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)10.4.160.0/21

network10.4.160.0/21

broadcast10.4.167.255

first host10.4.160.1

last host10.4.167.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.160.0/21

address00001010.00000100.10100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.10100000.00000000

broadcast00001010.00000100.10100111.11111111

green = network part, grey = host part

hex0x0a04a000

decimal168075264

reverse dns0.160.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:a000

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.4.160.0/31	10.4.160.0 – 10.4.160.1	10.4.160.1
2	10.4.160.2/31	10.4.160.2 – 10.4.160.3	10.4.160.3
3	10.4.160.4/31	10.4.160.4 – 10.4.160.5	10.4.160.5
4	10.4.160.6/31	10.4.160.6 – 10.4.160.7	10.4.160.7
5	10.4.160.8/31	10.4.160.8 – 10.4.160.9	10.4.160.9
6	10.4.160.10/31	10.4.160.10 – 10.4.160.11	10.4.160.11
7	10.4.160.12/31	10.4.160.12 – 10.4.160.13	10.4.160.13
8	10.4.160.14/31	10.4.160.14 – 10.4.160.15	10.4.160.15
9	10.4.160.16/31	10.4.160.16 – 10.4.160.17	10.4.160.17
10	10.4.160.18/31	10.4.160.18 – 10.4.160.19	10.4.160.19
11	10.4.160.20/31	10.4.160.20 – 10.4.160.21	10.4.160.21
12	10.4.160.22/31	10.4.160.22 – 10.4.160.23	10.4.160.23
13	10.4.160.24/31	10.4.160.24 – 10.4.160.25	10.4.160.25
14	10.4.160.26/31	10.4.160.26 – 10.4.160.27	10.4.160.27
15	10.4.160.28/31	10.4.160.28 – 10.4.160.29	10.4.160.29
16	10.4.160.30/31	10.4.160.30 – 10.4.160.31	10.4.160.31
17	10.4.160.32/31	10.4.160.32 – 10.4.160.33	10.4.160.33
18	10.4.160.34/31	10.4.160.34 – 10.4.160.35	10.4.160.35
19	10.4.160.36/31	10.4.160.36 – 10.4.160.37	10.4.160.37
20	10.4.160.38/31	10.4.160.38 – 10.4.160.39	10.4.160.39
21	10.4.160.40/31	10.4.160.40 – 10.4.160.41	10.4.160.41
22	10.4.160.42/31	10.4.160.42 – 10.4.160.43	10.4.160.43
23	10.4.160.44/31	10.4.160.44 – 10.4.160.45	10.4.160.45
24	10.4.160.46/31	10.4.160.46 – 10.4.160.47	10.4.160.47
25	10.4.160.48/31	10.4.160.48 – 10.4.160.49	10.4.160.49
26	10.4.160.50/31	10.4.160.50 – 10.4.160.51	10.4.160.51
27	10.4.160.52/31	10.4.160.52 – 10.4.160.53	10.4.160.53
28	10.4.160.54/31	10.4.160.54 – 10.4.160.55	10.4.160.55
29	10.4.160.56/31	10.4.160.56 – 10.4.160.57	10.4.160.57
30	10.4.160.58/31	10.4.160.58 – 10.4.160.59	10.4.160.59
31	10.4.160.60/31	10.4.160.60 – 10.4.160.61	10.4.160.61
32	10.4.160.62/31	10.4.160.62 – 10.4.160.63	10.4.160.63
33	10.4.160.64/31	10.4.160.64 – 10.4.160.65	10.4.160.65
34	10.4.160.66/31	10.4.160.66 – 10.4.160.67	10.4.160.67
35	10.4.160.68/31	10.4.160.68 – 10.4.160.69	10.4.160.69
36	10.4.160.70/31	10.4.160.70 – 10.4.160.71	10.4.160.71
37	10.4.160.72/31	10.4.160.72 – 10.4.160.73	10.4.160.73
38	10.4.160.74/31	10.4.160.74 – 10.4.160.75	10.4.160.75
39	10.4.160.76/31	10.4.160.76 – 10.4.160.77	10.4.160.77
40	10.4.160.78/31	10.4.160.78 – 10.4.160.79	10.4.160.79
41	10.4.160.80/31	10.4.160.80 – 10.4.160.81	10.4.160.81
42	10.4.160.82/31	10.4.160.82 – 10.4.160.83	10.4.160.83
43	10.4.160.84/31	10.4.160.84 – 10.4.160.85	10.4.160.85
44	10.4.160.86/31	10.4.160.86 – 10.4.160.87	10.4.160.87
45	10.4.160.88/31	10.4.160.88 – 10.4.160.89	10.4.160.89
46	10.4.160.90/31	10.4.160.90 – 10.4.160.91	10.4.160.91
47	10.4.160.92/31	10.4.160.92 – 10.4.160.93	10.4.160.93
48	10.4.160.94/31	10.4.160.94 – 10.4.160.95	10.4.160.95
49	10.4.160.96/31	10.4.160.96 – 10.4.160.97	10.4.160.97
50	10.4.160.98/31	10.4.160.98 – 10.4.160.99	10.4.160.99
51	10.4.160.100/31	10.4.160.100 – 10.4.160.101	10.4.160.101
52	10.4.160.102/31	10.4.160.102 – 10.4.160.103	10.4.160.103
53	10.4.160.104/31	10.4.160.104 – 10.4.160.105	10.4.160.105
54	10.4.160.106/31	10.4.160.106 – 10.4.160.107	10.4.160.107
55	10.4.160.108/31	10.4.160.108 – 10.4.160.109	10.4.160.109
56	10.4.160.110/31	10.4.160.110 – 10.4.160.111	10.4.160.111
57	10.4.160.112/31	10.4.160.112 – 10.4.160.113	10.4.160.113
58	10.4.160.114/31	10.4.160.114 – 10.4.160.115	10.4.160.115
59	10.4.160.116/31	10.4.160.116 – 10.4.160.117	10.4.160.117
60	10.4.160.118/31	10.4.160.118 – 10.4.160.119	10.4.160.119
61	10.4.160.120/31	10.4.160.120 – 10.4.160.121	10.4.160.121
62	10.4.160.122/31	10.4.160.122 – 10.4.160.123	10.4.160.123
63	10.4.160.124/31	10.4.160.124 – 10.4.160.125	10.4.160.125
64	10.4.160.126/31	10.4.160.126 – 10.4.160.127	10.4.160.127
65	10.4.160.128/31	10.4.160.128 – 10.4.160.129	10.4.160.129
66	10.4.160.130/31	10.4.160.130 – 10.4.160.131	10.4.160.131
67	10.4.160.132/31	10.4.160.132 – 10.4.160.133	10.4.160.133
68	10.4.160.134/31	10.4.160.134 – 10.4.160.135	10.4.160.135
69	10.4.160.136/31	10.4.160.136 – 10.4.160.137	10.4.160.137
70	10.4.160.138/31	10.4.160.138 – 10.4.160.139	10.4.160.139
71	10.4.160.140/31	10.4.160.140 – 10.4.160.141	10.4.160.141
72	10.4.160.142/31	10.4.160.142 – 10.4.160.143	10.4.160.143
73	10.4.160.144/31	10.4.160.144 – 10.4.160.145	10.4.160.145
74	10.4.160.146/31	10.4.160.146 – 10.4.160.147	10.4.160.147
75	10.4.160.148/31	10.4.160.148 – 10.4.160.149	10.4.160.149
76	10.4.160.150/31	10.4.160.150 – 10.4.160.151	10.4.160.151
77	10.4.160.152/31	10.4.160.152 – 10.4.160.153	10.4.160.153
78	10.4.160.154/31	10.4.160.154 – 10.4.160.155	10.4.160.155
79	10.4.160.156/31	10.4.160.156 – 10.4.160.157	10.4.160.157
80	10.4.160.158/31	10.4.160.158 – 10.4.160.159	10.4.160.159
81	10.4.160.160/31	10.4.160.160 – 10.4.160.161	10.4.160.161
82	10.4.160.162/31	10.4.160.162 – 10.4.160.163	10.4.160.163
83	10.4.160.164/31	10.4.160.164 – 10.4.160.165	10.4.160.165
84	10.4.160.166/31	10.4.160.166 – 10.4.160.167	10.4.160.167
85	10.4.160.168/31	10.4.160.168 – 10.4.160.169	10.4.160.169
86	10.4.160.170/31	10.4.160.170 – 10.4.160.171	10.4.160.171
87	10.4.160.172/31	10.4.160.172 – 10.4.160.173	10.4.160.173
88	10.4.160.174/31	10.4.160.174 – 10.4.160.175	10.4.160.175
89	10.4.160.176/31	10.4.160.176 – 10.4.160.177	10.4.160.177
90	10.4.160.178/31	10.4.160.178 – 10.4.160.179	10.4.160.179
91	10.4.160.180/31	10.4.160.180 – 10.4.160.181	10.4.160.181
92	10.4.160.182/31	10.4.160.182 – 10.4.160.183	10.4.160.183
93	10.4.160.184/31	10.4.160.184 – 10.4.160.185	10.4.160.185
94	10.4.160.186/31	10.4.160.186 – 10.4.160.187	10.4.160.187
95	10.4.160.188/31	10.4.160.188 – 10.4.160.189	10.4.160.189
96	10.4.160.190/31	10.4.160.190 – 10.4.160.191	10.4.160.191
97	10.4.160.192/31	10.4.160.192 – 10.4.160.193	10.4.160.193
98	10.4.160.194/31	10.4.160.194 – 10.4.160.195	10.4.160.195
99	10.4.160.196/31	10.4.160.196 – 10.4.160.197	10.4.160.197
100	10.4.160.198/31	10.4.160.198 – 10.4.160.199	10.4.160.199
101	10.4.160.200/31	10.4.160.200 – 10.4.160.201	10.4.160.201
102	10.4.160.202/31	10.4.160.202 – 10.4.160.203	10.4.160.203
103	10.4.160.204/31	10.4.160.204 – 10.4.160.205	10.4.160.205
104	10.4.160.206/31	10.4.160.206 – 10.4.160.207	10.4.160.207
105	10.4.160.208/31	10.4.160.208 – 10.4.160.209	10.4.160.209
106	10.4.160.210/31	10.4.160.210 – 10.4.160.211	10.4.160.211
107	10.4.160.212/31	10.4.160.212 – 10.4.160.213	10.4.160.213
108	10.4.160.214/31	10.4.160.214 – 10.4.160.215	10.4.160.215
109	10.4.160.216/31	10.4.160.216 – 10.4.160.217	10.4.160.217
110	10.4.160.218/31	10.4.160.218 – 10.4.160.219	10.4.160.219
111	10.4.160.220/31	10.4.160.220 – 10.4.160.221	10.4.160.221
112	10.4.160.222/31	10.4.160.222 – 10.4.160.223	10.4.160.223
113	10.4.160.224/31	10.4.160.224 – 10.4.160.225	10.4.160.225
114	10.4.160.226/31	10.4.160.226 – 10.4.160.227	10.4.160.227
115	10.4.160.228/31	10.4.160.228 – 10.4.160.229	10.4.160.229
116	10.4.160.230/31	10.4.160.230 – 10.4.160.231	10.4.160.231
117	10.4.160.232/31	10.4.160.232 – 10.4.160.233	10.4.160.233
118	10.4.160.234/31	10.4.160.234 – 10.4.160.235	10.4.160.235
119	10.4.160.236/31	10.4.160.236 – 10.4.160.237	10.4.160.237
120	10.4.160.238/31	10.4.160.238 – 10.4.160.239	10.4.160.239
121	10.4.160.240/31	10.4.160.240 – 10.4.160.241	10.4.160.241
122	10.4.160.242/31	10.4.160.242 – 10.4.160.243	10.4.160.243
123	10.4.160.244/31	10.4.160.244 – 10.4.160.245	10.4.160.245
124	10.4.160.246/31	10.4.160.246 – 10.4.160.247	10.4.160.247
125	10.4.160.248/31	10.4.160.248 – 10.4.160.249	10.4.160.249
126	10.4.160.250/31	10.4.160.250 – 10.4.160.251	10.4.160.251
127	10.4.160.252/31	10.4.160.252 – 10.4.160.253	10.4.160.253
128	10.4.160.254/31	10.4.160.254 – 10.4.160.255	10.4.160.255
129	10.4.161.0/31	10.4.161.0 – 10.4.161.1	10.4.161.1
130	10.4.161.2/31	10.4.161.2 – 10.4.161.3	10.4.161.3
131	10.4.161.4/31	10.4.161.4 – 10.4.161.5	10.4.161.5
132	10.4.161.6/31	10.4.161.6 – 10.4.161.7	10.4.161.7
133	10.4.161.8/31	10.4.161.8 – 10.4.161.9	10.4.161.9
134	10.4.161.10/31	10.4.161.10 – 10.4.161.11	10.4.161.11
135	10.4.161.12/31	10.4.161.12 – 10.4.161.13	10.4.161.13
136	10.4.161.14/31	10.4.161.14 – 10.4.161.15	10.4.161.15
137	10.4.161.16/31	10.4.161.16 – 10.4.161.17	10.4.161.17
138	10.4.161.18/31	10.4.161.18 – 10.4.161.19	10.4.161.19
139	10.4.161.20/31	10.4.161.20 – 10.4.161.21	10.4.161.21
140	10.4.161.22/31	10.4.161.22 – 10.4.161.23	10.4.161.23
141	10.4.161.24/31	10.4.161.24 – 10.4.161.25	10.4.161.25
142	10.4.161.26/31	10.4.161.26 – 10.4.161.27	10.4.161.27
143	10.4.161.28/31	10.4.161.28 – 10.4.161.29	10.4.161.29
144	10.4.161.30/31	10.4.161.30 – 10.4.161.31	10.4.161.31
145	10.4.161.32/31	10.4.161.32 – 10.4.161.33	10.4.161.33
146	10.4.161.34/31	10.4.161.34 – 10.4.161.35	10.4.161.35
147	10.4.161.36/31	10.4.161.36 – 10.4.161.37	10.4.161.37
148	10.4.161.38/31	10.4.161.38 – 10.4.161.39	10.4.161.39
149	10.4.161.40/31	10.4.161.40 – 10.4.161.41	10.4.161.41
150	10.4.161.42/31	10.4.161.42 – 10.4.161.43	10.4.161.43
151	10.4.161.44/31	10.4.161.44 – 10.4.161.45	10.4.161.45
152	10.4.161.46/31	10.4.161.46 – 10.4.161.47	10.4.161.47
153	10.4.161.48/31	10.4.161.48 – 10.4.161.49	10.4.161.49
154	10.4.161.50/31	10.4.161.50 – 10.4.161.51	10.4.161.51
155	10.4.161.52/31	10.4.161.52 – 10.4.161.53	10.4.161.53
156	10.4.161.54/31	10.4.161.54 – 10.4.161.55	10.4.161.55
157	10.4.161.56/31	10.4.161.56 – 10.4.161.57	10.4.161.57
158	10.4.161.58/31	10.4.161.58 – 10.4.161.59	10.4.161.59
159	10.4.161.60/31	10.4.161.60 – 10.4.161.61	10.4.161.61
160	10.4.161.62/31	10.4.161.62 – 10.4.161.63	10.4.161.63
161	10.4.161.64/31	10.4.161.64 – 10.4.161.65	10.4.161.65
162	10.4.161.66/31	10.4.161.66 – 10.4.161.67	10.4.161.67
163	10.4.161.68/31	10.4.161.68 – 10.4.161.69	10.4.161.69
164	10.4.161.70/31	10.4.161.70 – 10.4.161.71	10.4.161.71
165	10.4.161.72/31	10.4.161.72 – 10.4.161.73	10.4.161.73
166	10.4.161.74/31	10.4.161.74 – 10.4.161.75	10.4.161.75
167	10.4.161.76/31	10.4.161.76 – 10.4.161.77	10.4.161.77
168	10.4.161.78/31	10.4.161.78 – 10.4.161.79	10.4.161.79
169	10.4.161.80/31	10.4.161.80 – 10.4.161.81	10.4.161.81
170	10.4.161.82/31	10.4.161.82 – 10.4.161.83	10.4.161.83
171	10.4.161.84/31	10.4.161.84 – 10.4.161.85	10.4.161.85
172	10.4.161.86/31	10.4.161.86 – 10.4.161.87	10.4.161.87
173	10.4.161.88/31	10.4.161.88 – 10.4.161.89	10.4.161.89
174	10.4.161.90/31	10.4.161.90 – 10.4.161.91	10.4.161.91
175	10.4.161.92/31	10.4.161.92 – 10.4.161.93	10.4.161.93
176	10.4.161.94/31	10.4.161.94 – 10.4.161.95	10.4.161.95
177	10.4.161.96/31	10.4.161.96 – 10.4.161.97	10.4.161.97
178	10.4.161.98/31	10.4.161.98 – 10.4.161.99	10.4.161.99
179	10.4.161.100/31	10.4.161.100 – 10.4.161.101	10.4.161.101
180	10.4.161.102/31	10.4.161.102 – 10.4.161.103	10.4.161.103
181	10.4.161.104/31	10.4.161.104 – 10.4.161.105	10.4.161.105
182	10.4.161.106/31	10.4.161.106 – 10.4.161.107	10.4.161.107
183	10.4.161.108/31	10.4.161.108 – 10.4.161.109	10.4.161.109
184	10.4.161.110/31	10.4.161.110 – 10.4.161.111	10.4.161.111
185	10.4.161.112/31	10.4.161.112 – 10.4.161.113	10.4.161.113
186	10.4.161.114/31	10.4.161.114 – 10.4.161.115	10.4.161.115
187	10.4.161.116/31	10.4.161.116 – 10.4.161.117	10.4.161.117
188	10.4.161.118/31	10.4.161.118 – 10.4.161.119	10.4.161.119
189	10.4.161.120/31	10.4.161.120 – 10.4.161.121	10.4.161.121
190	10.4.161.122/31	10.4.161.122 – 10.4.161.123	10.4.161.123
191	10.4.161.124/31	10.4.161.124 – 10.4.161.125	10.4.161.125
192	10.4.161.126/31	10.4.161.126 – 10.4.161.127	10.4.161.127
193	10.4.161.128/31	10.4.161.128 – 10.4.161.129	10.4.161.129
194	10.4.161.130/31	10.4.161.130 – 10.4.161.131	10.4.161.131
195	10.4.161.132/31	10.4.161.132 – 10.4.161.133	10.4.161.133
196	10.4.161.134/31	10.4.161.134 – 10.4.161.135	10.4.161.135
197	10.4.161.136/31	10.4.161.136 – 10.4.161.137	10.4.161.137
198	10.4.161.138/31	10.4.161.138 – 10.4.161.139	10.4.161.139
199	10.4.161.140/31	10.4.161.140 – 10.4.161.141	10.4.161.141
200	10.4.161.142/31	10.4.161.142 – 10.4.161.143	10.4.161.143
201	10.4.161.144/31	10.4.161.144 – 10.4.161.145	10.4.161.145
202	10.4.161.146/31	10.4.161.146 – 10.4.161.147	10.4.161.147
203	10.4.161.148/31	10.4.161.148 – 10.4.161.149	10.4.161.149
204	10.4.161.150/31	10.4.161.150 – 10.4.161.151	10.4.161.151
205	10.4.161.152/31	10.4.161.152 – 10.4.161.153	10.4.161.153
206	10.4.161.154/31	10.4.161.154 – 10.4.161.155	10.4.161.155
207	10.4.161.156/31	10.4.161.156 – 10.4.161.157	10.4.161.157
208	10.4.161.158/31	10.4.161.158 – 10.4.161.159	10.4.161.159
209	10.4.161.160/31	10.4.161.160 – 10.4.161.161	10.4.161.161
210	10.4.161.162/31	10.4.161.162 – 10.4.161.163	10.4.161.163
211	10.4.161.164/31	10.4.161.164 – 10.4.161.165	10.4.161.165
212	10.4.161.166/31	10.4.161.166 – 10.4.161.167	10.4.161.167
213	10.4.161.168/31	10.4.161.168 – 10.4.161.169	10.4.161.169
214	10.4.161.170/31	10.4.161.170 – 10.4.161.171	10.4.161.171
215	10.4.161.172/31	10.4.161.172 – 10.4.161.173	10.4.161.173
216	10.4.161.174/31	10.4.161.174 – 10.4.161.175	10.4.161.175
217	10.4.161.176/31	10.4.161.176 – 10.4.161.177	10.4.161.177
218	10.4.161.178/31	10.4.161.178 – 10.4.161.179	10.4.161.179
219	10.4.161.180/31	10.4.161.180 – 10.4.161.181	10.4.161.181
220	10.4.161.182/31	10.4.161.182 – 10.4.161.183	10.4.161.183
221	10.4.161.184/31	10.4.161.184 – 10.4.161.185	10.4.161.185
222	10.4.161.186/31	10.4.161.186 – 10.4.161.187	10.4.161.187
223	10.4.161.188/31	10.4.161.188 – 10.4.161.189	10.4.161.189
224	10.4.161.190/31	10.4.161.190 – 10.4.161.191	10.4.161.191
225	10.4.161.192/31	10.4.161.192 – 10.4.161.193	10.4.161.193
226	10.4.161.194/31	10.4.161.194 – 10.4.161.195	10.4.161.195
227	10.4.161.196/31	10.4.161.196 – 10.4.161.197	10.4.161.197
228	10.4.161.198/31	10.4.161.198 – 10.4.161.199	10.4.161.199
229	10.4.161.200/31	10.4.161.200 – 10.4.161.201	10.4.161.201
230	10.4.161.202/31	10.4.161.202 – 10.4.161.203	10.4.161.203
231	10.4.161.204/31	10.4.161.204 – 10.4.161.205	10.4.161.205
232	10.4.161.206/31	10.4.161.206 – 10.4.161.207	10.4.161.207
233	10.4.161.208/31	10.4.161.208 – 10.4.161.209	10.4.161.209
234	10.4.161.210/31	10.4.161.210 – 10.4.161.211	10.4.161.211
235	10.4.161.212/31	10.4.161.212 – 10.4.161.213	10.4.161.213
236	10.4.161.214/31	10.4.161.214 – 10.4.161.215	10.4.161.215
237	10.4.161.216/31	10.4.161.216 – 10.4.161.217	10.4.161.217
238	10.4.161.218/31	10.4.161.218 – 10.4.161.219	10.4.161.219
239	10.4.161.220/31	10.4.161.220 – 10.4.161.221	10.4.161.221
240	10.4.161.222/31	10.4.161.222 – 10.4.161.223	10.4.161.223
241	10.4.161.224/31	10.4.161.224 – 10.4.161.225	10.4.161.225
242	10.4.161.226/31	10.4.161.226 – 10.4.161.227	10.4.161.227
243	10.4.161.228/31	10.4.161.228 – 10.4.161.229	10.4.161.229
244	10.4.161.230/31	10.4.161.230 – 10.4.161.231	10.4.161.231
245	10.4.161.232/31	10.4.161.232 – 10.4.161.233	10.4.161.233
246	10.4.161.234/31	10.4.161.234 – 10.4.161.235	10.4.161.235
247	10.4.161.236/31	10.4.161.236 – 10.4.161.237	10.4.161.237
248	10.4.161.238/31	10.4.161.238 – 10.4.161.239	10.4.161.239
249	10.4.161.240/31	10.4.161.240 – 10.4.161.241	10.4.161.241
250	10.4.161.242/31	10.4.161.242 – 10.4.161.243	10.4.161.243
251	10.4.161.244/31	10.4.161.244 – 10.4.161.245	10.4.161.245
252	10.4.161.246/31	10.4.161.246 – 10.4.161.247	10.4.161.247
253	10.4.161.248/31	10.4.161.248 – 10.4.161.249	10.4.161.249
254	10.4.161.250/31	10.4.161.250 – 10.4.161.251	10.4.161.251
255	10.4.161.252/31	10.4.161.252 – 10.4.161.253	10.4.161.253
256	10.4.161.254/31	10.4.161.254 – 10.4.161.255	10.4.161.255

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 →