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)10.51.192.0/18

network10.51.192.0/18

broadcast10.51.255.255

first host10.51.192.1

last host10.51.255.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.51.192.0/18

address00001010.00110011.11000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00110011.11000000.00000000

broadcast00001010.00110011.11111111.11111111

green = network part, grey = host part

hex0x0a33c000

decimal171163648

reverse dns0.192.51.10.in-addr.arpa

ipv4-mapped::ffff:a33:c000

/18 split into /31 · 8,192 subnets

close ×

#	network	host range	broadcast
1	10.51.192.0/31	10.51.192.0 – 10.51.192.1	10.51.192.1
2	10.51.192.2/31	10.51.192.2 – 10.51.192.3	10.51.192.3
3	10.51.192.4/31	10.51.192.4 – 10.51.192.5	10.51.192.5
4	10.51.192.6/31	10.51.192.6 – 10.51.192.7	10.51.192.7
5	10.51.192.8/31	10.51.192.8 – 10.51.192.9	10.51.192.9
6	10.51.192.10/31	10.51.192.10 – 10.51.192.11	10.51.192.11
7	10.51.192.12/31	10.51.192.12 – 10.51.192.13	10.51.192.13
8	10.51.192.14/31	10.51.192.14 – 10.51.192.15	10.51.192.15
9	10.51.192.16/31	10.51.192.16 – 10.51.192.17	10.51.192.17
10	10.51.192.18/31	10.51.192.18 – 10.51.192.19	10.51.192.19
11	10.51.192.20/31	10.51.192.20 – 10.51.192.21	10.51.192.21
12	10.51.192.22/31	10.51.192.22 – 10.51.192.23	10.51.192.23
13	10.51.192.24/31	10.51.192.24 – 10.51.192.25	10.51.192.25
14	10.51.192.26/31	10.51.192.26 – 10.51.192.27	10.51.192.27
15	10.51.192.28/31	10.51.192.28 – 10.51.192.29	10.51.192.29
16	10.51.192.30/31	10.51.192.30 – 10.51.192.31	10.51.192.31
17	10.51.192.32/31	10.51.192.32 – 10.51.192.33	10.51.192.33
18	10.51.192.34/31	10.51.192.34 – 10.51.192.35	10.51.192.35
19	10.51.192.36/31	10.51.192.36 – 10.51.192.37	10.51.192.37
20	10.51.192.38/31	10.51.192.38 – 10.51.192.39	10.51.192.39
21	10.51.192.40/31	10.51.192.40 – 10.51.192.41	10.51.192.41
22	10.51.192.42/31	10.51.192.42 – 10.51.192.43	10.51.192.43
23	10.51.192.44/31	10.51.192.44 – 10.51.192.45	10.51.192.45
24	10.51.192.46/31	10.51.192.46 – 10.51.192.47	10.51.192.47
25	10.51.192.48/31	10.51.192.48 – 10.51.192.49	10.51.192.49
26	10.51.192.50/31	10.51.192.50 – 10.51.192.51	10.51.192.51
27	10.51.192.52/31	10.51.192.52 – 10.51.192.53	10.51.192.53
28	10.51.192.54/31	10.51.192.54 – 10.51.192.55	10.51.192.55
29	10.51.192.56/31	10.51.192.56 – 10.51.192.57	10.51.192.57
30	10.51.192.58/31	10.51.192.58 – 10.51.192.59	10.51.192.59
31	10.51.192.60/31	10.51.192.60 – 10.51.192.61	10.51.192.61
32	10.51.192.62/31	10.51.192.62 – 10.51.192.63	10.51.192.63
33	10.51.192.64/31	10.51.192.64 – 10.51.192.65	10.51.192.65
34	10.51.192.66/31	10.51.192.66 – 10.51.192.67	10.51.192.67
35	10.51.192.68/31	10.51.192.68 – 10.51.192.69	10.51.192.69
36	10.51.192.70/31	10.51.192.70 – 10.51.192.71	10.51.192.71
37	10.51.192.72/31	10.51.192.72 – 10.51.192.73	10.51.192.73
38	10.51.192.74/31	10.51.192.74 – 10.51.192.75	10.51.192.75
39	10.51.192.76/31	10.51.192.76 – 10.51.192.77	10.51.192.77
40	10.51.192.78/31	10.51.192.78 – 10.51.192.79	10.51.192.79
41	10.51.192.80/31	10.51.192.80 – 10.51.192.81	10.51.192.81
42	10.51.192.82/31	10.51.192.82 – 10.51.192.83	10.51.192.83
43	10.51.192.84/31	10.51.192.84 – 10.51.192.85	10.51.192.85
44	10.51.192.86/31	10.51.192.86 – 10.51.192.87	10.51.192.87
45	10.51.192.88/31	10.51.192.88 – 10.51.192.89	10.51.192.89
46	10.51.192.90/31	10.51.192.90 – 10.51.192.91	10.51.192.91
47	10.51.192.92/31	10.51.192.92 – 10.51.192.93	10.51.192.93
48	10.51.192.94/31	10.51.192.94 – 10.51.192.95	10.51.192.95
49	10.51.192.96/31	10.51.192.96 – 10.51.192.97	10.51.192.97
50	10.51.192.98/31	10.51.192.98 – 10.51.192.99	10.51.192.99
51	10.51.192.100/31	10.51.192.100 – 10.51.192.101	10.51.192.101
52	10.51.192.102/31	10.51.192.102 – 10.51.192.103	10.51.192.103
53	10.51.192.104/31	10.51.192.104 – 10.51.192.105	10.51.192.105
54	10.51.192.106/31	10.51.192.106 – 10.51.192.107	10.51.192.107
55	10.51.192.108/31	10.51.192.108 – 10.51.192.109	10.51.192.109
56	10.51.192.110/31	10.51.192.110 – 10.51.192.111	10.51.192.111
57	10.51.192.112/31	10.51.192.112 – 10.51.192.113	10.51.192.113
58	10.51.192.114/31	10.51.192.114 – 10.51.192.115	10.51.192.115
59	10.51.192.116/31	10.51.192.116 – 10.51.192.117	10.51.192.117
60	10.51.192.118/31	10.51.192.118 – 10.51.192.119	10.51.192.119
61	10.51.192.120/31	10.51.192.120 – 10.51.192.121	10.51.192.121
62	10.51.192.122/31	10.51.192.122 – 10.51.192.123	10.51.192.123
63	10.51.192.124/31	10.51.192.124 – 10.51.192.125	10.51.192.125
64	10.51.192.126/31	10.51.192.126 – 10.51.192.127	10.51.192.127
65	10.51.192.128/31	10.51.192.128 – 10.51.192.129	10.51.192.129
66	10.51.192.130/31	10.51.192.130 – 10.51.192.131	10.51.192.131
67	10.51.192.132/31	10.51.192.132 – 10.51.192.133	10.51.192.133
68	10.51.192.134/31	10.51.192.134 – 10.51.192.135	10.51.192.135
69	10.51.192.136/31	10.51.192.136 – 10.51.192.137	10.51.192.137
70	10.51.192.138/31	10.51.192.138 – 10.51.192.139	10.51.192.139
71	10.51.192.140/31	10.51.192.140 – 10.51.192.141	10.51.192.141
72	10.51.192.142/31	10.51.192.142 – 10.51.192.143	10.51.192.143
73	10.51.192.144/31	10.51.192.144 – 10.51.192.145	10.51.192.145
74	10.51.192.146/31	10.51.192.146 – 10.51.192.147	10.51.192.147
75	10.51.192.148/31	10.51.192.148 – 10.51.192.149	10.51.192.149
76	10.51.192.150/31	10.51.192.150 – 10.51.192.151	10.51.192.151
77	10.51.192.152/31	10.51.192.152 – 10.51.192.153	10.51.192.153
78	10.51.192.154/31	10.51.192.154 – 10.51.192.155	10.51.192.155
79	10.51.192.156/31	10.51.192.156 – 10.51.192.157	10.51.192.157
80	10.51.192.158/31	10.51.192.158 – 10.51.192.159	10.51.192.159
81	10.51.192.160/31	10.51.192.160 – 10.51.192.161	10.51.192.161
82	10.51.192.162/31	10.51.192.162 – 10.51.192.163	10.51.192.163
83	10.51.192.164/31	10.51.192.164 – 10.51.192.165	10.51.192.165
84	10.51.192.166/31	10.51.192.166 – 10.51.192.167	10.51.192.167
85	10.51.192.168/31	10.51.192.168 – 10.51.192.169	10.51.192.169
86	10.51.192.170/31	10.51.192.170 – 10.51.192.171	10.51.192.171
87	10.51.192.172/31	10.51.192.172 – 10.51.192.173	10.51.192.173
88	10.51.192.174/31	10.51.192.174 – 10.51.192.175	10.51.192.175
89	10.51.192.176/31	10.51.192.176 – 10.51.192.177	10.51.192.177
90	10.51.192.178/31	10.51.192.178 – 10.51.192.179	10.51.192.179
91	10.51.192.180/31	10.51.192.180 – 10.51.192.181	10.51.192.181
92	10.51.192.182/31	10.51.192.182 – 10.51.192.183	10.51.192.183
93	10.51.192.184/31	10.51.192.184 – 10.51.192.185	10.51.192.185
94	10.51.192.186/31	10.51.192.186 – 10.51.192.187	10.51.192.187
95	10.51.192.188/31	10.51.192.188 – 10.51.192.189	10.51.192.189
96	10.51.192.190/31	10.51.192.190 – 10.51.192.191	10.51.192.191
97	10.51.192.192/31	10.51.192.192 – 10.51.192.193	10.51.192.193
98	10.51.192.194/31	10.51.192.194 – 10.51.192.195	10.51.192.195
99	10.51.192.196/31	10.51.192.196 – 10.51.192.197	10.51.192.197
100	10.51.192.198/31	10.51.192.198 – 10.51.192.199	10.51.192.199
101	10.51.192.200/31	10.51.192.200 – 10.51.192.201	10.51.192.201
102	10.51.192.202/31	10.51.192.202 – 10.51.192.203	10.51.192.203
103	10.51.192.204/31	10.51.192.204 – 10.51.192.205	10.51.192.205
104	10.51.192.206/31	10.51.192.206 – 10.51.192.207	10.51.192.207
105	10.51.192.208/31	10.51.192.208 – 10.51.192.209	10.51.192.209
106	10.51.192.210/31	10.51.192.210 – 10.51.192.211	10.51.192.211
107	10.51.192.212/31	10.51.192.212 – 10.51.192.213	10.51.192.213
108	10.51.192.214/31	10.51.192.214 – 10.51.192.215	10.51.192.215
109	10.51.192.216/31	10.51.192.216 – 10.51.192.217	10.51.192.217
110	10.51.192.218/31	10.51.192.218 – 10.51.192.219	10.51.192.219
111	10.51.192.220/31	10.51.192.220 – 10.51.192.221	10.51.192.221
112	10.51.192.222/31	10.51.192.222 – 10.51.192.223	10.51.192.223
113	10.51.192.224/31	10.51.192.224 – 10.51.192.225	10.51.192.225
114	10.51.192.226/31	10.51.192.226 – 10.51.192.227	10.51.192.227
115	10.51.192.228/31	10.51.192.228 – 10.51.192.229	10.51.192.229
116	10.51.192.230/31	10.51.192.230 – 10.51.192.231	10.51.192.231
117	10.51.192.232/31	10.51.192.232 – 10.51.192.233	10.51.192.233
118	10.51.192.234/31	10.51.192.234 – 10.51.192.235	10.51.192.235
119	10.51.192.236/31	10.51.192.236 – 10.51.192.237	10.51.192.237
120	10.51.192.238/31	10.51.192.238 – 10.51.192.239	10.51.192.239
121	10.51.192.240/31	10.51.192.240 – 10.51.192.241	10.51.192.241
122	10.51.192.242/31	10.51.192.242 – 10.51.192.243	10.51.192.243
123	10.51.192.244/31	10.51.192.244 – 10.51.192.245	10.51.192.245
124	10.51.192.246/31	10.51.192.246 – 10.51.192.247	10.51.192.247
125	10.51.192.248/31	10.51.192.248 – 10.51.192.249	10.51.192.249
126	10.51.192.250/31	10.51.192.250 – 10.51.192.251	10.51.192.251
127	10.51.192.252/31	10.51.192.252 – 10.51.192.253	10.51.192.253
128	10.51.192.254/31	10.51.192.254 – 10.51.192.255	10.51.192.255
129	10.51.193.0/31	10.51.193.0 – 10.51.193.1	10.51.193.1
130	10.51.193.2/31	10.51.193.2 – 10.51.193.3	10.51.193.3
131	10.51.193.4/31	10.51.193.4 – 10.51.193.5	10.51.193.5
132	10.51.193.6/31	10.51.193.6 – 10.51.193.7	10.51.193.7
133	10.51.193.8/31	10.51.193.8 – 10.51.193.9	10.51.193.9
134	10.51.193.10/31	10.51.193.10 – 10.51.193.11	10.51.193.11
135	10.51.193.12/31	10.51.193.12 – 10.51.193.13	10.51.193.13
136	10.51.193.14/31	10.51.193.14 – 10.51.193.15	10.51.193.15
137	10.51.193.16/31	10.51.193.16 – 10.51.193.17	10.51.193.17
138	10.51.193.18/31	10.51.193.18 – 10.51.193.19	10.51.193.19
139	10.51.193.20/31	10.51.193.20 – 10.51.193.21	10.51.193.21
140	10.51.193.22/31	10.51.193.22 – 10.51.193.23	10.51.193.23
141	10.51.193.24/31	10.51.193.24 – 10.51.193.25	10.51.193.25
142	10.51.193.26/31	10.51.193.26 – 10.51.193.27	10.51.193.27
143	10.51.193.28/31	10.51.193.28 – 10.51.193.29	10.51.193.29
144	10.51.193.30/31	10.51.193.30 – 10.51.193.31	10.51.193.31
145	10.51.193.32/31	10.51.193.32 – 10.51.193.33	10.51.193.33
146	10.51.193.34/31	10.51.193.34 – 10.51.193.35	10.51.193.35
147	10.51.193.36/31	10.51.193.36 – 10.51.193.37	10.51.193.37
148	10.51.193.38/31	10.51.193.38 – 10.51.193.39	10.51.193.39
149	10.51.193.40/31	10.51.193.40 – 10.51.193.41	10.51.193.41
150	10.51.193.42/31	10.51.193.42 – 10.51.193.43	10.51.193.43
151	10.51.193.44/31	10.51.193.44 – 10.51.193.45	10.51.193.45
152	10.51.193.46/31	10.51.193.46 – 10.51.193.47	10.51.193.47
153	10.51.193.48/31	10.51.193.48 – 10.51.193.49	10.51.193.49
154	10.51.193.50/31	10.51.193.50 – 10.51.193.51	10.51.193.51
155	10.51.193.52/31	10.51.193.52 – 10.51.193.53	10.51.193.53
156	10.51.193.54/31	10.51.193.54 – 10.51.193.55	10.51.193.55
157	10.51.193.56/31	10.51.193.56 – 10.51.193.57	10.51.193.57
158	10.51.193.58/31	10.51.193.58 – 10.51.193.59	10.51.193.59
159	10.51.193.60/31	10.51.193.60 – 10.51.193.61	10.51.193.61
160	10.51.193.62/31	10.51.193.62 – 10.51.193.63	10.51.193.63
161	10.51.193.64/31	10.51.193.64 – 10.51.193.65	10.51.193.65
162	10.51.193.66/31	10.51.193.66 – 10.51.193.67	10.51.193.67
163	10.51.193.68/31	10.51.193.68 – 10.51.193.69	10.51.193.69
164	10.51.193.70/31	10.51.193.70 – 10.51.193.71	10.51.193.71
165	10.51.193.72/31	10.51.193.72 – 10.51.193.73	10.51.193.73
166	10.51.193.74/31	10.51.193.74 – 10.51.193.75	10.51.193.75
167	10.51.193.76/31	10.51.193.76 – 10.51.193.77	10.51.193.77
168	10.51.193.78/31	10.51.193.78 – 10.51.193.79	10.51.193.79
169	10.51.193.80/31	10.51.193.80 – 10.51.193.81	10.51.193.81
170	10.51.193.82/31	10.51.193.82 – 10.51.193.83	10.51.193.83
171	10.51.193.84/31	10.51.193.84 – 10.51.193.85	10.51.193.85
172	10.51.193.86/31	10.51.193.86 – 10.51.193.87	10.51.193.87
173	10.51.193.88/31	10.51.193.88 – 10.51.193.89	10.51.193.89
174	10.51.193.90/31	10.51.193.90 – 10.51.193.91	10.51.193.91
175	10.51.193.92/31	10.51.193.92 – 10.51.193.93	10.51.193.93
176	10.51.193.94/31	10.51.193.94 – 10.51.193.95	10.51.193.95
177	10.51.193.96/31	10.51.193.96 – 10.51.193.97	10.51.193.97
178	10.51.193.98/31	10.51.193.98 – 10.51.193.99	10.51.193.99
179	10.51.193.100/31	10.51.193.100 – 10.51.193.101	10.51.193.101
180	10.51.193.102/31	10.51.193.102 – 10.51.193.103	10.51.193.103
181	10.51.193.104/31	10.51.193.104 – 10.51.193.105	10.51.193.105
182	10.51.193.106/31	10.51.193.106 – 10.51.193.107	10.51.193.107
183	10.51.193.108/31	10.51.193.108 – 10.51.193.109	10.51.193.109
184	10.51.193.110/31	10.51.193.110 – 10.51.193.111	10.51.193.111
185	10.51.193.112/31	10.51.193.112 – 10.51.193.113	10.51.193.113
186	10.51.193.114/31	10.51.193.114 – 10.51.193.115	10.51.193.115
187	10.51.193.116/31	10.51.193.116 – 10.51.193.117	10.51.193.117
188	10.51.193.118/31	10.51.193.118 – 10.51.193.119	10.51.193.119
189	10.51.193.120/31	10.51.193.120 – 10.51.193.121	10.51.193.121
190	10.51.193.122/31	10.51.193.122 – 10.51.193.123	10.51.193.123
191	10.51.193.124/31	10.51.193.124 – 10.51.193.125	10.51.193.125
192	10.51.193.126/31	10.51.193.126 – 10.51.193.127	10.51.193.127
193	10.51.193.128/31	10.51.193.128 – 10.51.193.129	10.51.193.129
194	10.51.193.130/31	10.51.193.130 – 10.51.193.131	10.51.193.131
195	10.51.193.132/31	10.51.193.132 – 10.51.193.133	10.51.193.133
196	10.51.193.134/31	10.51.193.134 – 10.51.193.135	10.51.193.135
197	10.51.193.136/31	10.51.193.136 – 10.51.193.137	10.51.193.137
198	10.51.193.138/31	10.51.193.138 – 10.51.193.139	10.51.193.139
199	10.51.193.140/31	10.51.193.140 – 10.51.193.141	10.51.193.141
200	10.51.193.142/31	10.51.193.142 – 10.51.193.143	10.51.193.143
201	10.51.193.144/31	10.51.193.144 – 10.51.193.145	10.51.193.145
202	10.51.193.146/31	10.51.193.146 – 10.51.193.147	10.51.193.147
203	10.51.193.148/31	10.51.193.148 – 10.51.193.149	10.51.193.149
204	10.51.193.150/31	10.51.193.150 – 10.51.193.151	10.51.193.151
205	10.51.193.152/31	10.51.193.152 – 10.51.193.153	10.51.193.153
206	10.51.193.154/31	10.51.193.154 – 10.51.193.155	10.51.193.155
207	10.51.193.156/31	10.51.193.156 – 10.51.193.157	10.51.193.157
208	10.51.193.158/31	10.51.193.158 – 10.51.193.159	10.51.193.159
209	10.51.193.160/31	10.51.193.160 – 10.51.193.161	10.51.193.161
210	10.51.193.162/31	10.51.193.162 – 10.51.193.163	10.51.193.163
211	10.51.193.164/31	10.51.193.164 – 10.51.193.165	10.51.193.165
212	10.51.193.166/31	10.51.193.166 – 10.51.193.167	10.51.193.167
213	10.51.193.168/31	10.51.193.168 – 10.51.193.169	10.51.193.169
214	10.51.193.170/31	10.51.193.170 – 10.51.193.171	10.51.193.171
215	10.51.193.172/31	10.51.193.172 – 10.51.193.173	10.51.193.173
216	10.51.193.174/31	10.51.193.174 – 10.51.193.175	10.51.193.175
217	10.51.193.176/31	10.51.193.176 – 10.51.193.177	10.51.193.177
218	10.51.193.178/31	10.51.193.178 – 10.51.193.179	10.51.193.179
219	10.51.193.180/31	10.51.193.180 – 10.51.193.181	10.51.193.181
220	10.51.193.182/31	10.51.193.182 – 10.51.193.183	10.51.193.183
221	10.51.193.184/31	10.51.193.184 – 10.51.193.185	10.51.193.185
222	10.51.193.186/31	10.51.193.186 – 10.51.193.187	10.51.193.187
223	10.51.193.188/31	10.51.193.188 – 10.51.193.189	10.51.193.189
224	10.51.193.190/31	10.51.193.190 – 10.51.193.191	10.51.193.191
225	10.51.193.192/31	10.51.193.192 – 10.51.193.193	10.51.193.193
226	10.51.193.194/31	10.51.193.194 – 10.51.193.195	10.51.193.195
227	10.51.193.196/31	10.51.193.196 – 10.51.193.197	10.51.193.197
228	10.51.193.198/31	10.51.193.198 – 10.51.193.199	10.51.193.199
229	10.51.193.200/31	10.51.193.200 – 10.51.193.201	10.51.193.201
230	10.51.193.202/31	10.51.193.202 – 10.51.193.203	10.51.193.203
231	10.51.193.204/31	10.51.193.204 – 10.51.193.205	10.51.193.205
232	10.51.193.206/31	10.51.193.206 – 10.51.193.207	10.51.193.207
233	10.51.193.208/31	10.51.193.208 – 10.51.193.209	10.51.193.209
234	10.51.193.210/31	10.51.193.210 – 10.51.193.211	10.51.193.211
235	10.51.193.212/31	10.51.193.212 – 10.51.193.213	10.51.193.213
236	10.51.193.214/31	10.51.193.214 – 10.51.193.215	10.51.193.215
237	10.51.193.216/31	10.51.193.216 – 10.51.193.217	10.51.193.217
238	10.51.193.218/31	10.51.193.218 – 10.51.193.219	10.51.193.219
239	10.51.193.220/31	10.51.193.220 – 10.51.193.221	10.51.193.221
240	10.51.193.222/31	10.51.193.222 – 10.51.193.223	10.51.193.223
241	10.51.193.224/31	10.51.193.224 – 10.51.193.225	10.51.193.225
242	10.51.193.226/31	10.51.193.226 – 10.51.193.227	10.51.193.227
243	10.51.193.228/31	10.51.193.228 – 10.51.193.229	10.51.193.229
244	10.51.193.230/31	10.51.193.230 – 10.51.193.231	10.51.193.231
245	10.51.193.232/31	10.51.193.232 – 10.51.193.233	10.51.193.233
246	10.51.193.234/31	10.51.193.234 – 10.51.193.235	10.51.193.235
247	10.51.193.236/31	10.51.193.236 – 10.51.193.237	10.51.193.237
248	10.51.193.238/31	10.51.193.238 – 10.51.193.239	10.51.193.239
249	10.51.193.240/31	10.51.193.240 – 10.51.193.241	10.51.193.241
250	10.51.193.242/31	10.51.193.242 – 10.51.193.243	10.51.193.243
251	10.51.193.244/31	10.51.193.244 – 10.51.193.245	10.51.193.245
252	10.51.193.246/31	10.51.193.246 – 10.51.193.247	10.51.193.247
253	10.51.193.248/31	10.51.193.248 – 10.51.193.249	10.51.193.249
254	10.51.193.250/31	10.51.193.250 – 10.51.193.251	10.51.193.251
255	10.51.193.252/31	10.51.193.252 – 10.51.193.253	10.51.193.253
256	10.51.193.254/31	10.51.193.254 – 10.51.193.255	10.51.193.255

showing 256 of 8,192

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →