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)172.16.6.0/23

network172.16.6.0/23

broadcast172.16.7.255

first host172.16.6.1

last host172.16.7.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classB

ipcalc 172.16.6.0/23

address10101100.00010000.00000110.00000000

subnet mask11111111.11111111.11111110.00000000

network10101100.00010000.00000110.00000000

broadcast10101100.00010000.00000111.11111111

green = network part, grey = host part

hex0xac100600

decimal2886731264

reverse dns0.6.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:600

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	172.16.6.0/31	172.16.6.0 – 172.16.6.1	172.16.6.1
2	172.16.6.2/31	172.16.6.2 – 172.16.6.3	172.16.6.3
3	172.16.6.4/31	172.16.6.4 – 172.16.6.5	172.16.6.5
4	172.16.6.6/31	172.16.6.6 – 172.16.6.7	172.16.6.7
5	172.16.6.8/31	172.16.6.8 – 172.16.6.9	172.16.6.9
6	172.16.6.10/31	172.16.6.10 – 172.16.6.11	172.16.6.11
7	172.16.6.12/31	172.16.6.12 – 172.16.6.13	172.16.6.13
8	172.16.6.14/31	172.16.6.14 – 172.16.6.15	172.16.6.15
9	172.16.6.16/31	172.16.6.16 – 172.16.6.17	172.16.6.17
10	172.16.6.18/31	172.16.6.18 – 172.16.6.19	172.16.6.19
11	172.16.6.20/31	172.16.6.20 – 172.16.6.21	172.16.6.21
12	172.16.6.22/31	172.16.6.22 – 172.16.6.23	172.16.6.23
13	172.16.6.24/31	172.16.6.24 – 172.16.6.25	172.16.6.25
14	172.16.6.26/31	172.16.6.26 – 172.16.6.27	172.16.6.27
15	172.16.6.28/31	172.16.6.28 – 172.16.6.29	172.16.6.29
16	172.16.6.30/31	172.16.6.30 – 172.16.6.31	172.16.6.31
17	172.16.6.32/31	172.16.6.32 – 172.16.6.33	172.16.6.33
18	172.16.6.34/31	172.16.6.34 – 172.16.6.35	172.16.6.35
19	172.16.6.36/31	172.16.6.36 – 172.16.6.37	172.16.6.37
20	172.16.6.38/31	172.16.6.38 – 172.16.6.39	172.16.6.39
21	172.16.6.40/31	172.16.6.40 – 172.16.6.41	172.16.6.41
22	172.16.6.42/31	172.16.6.42 – 172.16.6.43	172.16.6.43
23	172.16.6.44/31	172.16.6.44 – 172.16.6.45	172.16.6.45
24	172.16.6.46/31	172.16.6.46 – 172.16.6.47	172.16.6.47
25	172.16.6.48/31	172.16.6.48 – 172.16.6.49	172.16.6.49
26	172.16.6.50/31	172.16.6.50 – 172.16.6.51	172.16.6.51
27	172.16.6.52/31	172.16.6.52 – 172.16.6.53	172.16.6.53
28	172.16.6.54/31	172.16.6.54 – 172.16.6.55	172.16.6.55
29	172.16.6.56/31	172.16.6.56 – 172.16.6.57	172.16.6.57
30	172.16.6.58/31	172.16.6.58 – 172.16.6.59	172.16.6.59
31	172.16.6.60/31	172.16.6.60 – 172.16.6.61	172.16.6.61
32	172.16.6.62/31	172.16.6.62 – 172.16.6.63	172.16.6.63
33	172.16.6.64/31	172.16.6.64 – 172.16.6.65	172.16.6.65
34	172.16.6.66/31	172.16.6.66 – 172.16.6.67	172.16.6.67
35	172.16.6.68/31	172.16.6.68 – 172.16.6.69	172.16.6.69
36	172.16.6.70/31	172.16.6.70 – 172.16.6.71	172.16.6.71
37	172.16.6.72/31	172.16.6.72 – 172.16.6.73	172.16.6.73
38	172.16.6.74/31	172.16.6.74 – 172.16.6.75	172.16.6.75
39	172.16.6.76/31	172.16.6.76 – 172.16.6.77	172.16.6.77
40	172.16.6.78/31	172.16.6.78 – 172.16.6.79	172.16.6.79
41	172.16.6.80/31	172.16.6.80 – 172.16.6.81	172.16.6.81
42	172.16.6.82/31	172.16.6.82 – 172.16.6.83	172.16.6.83
43	172.16.6.84/31	172.16.6.84 – 172.16.6.85	172.16.6.85
44	172.16.6.86/31	172.16.6.86 – 172.16.6.87	172.16.6.87
45	172.16.6.88/31	172.16.6.88 – 172.16.6.89	172.16.6.89
46	172.16.6.90/31	172.16.6.90 – 172.16.6.91	172.16.6.91
47	172.16.6.92/31	172.16.6.92 – 172.16.6.93	172.16.6.93
48	172.16.6.94/31	172.16.6.94 – 172.16.6.95	172.16.6.95
49	172.16.6.96/31	172.16.6.96 – 172.16.6.97	172.16.6.97
50	172.16.6.98/31	172.16.6.98 – 172.16.6.99	172.16.6.99
51	172.16.6.100/31	172.16.6.100 – 172.16.6.101	172.16.6.101
52	172.16.6.102/31	172.16.6.102 – 172.16.6.103	172.16.6.103
53	172.16.6.104/31	172.16.6.104 – 172.16.6.105	172.16.6.105
54	172.16.6.106/31	172.16.6.106 – 172.16.6.107	172.16.6.107
55	172.16.6.108/31	172.16.6.108 – 172.16.6.109	172.16.6.109
56	172.16.6.110/31	172.16.6.110 – 172.16.6.111	172.16.6.111
57	172.16.6.112/31	172.16.6.112 – 172.16.6.113	172.16.6.113
58	172.16.6.114/31	172.16.6.114 – 172.16.6.115	172.16.6.115
59	172.16.6.116/31	172.16.6.116 – 172.16.6.117	172.16.6.117
60	172.16.6.118/31	172.16.6.118 – 172.16.6.119	172.16.6.119
61	172.16.6.120/31	172.16.6.120 – 172.16.6.121	172.16.6.121
62	172.16.6.122/31	172.16.6.122 – 172.16.6.123	172.16.6.123
63	172.16.6.124/31	172.16.6.124 – 172.16.6.125	172.16.6.125
64	172.16.6.126/31	172.16.6.126 – 172.16.6.127	172.16.6.127
65	172.16.6.128/31	172.16.6.128 – 172.16.6.129	172.16.6.129
66	172.16.6.130/31	172.16.6.130 – 172.16.6.131	172.16.6.131
67	172.16.6.132/31	172.16.6.132 – 172.16.6.133	172.16.6.133
68	172.16.6.134/31	172.16.6.134 – 172.16.6.135	172.16.6.135
69	172.16.6.136/31	172.16.6.136 – 172.16.6.137	172.16.6.137
70	172.16.6.138/31	172.16.6.138 – 172.16.6.139	172.16.6.139
71	172.16.6.140/31	172.16.6.140 – 172.16.6.141	172.16.6.141
72	172.16.6.142/31	172.16.6.142 – 172.16.6.143	172.16.6.143
73	172.16.6.144/31	172.16.6.144 – 172.16.6.145	172.16.6.145
74	172.16.6.146/31	172.16.6.146 – 172.16.6.147	172.16.6.147
75	172.16.6.148/31	172.16.6.148 – 172.16.6.149	172.16.6.149
76	172.16.6.150/31	172.16.6.150 – 172.16.6.151	172.16.6.151
77	172.16.6.152/31	172.16.6.152 – 172.16.6.153	172.16.6.153
78	172.16.6.154/31	172.16.6.154 – 172.16.6.155	172.16.6.155
79	172.16.6.156/31	172.16.6.156 – 172.16.6.157	172.16.6.157
80	172.16.6.158/31	172.16.6.158 – 172.16.6.159	172.16.6.159
81	172.16.6.160/31	172.16.6.160 – 172.16.6.161	172.16.6.161
82	172.16.6.162/31	172.16.6.162 – 172.16.6.163	172.16.6.163
83	172.16.6.164/31	172.16.6.164 – 172.16.6.165	172.16.6.165
84	172.16.6.166/31	172.16.6.166 – 172.16.6.167	172.16.6.167
85	172.16.6.168/31	172.16.6.168 – 172.16.6.169	172.16.6.169
86	172.16.6.170/31	172.16.6.170 – 172.16.6.171	172.16.6.171
87	172.16.6.172/31	172.16.6.172 – 172.16.6.173	172.16.6.173
88	172.16.6.174/31	172.16.6.174 – 172.16.6.175	172.16.6.175
89	172.16.6.176/31	172.16.6.176 – 172.16.6.177	172.16.6.177
90	172.16.6.178/31	172.16.6.178 – 172.16.6.179	172.16.6.179
91	172.16.6.180/31	172.16.6.180 – 172.16.6.181	172.16.6.181
92	172.16.6.182/31	172.16.6.182 – 172.16.6.183	172.16.6.183
93	172.16.6.184/31	172.16.6.184 – 172.16.6.185	172.16.6.185
94	172.16.6.186/31	172.16.6.186 – 172.16.6.187	172.16.6.187
95	172.16.6.188/31	172.16.6.188 – 172.16.6.189	172.16.6.189
96	172.16.6.190/31	172.16.6.190 – 172.16.6.191	172.16.6.191
97	172.16.6.192/31	172.16.6.192 – 172.16.6.193	172.16.6.193
98	172.16.6.194/31	172.16.6.194 – 172.16.6.195	172.16.6.195
99	172.16.6.196/31	172.16.6.196 – 172.16.6.197	172.16.6.197
100	172.16.6.198/31	172.16.6.198 – 172.16.6.199	172.16.6.199
101	172.16.6.200/31	172.16.6.200 – 172.16.6.201	172.16.6.201
102	172.16.6.202/31	172.16.6.202 – 172.16.6.203	172.16.6.203
103	172.16.6.204/31	172.16.6.204 – 172.16.6.205	172.16.6.205
104	172.16.6.206/31	172.16.6.206 – 172.16.6.207	172.16.6.207
105	172.16.6.208/31	172.16.6.208 – 172.16.6.209	172.16.6.209
106	172.16.6.210/31	172.16.6.210 – 172.16.6.211	172.16.6.211
107	172.16.6.212/31	172.16.6.212 – 172.16.6.213	172.16.6.213
108	172.16.6.214/31	172.16.6.214 – 172.16.6.215	172.16.6.215
109	172.16.6.216/31	172.16.6.216 – 172.16.6.217	172.16.6.217
110	172.16.6.218/31	172.16.6.218 – 172.16.6.219	172.16.6.219
111	172.16.6.220/31	172.16.6.220 – 172.16.6.221	172.16.6.221
112	172.16.6.222/31	172.16.6.222 – 172.16.6.223	172.16.6.223
113	172.16.6.224/31	172.16.6.224 – 172.16.6.225	172.16.6.225
114	172.16.6.226/31	172.16.6.226 – 172.16.6.227	172.16.6.227
115	172.16.6.228/31	172.16.6.228 – 172.16.6.229	172.16.6.229
116	172.16.6.230/31	172.16.6.230 – 172.16.6.231	172.16.6.231
117	172.16.6.232/31	172.16.6.232 – 172.16.6.233	172.16.6.233
118	172.16.6.234/31	172.16.6.234 – 172.16.6.235	172.16.6.235
119	172.16.6.236/31	172.16.6.236 – 172.16.6.237	172.16.6.237
120	172.16.6.238/31	172.16.6.238 – 172.16.6.239	172.16.6.239
121	172.16.6.240/31	172.16.6.240 – 172.16.6.241	172.16.6.241
122	172.16.6.242/31	172.16.6.242 – 172.16.6.243	172.16.6.243
123	172.16.6.244/31	172.16.6.244 – 172.16.6.245	172.16.6.245
124	172.16.6.246/31	172.16.6.246 – 172.16.6.247	172.16.6.247
125	172.16.6.248/31	172.16.6.248 – 172.16.6.249	172.16.6.249
126	172.16.6.250/31	172.16.6.250 – 172.16.6.251	172.16.6.251
127	172.16.6.252/31	172.16.6.252 – 172.16.6.253	172.16.6.253
128	172.16.6.254/31	172.16.6.254 – 172.16.6.255	172.16.6.255
129	172.16.7.0/31	172.16.7.0 – 172.16.7.1	172.16.7.1
130	172.16.7.2/31	172.16.7.2 – 172.16.7.3	172.16.7.3
131	172.16.7.4/31	172.16.7.4 – 172.16.7.5	172.16.7.5
132	172.16.7.6/31	172.16.7.6 – 172.16.7.7	172.16.7.7
133	172.16.7.8/31	172.16.7.8 – 172.16.7.9	172.16.7.9
134	172.16.7.10/31	172.16.7.10 – 172.16.7.11	172.16.7.11
135	172.16.7.12/31	172.16.7.12 – 172.16.7.13	172.16.7.13
136	172.16.7.14/31	172.16.7.14 – 172.16.7.15	172.16.7.15
137	172.16.7.16/31	172.16.7.16 – 172.16.7.17	172.16.7.17
138	172.16.7.18/31	172.16.7.18 – 172.16.7.19	172.16.7.19
139	172.16.7.20/31	172.16.7.20 – 172.16.7.21	172.16.7.21
140	172.16.7.22/31	172.16.7.22 – 172.16.7.23	172.16.7.23
141	172.16.7.24/31	172.16.7.24 – 172.16.7.25	172.16.7.25
142	172.16.7.26/31	172.16.7.26 – 172.16.7.27	172.16.7.27
143	172.16.7.28/31	172.16.7.28 – 172.16.7.29	172.16.7.29
144	172.16.7.30/31	172.16.7.30 – 172.16.7.31	172.16.7.31
145	172.16.7.32/31	172.16.7.32 – 172.16.7.33	172.16.7.33
146	172.16.7.34/31	172.16.7.34 – 172.16.7.35	172.16.7.35
147	172.16.7.36/31	172.16.7.36 – 172.16.7.37	172.16.7.37
148	172.16.7.38/31	172.16.7.38 – 172.16.7.39	172.16.7.39
149	172.16.7.40/31	172.16.7.40 – 172.16.7.41	172.16.7.41
150	172.16.7.42/31	172.16.7.42 – 172.16.7.43	172.16.7.43
151	172.16.7.44/31	172.16.7.44 – 172.16.7.45	172.16.7.45
152	172.16.7.46/31	172.16.7.46 – 172.16.7.47	172.16.7.47
153	172.16.7.48/31	172.16.7.48 – 172.16.7.49	172.16.7.49
154	172.16.7.50/31	172.16.7.50 – 172.16.7.51	172.16.7.51
155	172.16.7.52/31	172.16.7.52 – 172.16.7.53	172.16.7.53
156	172.16.7.54/31	172.16.7.54 – 172.16.7.55	172.16.7.55
157	172.16.7.56/31	172.16.7.56 – 172.16.7.57	172.16.7.57
158	172.16.7.58/31	172.16.7.58 – 172.16.7.59	172.16.7.59
159	172.16.7.60/31	172.16.7.60 – 172.16.7.61	172.16.7.61
160	172.16.7.62/31	172.16.7.62 – 172.16.7.63	172.16.7.63
161	172.16.7.64/31	172.16.7.64 – 172.16.7.65	172.16.7.65
162	172.16.7.66/31	172.16.7.66 – 172.16.7.67	172.16.7.67
163	172.16.7.68/31	172.16.7.68 – 172.16.7.69	172.16.7.69
164	172.16.7.70/31	172.16.7.70 – 172.16.7.71	172.16.7.71
165	172.16.7.72/31	172.16.7.72 – 172.16.7.73	172.16.7.73
166	172.16.7.74/31	172.16.7.74 – 172.16.7.75	172.16.7.75
167	172.16.7.76/31	172.16.7.76 – 172.16.7.77	172.16.7.77
168	172.16.7.78/31	172.16.7.78 – 172.16.7.79	172.16.7.79
169	172.16.7.80/31	172.16.7.80 – 172.16.7.81	172.16.7.81
170	172.16.7.82/31	172.16.7.82 – 172.16.7.83	172.16.7.83
171	172.16.7.84/31	172.16.7.84 – 172.16.7.85	172.16.7.85
172	172.16.7.86/31	172.16.7.86 – 172.16.7.87	172.16.7.87
173	172.16.7.88/31	172.16.7.88 – 172.16.7.89	172.16.7.89
174	172.16.7.90/31	172.16.7.90 – 172.16.7.91	172.16.7.91
175	172.16.7.92/31	172.16.7.92 – 172.16.7.93	172.16.7.93
176	172.16.7.94/31	172.16.7.94 – 172.16.7.95	172.16.7.95
177	172.16.7.96/31	172.16.7.96 – 172.16.7.97	172.16.7.97
178	172.16.7.98/31	172.16.7.98 – 172.16.7.99	172.16.7.99
179	172.16.7.100/31	172.16.7.100 – 172.16.7.101	172.16.7.101
180	172.16.7.102/31	172.16.7.102 – 172.16.7.103	172.16.7.103
181	172.16.7.104/31	172.16.7.104 – 172.16.7.105	172.16.7.105
182	172.16.7.106/31	172.16.7.106 – 172.16.7.107	172.16.7.107
183	172.16.7.108/31	172.16.7.108 – 172.16.7.109	172.16.7.109
184	172.16.7.110/31	172.16.7.110 – 172.16.7.111	172.16.7.111
185	172.16.7.112/31	172.16.7.112 – 172.16.7.113	172.16.7.113
186	172.16.7.114/31	172.16.7.114 – 172.16.7.115	172.16.7.115
187	172.16.7.116/31	172.16.7.116 – 172.16.7.117	172.16.7.117
188	172.16.7.118/31	172.16.7.118 – 172.16.7.119	172.16.7.119
189	172.16.7.120/31	172.16.7.120 – 172.16.7.121	172.16.7.121
190	172.16.7.122/31	172.16.7.122 – 172.16.7.123	172.16.7.123
191	172.16.7.124/31	172.16.7.124 – 172.16.7.125	172.16.7.125
192	172.16.7.126/31	172.16.7.126 – 172.16.7.127	172.16.7.127
193	172.16.7.128/31	172.16.7.128 – 172.16.7.129	172.16.7.129
194	172.16.7.130/31	172.16.7.130 – 172.16.7.131	172.16.7.131
195	172.16.7.132/31	172.16.7.132 – 172.16.7.133	172.16.7.133
196	172.16.7.134/31	172.16.7.134 – 172.16.7.135	172.16.7.135
197	172.16.7.136/31	172.16.7.136 – 172.16.7.137	172.16.7.137
198	172.16.7.138/31	172.16.7.138 – 172.16.7.139	172.16.7.139
199	172.16.7.140/31	172.16.7.140 – 172.16.7.141	172.16.7.141
200	172.16.7.142/31	172.16.7.142 – 172.16.7.143	172.16.7.143
201	172.16.7.144/31	172.16.7.144 – 172.16.7.145	172.16.7.145
202	172.16.7.146/31	172.16.7.146 – 172.16.7.147	172.16.7.147
203	172.16.7.148/31	172.16.7.148 – 172.16.7.149	172.16.7.149
204	172.16.7.150/31	172.16.7.150 – 172.16.7.151	172.16.7.151
205	172.16.7.152/31	172.16.7.152 – 172.16.7.153	172.16.7.153
206	172.16.7.154/31	172.16.7.154 – 172.16.7.155	172.16.7.155
207	172.16.7.156/31	172.16.7.156 – 172.16.7.157	172.16.7.157
208	172.16.7.158/31	172.16.7.158 – 172.16.7.159	172.16.7.159
209	172.16.7.160/31	172.16.7.160 – 172.16.7.161	172.16.7.161
210	172.16.7.162/31	172.16.7.162 – 172.16.7.163	172.16.7.163
211	172.16.7.164/31	172.16.7.164 – 172.16.7.165	172.16.7.165
212	172.16.7.166/31	172.16.7.166 – 172.16.7.167	172.16.7.167
213	172.16.7.168/31	172.16.7.168 – 172.16.7.169	172.16.7.169
214	172.16.7.170/31	172.16.7.170 – 172.16.7.171	172.16.7.171
215	172.16.7.172/31	172.16.7.172 – 172.16.7.173	172.16.7.173
216	172.16.7.174/31	172.16.7.174 – 172.16.7.175	172.16.7.175
217	172.16.7.176/31	172.16.7.176 – 172.16.7.177	172.16.7.177
218	172.16.7.178/31	172.16.7.178 – 172.16.7.179	172.16.7.179
219	172.16.7.180/31	172.16.7.180 – 172.16.7.181	172.16.7.181
220	172.16.7.182/31	172.16.7.182 – 172.16.7.183	172.16.7.183
221	172.16.7.184/31	172.16.7.184 – 172.16.7.185	172.16.7.185
222	172.16.7.186/31	172.16.7.186 – 172.16.7.187	172.16.7.187
223	172.16.7.188/31	172.16.7.188 – 172.16.7.189	172.16.7.189
224	172.16.7.190/31	172.16.7.190 – 172.16.7.191	172.16.7.191
225	172.16.7.192/31	172.16.7.192 – 172.16.7.193	172.16.7.193
226	172.16.7.194/31	172.16.7.194 – 172.16.7.195	172.16.7.195
227	172.16.7.196/31	172.16.7.196 – 172.16.7.197	172.16.7.197
228	172.16.7.198/31	172.16.7.198 – 172.16.7.199	172.16.7.199
229	172.16.7.200/31	172.16.7.200 – 172.16.7.201	172.16.7.201
230	172.16.7.202/31	172.16.7.202 – 172.16.7.203	172.16.7.203
231	172.16.7.204/31	172.16.7.204 – 172.16.7.205	172.16.7.205
232	172.16.7.206/31	172.16.7.206 – 172.16.7.207	172.16.7.207
233	172.16.7.208/31	172.16.7.208 – 172.16.7.209	172.16.7.209
234	172.16.7.210/31	172.16.7.210 – 172.16.7.211	172.16.7.211
235	172.16.7.212/31	172.16.7.212 – 172.16.7.213	172.16.7.213
236	172.16.7.214/31	172.16.7.214 – 172.16.7.215	172.16.7.215
237	172.16.7.216/31	172.16.7.216 – 172.16.7.217	172.16.7.217
238	172.16.7.218/31	172.16.7.218 – 172.16.7.219	172.16.7.219
239	172.16.7.220/31	172.16.7.220 – 172.16.7.221	172.16.7.221
240	172.16.7.222/31	172.16.7.222 – 172.16.7.223	172.16.7.223
241	172.16.7.224/31	172.16.7.224 – 172.16.7.225	172.16.7.225
242	172.16.7.226/31	172.16.7.226 – 172.16.7.227	172.16.7.227
243	172.16.7.228/31	172.16.7.228 – 172.16.7.229	172.16.7.229
244	172.16.7.230/31	172.16.7.230 – 172.16.7.231	172.16.7.231
245	172.16.7.232/31	172.16.7.232 – 172.16.7.233	172.16.7.233
246	172.16.7.234/31	172.16.7.234 – 172.16.7.235	172.16.7.235
247	172.16.7.236/31	172.16.7.236 – 172.16.7.237	172.16.7.237
248	172.16.7.238/31	172.16.7.238 – 172.16.7.239	172.16.7.239
249	172.16.7.240/31	172.16.7.240 – 172.16.7.241	172.16.7.241
250	172.16.7.242/31	172.16.7.242 – 172.16.7.243	172.16.7.243
251	172.16.7.244/31	172.16.7.244 – 172.16.7.245	172.16.7.245
252	172.16.7.246/31	172.16.7.246 – 172.16.7.247	172.16.7.247
253	172.16.7.248/31	172.16.7.248 – 172.16.7.249	172.16.7.249
254	172.16.7.250/31	172.16.7.250 – 172.16.7.251	172.16.7.251
255	172.16.7.252/31	172.16.7.252 – 172.16.7.253	172.16.7.253
256	172.16.7.254/31	172.16.7.254 – 172.16.7.255	172.16.7.255

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 /23
/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	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →