6.56.116
118	10.6.56.117/32	10.6.56.117 – 10.6.56.117	10.6.56.117
119	10.6.56.118/32	10.6.56.118 – 10.6.56.118	10.6.56.118
120	10.6.56.119/32	10.6.56.119 – 10.6.56.119	10.6.56.119
121	10.6.56.120/32	10.6.56.120 – 10.6.56.120	10.6.56.120
122	10.6.56.121/32	10.6.56.121 – 10.6.56.121	10.6.56.121
123	10.6.56.122/32	10.6.56.122 – 10.6.56.122	10.6.56.122
124	10.6.56.123/32	10.6.56.123 – 10.6.56.123	10.6.56.123
125	10.6.56.124/32	10.6.56.124 – 10.6.56.124	10.6.56.124
126	10.6.56.125/32	10.6.56.125 – 10.6.56.125	10.6.56.125
127	10.6.56.126/32	10.6.56.126 – 10.6.56.126	10.6.56.126
128	10.6.56.127/32	10.6.56.127 – 10.6.56.127	10.6.56.127
129	10.6.56.128/32	10.6.56.128 – 10.6.56.128	10.6.56.128
130	10.6.56.129/32	10.6.56.129 – 10.6.56.129	10.6.56.129
131	10.6.56.130/32	10.6.56.130 – 10.6.56.130	10.6.56.130
132	10.6.56.131/32	10.6.56.131 – 10.6.56.131	10.6.56.131
133	10.6.56.132/32	10.6.56.132 – 10.6.56.132	10.6.56.132
134	10.6.56.133/32	10.6.56.133 – 10.6.56.133	10.6.56.133
135	10.6.56.134/32	10.6.56.134 – 10.6.56.134	10.6.56.134
136	10.6.56.135/32	10.6.56.135 – 10.6.56.135	10.6.56.135
137	10.6.56.136/32	10.6.56.136 – 10.6.56.136	10.6.56.136
138	10.6.56.137/32	10.6.56.137 – 10.6.56.137	10.6.56.137
139	10.6.56.138/32	10.6.56.138 – 10.6.56.138	10.6.56.138
140	10.6.56.139/32	10.6.56.139 – 10.6.56.139	10.6.56.139
141	10.6.56.140/32	10.6.56.140 – 10.6.56.140	10.6.56.140
142	10.6.56.141/32	10.6.56.141 – 10.6.56.141	10.6.56.141
143	10.6.56.142/32	10.6.56.142 – 10.6.56.142	10.6.56.142
144	10.6.56.143/32	10.6.56.143 – 10.6.56.143	10.6.56.143
145	10.6.56.144/32	10.6.56.144 – 10.6.56.144	10.6.56.144
146	10.6.56.145/32	10.6.56.145 – 10.6.56.145	10.6.56.145
147	10.6.56.146/32	10.6.56.146 – 10.6.56.146	10.6.56.146
148	10.6.56.147/32	10.6.56.147 – 10.6.56.147	10.6.56.147
149	10.6.56.148/32	10.6.56.148 – 10.6.56.148	10.6.56.148
150	10.6.56.149/32	10.6.56.149 – 10.6.56.149	10.6.56.149
151	10.6.56.150/32	10.6.56.150 – 10.6.56.150	10.6.56.150
152	10.6.56.151/32	10.6.56.151 – 10.6.56.151	10.6.56.151
153	10.6.56.152/32	10.6.56.152 – 10.6.56.152	10.6.56.152
154	10.6.56.153/32	10.6.56.153 – 10.6.56.153	10.6.56.153
155	10.6.56.154/32	10.6.56.154 – 10.6.56.154	10.6.56.154
156	10.6.56.155/32	10.6.56.155 – 10.6.56.155	10.6.56.155
157	10.6.56.156/32	10.6.56.156 – 10.6.56.156	10.6.56.156
158	10.6.56.157/32	10.6.56.157 – 10.6.56.157	10.6.56.157
159	10.6.56.158/32	10.6.56.158 – 10.6.56.158	10.6.56.158
160	10.6.56.159/32	10.6.56.159 – 10.6.56.159	10.6.56.159
161	10.6.56.160/32	10.6.56.160 – 10.6.56.160	10.6.56.160
162	10.6.56.161/32	10.6.56.161 – 10.6.56.161	10.6.56.161
163	10.6.56.162/32	10.6.56.162 – 10.6.56.162	10.6.56.162
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167	10.6.56.166/32	10.6.56.166 – 10.6.56.166	10.6.56.166
168	10.6.56.167/32	10.6.56.167 – 10.6.56.167	10.6.56.167
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170	10.6.56.169/32	10.6.56.169 – 10.6.56.169	10.6.56.169
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210	10.6.56.209/32	10.6.56.209 – 10.6.56.209	10.6.56.209
211	10.6.56.210/32	10.6.56.210 – 10.6.56.210	10.6.56.210
212	10.6.56.211/32	10.6.56.211 – 10.6.56.211	10.6.56.211
213	10.6.56.212/32	10.6.56.212 – 10.6.56.212	10.6.56.212
214	10.6.56.213/32	10.6.56.213 – 10.6.56.213	10.6.56.213
215	10.6.56.214/32	10.6.56.214 – 10.6.56.214	10.6.56.214
216	10.6.56.215/32	10.6.56.215 – 10.6.56.215	10.6.56.215
217	10.6.56.216/32	10.6.56.216 – 10.6.56.216	10.6.56.216
218	10.6.56.217/32	10.6.56.217 – 10.6.56.217	10.6.56.217
219	10.6.56.218/32	10.6.56.218 – 10.6.56.218	10.6.56.218
220	10.6.56.219/32	10.6.56.219 – 10.6.56.219	10.6.56.219
221	10.6.56.220/32	10.6.56.220 – 10.6.56.220	10.6.56.220
222	10.6.56.221/32	10.6.56.221 – 10.6.56.221	10.6.56.221
223	10.6.56.222/32	10.6.56.222 – 10.6.56.222	10.6.56.222
224	10.6.56.223/32	10.6.56.223 – 10.6.56.223	10.6.56.223
225	10.6.56.224/32	10.6.56.224 – 10.6.56.224	10.6.56.224
226	10.6.56.225/32	10.6.56.225 – 10.6.56.225	10.6.56.225
227	10.6.56.226/32	10.6.56.226 – 10.6.56.226	10.6.56.226
228	10.6.56.227/32	10.6.56.227 – 10.6.56.227	10.6.56.227
229	10.6.56.228/32	10.6.56.228 – 10.6.56.228	10.6.56.228
230	10.6.56.229/32	10.6.56.229 – 10.6.56.229	10.6.56.229
231	10.6.56.230/32	10.6.56.230 – 10.6.56.230	10.6.56.230
232	10.6.56.231/32	10.6.56.231 – 10.6.56.231	10.6.56.231
233	10.6.56.232/32	10.6.56.232 – 10.6.56.232	10.6.56.232
234	10.6.56.233/32	10.6.56.233 – 10.6.56.233	10.6.56.233
235	10.6.56.234/32	10.6.56.234 – 10.6.56.234	10.6.56.234
236	10.6.56.235/32	10.6.56.235 – 10.6.56.235	10.6.56.235
237	10.6.56.236/32	10.6.56.236 – 10.6.56.236	10.6.56.236
238	10.6.56.237/32	10.6.56.237 – 10.6.56.237	10.6.56.237
239	10.6.56.238/32	10.6.56.238 – 10.6.56.238	10.6.56.238
240	10.6.56.239/32	10.6.56.239 – 10.6.56.239	10.6.56.239
241	10.6.56.240/32	10.6.56.240 – 10.6.56.240	10.6.56.240
242	10.6.56.241/32	10.6.56.241 – 10.6.56.241	10.6.56.241
243	10.6.56.242/32	10.6.56.242 – 10.6.56.242	10.6.56.242
244	10.6.56.243/32	10.6.56.243 – 10.6.56.243	10.6.56.243
245	10.6.56.244/32	10.6.56.244 – 10.6.56.244	10.6.56.244
246	10.6.56.245/32	10.6.56.245 – 10.6.56.245	10.6.56.245
247	10.6.56.246/32	10.6.56.246 – 10.6.56.246	10.6.56.246
248	10.6.56.247/32	10.6.56.247 – 10.6.56.247	10.6.56.247
249	10.6.56.248/32	10.6.56.248 – 10.6.56.248	10.6.56.248
250	10.6.56.249/32	10.6.56.249 – 10.6.56.249	10.6.56.249
251	10.6.56.250/32	10.6.56.250 – 10.6.56.250	10.6.56.250
252	10.6.56.251/32	10.6.56.251 – 10.6.56.251	10.6.56.251
253	10.6.56.252/32	10.6.56.252 – 10.6.56.252	10.6.56.252
254	10.6.56.253/32	10.6.56.253 – 10.6.56.253	10.6.56.253
255	10.6.56.254/32	10.6.56.254 – 10.6.56.254	10.6.56.254
256	10.6.56.255/32	10.6.56.255 – 10.6.56.255	10.6.56.255

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 →