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)10.0.208.0/21

network10.0.208.0/21

broadcast10.0.215.255

first host10.0.208.1

last host10.0.215.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.208.0/21

address00001010.00000000.11010000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.11010000.00000000

broadcast00001010.00000000.11010111.11111111

green = network part, grey = host part

hex0x0a00d000

decimal167825408

reverse dns0.208.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:d000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.0.208.0/30	10.0.208.1 – 10.0.208.2	10.0.208.3
2	10.0.208.4/30	10.0.208.5 – 10.0.208.6	10.0.208.7
3	10.0.208.8/30	10.0.208.9 – 10.0.208.10	10.0.208.11
4	10.0.208.12/30	10.0.208.13 – 10.0.208.14	10.0.208.15
5	10.0.208.16/30	10.0.208.17 – 10.0.208.18	10.0.208.19
6	10.0.208.20/30	10.0.208.21 – 10.0.208.22	10.0.208.23
7	10.0.208.24/30	10.0.208.25 – 10.0.208.26	10.0.208.27
8	10.0.208.28/30	10.0.208.29 – 10.0.208.30	10.0.208.31
9	10.0.208.32/30	10.0.208.33 – 10.0.208.34	10.0.208.35
10	10.0.208.36/30	10.0.208.37 – 10.0.208.38	10.0.208.39
11	10.0.208.40/30	10.0.208.41 – 10.0.208.42	10.0.208.43
12	10.0.208.44/30	10.0.208.45 – 10.0.208.46	10.0.208.47
13	10.0.208.48/30	10.0.208.49 – 10.0.208.50	10.0.208.51
14	10.0.208.52/30	10.0.208.53 – 10.0.208.54	10.0.208.55
15	10.0.208.56/30	10.0.208.57 – 10.0.208.58	10.0.208.59
16	10.0.208.60/30	10.0.208.61 – 10.0.208.62	10.0.208.63
17	10.0.208.64/30	10.0.208.65 – 10.0.208.66	10.0.208.67
18	10.0.208.68/30	10.0.208.69 – 10.0.208.70	10.0.208.71
19	10.0.208.72/30	10.0.208.73 – 10.0.208.74	10.0.208.75
20	10.0.208.76/30	10.0.208.77 – 10.0.208.78	10.0.208.79
21	10.0.208.80/30	10.0.208.81 – 10.0.208.82	10.0.208.83
22	10.0.208.84/30	10.0.208.85 – 10.0.208.86	10.0.208.87
23	10.0.208.88/30	10.0.208.89 – 10.0.208.90	10.0.208.91
24	10.0.208.92/30	10.0.208.93 – 10.0.208.94	10.0.208.95
25	10.0.208.96/30	10.0.208.97 – 10.0.208.98	10.0.208.99
26	10.0.208.100/30	10.0.208.101 – 10.0.208.102	10.0.208.103
27	10.0.208.104/30	10.0.208.105 – 10.0.208.106	10.0.208.107
28	10.0.208.108/30	10.0.208.109 – 10.0.208.110	10.0.208.111
29	10.0.208.112/30	10.0.208.113 – 10.0.208.114	10.0.208.115
30	10.0.208.116/30	10.0.208.117 – 10.0.208.118	10.0.208.119
31	10.0.208.120/30	10.0.208.121 – 10.0.208.122	10.0.208.123
32	10.0.208.124/30	10.0.208.125 – 10.0.208.126	10.0.208.127
33	10.0.208.128/30	10.0.208.129 – 10.0.208.130	10.0.208.131
34	10.0.208.132/30	10.0.208.133 – 10.0.208.134	10.0.208.135
35	10.0.208.136/30	10.0.208.137 – 10.0.208.138	10.0.208.139
36	10.0.208.140/30	10.0.208.141 – 10.0.208.142	10.0.208.143
37	10.0.208.144/30	10.0.208.145 – 10.0.208.146	10.0.208.147
38	10.0.208.148/30	10.0.208.149 – 10.0.208.150	10.0.208.151
39	10.0.208.152/30	10.0.208.153 – 10.0.208.154	10.0.208.155
40	10.0.208.156/30	10.0.208.157 – 10.0.208.158	10.0.208.159
41	10.0.208.160/30	10.0.208.161 – 10.0.208.162	10.0.208.163
42	10.0.208.164/30	10.0.208.165 – 10.0.208.166	10.0.208.167
43	10.0.208.168/30	10.0.208.169 – 10.0.208.170	10.0.208.171
44	10.0.208.172/30	10.0.208.173 – 10.0.208.174	10.0.208.175
45	10.0.208.176/30	10.0.208.177 – 10.0.208.178	10.0.208.179
46	10.0.208.180/30	10.0.208.181 – 10.0.208.182	10.0.208.183
47	10.0.208.184/30	10.0.208.185 – 10.0.208.186	10.0.208.187
48	10.0.208.188/30	10.0.208.189 – 10.0.208.190	10.0.208.191
49	10.0.208.192/30	10.0.208.193 – 10.0.208.194	10.0.208.195
50	10.0.208.196/30	10.0.208.197 – 10.0.208.198	10.0.208.199
51	10.0.208.200/30	10.0.208.201 – 10.0.208.202	10.0.208.203
52	10.0.208.204/30	10.0.208.205 – 10.0.208.206	10.0.208.207
53	10.0.208.208/30	10.0.208.209 – 10.0.208.210	10.0.208.211
54	10.0.208.212/30	10.0.208.213 – 10.0.208.214	10.0.208.215
55	10.0.208.216/30	10.0.208.217 – 10.0.208.218	10.0.208.219
56	10.0.208.220/30	10.0.208.221 – 10.0.208.222	10.0.208.223
57	10.0.208.224/30	10.0.208.225 – 10.0.208.226	10.0.208.227
58	10.0.208.228/30	10.0.208.229 – 10.0.208.230	10.0.208.231
59	10.0.208.232/30	10.0.208.233 – 10.0.208.234	10.0.208.235
60	10.0.208.236/30	10.0.208.237 – 10.0.208.238	10.0.208.239
61	10.0.208.240/30	10.0.208.241 – 10.0.208.242	10.0.208.243
62	10.0.208.244/30	10.0.208.245 – 10.0.208.246	10.0.208.247
63	10.0.208.248/30	10.0.208.249 – 10.0.208.250	10.0.208.251
64	10.0.208.252/30	10.0.208.253 – 10.0.208.254	10.0.208.255
65	10.0.209.0/30	10.0.209.1 – 10.0.209.2	10.0.209.3
66	10.0.209.4/30	10.0.209.5 – 10.0.209.6	10.0.209.7
67	10.0.209.8/30	10.0.209.9 – 10.0.209.10	10.0.209.11
68	10.0.209.12/30	10.0.209.13 – 10.0.209.14	10.0.209.15
69	10.0.209.16/30	10.0.209.17 – 10.0.209.18	10.0.209.19
70	10.0.209.20/30	10.0.209.21 – 10.0.209.22	10.0.209.23
71	10.0.209.24/30	10.0.209.25 – 10.0.209.26	10.0.209.27
72	10.0.209.28/30	10.0.209.29 – 10.0.209.30	10.0.209.31
73	10.0.209.32/30	10.0.209.33 – 10.0.209.34	10.0.209.35
74	10.0.209.36/30	10.0.209.37 – 10.0.209.38	10.0.209.39
75	10.0.209.40/30	10.0.209.41 – 10.0.209.42	10.0.209.43
76	10.0.209.44/30	10.0.209.45 – 10.0.209.46	10.0.209.47
77	10.0.209.48/30	10.0.209.49 – 10.0.209.50	10.0.209.51
78	10.0.209.52/30	10.0.209.53 – 10.0.209.54	10.0.209.55
79	10.0.209.56/30	10.0.209.57 – 10.0.209.58	10.0.209.59
80	10.0.209.60/30	10.0.209.61 – 10.0.209.62	10.0.209.63
81	10.0.209.64/30	10.0.209.65 – 10.0.209.66	10.0.209.67
82	10.0.209.68/30	10.0.209.69 – 10.0.209.70	10.0.209.71
83	10.0.209.72/30	10.0.209.73 – 10.0.209.74	10.0.209.75
84	10.0.209.76/30	10.0.209.77 – 10.0.209.78	10.0.209.79
85	10.0.209.80/30	10.0.209.81 – 10.0.209.82	10.0.209.83
86	10.0.209.84/30	10.0.209.85 – 10.0.209.86	10.0.209.87
87	10.0.209.88/30	10.0.209.89 – 10.0.209.90	10.0.209.91
88	10.0.209.92/30	10.0.209.93 – 10.0.209.94	10.0.209.95
89	10.0.209.96/30	10.0.209.97 – 10.0.209.98	10.0.209.99
90	10.0.209.100/30	10.0.209.101 – 10.0.209.102	10.0.209.103
91	10.0.209.104/30	10.0.209.105 – 10.0.209.106	10.0.209.107
92	10.0.209.108/30	10.0.209.109 – 10.0.209.110	10.0.209.111
93	10.0.209.112/30	10.0.209.113 – 10.0.209.114	10.0.209.115
94	10.0.209.116/30	10.0.209.117 – 10.0.209.118	10.0.209.119
95	10.0.209.120/30	10.0.209.121 – 10.0.209.122	10.0.209.123
96	10.0.209.124/30	10.0.209.125 – 10.0.209.126	10.0.209.127
97	10.0.209.128/30	10.0.209.129 – 10.0.209.130	10.0.209.131
98	10.0.209.132/30	10.0.209.133 – 10.0.209.134	10.0.209.135
99	10.0.209.136/30	10.0.209.137 – 10.0.209.138	10.0.209.139
100	10.0.209.140/30	10.0.209.141 – 10.0.209.142	10.0.209.143
101	10.0.209.144/30	10.0.209.145 – 10.0.209.146	10.0.209.147
102	10.0.209.148/30	10.0.209.149 – 10.0.209.150	10.0.209.151
103	10.0.209.152/30	10.0.209.153 – 10.0.209.154	10.0.209.155
104	10.0.209.156/30	10.0.209.157 – 10.0.209.158	10.0.209.159
105	10.0.209.160/30	10.0.209.161 – 10.0.209.162	10.0.209.163
106	10.0.209.164/30	10.0.209.165 – 10.0.209.166	10.0.209.167
107	10.0.209.168/30	10.0.209.169 – 10.0.209.170	10.0.209.171
108	10.0.209.172/30	10.0.209.173 – 10.0.209.174	10.0.209.175
109	10.0.209.176/30	10.0.209.177 – 10.0.209.178	10.0.209.179
110	10.0.209.180/30	10.0.209.181 – 10.0.209.182	10.0.209.183
111	10.0.209.184/30	10.0.209.185 – 10.0.209.186	10.0.209.187
112	10.0.209.188/30	10.0.209.189 – 10.0.209.190	10.0.209.191
113	10.0.209.192/30	10.0.209.193 – 10.0.209.194	10.0.209.195
114	10.0.209.196/30	10.0.209.197 – 10.0.209.198	10.0.209.199
115	10.0.209.200/30	10.0.209.201 – 10.0.209.202	10.0.209.203
116	10.0.209.204/30	10.0.209.205 – 10.0.209.206	10.0.209.207
117	10.0.209.208/30	10.0.209.209 – 10.0.209.210	10.0.209.211
118	10.0.209.212/30	10.0.209.213 – 10.0.209.214	10.0.209.215
119	10.0.209.216/30	10.0.209.217 – 10.0.209.218	10.0.209.219
120	10.0.209.220/30	10.0.209.221 – 10.0.209.222	10.0.209.223
121	10.0.209.224/30	10.0.209.225 – 10.0.209.226	10.0.209.227
122	10.0.209.228/30	10.0.209.229 – 10.0.209.230	10.0.209.231
123	10.0.209.232/30	10.0.209.233 – 10.0.209.234	10.0.209.235
124	10.0.209.236/30	10.0.209.237 – 10.0.209.238	10.0.209.239
125	10.0.209.240/30	10.0.209.241 – 10.0.209.242	10.0.209.243
126	10.0.209.244/30	10.0.209.245 – 10.0.209.246	10.0.209.247
127	10.0.209.248/30	10.0.209.249 – 10.0.209.250	10.0.209.251
128	10.0.209.252/30	10.0.209.253 – 10.0.209.254	10.0.209.255
129	10.0.210.0/30	10.0.210.1 – 10.0.210.2	10.0.210.3
130	10.0.210.4/30	10.0.210.5 – 10.0.210.6	10.0.210.7
131	10.0.210.8/30	10.0.210.9 – 10.0.210.10	10.0.210.11
132	10.0.210.12/30	10.0.210.13 – 10.0.210.14	10.0.210.15
133	10.0.210.16/30	10.0.210.17 – 10.0.210.18	10.0.210.19
134	10.0.210.20/30	10.0.210.21 – 10.0.210.22	10.0.210.23
135	10.0.210.24/30	10.0.210.25 – 10.0.210.26	10.0.210.27
136	10.0.210.28/30	10.0.210.29 – 10.0.210.30	10.0.210.31
137	10.0.210.32/30	10.0.210.33 – 10.0.210.34	10.0.210.35
138	10.0.210.36/30	10.0.210.37 – 10.0.210.38	10.0.210.39
139	10.0.210.40/30	10.0.210.41 – 10.0.210.42	10.0.210.43
140	10.0.210.44/30	10.0.210.45 – 10.0.210.46	10.0.210.47
141	10.0.210.48/30	10.0.210.49 – 10.0.210.50	10.0.210.51
142	10.0.210.52/30	10.0.210.53 – 10.0.210.54	10.0.210.55
143	10.0.210.56/30	10.0.210.57 – 10.0.210.58	10.0.210.59
144	10.0.210.60/30	10.0.210.61 – 10.0.210.62	10.0.210.63
145	10.0.210.64/30	10.0.210.65 – 10.0.210.66	10.0.210.67
146	10.0.210.68/30	10.0.210.69 – 10.0.210.70	10.0.210.71
147	10.0.210.72/30	10.0.210.73 – 10.0.210.74	10.0.210.75
148	10.0.210.76/30	10.0.210.77 – 10.0.210.78	10.0.210.79
149	10.0.210.80/30	10.0.210.81 – 10.0.210.82	10.0.210.83
150	10.0.210.84/30	10.0.210.85 – 10.0.210.86	10.0.210.87
151	10.0.210.88/30	10.0.210.89 – 10.0.210.90	10.0.210.91
152	10.0.210.92/30	10.0.210.93 – 10.0.210.94	10.0.210.95
153	10.0.210.96/30	10.0.210.97 – 10.0.210.98	10.0.210.99
154	10.0.210.100/30	10.0.210.101 – 10.0.210.102	10.0.210.103
155	10.0.210.104/30	10.0.210.105 – 10.0.210.106	10.0.210.107
156	10.0.210.108/30	10.0.210.109 – 10.0.210.110	10.0.210.111
157	10.0.210.112/30	10.0.210.113 – 10.0.210.114	10.0.210.115
158	10.0.210.116/30	10.0.210.117 – 10.0.210.118	10.0.210.119
159	10.0.210.120/30	10.0.210.121 – 10.0.210.122	10.0.210.123
160	10.0.210.124/30	10.0.210.125 – 10.0.210.126	10.0.210.127
161	10.0.210.128/30	10.0.210.129 – 10.0.210.130	10.0.210.131
162	10.0.210.132/30	10.0.210.133 – 10.0.210.134	10.0.210.135
163	10.0.210.136/30	10.0.210.137 – 10.0.210.138	10.0.210.139
164	10.0.210.140/30	10.0.210.141 – 10.0.210.142	10.0.210.143
165	10.0.210.144/30	10.0.210.145 – 10.0.210.146	10.0.210.147
166	10.0.210.148/30	10.0.210.149 – 10.0.210.150	10.0.210.151
167	10.0.210.152/30	10.0.210.153 – 10.0.210.154	10.0.210.155
168	10.0.210.156/30	10.0.210.157 – 10.0.210.158	10.0.210.159
169	10.0.210.160/30	10.0.210.161 – 10.0.210.162	10.0.210.163
170	10.0.210.164/30	10.0.210.165 – 10.0.210.166	10.0.210.167
171	10.0.210.168/30	10.0.210.169 – 10.0.210.170	10.0.210.171
172	10.0.210.172/30	10.0.210.173 – 10.0.210.174	10.0.210.175
173	10.0.210.176/30	10.0.210.177 – 10.0.210.178	10.0.210.179
174	10.0.210.180/30	10.0.210.181 – 10.0.210.182	10.0.210.183
175	10.0.210.184/30	10.0.210.185 – 10.0.210.186	10.0.210.187
176	10.0.210.188/30	10.0.210.189 – 10.0.210.190	10.0.210.191
177	10.0.210.192/30	10.0.210.193 – 10.0.210.194	10.0.210.195
178	10.0.210.196/30	10.0.210.197 – 10.0.210.198	10.0.210.199
179	10.0.210.200/30	10.0.210.201 – 10.0.210.202	10.0.210.203
180	10.0.210.204/30	10.0.210.205 – 10.0.210.206	10.0.210.207
181	10.0.210.208/30	10.0.210.209 – 10.0.210.210	10.0.210.211
182	10.0.210.212/30	10.0.210.213 – 10.0.210.214	10.0.210.215
183	10.0.210.216/30	10.0.210.217 – 10.0.210.218	10.0.210.219
184	10.0.210.220/30	10.0.210.221 – 10.0.210.222	10.0.210.223
185	10.0.210.224/30	10.0.210.225 – 10.0.210.226	10.0.210.227
186	10.0.210.228/30	10.0.210.229 – 10.0.210.230	10.0.210.231
187	10.0.210.232/30	10.0.210.233 – 10.0.210.234	10.0.210.235
188	10.0.210.236/30	10.0.210.237 – 10.0.210.238	10.0.210.239
189	10.0.210.240/30	10.0.210.241 – 10.0.210.242	10.0.210.243
190	10.0.210.244/30	10.0.210.245 – 10.0.210.246	10.0.210.247
191	10.0.210.248/30	10.0.210.249 – 10.0.210.250	10.0.210.251
192	10.0.210.252/30	10.0.210.253 – 10.0.210.254	10.0.210.255
193	10.0.211.0/30	10.0.211.1 – 10.0.211.2	10.0.211.3
194	10.0.211.4/30	10.0.211.5 – 10.0.211.6	10.0.211.7
195	10.0.211.8/30	10.0.211.9 – 10.0.211.10	10.0.211.11
196	10.0.211.12/30	10.0.211.13 – 10.0.211.14	10.0.211.15
197	10.0.211.16/30	10.0.211.17 – 10.0.211.18	10.0.211.19
198	10.0.211.20/30	10.0.211.21 – 10.0.211.22	10.0.211.23
199	10.0.211.24/30	10.0.211.25 – 10.0.211.26	10.0.211.27
200	10.0.211.28/30	10.0.211.29 – 10.0.211.30	10.0.211.31
201	10.0.211.32/30	10.0.211.33 – 10.0.211.34	10.0.211.35
202	10.0.211.36/30	10.0.211.37 – 10.0.211.38	10.0.211.39
203	10.0.211.40/30	10.0.211.41 – 10.0.211.42	10.0.211.43
204	10.0.211.44/30	10.0.211.45 – 10.0.211.46	10.0.211.47
205	10.0.211.48/30	10.0.211.49 – 10.0.211.50	10.0.211.51
206	10.0.211.52/30	10.0.211.53 – 10.0.211.54	10.0.211.55
207	10.0.211.56/30	10.0.211.57 – 10.0.211.58	10.0.211.59
208	10.0.211.60/30	10.0.211.61 – 10.0.211.62	10.0.211.63
209	10.0.211.64/30	10.0.211.65 – 10.0.211.66	10.0.211.67
210	10.0.211.68/30	10.0.211.69 – 10.0.211.70	10.0.211.71
211	10.0.211.72/30	10.0.211.73 – 10.0.211.74	10.0.211.75
212	10.0.211.76/30	10.0.211.77 – 10.0.211.78	10.0.211.79
213	10.0.211.80/30	10.0.211.81 – 10.0.211.82	10.0.211.83
214	10.0.211.84/30	10.0.211.85 – 10.0.211.86	10.0.211.87
215	10.0.211.88/30	10.0.211.89 – 10.0.211.90	10.0.211.91
216	10.0.211.92/30	10.0.211.93 – 10.0.211.94	10.0.211.95
217	10.0.211.96/30	10.0.211.97 – 10.0.211.98	10.0.211.99
218	10.0.211.100/30	10.0.211.101 – 10.0.211.102	10.0.211.103
219	10.0.211.104/30	10.0.211.105 – 10.0.211.106	10.0.211.107
220	10.0.211.108/30	10.0.211.109 – 10.0.211.110	10.0.211.111
221	10.0.211.112/30	10.0.211.113 – 10.0.211.114	10.0.211.115
222	10.0.211.116/30	10.0.211.117 – 10.0.211.118	10.0.211.119
223	10.0.211.120/30	10.0.211.121 – 10.0.211.122	10.0.211.123
224	10.0.211.124/30	10.0.211.125 – 10.0.211.126	10.0.211.127
225	10.0.211.128/30	10.0.211.129 – 10.0.211.130	10.0.211.131
226	10.0.211.132/30	10.0.211.133 – 10.0.211.134	10.0.211.135
227	10.0.211.136/30	10.0.211.137 – 10.0.211.138	10.0.211.139
228	10.0.211.140/30	10.0.211.141 – 10.0.211.142	10.0.211.143
229	10.0.211.144/30	10.0.211.145 – 10.0.211.146	10.0.211.147
230	10.0.211.148/30	10.0.211.149 – 10.0.211.150	10.0.211.151
231	10.0.211.152/30	10.0.211.153 – 10.0.211.154	10.0.211.155
232	10.0.211.156/30	10.0.211.157 – 10.0.211.158	10.0.211.159
233	10.0.211.160/30	10.0.211.161 – 10.0.211.162	10.0.211.163
234	10.0.211.164/30	10.0.211.165 – 10.0.211.166	10.0.211.167
235	10.0.211.168/30	10.0.211.169 – 10.0.211.170	10.0.211.171
236	10.0.211.172/30	10.0.211.173 – 10.0.211.174	10.0.211.175
237	10.0.211.176/30	10.0.211.177 – 10.0.211.178	10.0.211.179
238	10.0.211.180/30	10.0.211.181 – 10.0.211.182	10.0.211.183
239	10.0.211.184/30	10.0.211.185 – 10.0.211.186	10.0.211.187
240	10.0.211.188/30	10.0.211.189 – 10.0.211.190	10.0.211.191
241	10.0.211.192/30	10.0.211.193 – 10.0.211.194	10.0.211.195
242	10.0.211.196/30	10.0.211.197 – 10.0.211.198	10.0.211.199
243	10.0.211.200/30	10.0.211.201 – 10.0.211.202	10.0.211.203
244	10.0.211.204/30	10.0.211.205 – 10.0.211.206	10.0.211.207
245	10.0.211.208/30	10.0.211.209 – 10.0.211.210	10.0.211.211
246	10.0.211.212/30	10.0.211.213 – 10.0.211.214	10.0.211.215
247	10.0.211.216/30	10.0.211.217 – 10.0.211.218	10.0.211.219
248	10.0.211.220/30	10.0.211.221 – 10.0.211.222	10.0.211.223
249	10.0.211.224/30	10.0.211.225 – 10.0.211.226	10.0.211.227
250	10.0.211.228/30	10.0.211.229 – 10.0.211.230	10.0.211.231
251	10.0.211.232/30	10.0.211.233 – 10.0.211.234	10.0.211.235
252	10.0.211.236/30	10.0.211.237 – 10.0.211.238	10.0.211.239
253	10.0.211.240/30	10.0.211.241 – 10.0.211.242	10.0.211.243
254	10.0.211.244/30	10.0.211.245 – 10.0.211.246	10.0.211.247
255	10.0.211.248/30	10.0.211.249 – 10.0.211.250	10.0.211.251
256	10.0.211.252/30	10.0.211.253 – 10.0.211.254	10.0.211.255

showing 256 of 512

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 →