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)10.2.218.0/23

network10.2.218.0/23

broadcast10.2.219.255

first host10.2.218.1

last host10.2.219.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.218.0/23

address00001010.00000010.11011010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11011010.00000000

broadcast00001010.00000010.11011011.11111111

green = network part, grey = host part

hex0x0a02da00

decimal167959040

reverse dns0.218.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:da00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.218.0/31	10.2.218.0 – 10.2.218.1	10.2.218.1
2	10.2.218.2/31	10.2.218.2 – 10.2.218.3	10.2.218.3
3	10.2.218.4/31	10.2.218.4 – 10.2.218.5	10.2.218.5
4	10.2.218.6/31	10.2.218.6 – 10.2.218.7	10.2.218.7
5	10.2.218.8/31	10.2.218.8 – 10.2.218.9	10.2.218.9
6	10.2.218.10/31	10.2.218.10 – 10.2.218.11	10.2.218.11
7	10.2.218.12/31	10.2.218.12 – 10.2.218.13	10.2.218.13
8	10.2.218.14/31	10.2.218.14 – 10.2.218.15	10.2.218.15
9	10.2.218.16/31	10.2.218.16 – 10.2.218.17	10.2.218.17
10	10.2.218.18/31	10.2.218.18 – 10.2.218.19	10.2.218.19
11	10.2.218.20/31	10.2.218.20 – 10.2.218.21	10.2.218.21
12	10.2.218.22/31	10.2.218.22 – 10.2.218.23	10.2.218.23
13	10.2.218.24/31	10.2.218.24 – 10.2.218.25	10.2.218.25
14	10.2.218.26/31	10.2.218.26 – 10.2.218.27	10.2.218.27
15	10.2.218.28/31	10.2.218.28 – 10.2.218.29	10.2.218.29
16	10.2.218.30/31	10.2.218.30 – 10.2.218.31	10.2.218.31
17	10.2.218.32/31	10.2.218.32 – 10.2.218.33	10.2.218.33
18	10.2.218.34/31	10.2.218.34 – 10.2.218.35	10.2.218.35
19	10.2.218.36/31	10.2.218.36 – 10.2.218.37	10.2.218.37
20	10.2.218.38/31	10.2.218.38 – 10.2.218.39	10.2.218.39
21	10.2.218.40/31	10.2.218.40 – 10.2.218.41	10.2.218.41
22	10.2.218.42/31	10.2.218.42 – 10.2.218.43	10.2.218.43
23	10.2.218.44/31	10.2.218.44 – 10.2.218.45	10.2.218.45
24	10.2.218.46/31	10.2.218.46 – 10.2.218.47	10.2.218.47
25	10.2.218.48/31	10.2.218.48 – 10.2.218.49	10.2.218.49
26	10.2.218.50/31	10.2.218.50 – 10.2.218.51	10.2.218.51
27	10.2.218.52/31	10.2.218.52 – 10.2.218.53	10.2.218.53
28	10.2.218.54/31	10.2.218.54 – 10.2.218.55	10.2.218.55
29	10.2.218.56/31	10.2.218.56 – 10.2.218.57	10.2.218.57
30	10.2.218.58/31	10.2.218.58 – 10.2.218.59	10.2.218.59
31	10.2.218.60/31	10.2.218.60 – 10.2.218.61	10.2.218.61
32	10.2.218.62/31	10.2.218.62 – 10.2.218.63	10.2.218.63
33	10.2.218.64/31	10.2.218.64 – 10.2.218.65	10.2.218.65
34	10.2.218.66/31	10.2.218.66 – 10.2.218.67	10.2.218.67
35	10.2.218.68/31	10.2.218.68 – 10.2.218.69	10.2.218.69
36	10.2.218.70/31	10.2.218.70 – 10.2.218.71	10.2.218.71
37	10.2.218.72/31	10.2.218.72 – 10.2.218.73	10.2.218.73
38	10.2.218.74/31	10.2.218.74 – 10.2.218.75	10.2.218.75
39	10.2.218.76/31	10.2.218.76 – 10.2.218.77	10.2.218.77
40	10.2.218.78/31	10.2.218.78 – 10.2.218.79	10.2.218.79
41	10.2.218.80/31	10.2.218.80 – 10.2.218.81	10.2.218.81
42	10.2.218.82/31	10.2.218.82 – 10.2.218.83	10.2.218.83
43	10.2.218.84/31	10.2.218.84 – 10.2.218.85	10.2.218.85
44	10.2.218.86/31	10.2.218.86 – 10.2.218.87	10.2.218.87
45	10.2.218.88/31	10.2.218.88 – 10.2.218.89	10.2.218.89
46	10.2.218.90/31	10.2.218.90 – 10.2.218.91	10.2.218.91
47	10.2.218.92/31	10.2.218.92 – 10.2.218.93	10.2.218.93
48	10.2.218.94/31	10.2.218.94 – 10.2.218.95	10.2.218.95
49	10.2.218.96/31	10.2.218.96 – 10.2.218.97	10.2.218.97
50	10.2.218.98/31	10.2.218.98 – 10.2.218.99	10.2.218.99
51	10.2.218.100/31	10.2.218.100 – 10.2.218.101	10.2.218.101
52	10.2.218.102/31	10.2.218.102 – 10.2.218.103	10.2.218.103
53	10.2.218.104/31	10.2.218.104 – 10.2.218.105	10.2.218.105
54	10.2.218.106/31	10.2.218.106 – 10.2.218.107	10.2.218.107
55	10.2.218.108/31	10.2.218.108 – 10.2.218.109	10.2.218.109
56	10.2.218.110/31	10.2.218.110 – 10.2.218.111	10.2.218.111
57	10.2.218.112/31	10.2.218.112 – 10.2.218.113	10.2.218.113
58	10.2.218.114/31	10.2.218.114 – 10.2.218.115	10.2.218.115
59	10.2.218.116/31	10.2.218.116 – 10.2.218.117	10.2.218.117
60	10.2.218.118/31	10.2.218.118 – 10.2.218.119	10.2.218.119
61	10.2.218.120/31	10.2.218.120 – 10.2.218.121	10.2.218.121
62	10.2.218.122/31	10.2.218.122 – 10.2.218.123	10.2.218.123
63	10.2.218.124/31	10.2.218.124 – 10.2.218.125	10.2.218.125
64	10.2.218.126/31	10.2.218.126 – 10.2.218.127	10.2.218.127
65	10.2.218.128/31	10.2.218.128 – 10.2.218.129	10.2.218.129
66	10.2.218.130/31	10.2.218.130 – 10.2.218.131	10.2.218.131
67	10.2.218.132/31	10.2.218.132 – 10.2.218.133	10.2.218.133
68	10.2.218.134/31	10.2.218.134 – 10.2.218.135	10.2.218.135
69	10.2.218.136/31	10.2.218.136 – 10.2.218.137	10.2.218.137
70	10.2.218.138/31	10.2.218.138 – 10.2.218.139	10.2.218.139
71	10.2.218.140/31	10.2.218.140 – 10.2.218.141	10.2.218.141
72	10.2.218.142/31	10.2.218.142 – 10.2.218.143	10.2.218.143
73	10.2.218.144/31	10.2.218.144 – 10.2.218.145	10.2.218.145
74	10.2.218.146/31	10.2.218.146 – 10.2.218.147	10.2.218.147
75	10.2.218.148/31	10.2.218.148 – 10.2.218.149	10.2.218.149
76	10.2.218.150/31	10.2.218.150 – 10.2.218.151	10.2.218.151
77	10.2.218.152/31	10.2.218.152 – 10.2.218.153	10.2.218.153
78	10.2.218.154/31	10.2.218.154 – 10.2.218.155	10.2.218.155
79	10.2.218.156/31	10.2.218.156 – 10.2.218.157	10.2.218.157
80	10.2.218.158/31	10.2.218.158 – 10.2.218.159	10.2.218.159
81	10.2.218.160/31	10.2.218.160 – 10.2.218.161	10.2.218.161
82	10.2.218.162/31	10.2.218.162 – 10.2.218.163	10.2.218.163
83	10.2.218.164/31	10.2.218.164 – 10.2.218.165	10.2.218.165
84	10.2.218.166/31	10.2.218.166 – 10.2.218.167	10.2.218.167
85	10.2.218.168/31	10.2.218.168 – 10.2.218.169	10.2.218.169
86	10.2.218.170/31	10.2.218.170 – 10.2.218.171	10.2.218.171
87	10.2.218.172/31	10.2.218.172 – 10.2.218.173	10.2.218.173
88	10.2.218.174/31	10.2.218.174 – 10.2.218.175	10.2.218.175
89	10.2.218.176/31	10.2.218.176 – 10.2.218.177	10.2.218.177
90	10.2.218.178/31	10.2.218.178 – 10.2.218.179	10.2.218.179
91	10.2.218.180/31	10.2.218.180 – 10.2.218.181	10.2.218.181
92	10.2.218.182/31	10.2.218.182 – 10.2.218.183	10.2.218.183
93	10.2.218.184/31	10.2.218.184 – 10.2.218.185	10.2.218.185
94	10.2.218.186/31	10.2.218.186 – 10.2.218.187	10.2.218.187
95	10.2.218.188/31	10.2.218.188 – 10.2.218.189	10.2.218.189
96	10.2.218.190/31	10.2.218.190 – 10.2.218.191	10.2.218.191
97	10.2.218.192/31	10.2.218.192 – 10.2.218.193	10.2.218.193
98	10.2.218.194/31	10.2.218.194 – 10.2.218.195	10.2.218.195
99	10.2.218.196/31	10.2.218.196 – 10.2.218.197	10.2.218.197
100	10.2.218.198/31	10.2.218.198 – 10.2.218.199	10.2.218.199
101	10.2.218.200/31	10.2.218.200 – 10.2.218.201	10.2.218.201
102	10.2.218.202/31	10.2.218.202 – 10.2.218.203	10.2.218.203
103	10.2.218.204/31	10.2.218.204 – 10.2.218.205	10.2.218.205
104	10.2.218.206/31	10.2.218.206 – 10.2.218.207	10.2.218.207
105	10.2.218.208/31	10.2.218.208 – 10.2.218.209	10.2.218.209
106	10.2.218.210/31	10.2.218.210 – 10.2.218.211	10.2.218.211
107	10.2.218.212/31	10.2.218.212 – 10.2.218.213	10.2.218.213
108	10.2.218.214/31	10.2.218.214 – 10.2.218.215	10.2.218.215
109	10.2.218.216/31	10.2.218.216 – 10.2.218.217	10.2.218.217
110	10.2.218.218/31	10.2.218.218 – 10.2.218.219	10.2.218.219
111	10.2.218.220/31	10.2.218.220 – 10.2.218.221	10.2.218.221
112	10.2.218.222/31	10.2.218.222 – 10.2.218.223	10.2.218.223
113	10.2.218.224/31	10.2.218.224 – 10.2.218.225	10.2.218.225
114	10.2.218.226/31	10.2.218.226 – 10.2.218.227	10.2.218.227
115	10.2.218.228/31	10.2.218.228 – 10.2.218.229	10.2.218.229
116	10.2.218.230/31	10.2.218.230 – 10.2.218.231	10.2.218.231
117	10.2.218.232/31	10.2.218.232 – 10.2.218.233	10.2.218.233
118	10.2.218.234/31	10.2.218.234 – 10.2.218.235	10.2.218.235
119	10.2.218.236/31	10.2.218.236 – 10.2.218.237	10.2.218.237
120	10.2.218.238/31	10.2.218.238 – 10.2.218.239	10.2.218.239
121	10.2.218.240/31	10.2.218.240 – 10.2.218.241	10.2.218.241
122	10.2.218.242/31	10.2.218.242 – 10.2.218.243	10.2.218.243
123	10.2.218.244/31	10.2.218.244 – 10.2.218.245	10.2.218.245
124	10.2.218.246/31	10.2.218.246 – 10.2.218.247	10.2.218.247
125	10.2.218.248/31	10.2.218.248 – 10.2.218.249	10.2.218.249
126	10.2.218.250/31	10.2.218.250 – 10.2.218.251	10.2.218.251
127	10.2.218.252/31	10.2.218.252 – 10.2.218.253	10.2.218.253
128	10.2.218.254/31	10.2.218.254 – 10.2.218.255	10.2.218.255
129	10.2.219.0/31	10.2.219.0 – 10.2.219.1	10.2.219.1
130	10.2.219.2/31	10.2.219.2 – 10.2.219.3	10.2.219.3
131	10.2.219.4/31	10.2.219.4 – 10.2.219.5	10.2.219.5
132	10.2.219.6/31	10.2.219.6 – 10.2.219.7	10.2.219.7
133	10.2.219.8/31	10.2.219.8 – 10.2.219.9	10.2.219.9
134	10.2.219.10/31	10.2.219.10 – 10.2.219.11	10.2.219.11
135	10.2.219.12/31	10.2.219.12 – 10.2.219.13	10.2.219.13
136	10.2.219.14/31	10.2.219.14 – 10.2.219.15	10.2.219.15
137	10.2.219.16/31	10.2.219.16 – 10.2.219.17	10.2.219.17
138	10.2.219.18/31	10.2.219.18 – 10.2.219.19	10.2.219.19
139	10.2.219.20/31	10.2.219.20 – 10.2.219.21	10.2.219.21
140	10.2.219.22/31	10.2.219.22 – 10.2.219.23	10.2.219.23
141	10.2.219.24/31	10.2.219.24 – 10.2.219.25	10.2.219.25
142	10.2.219.26/31	10.2.219.26 – 10.2.219.27	10.2.219.27
143	10.2.219.28/31	10.2.219.28 – 10.2.219.29	10.2.219.29
144	10.2.219.30/31	10.2.219.30 – 10.2.219.31	10.2.219.31
145	10.2.219.32/31	10.2.219.32 – 10.2.219.33	10.2.219.33
146	10.2.219.34/31	10.2.219.34 – 10.2.219.35	10.2.219.35
147	10.2.219.36/31	10.2.219.36 – 10.2.219.37	10.2.219.37
148	10.2.219.38/31	10.2.219.38 – 10.2.219.39	10.2.219.39
149	10.2.219.40/31	10.2.219.40 – 10.2.219.41	10.2.219.41
150	10.2.219.42/31	10.2.219.42 – 10.2.219.43	10.2.219.43
151	10.2.219.44/31	10.2.219.44 – 10.2.219.45	10.2.219.45
152	10.2.219.46/31	10.2.219.46 – 10.2.219.47	10.2.219.47
153	10.2.219.48/31	10.2.219.48 – 10.2.219.49	10.2.219.49
154	10.2.219.50/31	10.2.219.50 – 10.2.219.51	10.2.219.51
155	10.2.219.52/31	10.2.219.52 – 10.2.219.53	10.2.219.53
156	10.2.219.54/31	10.2.219.54 – 10.2.219.55	10.2.219.55
157	10.2.219.56/31	10.2.219.56 – 10.2.219.57	10.2.219.57
158	10.2.219.58/31	10.2.219.58 – 10.2.219.59	10.2.219.59
159	10.2.219.60/31	10.2.219.60 – 10.2.219.61	10.2.219.61
160	10.2.219.62/31	10.2.219.62 – 10.2.219.63	10.2.219.63
161	10.2.219.64/31	10.2.219.64 – 10.2.219.65	10.2.219.65
162	10.2.219.66/31	10.2.219.66 – 10.2.219.67	10.2.219.67
163	10.2.219.68/31	10.2.219.68 – 10.2.219.69	10.2.219.69
164	10.2.219.70/31	10.2.219.70 – 10.2.219.71	10.2.219.71
165	10.2.219.72/31	10.2.219.72 – 10.2.219.73	10.2.219.73
166	10.2.219.74/31	10.2.219.74 – 10.2.219.75	10.2.219.75
167	10.2.219.76/31	10.2.219.76 – 10.2.219.77	10.2.219.77
168	10.2.219.78/31	10.2.219.78 – 10.2.219.79	10.2.219.79
169	10.2.219.80/31	10.2.219.80 – 10.2.219.81	10.2.219.81
170	10.2.219.82/31	10.2.219.82 – 10.2.219.83	10.2.219.83
171	10.2.219.84/31	10.2.219.84 – 10.2.219.85	10.2.219.85
172	10.2.219.86/31	10.2.219.86 – 10.2.219.87	10.2.219.87
173	10.2.219.88/31	10.2.219.88 – 10.2.219.89	10.2.219.89
174	10.2.219.90/31	10.2.219.90 – 10.2.219.91	10.2.219.91
175	10.2.219.92/31	10.2.219.92 – 10.2.219.93	10.2.219.93
176	10.2.219.94/31	10.2.219.94 – 10.2.219.95	10.2.219.95
177	10.2.219.96/31	10.2.219.96 – 10.2.219.97	10.2.219.97
178	10.2.219.98/31	10.2.219.98 – 10.2.219.99	10.2.219.99
179	10.2.219.100/31	10.2.219.100 – 10.2.219.101	10.2.219.101
180	10.2.219.102/31	10.2.219.102 – 10.2.219.103	10.2.219.103
181	10.2.219.104/31	10.2.219.104 – 10.2.219.105	10.2.219.105
182	10.2.219.106/31	10.2.219.106 – 10.2.219.107	10.2.219.107
183	10.2.219.108/31	10.2.219.108 – 10.2.219.109	10.2.219.109
184	10.2.219.110/31	10.2.219.110 – 10.2.219.111	10.2.219.111
185	10.2.219.112/31	10.2.219.112 – 10.2.219.113	10.2.219.113
186	10.2.219.114/31	10.2.219.114 – 10.2.219.115	10.2.219.115
187	10.2.219.116/31	10.2.219.116 – 10.2.219.117	10.2.219.117
188	10.2.219.118/31	10.2.219.118 – 10.2.219.119	10.2.219.119
189	10.2.219.120/31	10.2.219.120 – 10.2.219.121	10.2.219.121
190	10.2.219.122/31	10.2.219.122 – 10.2.219.123	10.2.219.123
191	10.2.219.124/31	10.2.219.124 – 10.2.219.125	10.2.219.125
192	10.2.219.126/31	10.2.219.126 – 10.2.219.127	10.2.219.127
193	10.2.219.128/31	10.2.219.128 – 10.2.219.129	10.2.219.129
194	10.2.219.130/31	10.2.219.130 – 10.2.219.131	10.2.219.131
195	10.2.219.132/31	10.2.219.132 – 10.2.219.133	10.2.219.133
196	10.2.219.134/31	10.2.219.134 – 10.2.219.135	10.2.219.135
197	10.2.219.136/31	10.2.219.136 – 10.2.219.137	10.2.219.137
198	10.2.219.138/31	10.2.219.138 – 10.2.219.139	10.2.219.139
199	10.2.219.140/31	10.2.219.140 – 10.2.219.141	10.2.219.141
200	10.2.219.142/31	10.2.219.142 – 10.2.219.143	10.2.219.143
201	10.2.219.144/31	10.2.219.144 – 10.2.219.145	10.2.219.145
202	10.2.219.146/31	10.2.219.146 – 10.2.219.147	10.2.219.147
203	10.2.219.148/31	10.2.219.148 – 10.2.219.149	10.2.219.149
204	10.2.219.150/31	10.2.219.150 – 10.2.219.151	10.2.219.151
205	10.2.219.152/31	10.2.219.152 – 10.2.219.153	10.2.219.153
206	10.2.219.154/31	10.2.219.154 – 10.2.219.155	10.2.219.155
207	10.2.219.156/31	10.2.219.156 – 10.2.219.157	10.2.219.157
208	10.2.219.158/31	10.2.219.158 – 10.2.219.159	10.2.219.159
209	10.2.219.160/31	10.2.219.160 – 10.2.219.161	10.2.219.161
210	10.2.219.162/31	10.2.219.162 – 10.2.219.163	10.2.219.163
211	10.2.219.164/31	10.2.219.164 – 10.2.219.165	10.2.219.165
212	10.2.219.166/31	10.2.219.166 – 10.2.219.167	10.2.219.167
213	10.2.219.168/31	10.2.219.168 – 10.2.219.169	10.2.219.169
214	10.2.219.170/31	10.2.219.170 – 10.2.219.171	10.2.219.171
215	10.2.219.172/31	10.2.219.172 – 10.2.219.173	10.2.219.173
216	10.2.219.174/31	10.2.219.174 – 10.2.219.175	10.2.219.175
217	10.2.219.176/31	10.2.219.176 – 10.2.219.177	10.2.219.177
218	10.2.219.178/31	10.2.219.178 – 10.2.219.179	10.2.219.179
219	10.2.219.180/31	10.2.219.180 – 10.2.219.181	10.2.219.181
220	10.2.219.182/31	10.2.219.182 – 10.2.219.183	10.2.219.183
221	10.2.219.184/31	10.2.219.184 – 10.2.219.185	10.2.219.185
222	10.2.219.186/31	10.2.219.186 – 10.2.219.187	10.2.219.187
223	10.2.219.188/31	10.2.219.188 – 10.2.219.189	10.2.219.189
224	10.2.219.190/31	10.2.219.190 – 10.2.219.191	10.2.219.191
225	10.2.219.192/31	10.2.219.192 – 10.2.219.193	10.2.219.193
226	10.2.219.194/31	10.2.219.194 – 10.2.219.195	10.2.219.195
227	10.2.219.196/31	10.2.219.196 – 10.2.219.197	10.2.219.197
228	10.2.219.198/31	10.2.219.198 – 10.2.219.199	10.2.219.199
229	10.2.219.200/31	10.2.219.200 – 10.2.219.201	10.2.219.201
230	10.2.219.202/31	10.2.219.202 – 10.2.219.203	10.2.219.203
231	10.2.219.204/31	10.2.219.204 – 10.2.219.205	10.2.219.205
232	10.2.219.206/31	10.2.219.206 – 10.2.219.207	10.2.219.207
233	10.2.219.208/31	10.2.219.208 – 10.2.219.209	10.2.219.209
234	10.2.219.210/31	10.2.219.210 – 10.2.219.211	10.2.219.211
235	10.2.219.212/31	10.2.219.212 – 10.2.219.213	10.2.219.213
236	10.2.219.214/31	10.2.219.214 – 10.2.219.215	10.2.219.215
237	10.2.219.216/31	10.2.219.216 – 10.2.219.217	10.2.219.217
238	10.2.219.218/31	10.2.219.218 – 10.2.219.219	10.2.219.219
239	10.2.219.220/31	10.2.219.220 – 10.2.219.221	10.2.219.221
240	10.2.219.222/31	10.2.219.222 – 10.2.219.223	10.2.219.223
241	10.2.219.224/31	10.2.219.224 – 10.2.219.225	10.2.219.225
242	10.2.219.226/31	10.2.219.226 – 10.2.219.227	10.2.219.227
243	10.2.219.228/31	10.2.219.228 – 10.2.219.229	10.2.219.229
244	10.2.219.230/31	10.2.219.230 – 10.2.219.231	10.2.219.231
245	10.2.219.232/31	10.2.219.232 – 10.2.219.233	10.2.219.233
246	10.2.219.234/31	10.2.219.234 – 10.2.219.235	10.2.219.235
247	10.2.219.236/31	10.2.219.236 – 10.2.219.237	10.2.219.237
248	10.2.219.238/31	10.2.219.238 – 10.2.219.239	10.2.219.239
249	10.2.219.240/31	10.2.219.240 – 10.2.219.241	10.2.219.241
250	10.2.219.242/31	10.2.219.242 – 10.2.219.243	10.2.219.243
251	10.2.219.244/31	10.2.219.244 – 10.2.219.245	10.2.219.245
252	10.2.219.246/31	10.2.219.246 – 10.2.219.247	10.2.219.247
253	10.2.219.248/31	10.2.219.248 – 10.2.219.249	10.2.219.249
254	10.2.219.250/31	10.2.219.250 – 10.2.219.251	10.2.219.251
255	10.2.219.252/31	10.2.219.252 – 10.2.219.253	10.2.219.253
256	10.2.219.254/31	10.2.219.254 – 10.2.219.255	10.2.219.255

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 →