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)10.0.88.0/21

network10.0.88.0/21

broadcast10.0.95.255

first host10.0.88.1

last host10.0.95.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.88.0/21

address00001010.00000000.01011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.01011000.00000000

broadcast00001010.00000000.01011111.11111111

green = network part, grey = host part

hex0x0a005800

decimal167794688

reverse dns0.88.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:5800

/21 split into /32 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.0.88.0/32	10.0.88.0 – 10.0.88.0	10.0.88.0
2	10.0.88.1/32	10.0.88.1 – 10.0.88.1	10.0.88.1
3	10.0.88.2/32	10.0.88.2 – 10.0.88.2	10.0.88.2
4	10.0.88.3/32	10.0.88.3 – 10.0.88.3	10.0.88.3
5	10.0.88.4/32	10.0.88.4 – 10.0.88.4	10.0.88.4
6	10.0.88.5/32	10.0.88.5 – 10.0.88.5	10.0.88.5
7	10.0.88.6/32	10.0.88.6 – 10.0.88.6	10.0.88.6
8	10.0.88.7/32	10.0.88.7 – 10.0.88.7	10.0.88.7
9	10.0.88.8/32	10.0.88.8 – 10.0.88.8	10.0.88.8
10	10.0.88.9/32	10.0.88.9 – 10.0.88.9	10.0.88.9
11	10.0.88.10/32	10.0.88.10 – 10.0.88.10	10.0.88.10
12	10.0.88.11/32	10.0.88.11 – 10.0.88.11	10.0.88.11
13	10.0.88.12/32	10.0.88.12 – 10.0.88.12	10.0.88.12
14	10.0.88.13/32	10.0.88.13 – 10.0.88.13	10.0.88.13
15	10.0.88.14/32	10.0.88.14 – 10.0.88.14	10.0.88.14
16	10.0.88.15/32	10.0.88.15 – 10.0.88.15	10.0.88.15
17	10.0.88.16/32	10.0.88.16 – 10.0.88.16	10.0.88.16
18	10.0.88.17/32	10.0.88.17 – 10.0.88.17	10.0.88.17
19	10.0.88.18/32	10.0.88.18 – 10.0.88.18	10.0.88.18
20	10.0.88.19/32	10.0.88.19 – 10.0.88.19	10.0.88.19
21	10.0.88.20/32	10.0.88.20 – 10.0.88.20	10.0.88.20
22	10.0.88.21/32	10.0.88.21 – 10.0.88.21	10.0.88.21
23	10.0.88.22/32	10.0.88.22 – 10.0.88.22	10.0.88.22
24	10.0.88.23/32	10.0.88.23 – 10.0.88.23	10.0.88.23
25	10.0.88.24/32	10.0.88.24 – 10.0.88.24	10.0.88.24
26	10.0.88.25/32	10.0.88.25 – 10.0.88.25	10.0.88.25
27	10.0.88.26/32	10.0.88.26 – 10.0.88.26	10.0.88.26
28	10.0.88.27/32	10.0.88.27 – 10.0.88.27	10.0.88.27
29	10.0.88.28/32	10.0.88.28 – 10.0.88.28	10.0.88.28
30	10.0.88.29/32	10.0.88.29 – 10.0.88.29	10.0.88.29
31	10.0.88.30/32	10.0.88.30 – 10.0.88.30	10.0.88.30
32	10.0.88.31/32	10.0.88.31 – 10.0.88.31	10.0.88.31
33	10.0.88.32/32	10.0.88.32 – 10.0.88.32	10.0.88.32
34	10.0.88.33/32	10.0.88.33 – 10.0.88.33	10.0.88.33
35	10.0.88.34/32	10.0.88.34 – 10.0.88.34	10.0.88.34
36	10.0.88.35/32	10.0.88.35 – 10.0.88.35	10.0.88.35
37	10.0.88.36/32	10.0.88.36 – 10.0.88.36	10.0.88.36
38	10.0.88.37/32	10.0.88.37 – 10.0.88.37	10.0.88.37
39	10.0.88.38/32	10.0.88.38 – 10.0.88.38	10.0.88.38
40	10.0.88.39/32	10.0.88.39 – 10.0.88.39	10.0.88.39
41	10.0.88.40/32	10.0.88.40 – 10.0.88.40	10.0.88.40
42	10.0.88.41/32	10.0.88.41 – 10.0.88.41	10.0.88.41
43	10.0.88.42/32	10.0.88.42 – 10.0.88.42	10.0.88.42
44	10.0.88.43/32	10.0.88.43 – 10.0.88.43	10.0.88.43
45	10.0.88.44/32	10.0.88.44 – 10.0.88.44	10.0.88.44
46	10.0.88.45/32	10.0.88.45 – 10.0.88.45	10.0.88.45
47	10.0.88.46/32	10.0.88.46 – 10.0.88.46	10.0.88.46
48	10.0.88.47/32	10.0.88.47 – 10.0.88.47	10.0.88.47
49	10.0.88.48/32	10.0.88.48 – 10.0.88.48	10.0.88.48
50	10.0.88.49/32	10.0.88.49 – 10.0.88.49	10.0.88.49
51	10.0.88.50/32	10.0.88.50 – 10.0.88.50	10.0.88.50
52	10.0.88.51/32	10.0.88.51 – 10.0.88.51	10.0.88.51
53	10.0.88.52/32	10.0.88.52 – 10.0.88.52	10.0.88.52
54	10.0.88.53/32	10.0.88.53 – 10.0.88.53	10.0.88.53
55	10.0.88.54/32	10.0.88.54 – 10.0.88.54	10.0.88.54
56	10.0.88.55/32	10.0.88.55 – 10.0.88.55	10.0.88.55
57	10.0.88.56/32	10.0.88.56 – 10.0.88.56	10.0.88.56
58	10.0.88.57/32	10.0.88.57 – 10.0.88.57	10.0.88.57
59	10.0.88.58/32	10.0.88.58 – 10.0.88.58	10.0.88.58
60	10.0.88.59/32	10.0.88.59 – 10.0.88.59	10.0.88.59
61	10.0.88.60/32	10.0.88.60 – 10.0.88.60	10.0.88.60
62	10.0.88.61/32	10.0.88.61 – 10.0.88.61	10.0.88.61
63	10.0.88.62/32	10.0.88.62 – 10.0.88.62	10.0.88.62
64	10.0.88.63/32	10.0.88.63 – 10.0.88.63	10.0.88.63
65	10.0.88.64/32	10.0.88.64 – 10.0.88.64	10.0.88.64
66	10.0.88.65/32	10.0.88.65 – 10.0.88.65	10.0.88.65
67	10.0.88.66/32	10.0.88.66 – 10.0.88.66	10.0.88.66
68	10.0.88.67/32	10.0.88.67 – 10.0.88.67	10.0.88.67
69	10.0.88.68/32	10.0.88.68 – 10.0.88.68	10.0.88.68
70	10.0.88.69/32	10.0.88.69 – 10.0.88.69	10.0.88.69
71	10.0.88.70/32	10.0.88.70 – 10.0.88.70	10.0.88.70
72	10.0.88.71/32	10.0.88.71 – 10.0.88.71	10.0.88.71
73	10.0.88.72/32	10.0.88.72 – 10.0.88.72	10.0.88.72
74	10.0.88.73/32	10.0.88.73 – 10.0.88.73	10.0.88.73
75	10.0.88.74/32	10.0.88.74 – 10.0.88.74	10.0.88.74
76	10.0.88.75/32	10.0.88.75 – 10.0.88.75	10.0.88.75
77	10.0.88.76/32	10.0.88.76 – 10.0.88.76	10.0.88.76
78	10.0.88.77/32	10.0.88.77 – 10.0.88.77	10.0.88.77
79	10.0.88.78/32	10.0.88.78 – 10.0.88.78	10.0.88.78
80	10.0.88.79/32	10.0.88.79 – 10.0.88.79	10.0.88.79
81	10.0.88.80/32	10.0.88.80 – 10.0.88.80	10.0.88.80
82	10.0.88.81/32	10.0.88.81 – 10.0.88.81	10.0.88.81
83	10.0.88.82/32	10.0.88.82 – 10.0.88.82	10.0.88.82
84	10.0.88.83/32	10.0.88.83 – 10.0.88.83	10.0.88.83
85	10.0.88.84/32	10.0.88.84 – 10.0.88.84	10.0.88.84
86	10.0.88.85/32	10.0.88.85 – 10.0.88.85	10.0.88.85
87	10.0.88.86/32	10.0.88.86 – 10.0.88.86	10.0.88.86
88	10.0.88.87/32	10.0.88.87 – 10.0.88.87	10.0.88.87
89	10.0.88.88/32	10.0.88.88 – 10.0.88.88	10.0.88.88
90	10.0.88.89/32	10.0.88.89 – 10.0.88.89	10.0.88.89
91	10.0.88.90/32	10.0.88.90 – 10.0.88.90	10.0.88.90
92	10.0.88.91/32	10.0.88.91 – 10.0.88.91	10.0.88.91
93	10.0.88.92/32	10.0.88.92 – 10.0.88.92	10.0.88.92
94	10.0.88.93/32	10.0.88.93 – 10.0.88.93	10.0.88.93
95	10.0.88.94/32	10.0.88.94 – 10.0.88.94	10.0.88.94
96	10.0.88.95/32	10.0.88.95 – 10.0.88.95	10.0.88.95
97	10.0.88.96/32	10.0.88.96 – 10.0.88.96	10.0.88.96
98	10.0.88.97/32	10.0.88.97 – 10.0.88.97	10.0.88.97
99	10.0.88.98/32	10.0.88.98 – 10.0.88.98	10.0.88.98
100	10.0.88.99/32	10.0.88.99 – 10.0.88.99	10.0.88.99
101	10.0.88.100/32	10.0.88.100 – 10.0.88.100	10.0.88.100
102	10.0.88.101/32	10.0.88.101 – 10.0.88.101	10.0.88.101
103	10.0.88.102/32	10.0.88.102 – 10.0.88.102	10.0.88.102
104	10.0.88.103/32	10.0.88.103 – 10.0.88.103	10.0.88.103
105	10.0.88.104/32	10.0.88.104 – 10.0.88.104	10.0.88.104
106	10.0.88.105/32	10.0.88.105 – 10.0.88.105	10.0.88.105
107	10.0.88.106/32	10.0.88.106 – 10.0.88.106	10.0.88.106
108	10.0.88.107/32	10.0.88.107 – 10.0.88.107	10.0.88.107
109	10.0.88.108/32	10.0.88.108 – 10.0.88.108	10.0.88.108
110	10.0.88.109/32	10.0.88.109 – 10.0.88.109	10.0.88.109
111	10.0.88.110/32	10.0.88.110 – 10.0.88.110	10.0.88.110
112	10.0.88.111/32	10.0.88.111 – 10.0.88.111	10.0.88.111
113	10.0.88.112/32	10.0.88.112 – 10.0.88.112	10.0.88.112
114	10.0.88.113/32	10.0.88.113 – 10.0.88.113	10.0.88.113
115	10.0.88.114/32	10.0.88.114 – 10.0.88.114	10.0.88.114
116	10.0.88.115/32	10.0.88.115 – 10.0.88.115	10.0.88.115
117	10.0.88.116/32	10.0.88.116 – 10.0.88.116	10.0.88.116
118	10.0.88.117/32	10.0.88.117 – 10.0.88.117	10.0.88.117
119	10.0.88.118/32	10.0.88.118 – 10.0.88.118	10.0.88.118
120	10.0.88.119/32	10.0.88.119 – 10.0.88.119	10.0.88.119
121	10.0.88.120/32	10.0.88.120 – 10.0.88.120	10.0.88.120
122	10.0.88.121/32	10.0.88.121 – 10.0.88.121	10.0.88.121
123	10.0.88.122/32	10.0.88.122 – 10.0.88.122	10.0.88.122
124	10.0.88.123/32	10.0.88.123 – 10.0.88.123	10.0.88.123
125	10.0.88.124/32	10.0.88.124 – 10.0.88.124	10.0.88.124
126	10.0.88.125/32	10.0.88.125 – 10.0.88.125	10.0.88.125
127	10.0.88.126/32	10.0.88.126 – 10.0.88.126	10.0.88.126
128	10.0.88.127/32	10.0.88.127 – 10.0.88.127	10.0.88.127
129	10.0.88.128/32	10.0.88.128 – 10.0.88.128	10.0.88.128
130	10.0.88.129/32	10.0.88.129 – 10.0.88.129	10.0.88.129
131	10.0.88.130/32	10.0.88.130 – 10.0.88.130	10.0.88.130
132	10.0.88.131/32	10.0.88.131 – 10.0.88.131	10.0.88.131
133	10.0.88.132/32	10.0.88.132 – 10.0.88.132	10.0.88.132
134	10.0.88.133/32	10.0.88.133 – 10.0.88.133	10.0.88.133
135	10.0.88.134/32	10.0.88.134 – 10.0.88.134	10.0.88.134
136	10.0.88.135/32	10.0.88.135 – 10.0.88.135	10.0.88.135
137	10.0.88.136/32	10.0.88.136 – 10.0.88.136	10.0.88.136
138	10.0.88.137/32	10.0.88.137 – 10.0.88.137	10.0.88.137
139	10.0.88.138/32	10.0.88.138 – 10.0.88.138	10.0.88.138
140	10.0.88.139/32	10.0.88.139 – 10.0.88.139	10.0.88.139
141	10.0.88.140/32	10.0.88.140 – 10.0.88.140	10.0.88.140
142	10.0.88.141/32	10.0.88.141 – 10.0.88.141	10.0.88.141
143	10.0.88.142/32	10.0.88.142 – 10.0.88.142	10.0.88.142
144	10.0.88.143/32	10.0.88.143 – 10.0.88.143	10.0.88.143
145	10.0.88.144/32	10.0.88.144 – 10.0.88.144	10.0.88.144
146	10.0.88.145/32	10.0.88.145 – 10.0.88.145	10.0.88.145
147	10.0.88.146/32	10.0.88.146 – 10.0.88.146	10.0.88.146
148	10.0.88.147/32	10.0.88.147 – 10.0.88.147	10.0.88.147
149	10.0.88.148/32	10.0.88.148 – 10.0.88.148	10.0.88.148
150	10.0.88.149/32	10.0.88.149 – 10.0.88.149	10.0.88.149
151	10.0.88.150/32	10.0.88.150 – 10.0.88.150	10.0.88.150
152	10.0.88.151/32	10.0.88.151 – 10.0.88.151	10.0.88.151
153	10.0.88.152/32	10.0.88.152 – 10.0.88.152	10.0.88.152
154	10.0.88.153/32	10.0.88.153 – 10.0.88.153	10.0.88.153
155	10.0.88.154/32	10.0.88.154 – 10.0.88.154	10.0.88.154
156	10.0.88.155/32	10.0.88.155 – 10.0.88.155	10.0.88.155
157	10.0.88.156/32	10.0.88.156 – 10.0.88.156	10.0.88.156
158	10.0.88.157/32	10.0.88.157 – 10.0.88.157	10.0.88.157
159	10.0.88.158/32	10.0.88.158 – 10.0.88.158	10.0.88.158
160	10.0.88.159/32	10.0.88.159 – 10.0.88.159	10.0.88.159
161	10.0.88.160/32	10.0.88.160 – 10.0.88.160	10.0.88.160
162	10.0.88.161/32	10.0.88.161 – 10.0.88.161	10.0.88.161
163	10.0.88.162/32	10.0.88.162 – 10.0.88.162	10.0.88.162
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210	10.0.88.209/32	10.0.88.209 – 10.0.88.209	10.0.88.209
211	10.0.88.210/32	10.0.88.210 – 10.0.88.210	10.0.88.210
212	10.0.88.211/32	10.0.88.211 – 10.0.88.211	10.0.88.211
213	10.0.88.212/32	10.0.88.212 – 10.0.88.212	10.0.88.212
214	10.0.88.213/32	10.0.88.213 – 10.0.88.213	10.0.88.213
215	10.0.88.214/32	10.0.88.214 – 10.0.88.214	10.0.88.214
216	10.0.88.215/32	10.0.88.215 – 10.0.88.215	10.0.88.215
217	10.0.88.216/32	10.0.88.216 – 10.0.88.216	10.0.88.216
218	10.0.88.217/32	10.0.88.217 – 10.0.88.217	10.0.88.217
219	10.0.88.218/32	10.0.88.218 – 10.0.88.218	10.0.88.218
220	10.0.88.219/32	10.0.88.219 – 10.0.88.219	10.0.88.219
221	10.0.88.220/32	10.0.88.220 – 10.0.88.220	10.0.88.220
222	10.0.88.221/32	10.0.88.221 – 10.0.88.221	10.0.88.221
223	10.0.88.222/32	10.0.88.222 – 10.0.88.222	10.0.88.222
224	10.0.88.223/32	10.0.88.223 – 10.0.88.223	10.0.88.223
225	10.0.88.224/32	10.0.88.224 – 10.0.88.224	10.0.88.224
226	10.0.88.225/32	10.0.88.225 – 10.0.88.225	10.0.88.225
227	10.0.88.226/32	10.0.88.226 – 10.0.88.226	10.0.88.226
228	10.0.88.227/32	10.0.88.227 – 10.0.88.227	10.0.88.227
229	10.0.88.228/32	10.0.88.228 – 10.0.88.228	10.0.88.228
230	10.0.88.229/32	10.0.88.229 – 10.0.88.229	10.0.88.229
231	10.0.88.230/32	10.0.88.230 – 10.0.88.230	10.0.88.230
232	10.0.88.231/32	10.0.88.231 – 10.0.88.231	10.0.88.231
233	10.0.88.232/32	10.0.88.232 – 10.0.88.232	10.0.88.232
234	10.0.88.233/32	10.0.88.233 – 10.0.88.233	10.0.88.233
235	10.0.88.234/32	10.0.88.234 – 10.0.88.234	10.0.88.234
236	10.0.88.235/32	10.0.88.235 – 10.0.88.235	10.0.88.235
237	10.0.88.236/32	10.0.88.236 – 10.0.88.236	10.0.88.236
238	10.0.88.237/32	10.0.88.237 – 10.0.88.237	10.0.88.237
239	10.0.88.238/32	10.0.88.238 – 10.0.88.238	10.0.88.238
240	10.0.88.239/32	10.0.88.239 – 10.0.88.239	10.0.88.239
241	10.0.88.240/32	10.0.88.240 – 10.0.88.240	10.0.88.240
242	10.0.88.241/32	10.0.88.241 – 10.0.88.241	10.0.88.241
243	10.0.88.242/32	10.0.88.242 – 10.0.88.242	10.0.88.242
244	10.0.88.243/32	10.0.88.243 – 10.0.88.243	10.0.88.243
245	10.0.88.244/32	10.0.88.244 – 10.0.88.244	10.0.88.244
246	10.0.88.245/32	10.0.88.245 – 10.0.88.245	10.0.88.245
247	10.0.88.246/32	10.0.88.246 – 10.0.88.246	10.0.88.246
248	10.0.88.247/32	10.0.88.247 – 10.0.88.247	10.0.88.247
249	10.0.88.248/32	10.0.88.248 – 10.0.88.248	10.0.88.248
250	10.0.88.249/32	10.0.88.249 – 10.0.88.249	10.0.88.249
251	10.0.88.250/32	10.0.88.250 – 10.0.88.250	10.0.88.250
252	10.0.88.251/32	10.0.88.251 – 10.0.88.251	10.0.88.251
253	10.0.88.252/32	10.0.88.252 – 10.0.88.252	10.0.88.252
254	10.0.88.253/32	10.0.88.253 – 10.0.88.253	10.0.88.253
255	10.0.88.254/32	10.0.88.254 – 10.0.88.254	10.0.88.254
256	10.0.88.255/32	10.0.88.255 – 10.0.88.255	10.0.88.255

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 →