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)10.5.64.0/21

network10.5.64.0/21

broadcast10.5.71.255

first host10.5.64.1

last host10.5.71.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.64.0/21

address00001010.00000101.01000000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.01000000.00000000

broadcast00001010.00000101.01000111.11111111

green = network part, grey = host part

hex0x0a054000

decimal168116224

reverse dns0.64.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:4000

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.5.64.0/31	10.5.64.0 – 10.5.64.1	10.5.64.1
2	10.5.64.2/31	10.5.64.2 – 10.5.64.3	10.5.64.3
3	10.5.64.4/31	10.5.64.4 – 10.5.64.5	10.5.64.5
4	10.5.64.6/31	10.5.64.6 – 10.5.64.7	10.5.64.7
5	10.5.64.8/31	10.5.64.8 – 10.5.64.9	10.5.64.9
6	10.5.64.10/31	10.5.64.10 – 10.5.64.11	10.5.64.11
7	10.5.64.12/31	10.5.64.12 – 10.5.64.13	10.5.64.13
8	10.5.64.14/31	10.5.64.14 – 10.5.64.15	10.5.64.15
9	10.5.64.16/31	10.5.64.16 – 10.5.64.17	10.5.64.17
10	10.5.64.18/31	10.5.64.18 – 10.5.64.19	10.5.64.19
11	10.5.64.20/31	10.5.64.20 – 10.5.64.21	10.5.64.21
12	10.5.64.22/31	10.5.64.22 – 10.5.64.23	10.5.64.23
13	10.5.64.24/31	10.5.64.24 – 10.5.64.25	10.5.64.25
14	10.5.64.26/31	10.5.64.26 – 10.5.64.27	10.5.64.27
15	10.5.64.28/31	10.5.64.28 – 10.5.64.29	10.5.64.29
16	10.5.64.30/31	10.5.64.30 – 10.5.64.31	10.5.64.31
17	10.5.64.32/31	10.5.64.32 – 10.5.64.33	10.5.64.33
18	10.5.64.34/31	10.5.64.34 – 10.5.64.35	10.5.64.35
19	10.5.64.36/31	10.5.64.36 – 10.5.64.37	10.5.64.37
20	10.5.64.38/31	10.5.64.38 – 10.5.64.39	10.5.64.39
21	10.5.64.40/31	10.5.64.40 – 10.5.64.41	10.5.64.41
22	10.5.64.42/31	10.5.64.42 – 10.5.64.43	10.5.64.43
23	10.5.64.44/31	10.5.64.44 – 10.5.64.45	10.5.64.45
24	10.5.64.46/31	10.5.64.46 – 10.5.64.47	10.5.64.47
25	10.5.64.48/31	10.5.64.48 – 10.5.64.49	10.5.64.49
26	10.5.64.50/31	10.5.64.50 – 10.5.64.51	10.5.64.51
27	10.5.64.52/31	10.5.64.52 – 10.5.64.53	10.5.64.53
28	10.5.64.54/31	10.5.64.54 – 10.5.64.55	10.5.64.55
29	10.5.64.56/31	10.5.64.56 – 10.5.64.57	10.5.64.57
30	10.5.64.58/31	10.5.64.58 – 10.5.64.59	10.5.64.59
31	10.5.64.60/31	10.5.64.60 – 10.5.64.61	10.5.64.61
32	10.5.64.62/31	10.5.64.62 – 10.5.64.63	10.5.64.63
33	10.5.64.64/31	10.5.64.64 – 10.5.64.65	10.5.64.65
34	10.5.64.66/31	10.5.64.66 – 10.5.64.67	10.5.64.67
35	10.5.64.68/31	10.5.64.68 – 10.5.64.69	10.5.64.69
36	10.5.64.70/31	10.5.64.70 – 10.5.64.71	10.5.64.71
37	10.5.64.72/31	10.5.64.72 – 10.5.64.73	10.5.64.73
38	10.5.64.74/31	10.5.64.74 – 10.5.64.75	10.5.64.75
39	10.5.64.76/31	10.5.64.76 – 10.5.64.77	10.5.64.77
40	10.5.64.78/31	10.5.64.78 – 10.5.64.79	10.5.64.79
41	10.5.64.80/31	10.5.64.80 – 10.5.64.81	10.5.64.81
42	10.5.64.82/31	10.5.64.82 – 10.5.64.83	10.5.64.83
43	10.5.64.84/31	10.5.64.84 – 10.5.64.85	10.5.64.85
44	10.5.64.86/31	10.5.64.86 – 10.5.64.87	10.5.64.87
45	10.5.64.88/31	10.5.64.88 – 10.5.64.89	10.5.64.89
46	10.5.64.90/31	10.5.64.90 – 10.5.64.91	10.5.64.91
47	10.5.64.92/31	10.5.64.92 – 10.5.64.93	10.5.64.93
48	10.5.64.94/31	10.5.64.94 – 10.5.64.95	10.5.64.95
49	10.5.64.96/31	10.5.64.96 – 10.5.64.97	10.5.64.97
50	10.5.64.98/31	10.5.64.98 – 10.5.64.99	10.5.64.99
51	10.5.64.100/31	10.5.64.100 – 10.5.64.101	10.5.64.101
52	10.5.64.102/31	10.5.64.102 – 10.5.64.103	10.5.64.103
53	10.5.64.104/31	10.5.64.104 – 10.5.64.105	10.5.64.105
54	10.5.64.106/31	10.5.64.106 – 10.5.64.107	10.5.64.107
55	10.5.64.108/31	10.5.64.108 – 10.5.64.109	10.5.64.109
56	10.5.64.110/31	10.5.64.110 – 10.5.64.111	10.5.64.111
57	10.5.64.112/31	10.5.64.112 – 10.5.64.113	10.5.64.113
58	10.5.64.114/31	10.5.64.114 – 10.5.64.115	10.5.64.115
59	10.5.64.116/31	10.5.64.116 – 10.5.64.117	10.5.64.117
60	10.5.64.118/31	10.5.64.118 – 10.5.64.119	10.5.64.119
61	10.5.64.120/31	10.5.64.120 – 10.5.64.121	10.5.64.121
62	10.5.64.122/31	10.5.64.122 – 10.5.64.123	10.5.64.123
63	10.5.64.124/31	10.5.64.124 – 10.5.64.125	10.5.64.125
64	10.5.64.126/31	10.5.64.126 – 10.5.64.127	10.5.64.127
65	10.5.64.128/31	10.5.64.128 – 10.5.64.129	10.5.64.129
66	10.5.64.130/31	10.5.64.130 – 10.5.64.131	10.5.64.131
67	10.5.64.132/31	10.5.64.132 – 10.5.64.133	10.5.64.133
68	10.5.64.134/31	10.5.64.134 – 10.5.64.135	10.5.64.135
69	10.5.64.136/31	10.5.64.136 – 10.5.64.137	10.5.64.137
70	10.5.64.138/31	10.5.64.138 – 10.5.64.139	10.5.64.139
71	10.5.64.140/31	10.5.64.140 – 10.5.64.141	10.5.64.141
72	10.5.64.142/31	10.5.64.142 – 10.5.64.143	10.5.64.143
73	10.5.64.144/31	10.5.64.144 – 10.5.64.145	10.5.64.145
74	10.5.64.146/31	10.5.64.146 – 10.5.64.147	10.5.64.147
75	10.5.64.148/31	10.5.64.148 – 10.5.64.149	10.5.64.149
76	10.5.64.150/31	10.5.64.150 – 10.5.64.151	10.5.64.151
77	10.5.64.152/31	10.5.64.152 – 10.5.64.153	10.5.64.153
78	10.5.64.154/31	10.5.64.154 – 10.5.64.155	10.5.64.155
79	10.5.64.156/31	10.5.64.156 – 10.5.64.157	10.5.64.157
80	10.5.64.158/31	10.5.64.158 – 10.5.64.159	10.5.64.159
81	10.5.64.160/31	10.5.64.160 – 10.5.64.161	10.5.64.161
82	10.5.64.162/31	10.5.64.162 – 10.5.64.163	10.5.64.163
83	10.5.64.164/31	10.5.64.164 – 10.5.64.165	10.5.64.165
84	10.5.64.166/31	10.5.64.166 – 10.5.64.167	10.5.64.167
85	10.5.64.168/31	10.5.64.168 – 10.5.64.169	10.5.64.169
86	10.5.64.170/31	10.5.64.170 – 10.5.64.171	10.5.64.171
87	10.5.64.172/31	10.5.64.172 – 10.5.64.173	10.5.64.173
88	10.5.64.174/31	10.5.64.174 – 10.5.64.175	10.5.64.175
89	10.5.64.176/31	10.5.64.176 – 10.5.64.177	10.5.64.177
90	10.5.64.178/31	10.5.64.178 – 10.5.64.179	10.5.64.179
91	10.5.64.180/31	10.5.64.180 – 10.5.64.181	10.5.64.181
92	10.5.64.182/31	10.5.64.182 – 10.5.64.183	10.5.64.183
93	10.5.64.184/31	10.5.64.184 – 10.5.64.185	10.5.64.185
94	10.5.64.186/31	10.5.64.186 – 10.5.64.187	10.5.64.187
95	10.5.64.188/31	10.5.64.188 – 10.5.64.189	10.5.64.189
96	10.5.64.190/31	10.5.64.190 – 10.5.64.191	10.5.64.191
97	10.5.64.192/31	10.5.64.192 – 10.5.64.193	10.5.64.193
98	10.5.64.194/31	10.5.64.194 – 10.5.64.195	10.5.64.195
99	10.5.64.196/31	10.5.64.196 – 10.5.64.197	10.5.64.197
100	10.5.64.198/31	10.5.64.198 – 10.5.64.199	10.5.64.199
101	10.5.64.200/31	10.5.64.200 – 10.5.64.201	10.5.64.201
102	10.5.64.202/31	10.5.64.202 – 10.5.64.203	10.5.64.203
103	10.5.64.204/31	10.5.64.204 – 10.5.64.205	10.5.64.205
104	10.5.64.206/31	10.5.64.206 – 10.5.64.207	10.5.64.207
105	10.5.64.208/31	10.5.64.208 – 10.5.64.209	10.5.64.209
106	10.5.64.210/31	10.5.64.210 – 10.5.64.211	10.5.64.211
107	10.5.64.212/31	10.5.64.212 – 10.5.64.213	10.5.64.213
108	10.5.64.214/31	10.5.64.214 – 10.5.64.215	10.5.64.215
109	10.5.64.216/31	10.5.64.216 – 10.5.64.217	10.5.64.217
110	10.5.64.218/31	10.5.64.218 – 10.5.64.219	10.5.64.219
111	10.5.64.220/31	10.5.64.220 – 10.5.64.221	10.5.64.221
112	10.5.64.222/31	10.5.64.222 – 10.5.64.223	10.5.64.223
113	10.5.64.224/31	10.5.64.224 – 10.5.64.225	10.5.64.225
114	10.5.64.226/31	10.5.64.226 – 10.5.64.227	10.5.64.227
115	10.5.64.228/31	10.5.64.228 – 10.5.64.229	10.5.64.229
116	10.5.64.230/31	10.5.64.230 – 10.5.64.231	10.5.64.231
117	10.5.64.232/31	10.5.64.232 – 10.5.64.233	10.5.64.233
118	10.5.64.234/31	10.5.64.234 – 10.5.64.235	10.5.64.235
119	10.5.64.236/31	10.5.64.236 – 10.5.64.237	10.5.64.237
120	10.5.64.238/31	10.5.64.238 – 10.5.64.239	10.5.64.239
121	10.5.64.240/31	10.5.64.240 – 10.5.64.241	10.5.64.241
122	10.5.64.242/31	10.5.64.242 – 10.5.64.243	10.5.64.243
123	10.5.64.244/31	10.5.64.244 – 10.5.64.245	10.5.64.245
124	10.5.64.246/31	10.5.64.246 – 10.5.64.247	10.5.64.247
125	10.5.64.248/31	10.5.64.248 – 10.5.64.249	10.5.64.249
126	10.5.64.250/31	10.5.64.250 – 10.5.64.251	10.5.64.251
127	10.5.64.252/31	10.5.64.252 – 10.5.64.253	10.5.64.253
128	10.5.64.254/31	10.5.64.254 – 10.5.64.255	10.5.64.255
129	10.5.65.0/31	10.5.65.0 – 10.5.65.1	10.5.65.1
130	10.5.65.2/31	10.5.65.2 – 10.5.65.3	10.5.65.3
131	10.5.65.4/31	10.5.65.4 – 10.5.65.5	10.5.65.5
132	10.5.65.6/31	10.5.65.6 – 10.5.65.7	10.5.65.7
133	10.5.65.8/31	10.5.65.8 – 10.5.65.9	10.5.65.9
134	10.5.65.10/31	10.5.65.10 – 10.5.65.11	10.5.65.11
135	10.5.65.12/31	10.5.65.12 – 10.5.65.13	10.5.65.13
136	10.5.65.14/31	10.5.65.14 – 10.5.65.15	10.5.65.15
137	10.5.65.16/31	10.5.65.16 – 10.5.65.17	10.5.65.17
138	10.5.65.18/31	10.5.65.18 – 10.5.65.19	10.5.65.19
139	10.5.65.20/31	10.5.65.20 – 10.5.65.21	10.5.65.21
140	10.5.65.22/31	10.5.65.22 – 10.5.65.23	10.5.65.23
141	10.5.65.24/31	10.5.65.24 – 10.5.65.25	10.5.65.25
142	10.5.65.26/31	10.5.65.26 – 10.5.65.27	10.5.65.27
143	10.5.65.28/31	10.5.65.28 – 10.5.65.29	10.5.65.29
144	10.5.65.30/31	10.5.65.30 – 10.5.65.31	10.5.65.31
145	10.5.65.32/31	10.5.65.32 – 10.5.65.33	10.5.65.33
146	10.5.65.34/31	10.5.65.34 – 10.5.65.35	10.5.65.35
147	10.5.65.36/31	10.5.65.36 – 10.5.65.37	10.5.65.37
148	10.5.65.38/31	10.5.65.38 – 10.5.65.39	10.5.65.39
149	10.5.65.40/31	10.5.65.40 – 10.5.65.41	10.5.65.41
150	10.5.65.42/31	10.5.65.42 – 10.5.65.43	10.5.65.43
151	10.5.65.44/31	10.5.65.44 – 10.5.65.45	10.5.65.45
152	10.5.65.46/31	10.5.65.46 – 10.5.65.47	10.5.65.47
153	10.5.65.48/31	10.5.65.48 – 10.5.65.49	10.5.65.49
154	10.5.65.50/31	10.5.65.50 – 10.5.65.51	10.5.65.51
155	10.5.65.52/31	10.5.65.52 – 10.5.65.53	10.5.65.53
156	10.5.65.54/31	10.5.65.54 – 10.5.65.55	10.5.65.55
157	10.5.65.56/31	10.5.65.56 – 10.5.65.57	10.5.65.57
158	10.5.65.58/31	10.5.65.58 – 10.5.65.59	10.5.65.59
159	10.5.65.60/31	10.5.65.60 – 10.5.65.61	10.5.65.61
160	10.5.65.62/31	10.5.65.62 – 10.5.65.63	10.5.65.63
161	10.5.65.64/31	10.5.65.64 – 10.5.65.65	10.5.65.65
162	10.5.65.66/31	10.5.65.66 – 10.5.65.67	10.5.65.67
163	10.5.65.68/31	10.5.65.68 – 10.5.65.69	10.5.65.69
164	10.5.65.70/31	10.5.65.70 – 10.5.65.71	10.5.65.71
165	10.5.65.72/31	10.5.65.72 – 10.5.65.73	10.5.65.73
166	10.5.65.74/31	10.5.65.74 – 10.5.65.75	10.5.65.75
167	10.5.65.76/31	10.5.65.76 – 10.5.65.77	10.5.65.77
168	10.5.65.78/31	10.5.65.78 – 10.5.65.79	10.5.65.79
169	10.5.65.80/31	10.5.65.80 – 10.5.65.81	10.5.65.81
170	10.5.65.82/31	10.5.65.82 – 10.5.65.83	10.5.65.83
171	10.5.65.84/31	10.5.65.84 – 10.5.65.85	10.5.65.85
172	10.5.65.86/31	10.5.65.86 – 10.5.65.87	10.5.65.87
173	10.5.65.88/31	10.5.65.88 – 10.5.65.89	10.5.65.89
174	10.5.65.90/31	10.5.65.90 – 10.5.65.91	10.5.65.91
175	10.5.65.92/31	10.5.65.92 – 10.5.65.93	10.5.65.93
176	10.5.65.94/31	10.5.65.94 – 10.5.65.95	10.5.65.95
177	10.5.65.96/31	10.5.65.96 – 10.5.65.97	10.5.65.97
178	10.5.65.98/31	10.5.65.98 – 10.5.65.99	10.5.65.99
179	10.5.65.100/31	10.5.65.100 – 10.5.65.101	10.5.65.101
180	10.5.65.102/31	10.5.65.102 – 10.5.65.103	10.5.65.103
181	10.5.65.104/31	10.5.65.104 – 10.5.65.105	10.5.65.105
182	10.5.65.106/31	10.5.65.106 – 10.5.65.107	10.5.65.107
183	10.5.65.108/31	10.5.65.108 – 10.5.65.109	10.5.65.109
184	10.5.65.110/31	10.5.65.110 – 10.5.65.111	10.5.65.111
185	10.5.65.112/31	10.5.65.112 – 10.5.65.113	10.5.65.113
186	10.5.65.114/31	10.5.65.114 – 10.5.65.115	10.5.65.115
187	10.5.65.116/31	10.5.65.116 – 10.5.65.117	10.5.65.117
188	10.5.65.118/31	10.5.65.118 – 10.5.65.119	10.5.65.119
189	10.5.65.120/31	10.5.65.120 – 10.5.65.121	10.5.65.121
190	10.5.65.122/31	10.5.65.122 – 10.5.65.123	10.5.65.123
191	10.5.65.124/31	10.5.65.124 – 10.5.65.125	10.5.65.125
192	10.5.65.126/31	10.5.65.126 – 10.5.65.127	10.5.65.127
193	10.5.65.128/31	10.5.65.128 – 10.5.65.129	10.5.65.129
194	10.5.65.130/31	10.5.65.130 – 10.5.65.131	10.5.65.131
195	10.5.65.132/31	10.5.65.132 – 10.5.65.133	10.5.65.133
196	10.5.65.134/31	10.5.65.134 – 10.5.65.135	10.5.65.135
197	10.5.65.136/31	10.5.65.136 – 10.5.65.137	10.5.65.137
198	10.5.65.138/31	10.5.65.138 – 10.5.65.139	10.5.65.139
199	10.5.65.140/31	10.5.65.140 – 10.5.65.141	10.5.65.141
200	10.5.65.142/31	10.5.65.142 – 10.5.65.143	10.5.65.143
201	10.5.65.144/31	10.5.65.144 – 10.5.65.145	10.5.65.145
202	10.5.65.146/31	10.5.65.146 – 10.5.65.147	10.5.65.147
203	10.5.65.148/31	10.5.65.148 – 10.5.65.149	10.5.65.149
204	10.5.65.150/31	10.5.65.150 – 10.5.65.151	10.5.65.151
205	10.5.65.152/31	10.5.65.152 – 10.5.65.153	10.5.65.153
206	10.5.65.154/31	10.5.65.154 – 10.5.65.155	10.5.65.155
207	10.5.65.156/31	10.5.65.156 – 10.5.65.157	10.5.65.157
208	10.5.65.158/31	10.5.65.158 – 10.5.65.159	10.5.65.159
209	10.5.65.160/31	10.5.65.160 – 10.5.65.161	10.5.65.161
210	10.5.65.162/31	10.5.65.162 – 10.5.65.163	10.5.65.163
211	10.5.65.164/31	10.5.65.164 – 10.5.65.165	10.5.65.165
212	10.5.65.166/31	10.5.65.166 – 10.5.65.167	10.5.65.167
213	10.5.65.168/31	10.5.65.168 – 10.5.65.169	10.5.65.169
214	10.5.65.170/31	10.5.65.170 – 10.5.65.171	10.5.65.171
215	10.5.65.172/31	10.5.65.172 – 10.5.65.173	10.5.65.173
216	10.5.65.174/31	10.5.65.174 – 10.5.65.175	10.5.65.175
217	10.5.65.176/31	10.5.65.176 – 10.5.65.177	10.5.65.177
218	10.5.65.178/31	10.5.65.178 – 10.5.65.179	10.5.65.179
219	10.5.65.180/31	10.5.65.180 – 10.5.65.181	10.5.65.181
220	10.5.65.182/31	10.5.65.182 – 10.5.65.183	10.5.65.183
221	10.5.65.184/31	10.5.65.184 – 10.5.65.185	10.5.65.185
222	10.5.65.186/31	10.5.65.186 – 10.5.65.187	10.5.65.187
223	10.5.65.188/31	10.5.65.188 – 10.5.65.189	10.5.65.189
224	10.5.65.190/31	10.5.65.190 – 10.5.65.191	10.5.65.191
225	10.5.65.192/31	10.5.65.192 – 10.5.65.193	10.5.65.193
226	10.5.65.194/31	10.5.65.194 – 10.5.65.195	10.5.65.195
227	10.5.65.196/31	10.5.65.196 – 10.5.65.197	10.5.65.197
228	10.5.65.198/31	10.5.65.198 – 10.5.65.199	10.5.65.199
229	10.5.65.200/31	10.5.65.200 – 10.5.65.201	10.5.65.201
230	10.5.65.202/31	10.5.65.202 – 10.5.65.203	10.5.65.203
231	10.5.65.204/31	10.5.65.204 – 10.5.65.205	10.5.65.205
232	10.5.65.206/31	10.5.65.206 – 10.5.65.207	10.5.65.207
233	10.5.65.208/31	10.5.65.208 – 10.5.65.209	10.5.65.209
234	10.5.65.210/31	10.5.65.210 – 10.5.65.211	10.5.65.211
235	10.5.65.212/31	10.5.65.212 – 10.5.65.213	10.5.65.213
236	10.5.65.214/31	10.5.65.214 – 10.5.65.215	10.5.65.215
237	10.5.65.216/31	10.5.65.216 – 10.5.65.217	10.5.65.217
238	10.5.65.218/31	10.5.65.218 – 10.5.65.219	10.5.65.219
239	10.5.65.220/31	10.5.65.220 – 10.5.65.221	10.5.65.221
240	10.5.65.222/31	10.5.65.222 – 10.5.65.223	10.5.65.223
241	10.5.65.224/31	10.5.65.224 – 10.5.65.225	10.5.65.225
242	10.5.65.226/31	10.5.65.226 – 10.5.65.227	10.5.65.227
243	10.5.65.228/31	10.5.65.228 – 10.5.65.229	10.5.65.229
244	10.5.65.230/31	10.5.65.230 – 10.5.65.231	10.5.65.231
245	10.5.65.232/31	10.5.65.232 – 10.5.65.233	10.5.65.233
246	10.5.65.234/31	10.5.65.234 – 10.5.65.235	10.5.65.235
247	10.5.65.236/31	10.5.65.236 – 10.5.65.237	10.5.65.237
248	10.5.65.238/31	10.5.65.238 – 10.5.65.239	10.5.65.239
249	10.5.65.240/31	10.5.65.240 – 10.5.65.241	10.5.65.241
250	10.5.65.242/31	10.5.65.242 – 10.5.65.243	10.5.65.243
251	10.5.65.244/31	10.5.65.244 – 10.5.65.245	10.5.65.245
252	10.5.65.246/31	10.5.65.246 – 10.5.65.247	10.5.65.247
253	10.5.65.248/31	10.5.65.248 – 10.5.65.249	10.5.65.249
254	10.5.65.250/31	10.5.65.250 – 10.5.65.251	10.5.65.251
255	10.5.65.252/31	10.5.65.252 – 10.5.65.253	10.5.65.253
256	10.5.65.254/31	10.5.65.254 – 10.5.65.255	10.5.65.255

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 →