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)10.2.122.0/23

network10.2.122.0/23

broadcast10.2.123.255

first host10.2.122.1

last host10.2.123.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.122.0/23

address00001010.00000010.01111010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01111010.00000000

broadcast00001010.00000010.01111011.11111111

green = network part, grey = host part

hex0x0a027a00

decimal167934464

reverse dns0.122.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7a00

/23 split into /31 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.122.0/31	10.2.122.0 – 10.2.122.1	10.2.122.1
2	10.2.122.2/31	10.2.122.2 – 10.2.122.3	10.2.122.3
3	10.2.122.4/31	10.2.122.4 – 10.2.122.5	10.2.122.5
4	10.2.122.6/31	10.2.122.6 – 10.2.122.7	10.2.122.7
5	10.2.122.8/31	10.2.122.8 – 10.2.122.9	10.2.122.9
6	10.2.122.10/31	10.2.122.10 – 10.2.122.11	10.2.122.11
7	10.2.122.12/31	10.2.122.12 – 10.2.122.13	10.2.122.13
8	10.2.122.14/31	10.2.122.14 – 10.2.122.15	10.2.122.15
9	10.2.122.16/31	10.2.122.16 – 10.2.122.17	10.2.122.17
10	10.2.122.18/31	10.2.122.18 – 10.2.122.19	10.2.122.19
11	10.2.122.20/31	10.2.122.20 – 10.2.122.21	10.2.122.21
12	10.2.122.22/31	10.2.122.22 – 10.2.122.23	10.2.122.23
13	10.2.122.24/31	10.2.122.24 – 10.2.122.25	10.2.122.25
14	10.2.122.26/31	10.2.122.26 – 10.2.122.27	10.2.122.27
15	10.2.122.28/31	10.2.122.28 – 10.2.122.29	10.2.122.29
16	10.2.122.30/31	10.2.122.30 – 10.2.122.31	10.2.122.31
17	10.2.122.32/31	10.2.122.32 – 10.2.122.33	10.2.122.33
18	10.2.122.34/31	10.2.122.34 – 10.2.122.35	10.2.122.35
19	10.2.122.36/31	10.2.122.36 – 10.2.122.37	10.2.122.37
20	10.2.122.38/31	10.2.122.38 – 10.2.122.39	10.2.122.39
21	10.2.122.40/31	10.2.122.40 – 10.2.122.41	10.2.122.41
22	10.2.122.42/31	10.2.122.42 – 10.2.122.43	10.2.122.43
23	10.2.122.44/31	10.2.122.44 – 10.2.122.45	10.2.122.45
24	10.2.122.46/31	10.2.122.46 – 10.2.122.47	10.2.122.47
25	10.2.122.48/31	10.2.122.48 – 10.2.122.49	10.2.122.49
26	10.2.122.50/31	10.2.122.50 – 10.2.122.51	10.2.122.51
27	10.2.122.52/31	10.2.122.52 – 10.2.122.53	10.2.122.53
28	10.2.122.54/31	10.2.122.54 – 10.2.122.55	10.2.122.55
29	10.2.122.56/31	10.2.122.56 – 10.2.122.57	10.2.122.57
30	10.2.122.58/31	10.2.122.58 – 10.2.122.59	10.2.122.59
31	10.2.122.60/31	10.2.122.60 – 10.2.122.61	10.2.122.61
32	10.2.122.62/31	10.2.122.62 – 10.2.122.63	10.2.122.63
33	10.2.122.64/31	10.2.122.64 – 10.2.122.65	10.2.122.65
34	10.2.122.66/31	10.2.122.66 – 10.2.122.67	10.2.122.67
35	10.2.122.68/31	10.2.122.68 – 10.2.122.69	10.2.122.69
36	10.2.122.70/31	10.2.122.70 – 10.2.122.71	10.2.122.71
37	10.2.122.72/31	10.2.122.72 – 10.2.122.73	10.2.122.73
38	10.2.122.74/31	10.2.122.74 – 10.2.122.75	10.2.122.75
39	10.2.122.76/31	10.2.122.76 – 10.2.122.77	10.2.122.77
40	10.2.122.78/31	10.2.122.78 – 10.2.122.79	10.2.122.79
41	10.2.122.80/31	10.2.122.80 – 10.2.122.81	10.2.122.81
42	10.2.122.82/31	10.2.122.82 – 10.2.122.83	10.2.122.83
43	10.2.122.84/31	10.2.122.84 – 10.2.122.85	10.2.122.85
44	10.2.122.86/31	10.2.122.86 – 10.2.122.87	10.2.122.87
45	10.2.122.88/31	10.2.122.88 – 10.2.122.89	10.2.122.89
46	10.2.122.90/31	10.2.122.90 – 10.2.122.91	10.2.122.91
47	10.2.122.92/31	10.2.122.92 – 10.2.122.93	10.2.122.93
48	10.2.122.94/31	10.2.122.94 – 10.2.122.95	10.2.122.95
49	10.2.122.96/31	10.2.122.96 – 10.2.122.97	10.2.122.97
50	10.2.122.98/31	10.2.122.98 – 10.2.122.99	10.2.122.99
51	10.2.122.100/31	10.2.122.100 – 10.2.122.101	10.2.122.101
52	10.2.122.102/31	10.2.122.102 – 10.2.122.103	10.2.122.103
53	10.2.122.104/31	10.2.122.104 – 10.2.122.105	10.2.122.105
54	10.2.122.106/31	10.2.122.106 – 10.2.122.107	10.2.122.107
55	10.2.122.108/31	10.2.122.108 – 10.2.122.109	10.2.122.109
56	10.2.122.110/31	10.2.122.110 – 10.2.122.111	10.2.122.111
57	10.2.122.112/31	10.2.122.112 – 10.2.122.113	10.2.122.113
58	10.2.122.114/31	10.2.122.114 – 10.2.122.115	10.2.122.115
59	10.2.122.116/31	10.2.122.116 – 10.2.122.117	10.2.122.117
60	10.2.122.118/31	10.2.122.118 – 10.2.122.119	10.2.122.119
61	10.2.122.120/31	10.2.122.120 – 10.2.122.121	10.2.122.121
62	10.2.122.122/31	10.2.122.122 – 10.2.122.123	10.2.122.123
63	10.2.122.124/31	10.2.122.124 – 10.2.122.125	10.2.122.125
64	10.2.122.126/31	10.2.122.126 – 10.2.122.127	10.2.122.127
65	10.2.122.128/31	10.2.122.128 – 10.2.122.129	10.2.122.129
66	10.2.122.130/31	10.2.122.130 – 10.2.122.131	10.2.122.131
67	10.2.122.132/31	10.2.122.132 – 10.2.122.133	10.2.122.133
68	10.2.122.134/31	10.2.122.134 – 10.2.122.135	10.2.122.135
69	10.2.122.136/31	10.2.122.136 – 10.2.122.137	10.2.122.137
70	10.2.122.138/31	10.2.122.138 – 10.2.122.139	10.2.122.139
71	10.2.122.140/31	10.2.122.140 – 10.2.122.141	10.2.122.141
72	10.2.122.142/31	10.2.122.142 – 10.2.122.143	10.2.122.143
73	10.2.122.144/31	10.2.122.144 – 10.2.122.145	10.2.122.145
74	10.2.122.146/31	10.2.122.146 – 10.2.122.147	10.2.122.147
75	10.2.122.148/31	10.2.122.148 – 10.2.122.149	10.2.122.149
76	10.2.122.150/31	10.2.122.150 – 10.2.122.151	10.2.122.151
77	10.2.122.152/31	10.2.122.152 – 10.2.122.153	10.2.122.153
78	10.2.122.154/31	10.2.122.154 – 10.2.122.155	10.2.122.155
79	10.2.122.156/31	10.2.122.156 – 10.2.122.157	10.2.122.157
80	10.2.122.158/31	10.2.122.158 – 10.2.122.159	10.2.122.159
81	10.2.122.160/31	10.2.122.160 – 10.2.122.161	10.2.122.161
82	10.2.122.162/31	10.2.122.162 – 10.2.122.163	10.2.122.163
83	10.2.122.164/31	10.2.122.164 – 10.2.122.165	10.2.122.165
84	10.2.122.166/31	10.2.122.166 – 10.2.122.167	10.2.122.167
85	10.2.122.168/31	10.2.122.168 – 10.2.122.169	10.2.122.169
86	10.2.122.170/31	10.2.122.170 – 10.2.122.171	10.2.122.171
87	10.2.122.172/31	10.2.122.172 – 10.2.122.173	10.2.122.173
88	10.2.122.174/31	10.2.122.174 – 10.2.122.175	10.2.122.175
89	10.2.122.176/31	10.2.122.176 – 10.2.122.177	10.2.122.177
90	10.2.122.178/31	10.2.122.178 – 10.2.122.179	10.2.122.179
91	10.2.122.180/31	10.2.122.180 – 10.2.122.181	10.2.122.181
92	10.2.122.182/31	10.2.122.182 – 10.2.122.183	10.2.122.183
93	10.2.122.184/31	10.2.122.184 – 10.2.122.185	10.2.122.185
94	10.2.122.186/31	10.2.122.186 – 10.2.122.187	10.2.122.187
95	10.2.122.188/31	10.2.122.188 – 10.2.122.189	10.2.122.189
96	10.2.122.190/31	10.2.122.190 – 10.2.122.191	10.2.122.191
97	10.2.122.192/31	10.2.122.192 – 10.2.122.193	10.2.122.193
98	10.2.122.194/31	10.2.122.194 – 10.2.122.195	10.2.122.195
99	10.2.122.196/31	10.2.122.196 – 10.2.122.197	10.2.122.197
100	10.2.122.198/31	10.2.122.198 – 10.2.122.199	10.2.122.199
101	10.2.122.200/31	10.2.122.200 – 10.2.122.201	10.2.122.201
102	10.2.122.202/31	10.2.122.202 – 10.2.122.203	10.2.122.203
103	10.2.122.204/31	10.2.122.204 – 10.2.122.205	10.2.122.205
104	10.2.122.206/31	10.2.122.206 – 10.2.122.207	10.2.122.207
105	10.2.122.208/31	10.2.122.208 – 10.2.122.209	10.2.122.209
106	10.2.122.210/31	10.2.122.210 – 10.2.122.211	10.2.122.211
107	10.2.122.212/31	10.2.122.212 – 10.2.122.213	10.2.122.213
108	10.2.122.214/31	10.2.122.214 – 10.2.122.215	10.2.122.215
109	10.2.122.216/31	10.2.122.216 – 10.2.122.217	10.2.122.217
110	10.2.122.218/31	10.2.122.218 – 10.2.122.219	10.2.122.219
111	10.2.122.220/31	10.2.122.220 – 10.2.122.221	10.2.122.221
112	10.2.122.222/31	10.2.122.222 – 10.2.122.223	10.2.122.223
113	10.2.122.224/31	10.2.122.224 – 10.2.122.225	10.2.122.225
114	10.2.122.226/31	10.2.122.226 – 10.2.122.227	10.2.122.227
115	10.2.122.228/31	10.2.122.228 – 10.2.122.229	10.2.122.229
116	10.2.122.230/31	10.2.122.230 – 10.2.122.231	10.2.122.231
117	10.2.122.232/31	10.2.122.232 – 10.2.122.233	10.2.122.233
118	10.2.122.234/31	10.2.122.234 – 10.2.122.235	10.2.122.235
119	10.2.122.236/31	10.2.122.236 – 10.2.122.237	10.2.122.237
120	10.2.122.238/31	10.2.122.238 – 10.2.122.239	10.2.122.239
121	10.2.122.240/31	10.2.122.240 – 10.2.122.241	10.2.122.241
122	10.2.122.242/31	10.2.122.242 – 10.2.122.243	10.2.122.243
123	10.2.122.244/31	10.2.122.244 – 10.2.122.245	10.2.122.245
124	10.2.122.246/31	10.2.122.246 – 10.2.122.247	10.2.122.247
125	10.2.122.248/31	10.2.122.248 – 10.2.122.249	10.2.122.249
126	10.2.122.250/31	10.2.122.250 – 10.2.122.251	10.2.122.251
127	10.2.122.252/31	10.2.122.252 – 10.2.122.253	10.2.122.253
128	10.2.122.254/31	10.2.122.254 – 10.2.122.255	10.2.122.255
129	10.2.123.0/31	10.2.123.0 – 10.2.123.1	10.2.123.1
130	10.2.123.2/31	10.2.123.2 – 10.2.123.3	10.2.123.3
131	10.2.123.4/31	10.2.123.4 – 10.2.123.5	10.2.123.5
132	10.2.123.6/31	10.2.123.6 – 10.2.123.7	10.2.123.7
133	10.2.123.8/31	10.2.123.8 – 10.2.123.9	10.2.123.9
134	10.2.123.10/31	10.2.123.10 – 10.2.123.11	10.2.123.11
135	10.2.123.12/31	10.2.123.12 – 10.2.123.13	10.2.123.13
136	10.2.123.14/31	10.2.123.14 – 10.2.123.15	10.2.123.15
137	10.2.123.16/31	10.2.123.16 – 10.2.123.17	10.2.123.17
138	10.2.123.18/31	10.2.123.18 – 10.2.123.19	10.2.123.19
139	10.2.123.20/31	10.2.123.20 – 10.2.123.21	10.2.123.21
140	10.2.123.22/31	10.2.123.22 – 10.2.123.23	10.2.123.23
141	10.2.123.24/31	10.2.123.24 – 10.2.123.25	10.2.123.25
142	10.2.123.26/31	10.2.123.26 – 10.2.123.27	10.2.123.27
143	10.2.123.28/31	10.2.123.28 – 10.2.123.29	10.2.123.29
144	10.2.123.30/31	10.2.123.30 – 10.2.123.31	10.2.123.31
145	10.2.123.32/31	10.2.123.32 – 10.2.123.33	10.2.123.33
146	10.2.123.34/31	10.2.123.34 – 10.2.123.35	10.2.123.35
147	10.2.123.36/31	10.2.123.36 – 10.2.123.37	10.2.123.37
148	10.2.123.38/31	10.2.123.38 – 10.2.123.39	10.2.123.39
149	10.2.123.40/31	10.2.123.40 – 10.2.123.41	10.2.123.41
150	10.2.123.42/31	10.2.123.42 – 10.2.123.43	10.2.123.43
151	10.2.123.44/31	10.2.123.44 – 10.2.123.45	10.2.123.45
152	10.2.123.46/31	10.2.123.46 – 10.2.123.47	10.2.123.47
153	10.2.123.48/31	10.2.123.48 – 10.2.123.49	10.2.123.49
154	10.2.123.50/31	10.2.123.50 – 10.2.123.51	10.2.123.51
155	10.2.123.52/31	10.2.123.52 – 10.2.123.53	10.2.123.53
156	10.2.123.54/31	10.2.123.54 – 10.2.123.55	10.2.123.55
157	10.2.123.56/31	10.2.123.56 – 10.2.123.57	10.2.123.57
158	10.2.123.58/31	10.2.123.58 – 10.2.123.59	10.2.123.59
159	10.2.123.60/31	10.2.123.60 – 10.2.123.61	10.2.123.61
160	10.2.123.62/31	10.2.123.62 – 10.2.123.63	10.2.123.63
161	10.2.123.64/31	10.2.123.64 – 10.2.123.65	10.2.123.65
162	10.2.123.66/31	10.2.123.66 – 10.2.123.67	10.2.123.67
163	10.2.123.68/31	10.2.123.68 – 10.2.123.69	10.2.123.69
164	10.2.123.70/31	10.2.123.70 – 10.2.123.71	10.2.123.71
165	10.2.123.72/31	10.2.123.72 – 10.2.123.73	10.2.123.73
166	10.2.123.74/31	10.2.123.74 – 10.2.123.75	10.2.123.75
167	10.2.123.76/31	10.2.123.76 – 10.2.123.77	10.2.123.77
168	10.2.123.78/31	10.2.123.78 – 10.2.123.79	10.2.123.79
169	10.2.123.80/31	10.2.123.80 – 10.2.123.81	10.2.123.81
170	10.2.123.82/31	10.2.123.82 – 10.2.123.83	10.2.123.83
171	10.2.123.84/31	10.2.123.84 – 10.2.123.85	10.2.123.85
172	10.2.123.86/31	10.2.123.86 – 10.2.123.87	10.2.123.87
173	10.2.123.88/31	10.2.123.88 – 10.2.123.89	10.2.123.89
174	10.2.123.90/31	10.2.123.90 – 10.2.123.91	10.2.123.91
175	10.2.123.92/31	10.2.123.92 – 10.2.123.93	10.2.123.93
176	10.2.123.94/31	10.2.123.94 – 10.2.123.95	10.2.123.95
177	10.2.123.96/31	10.2.123.96 – 10.2.123.97	10.2.123.97
178	10.2.123.98/31	10.2.123.98 – 10.2.123.99	10.2.123.99
179	10.2.123.100/31	10.2.123.100 – 10.2.123.101	10.2.123.101
180	10.2.123.102/31	10.2.123.102 – 10.2.123.103	10.2.123.103
181	10.2.123.104/31	10.2.123.104 – 10.2.123.105	10.2.123.105
182	10.2.123.106/31	10.2.123.106 – 10.2.123.107	10.2.123.107
183	10.2.123.108/31	10.2.123.108 – 10.2.123.109	10.2.123.109
184	10.2.123.110/31	10.2.123.110 – 10.2.123.111	10.2.123.111
185	10.2.123.112/31	10.2.123.112 – 10.2.123.113	10.2.123.113
186	10.2.123.114/31	10.2.123.114 – 10.2.123.115	10.2.123.115
187	10.2.123.116/31	10.2.123.116 – 10.2.123.117	10.2.123.117
188	10.2.123.118/31	10.2.123.118 – 10.2.123.119	10.2.123.119
189	10.2.123.120/31	10.2.123.120 – 10.2.123.121	10.2.123.121
190	10.2.123.122/31	10.2.123.122 – 10.2.123.123	10.2.123.123
191	10.2.123.124/31	10.2.123.124 – 10.2.123.125	10.2.123.125
192	10.2.123.126/31	10.2.123.126 – 10.2.123.127	10.2.123.127
193	10.2.123.128/31	10.2.123.128 – 10.2.123.129	10.2.123.129
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196	10.2.123.134/31	10.2.123.134 – 10.2.123.135	10.2.123.135
197	10.2.123.136/31	10.2.123.136 – 10.2.123.137	10.2.123.137
198	10.2.123.138/31	10.2.123.138 – 10.2.123.139	10.2.123.139
199	10.2.123.140/31	10.2.123.140 – 10.2.123.141	10.2.123.141
200	10.2.123.142/31	10.2.123.142 – 10.2.123.143	10.2.123.143
201	10.2.123.144/31	10.2.123.144 – 10.2.123.145	10.2.123.145
202	10.2.123.146/31	10.2.123.146 – 10.2.123.147	10.2.123.147
203	10.2.123.148/31	10.2.123.148 – 10.2.123.149	10.2.123.149
204	10.2.123.150/31	10.2.123.150 – 10.2.123.151	10.2.123.151
205	10.2.123.152/31	10.2.123.152 – 10.2.123.153	10.2.123.153
206	10.2.123.154/31	10.2.123.154 – 10.2.123.155	10.2.123.155
207	10.2.123.156/31	10.2.123.156 – 10.2.123.157	10.2.123.157
208	10.2.123.158/31	10.2.123.158 – 10.2.123.159	10.2.123.159
209	10.2.123.160/31	10.2.123.160 – 10.2.123.161	10.2.123.161
210	10.2.123.162/31	10.2.123.162 – 10.2.123.163	10.2.123.163
211	10.2.123.164/31	10.2.123.164 – 10.2.123.165	10.2.123.165
212	10.2.123.166/31	10.2.123.166 – 10.2.123.167	10.2.123.167
213	10.2.123.168/31	10.2.123.168 – 10.2.123.169	10.2.123.169
214	10.2.123.170/31	10.2.123.170 – 10.2.123.171	10.2.123.171
215	10.2.123.172/31	10.2.123.172 – 10.2.123.173	10.2.123.173
216	10.2.123.174/31	10.2.123.174 – 10.2.123.175	10.2.123.175
217	10.2.123.176/31	10.2.123.176 – 10.2.123.177	10.2.123.177
218	10.2.123.178/31	10.2.123.178 – 10.2.123.179	10.2.123.179
219	10.2.123.180/31	10.2.123.180 – 10.2.123.181	10.2.123.181
220	10.2.123.182/31	10.2.123.182 – 10.2.123.183	10.2.123.183
221	10.2.123.184/31	10.2.123.184 – 10.2.123.185	10.2.123.185
222	10.2.123.186/31	10.2.123.186 – 10.2.123.187	10.2.123.187
223	10.2.123.188/31	10.2.123.188 – 10.2.123.189	10.2.123.189
224	10.2.123.190/31	10.2.123.190 – 10.2.123.191	10.2.123.191
225	10.2.123.192/31	10.2.123.192 – 10.2.123.193	10.2.123.193
226	10.2.123.194/31	10.2.123.194 – 10.2.123.195	10.2.123.195
227	10.2.123.196/31	10.2.123.196 – 10.2.123.197	10.2.123.197
228	10.2.123.198/31	10.2.123.198 – 10.2.123.199	10.2.123.199
229	10.2.123.200/31	10.2.123.200 – 10.2.123.201	10.2.123.201
230	10.2.123.202/31	10.2.123.202 – 10.2.123.203	10.2.123.203
231	10.2.123.204/31	10.2.123.204 – 10.2.123.205	10.2.123.205
232	10.2.123.206/31	10.2.123.206 – 10.2.123.207	10.2.123.207
233	10.2.123.208/31	10.2.123.208 – 10.2.123.209	10.2.123.209
234	10.2.123.210/31	10.2.123.210 – 10.2.123.211	10.2.123.211
235	10.2.123.212/31	10.2.123.212 – 10.2.123.213	10.2.123.213
236	10.2.123.214/31	10.2.123.214 – 10.2.123.215	10.2.123.215
237	10.2.123.216/31	10.2.123.216 – 10.2.123.217	10.2.123.217
238	10.2.123.218/31	10.2.123.218 – 10.2.123.219	10.2.123.219
239	10.2.123.220/31	10.2.123.220 – 10.2.123.221	10.2.123.221
240	10.2.123.222/31	10.2.123.222 – 10.2.123.223	10.2.123.223
241	10.2.123.224/31	10.2.123.224 – 10.2.123.225	10.2.123.225
242	10.2.123.226/31	10.2.123.226 – 10.2.123.227	10.2.123.227
243	10.2.123.228/31	10.2.123.228 – 10.2.123.229	10.2.123.229
244	10.2.123.230/31	10.2.123.230 – 10.2.123.231	10.2.123.231
245	10.2.123.232/31	10.2.123.232 – 10.2.123.233	10.2.123.233
246	10.2.123.234/31	10.2.123.234 – 10.2.123.235	10.2.123.235
247	10.2.123.236/31	10.2.123.236 – 10.2.123.237	10.2.123.237
248	10.2.123.238/31	10.2.123.238 – 10.2.123.239	10.2.123.239
249	10.2.123.240/31	10.2.123.240 – 10.2.123.241	10.2.123.241
250	10.2.123.242/31	10.2.123.242 – 10.2.123.243	10.2.123.243
251	10.2.123.244/31	10.2.123.244 – 10.2.123.245	10.2.123.245
252	10.2.123.246/31	10.2.123.246 – 10.2.123.247	10.2.123.247
253	10.2.123.248/31	10.2.123.248 – 10.2.123.249	10.2.123.249
254	10.2.123.250/31	10.2.123.250 – 10.2.123.251	10.2.123.251
255	10.2.123.252/31	10.2.123.252 – 10.2.123.253	10.2.123.253
256	10.2.123.254/31	10.2.123.254 – 10.2.123.255	10.2.123.255

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 →