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)10.4.88.0/21

network10.4.88.0/21

broadcast10.4.95.255

first host10.4.88.1

last host10.4.95.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.88.0/21

address00001010.00000100.01011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.01011000.00000000

broadcast00001010.00000100.01011111.11111111

green = network part, grey = host part

hex0x0a045800

decimal168056832

reverse dns0.88.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:5800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.88.0/31	10.4.88.0 – 10.4.88.1	10.4.88.1
2	10.4.88.2/31	10.4.88.2 – 10.4.88.3	10.4.88.3
3	10.4.88.4/31	10.4.88.4 – 10.4.88.5	10.4.88.5
4	10.4.88.6/31	10.4.88.6 – 10.4.88.7	10.4.88.7
5	10.4.88.8/31	10.4.88.8 – 10.4.88.9	10.4.88.9
6	10.4.88.10/31	10.4.88.10 – 10.4.88.11	10.4.88.11
7	10.4.88.12/31	10.4.88.12 – 10.4.88.13	10.4.88.13
8	10.4.88.14/31	10.4.88.14 – 10.4.88.15	10.4.88.15
9	10.4.88.16/31	10.4.88.16 – 10.4.88.17	10.4.88.17
10	10.4.88.18/31	10.4.88.18 – 10.4.88.19	10.4.88.19
11	10.4.88.20/31	10.4.88.20 – 10.4.88.21	10.4.88.21
12	10.4.88.22/31	10.4.88.22 – 10.4.88.23	10.4.88.23
13	10.4.88.24/31	10.4.88.24 – 10.4.88.25	10.4.88.25
14	10.4.88.26/31	10.4.88.26 – 10.4.88.27	10.4.88.27
15	10.4.88.28/31	10.4.88.28 – 10.4.88.29	10.4.88.29
16	10.4.88.30/31	10.4.88.30 – 10.4.88.31	10.4.88.31
17	10.4.88.32/31	10.4.88.32 – 10.4.88.33	10.4.88.33
18	10.4.88.34/31	10.4.88.34 – 10.4.88.35	10.4.88.35
19	10.4.88.36/31	10.4.88.36 – 10.4.88.37	10.4.88.37
20	10.4.88.38/31	10.4.88.38 – 10.4.88.39	10.4.88.39
21	10.4.88.40/31	10.4.88.40 – 10.4.88.41	10.4.88.41
22	10.4.88.42/31	10.4.88.42 – 10.4.88.43	10.4.88.43
23	10.4.88.44/31	10.4.88.44 – 10.4.88.45	10.4.88.45
24	10.4.88.46/31	10.4.88.46 – 10.4.88.47	10.4.88.47
25	10.4.88.48/31	10.4.88.48 – 10.4.88.49	10.4.88.49
26	10.4.88.50/31	10.4.88.50 – 10.4.88.51	10.4.88.51
27	10.4.88.52/31	10.4.88.52 – 10.4.88.53	10.4.88.53
28	10.4.88.54/31	10.4.88.54 – 10.4.88.55	10.4.88.55
29	10.4.88.56/31	10.4.88.56 – 10.4.88.57	10.4.88.57
30	10.4.88.58/31	10.4.88.58 – 10.4.88.59	10.4.88.59
31	10.4.88.60/31	10.4.88.60 – 10.4.88.61	10.4.88.61
32	10.4.88.62/31	10.4.88.62 – 10.4.88.63	10.4.88.63
33	10.4.88.64/31	10.4.88.64 – 10.4.88.65	10.4.88.65
34	10.4.88.66/31	10.4.88.66 – 10.4.88.67	10.4.88.67
35	10.4.88.68/31	10.4.88.68 – 10.4.88.69	10.4.88.69
36	10.4.88.70/31	10.4.88.70 – 10.4.88.71	10.4.88.71
37	10.4.88.72/31	10.4.88.72 – 10.4.88.73	10.4.88.73
38	10.4.88.74/31	10.4.88.74 – 10.4.88.75	10.4.88.75
39	10.4.88.76/31	10.4.88.76 – 10.4.88.77	10.4.88.77
40	10.4.88.78/31	10.4.88.78 – 10.4.88.79	10.4.88.79
41	10.4.88.80/31	10.4.88.80 – 10.4.88.81	10.4.88.81
42	10.4.88.82/31	10.4.88.82 – 10.4.88.83	10.4.88.83
43	10.4.88.84/31	10.4.88.84 – 10.4.88.85	10.4.88.85
44	10.4.88.86/31	10.4.88.86 – 10.4.88.87	10.4.88.87
45	10.4.88.88/31	10.4.88.88 – 10.4.88.89	10.4.88.89
46	10.4.88.90/31	10.4.88.90 – 10.4.88.91	10.4.88.91
47	10.4.88.92/31	10.4.88.92 – 10.4.88.93	10.4.88.93
48	10.4.88.94/31	10.4.88.94 – 10.4.88.95	10.4.88.95
49	10.4.88.96/31	10.4.88.96 – 10.4.88.97	10.4.88.97
50	10.4.88.98/31	10.4.88.98 – 10.4.88.99	10.4.88.99
51	10.4.88.100/31	10.4.88.100 – 10.4.88.101	10.4.88.101
52	10.4.88.102/31	10.4.88.102 – 10.4.88.103	10.4.88.103
53	10.4.88.104/31	10.4.88.104 – 10.4.88.105	10.4.88.105
54	10.4.88.106/31	10.4.88.106 – 10.4.88.107	10.4.88.107
55	10.4.88.108/31	10.4.88.108 – 10.4.88.109	10.4.88.109
56	10.4.88.110/31	10.4.88.110 – 10.4.88.111	10.4.88.111
57	10.4.88.112/31	10.4.88.112 – 10.4.88.113	10.4.88.113
58	10.4.88.114/31	10.4.88.114 – 10.4.88.115	10.4.88.115
59	10.4.88.116/31	10.4.88.116 – 10.4.88.117	10.4.88.117
60	10.4.88.118/31	10.4.88.118 – 10.4.88.119	10.4.88.119
61	10.4.88.120/31	10.4.88.120 – 10.4.88.121	10.4.88.121
62	10.4.88.122/31	10.4.88.122 – 10.4.88.123	10.4.88.123
63	10.4.88.124/31	10.4.88.124 – 10.4.88.125	10.4.88.125
64	10.4.88.126/31	10.4.88.126 – 10.4.88.127	10.4.88.127
65	10.4.88.128/31	10.4.88.128 – 10.4.88.129	10.4.88.129
66	10.4.88.130/31	10.4.88.130 – 10.4.88.131	10.4.88.131
67	10.4.88.132/31	10.4.88.132 – 10.4.88.133	10.4.88.133
68	10.4.88.134/31	10.4.88.134 – 10.4.88.135	10.4.88.135
69	10.4.88.136/31	10.4.88.136 – 10.4.88.137	10.4.88.137
70	10.4.88.138/31	10.4.88.138 – 10.4.88.139	10.4.88.139
71	10.4.88.140/31	10.4.88.140 – 10.4.88.141	10.4.88.141
72	10.4.88.142/31	10.4.88.142 – 10.4.88.143	10.4.88.143
73	10.4.88.144/31	10.4.88.144 – 10.4.88.145	10.4.88.145
74	10.4.88.146/31	10.4.88.146 – 10.4.88.147	10.4.88.147
75	10.4.88.148/31	10.4.88.148 – 10.4.88.149	10.4.88.149
76	10.4.88.150/31	10.4.88.150 – 10.4.88.151	10.4.88.151
77	10.4.88.152/31	10.4.88.152 – 10.4.88.153	10.4.88.153
78	10.4.88.154/31	10.4.88.154 – 10.4.88.155	10.4.88.155
79	10.4.88.156/31	10.4.88.156 – 10.4.88.157	10.4.88.157
80	10.4.88.158/31	10.4.88.158 – 10.4.88.159	10.4.88.159
81	10.4.88.160/31	10.4.88.160 – 10.4.88.161	10.4.88.161
82	10.4.88.162/31	10.4.88.162 – 10.4.88.163	10.4.88.163
83	10.4.88.164/31	10.4.88.164 – 10.4.88.165	10.4.88.165
84	10.4.88.166/31	10.4.88.166 – 10.4.88.167	10.4.88.167
85	10.4.88.168/31	10.4.88.168 – 10.4.88.169	10.4.88.169
86	10.4.88.170/31	10.4.88.170 – 10.4.88.171	10.4.88.171
87	10.4.88.172/31	10.4.88.172 – 10.4.88.173	10.4.88.173
88	10.4.88.174/31	10.4.88.174 – 10.4.88.175	10.4.88.175
89	10.4.88.176/31	10.4.88.176 – 10.4.88.177	10.4.88.177
90	10.4.88.178/31	10.4.88.178 – 10.4.88.179	10.4.88.179
91	10.4.88.180/31	10.4.88.180 – 10.4.88.181	10.4.88.181
92	10.4.88.182/31	10.4.88.182 – 10.4.88.183	10.4.88.183
93	10.4.88.184/31	10.4.88.184 – 10.4.88.185	10.4.88.185
94	10.4.88.186/31	10.4.88.186 – 10.4.88.187	10.4.88.187
95	10.4.88.188/31	10.4.88.188 – 10.4.88.189	10.4.88.189
96	10.4.88.190/31	10.4.88.190 – 10.4.88.191	10.4.88.191
97	10.4.88.192/31	10.4.88.192 – 10.4.88.193	10.4.88.193
98	10.4.88.194/31	10.4.88.194 – 10.4.88.195	10.4.88.195
99	10.4.88.196/31	10.4.88.196 – 10.4.88.197	10.4.88.197
100	10.4.88.198/31	10.4.88.198 – 10.4.88.199	10.4.88.199
101	10.4.88.200/31	10.4.88.200 – 10.4.88.201	10.4.88.201
102	10.4.88.202/31	10.4.88.202 – 10.4.88.203	10.4.88.203
103	10.4.88.204/31	10.4.88.204 – 10.4.88.205	10.4.88.205
104	10.4.88.206/31	10.4.88.206 – 10.4.88.207	10.4.88.207
105	10.4.88.208/31	10.4.88.208 – 10.4.88.209	10.4.88.209
106	10.4.88.210/31	10.4.88.210 – 10.4.88.211	10.4.88.211
107	10.4.88.212/31	10.4.88.212 – 10.4.88.213	10.4.88.213
108	10.4.88.214/31	10.4.88.214 – 10.4.88.215	10.4.88.215
109	10.4.88.216/31	10.4.88.216 – 10.4.88.217	10.4.88.217
110	10.4.88.218/31	10.4.88.218 – 10.4.88.219	10.4.88.219
111	10.4.88.220/31	10.4.88.220 – 10.4.88.221	10.4.88.221
112	10.4.88.222/31	10.4.88.222 – 10.4.88.223	10.4.88.223
113	10.4.88.224/31	10.4.88.224 – 10.4.88.225	10.4.88.225
114	10.4.88.226/31	10.4.88.226 – 10.4.88.227	10.4.88.227
115	10.4.88.228/31	10.4.88.228 – 10.4.88.229	10.4.88.229
116	10.4.88.230/31	10.4.88.230 – 10.4.88.231	10.4.88.231
117	10.4.88.232/31	10.4.88.232 – 10.4.88.233	10.4.88.233
118	10.4.88.234/31	10.4.88.234 – 10.4.88.235	10.4.88.235
119	10.4.88.236/31	10.4.88.236 – 10.4.88.237	10.4.88.237
120	10.4.88.238/31	10.4.88.238 – 10.4.88.239	10.4.88.239
121	10.4.88.240/31	10.4.88.240 – 10.4.88.241	10.4.88.241
122	10.4.88.242/31	10.4.88.242 – 10.4.88.243	10.4.88.243
123	10.4.88.244/31	10.4.88.244 – 10.4.88.245	10.4.88.245
124	10.4.88.246/31	10.4.88.246 – 10.4.88.247	10.4.88.247
125	10.4.88.248/31	10.4.88.248 – 10.4.88.249	10.4.88.249
126	10.4.88.250/31	10.4.88.250 – 10.4.88.251	10.4.88.251
127	10.4.88.252/31	10.4.88.252 – 10.4.88.253	10.4.88.253
128	10.4.88.254/31	10.4.88.254 – 10.4.88.255	10.4.88.255
129	10.4.89.0/31	10.4.89.0 – 10.4.89.1	10.4.89.1
130	10.4.89.2/31	10.4.89.2 – 10.4.89.3	10.4.89.3
131	10.4.89.4/31	10.4.89.4 – 10.4.89.5	10.4.89.5
132	10.4.89.6/31	10.4.89.6 – 10.4.89.7	10.4.89.7
133	10.4.89.8/31	10.4.89.8 – 10.4.89.9	10.4.89.9
134	10.4.89.10/31	10.4.89.10 – 10.4.89.11	10.4.89.11
135	10.4.89.12/31	10.4.89.12 – 10.4.89.13	10.4.89.13
136	10.4.89.14/31	10.4.89.14 – 10.4.89.15	10.4.89.15
137	10.4.89.16/31	10.4.89.16 – 10.4.89.17	10.4.89.17
138	10.4.89.18/31	10.4.89.18 – 10.4.89.19	10.4.89.19
139	10.4.89.20/31	10.4.89.20 – 10.4.89.21	10.4.89.21
140	10.4.89.22/31	10.4.89.22 – 10.4.89.23	10.4.89.23
141	10.4.89.24/31	10.4.89.24 – 10.4.89.25	10.4.89.25
142	10.4.89.26/31	10.4.89.26 – 10.4.89.27	10.4.89.27
143	10.4.89.28/31	10.4.89.28 – 10.4.89.29	10.4.89.29
144	10.4.89.30/31	10.4.89.30 – 10.4.89.31	10.4.89.31
145	10.4.89.32/31	10.4.89.32 – 10.4.89.33	10.4.89.33
146	10.4.89.34/31	10.4.89.34 – 10.4.89.35	10.4.89.35
147	10.4.89.36/31	10.4.89.36 – 10.4.89.37	10.4.89.37
148	10.4.89.38/31	10.4.89.38 – 10.4.89.39	10.4.89.39
149	10.4.89.40/31	10.4.89.40 – 10.4.89.41	10.4.89.41
150	10.4.89.42/31	10.4.89.42 – 10.4.89.43	10.4.89.43
151	10.4.89.44/31	10.4.89.44 – 10.4.89.45	10.4.89.45
152	10.4.89.46/31	10.4.89.46 – 10.4.89.47	10.4.89.47
153	10.4.89.48/31	10.4.89.48 – 10.4.89.49	10.4.89.49
154	10.4.89.50/31	10.4.89.50 – 10.4.89.51	10.4.89.51
155	10.4.89.52/31	10.4.89.52 – 10.4.89.53	10.4.89.53
156	10.4.89.54/31	10.4.89.54 – 10.4.89.55	10.4.89.55
157	10.4.89.56/31	10.4.89.56 – 10.4.89.57	10.4.89.57
158	10.4.89.58/31	10.4.89.58 – 10.4.89.59	10.4.89.59
159	10.4.89.60/31	10.4.89.60 – 10.4.89.61	10.4.89.61
160	10.4.89.62/31	10.4.89.62 – 10.4.89.63	10.4.89.63
161	10.4.89.64/31	10.4.89.64 – 10.4.89.65	10.4.89.65
162	10.4.89.66/31	10.4.89.66 – 10.4.89.67	10.4.89.67
163	10.4.89.68/31	10.4.89.68 – 10.4.89.69	10.4.89.69
164	10.4.89.70/31	10.4.89.70 – 10.4.89.71	10.4.89.71
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210	10.4.89.162/31	10.4.89.162 – 10.4.89.163	10.4.89.163
211	10.4.89.164/31	10.4.89.164 – 10.4.89.165	10.4.89.165
212	10.4.89.166/31	10.4.89.166 – 10.4.89.167	10.4.89.167
213	10.4.89.168/31	10.4.89.168 – 10.4.89.169	10.4.89.169
214	10.4.89.170/31	10.4.89.170 – 10.4.89.171	10.4.89.171
215	10.4.89.172/31	10.4.89.172 – 10.4.89.173	10.4.89.173
216	10.4.89.174/31	10.4.89.174 – 10.4.89.175	10.4.89.175
217	10.4.89.176/31	10.4.89.176 – 10.4.89.177	10.4.89.177
218	10.4.89.178/31	10.4.89.178 – 10.4.89.179	10.4.89.179
219	10.4.89.180/31	10.4.89.180 – 10.4.89.181	10.4.89.181
220	10.4.89.182/31	10.4.89.182 – 10.4.89.183	10.4.89.183
221	10.4.89.184/31	10.4.89.184 – 10.4.89.185	10.4.89.185
222	10.4.89.186/31	10.4.89.186 – 10.4.89.187	10.4.89.187
223	10.4.89.188/31	10.4.89.188 – 10.4.89.189	10.4.89.189
224	10.4.89.190/31	10.4.89.190 – 10.4.89.191	10.4.89.191
225	10.4.89.192/31	10.4.89.192 – 10.4.89.193	10.4.89.193
226	10.4.89.194/31	10.4.89.194 – 10.4.89.195	10.4.89.195
227	10.4.89.196/31	10.4.89.196 – 10.4.89.197	10.4.89.197
228	10.4.89.198/31	10.4.89.198 – 10.4.89.199	10.4.89.199
229	10.4.89.200/31	10.4.89.200 – 10.4.89.201	10.4.89.201
230	10.4.89.202/31	10.4.89.202 – 10.4.89.203	10.4.89.203
231	10.4.89.204/31	10.4.89.204 – 10.4.89.205	10.4.89.205
232	10.4.89.206/31	10.4.89.206 – 10.4.89.207	10.4.89.207
233	10.4.89.208/31	10.4.89.208 – 10.4.89.209	10.4.89.209
234	10.4.89.210/31	10.4.89.210 – 10.4.89.211	10.4.89.211
235	10.4.89.212/31	10.4.89.212 – 10.4.89.213	10.4.89.213
236	10.4.89.214/31	10.4.89.214 – 10.4.89.215	10.4.89.215
237	10.4.89.216/31	10.4.89.216 – 10.4.89.217	10.4.89.217
238	10.4.89.218/31	10.4.89.218 – 10.4.89.219	10.4.89.219
239	10.4.89.220/31	10.4.89.220 – 10.4.89.221	10.4.89.221
240	10.4.89.222/31	10.4.89.222 – 10.4.89.223	10.4.89.223
241	10.4.89.224/31	10.4.89.224 – 10.4.89.225	10.4.89.225
242	10.4.89.226/31	10.4.89.226 – 10.4.89.227	10.4.89.227
243	10.4.89.228/31	10.4.89.228 – 10.4.89.229	10.4.89.229
244	10.4.89.230/31	10.4.89.230 – 10.4.89.231	10.4.89.231
245	10.4.89.232/31	10.4.89.232 – 10.4.89.233	10.4.89.233
246	10.4.89.234/31	10.4.89.234 – 10.4.89.235	10.4.89.235
247	10.4.89.236/31	10.4.89.236 – 10.4.89.237	10.4.89.237
248	10.4.89.238/31	10.4.89.238 – 10.4.89.239	10.4.89.239
249	10.4.89.240/31	10.4.89.240 – 10.4.89.241	10.4.89.241
250	10.4.89.242/31	10.4.89.242 – 10.4.89.243	10.4.89.243
251	10.4.89.244/31	10.4.89.244 – 10.4.89.245	10.4.89.245
252	10.4.89.246/31	10.4.89.246 – 10.4.89.247	10.4.89.247
253	10.4.89.248/31	10.4.89.248 – 10.4.89.249	10.4.89.249
254	10.4.89.250/31	10.4.89.250 – 10.4.89.251	10.4.89.251
255	10.4.89.252/31	10.4.89.252 – 10.4.89.253	10.4.89.253
256	10.4.89.254/31	10.4.89.254 – 10.4.89.255	10.4.89.255

showing 256 of 1,024

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 →