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)10.0.216.0/21

network10.0.216.0/21

broadcast10.0.223.255

first host10.0.216.1

last host10.0.223.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.216.0/21

address00001010.00000000.11011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.11011000.00000000

broadcast00001010.00000000.11011111.11111111

green = network part, grey = host part

hex0x0a00d800

decimal167827456

reverse dns0.216.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:d800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.0.216.0/30	10.0.216.1 – 10.0.216.2	10.0.216.3
2	10.0.216.4/30	10.0.216.5 – 10.0.216.6	10.0.216.7
3	10.0.216.8/30	10.0.216.9 – 10.0.216.10	10.0.216.11
4	10.0.216.12/30	10.0.216.13 – 10.0.216.14	10.0.216.15
5	10.0.216.16/30	10.0.216.17 – 10.0.216.18	10.0.216.19
6	10.0.216.20/30	10.0.216.21 – 10.0.216.22	10.0.216.23
7	10.0.216.24/30	10.0.216.25 – 10.0.216.26	10.0.216.27
8	10.0.216.28/30	10.0.216.29 – 10.0.216.30	10.0.216.31
9	10.0.216.32/30	10.0.216.33 – 10.0.216.34	10.0.216.35
10	10.0.216.36/30	10.0.216.37 – 10.0.216.38	10.0.216.39
11	10.0.216.40/30	10.0.216.41 – 10.0.216.42	10.0.216.43
12	10.0.216.44/30	10.0.216.45 – 10.0.216.46	10.0.216.47
13	10.0.216.48/30	10.0.216.49 – 10.0.216.50	10.0.216.51
14	10.0.216.52/30	10.0.216.53 – 10.0.216.54	10.0.216.55
15	10.0.216.56/30	10.0.216.57 – 10.0.216.58	10.0.216.59
16	10.0.216.60/30	10.0.216.61 – 10.0.216.62	10.0.216.63
17	10.0.216.64/30	10.0.216.65 – 10.0.216.66	10.0.216.67
18	10.0.216.68/30	10.0.216.69 – 10.0.216.70	10.0.216.71
19	10.0.216.72/30	10.0.216.73 – 10.0.216.74	10.0.216.75
20	10.0.216.76/30	10.0.216.77 – 10.0.216.78	10.0.216.79
21	10.0.216.80/30	10.0.216.81 – 10.0.216.82	10.0.216.83
22	10.0.216.84/30	10.0.216.85 – 10.0.216.86	10.0.216.87
23	10.0.216.88/30	10.0.216.89 – 10.0.216.90	10.0.216.91
24	10.0.216.92/30	10.0.216.93 – 10.0.216.94	10.0.216.95
25	10.0.216.96/30	10.0.216.97 – 10.0.216.98	10.0.216.99
26	10.0.216.100/30	10.0.216.101 – 10.0.216.102	10.0.216.103
27	10.0.216.104/30	10.0.216.105 – 10.0.216.106	10.0.216.107
28	10.0.216.108/30	10.0.216.109 – 10.0.216.110	10.0.216.111
29	10.0.216.112/30	10.0.216.113 – 10.0.216.114	10.0.216.115
30	10.0.216.116/30	10.0.216.117 – 10.0.216.118	10.0.216.119
31	10.0.216.120/30	10.0.216.121 – 10.0.216.122	10.0.216.123
32	10.0.216.124/30	10.0.216.125 – 10.0.216.126	10.0.216.127
33	10.0.216.128/30	10.0.216.129 – 10.0.216.130	10.0.216.131
34	10.0.216.132/30	10.0.216.133 – 10.0.216.134	10.0.216.135
35	10.0.216.136/30	10.0.216.137 – 10.0.216.138	10.0.216.139
36	10.0.216.140/30	10.0.216.141 – 10.0.216.142	10.0.216.143
37	10.0.216.144/30	10.0.216.145 – 10.0.216.146	10.0.216.147
38	10.0.216.148/30	10.0.216.149 – 10.0.216.150	10.0.216.151
39	10.0.216.152/30	10.0.216.153 – 10.0.216.154	10.0.216.155
40	10.0.216.156/30	10.0.216.157 – 10.0.216.158	10.0.216.159
41	10.0.216.160/30	10.0.216.161 – 10.0.216.162	10.0.216.163
42	10.0.216.164/30	10.0.216.165 – 10.0.216.166	10.0.216.167
43	10.0.216.168/30	10.0.216.169 – 10.0.216.170	10.0.216.171
44	10.0.216.172/30	10.0.216.173 – 10.0.216.174	10.0.216.175
45	10.0.216.176/30	10.0.216.177 – 10.0.216.178	10.0.216.179
46	10.0.216.180/30	10.0.216.181 – 10.0.216.182	10.0.216.183
47	10.0.216.184/30	10.0.216.185 – 10.0.216.186	10.0.216.187
48	10.0.216.188/30	10.0.216.189 – 10.0.216.190	10.0.216.191
49	10.0.216.192/30	10.0.216.193 – 10.0.216.194	10.0.216.195
50	10.0.216.196/30	10.0.216.197 – 10.0.216.198	10.0.216.199
51	10.0.216.200/30	10.0.216.201 – 10.0.216.202	10.0.216.203
52	10.0.216.204/30	10.0.216.205 – 10.0.216.206	10.0.216.207
53	10.0.216.208/30	10.0.216.209 – 10.0.216.210	10.0.216.211
54	10.0.216.212/30	10.0.216.213 – 10.0.216.214	10.0.216.215
55	10.0.216.216/30	10.0.216.217 – 10.0.216.218	10.0.216.219
56	10.0.216.220/30	10.0.216.221 – 10.0.216.222	10.0.216.223
57	10.0.216.224/30	10.0.216.225 – 10.0.216.226	10.0.216.227
58	10.0.216.228/30	10.0.216.229 – 10.0.216.230	10.0.216.231
59	10.0.216.232/30	10.0.216.233 – 10.0.216.234	10.0.216.235
60	10.0.216.236/30	10.0.216.237 – 10.0.216.238	10.0.216.239
61	10.0.216.240/30	10.0.216.241 – 10.0.216.242	10.0.216.243
62	10.0.216.244/30	10.0.216.245 – 10.0.216.246	10.0.216.247
63	10.0.216.248/30	10.0.216.249 – 10.0.216.250	10.0.216.251
64	10.0.216.252/30	10.0.216.253 – 10.0.216.254	10.0.216.255
65	10.0.217.0/30	10.0.217.1 – 10.0.217.2	10.0.217.3
66	10.0.217.4/30	10.0.217.5 – 10.0.217.6	10.0.217.7
67	10.0.217.8/30	10.0.217.9 – 10.0.217.10	10.0.217.11
68	10.0.217.12/30	10.0.217.13 – 10.0.217.14	10.0.217.15
69	10.0.217.16/30	10.0.217.17 – 10.0.217.18	10.0.217.19
70	10.0.217.20/30	10.0.217.21 – 10.0.217.22	10.0.217.23
71	10.0.217.24/30	10.0.217.25 – 10.0.217.26	10.0.217.27
72	10.0.217.28/30	10.0.217.29 – 10.0.217.30	10.0.217.31
73	10.0.217.32/30	10.0.217.33 – 10.0.217.34	10.0.217.35
74	10.0.217.36/30	10.0.217.37 – 10.0.217.38	10.0.217.39
75	10.0.217.40/30	10.0.217.41 – 10.0.217.42	10.0.217.43
76	10.0.217.44/30	10.0.217.45 – 10.0.217.46	10.0.217.47
77	10.0.217.48/30	10.0.217.49 – 10.0.217.50	10.0.217.51
78	10.0.217.52/30	10.0.217.53 – 10.0.217.54	10.0.217.55
79	10.0.217.56/30	10.0.217.57 – 10.0.217.58	10.0.217.59
80	10.0.217.60/30	10.0.217.61 – 10.0.217.62	10.0.217.63
81	10.0.217.64/30	10.0.217.65 – 10.0.217.66	10.0.217.67
82	10.0.217.68/30	10.0.217.69 – 10.0.217.70	10.0.217.71
83	10.0.217.72/30	10.0.217.73 – 10.0.217.74	10.0.217.75
84	10.0.217.76/30	10.0.217.77 – 10.0.217.78	10.0.217.79
85	10.0.217.80/30	10.0.217.81 – 10.0.217.82	10.0.217.83
86	10.0.217.84/30	10.0.217.85 – 10.0.217.86	10.0.217.87
87	10.0.217.88/30	10.0.217.89 – 10.0.217.90	10.0.217.91
88	10.0.217.92/30	10.0.217.93 – 10.0.217.94	10.0.217.95
89	10.0.217.96/30	10.0.217.97 – 10.0.217.98	10.0.217.99
90	10.0.217.100/30	10.0.217.101 – 10.0.217.102	10.0.217.103
91	10.0.217.104/30	10.0.217.105 – 10.0.217.106	10.0.217.107
92	10.0.217.108/30	10.0.217.109 – 10.0.217.110	10.0.217.111
93	10.0.217.112/30	10.0.217.113 – 10.0.217.114	10.0.217.115
94	10.0.217.116/30	10.0.217.117 – 10.0.217.118	10.0.217.119
95	10.0.217.120/30	10.0.217.121 – 10.0.217.122	10.0.217.123
96	10.0.217.124/30	10.0.217.125 – 10.0.217.126	10.0.217.127
97	10.0.217.128/30	10.0.217.129 – 10.0.217.130	10.0.217.131
98	10.0.217.132/30	10.0.217.133 – 10.0.217.134	10.0.217.135
99	10.0.217.136/30	10.0.217.137 – 10.0.217.138	10.0.217.139
100	10.0.217.140/30	10.0.217.141 – 10.0.217.142	10.0.217.143
101	10.0.217.144/30	10.0.217.145 – 10.0.217.146	10.0.217.147
102	10.0.217.148/30	10.0.217.149 – 10.0.217.150	10.0.217.151
103	10.0.217.152/30	10.0.217.153 – 10.0.217.154	10.0.217.155
104	10.0.217.156/30	10.0.217.157 – 10.0.217.158	10.0.217.159
105	10.0.217.160/30	10.0.217.161 – 10.0.217.162	10.0.217.163
106	10.0.217.164/30	10.0.217.165 – 10.0.217.166	10.0.217.167
107	10.0.217.168/30	10.0.217.169 – 10.0.217.170	10.0.217.171
108	10.0.217.172/30	10.0.217.173 – 10.0.217.174	10.0.217.175
109	10.0.217.176/30	10.0.217.177 – 10.0.217.178	10.0.217.179
110	10.0.217.180/30	10.0.217.181 – 10.0.217.182	10.0.217.183
111	10.0.217.184/30	10.0.217.185 – 10.0.217.186	10.0.217.187
112	10.0.217.188/30	10.0.217.189 – 10.0.217.190	10.0.217.191
113	10.0.217.192/30	10.0.217.193 – 10.0.217.194	10.0.217.195
114	10.0.217.196/30	10.0.217.197 – 10.0.217.198	10.0.217.199
115	10.0.217.200/30	10.0.217.201 – 10.0.217.202	10.0.217.203
116	10.0.217.204/30	10.0.217.205 – 10.0.217.206	10.0.217.207
117	10.0.217.208/30	10.0.217.209 – 10.0.217.210	10.0.217.211
118	10.0.217.212/30	10.0.217.213 – 10.0.217.214	10.0.217.215
119	10.0.217.216/30	10.0.217.217 – 10.0.217.218	10.0.217.219
120	10.0.217.220/30	10.0.217.221 – 10.0.217.222	10.0.217.223
121	10.0.217.224/30	10.0.217.225 – 10.0.217.226	10.0.217.227
122	10.0.217.228/30	10.0.217.229 – 10.0.217.230	10.0.217.231
123	10.0.217.232/30	10.0.217.233 – 10.0.217.234	10.0.217.235
124	10.0.217.236/30	10.0.217.237 – 10.0.217.238	10.0.217.239
125	10.0.217.240/30	10.0.217.241 – 10.0.217.242	10.0.217.243
126	10.0.217.244/30	10.0.217.245 – 10.0.217.246	10.0.217.247
127	10.0.217.248/30	10.0.217.249 – 10.0.217.250	10.0.217.251
128	10.0.217.252/30	10.0.217.253 – 10.0.217.254	10.0.217.255
129	10.0.218.0/30	10.0.218.1 – 10.0.218.2	10.0.218.3
130	10.0.218.4/30	10.0.218.5 – 10.0.218.6	10.0.218.7
131	10.0.218.8/30	10.0.218.9 – 10.0.218.10	10.0.218.11
132	10.0.218.12/30	10.0.218.13 – 10.0.218.14	10.0.218.15
133	10.0.218.16/30	10.0.218.17 – 10.0.218.18	10.0.218.19
134	10.0.218.20/30	10.0.218.21 – 10.0.218.22	10.0.218.23
135	10.0.218.24/30	10.0.218.25 – 10.0.218.26	10.0.218.27
136	10.0.218.28/30	10.0.218.29 – 10.0.218.30	10.0.218.31
137	10.0.218.32/30	10.0.218.33 – 10.0.218.34	10.0.218.35
138	10.0.218.36/30	10.0.218.37 – 10.0.218.38	10.0.218.39
139	10.0.218.40/30	10.0.218.41 – 10.0.218.42	10.0.218.43
140	10.0.218.44/30	10.0.218.45 – 10.0.218.46	10.0.218.47
141	10.0.218.48/30	10.0.218.49 – 10.0.218.50	10.0.218.51
142	10.0.218.52/30	10.0.218.53 – 10.0.218.54	10.0.218.55
143	10.0.218.56/30	10.0.218.57 – 10.0.218.58	10.0.218.59
144	10.0.218.60/30	10.0.218.61 – 10.0.218.62	10.0.218.63
145	10.0.218.64/30	10.0.218.65 – 10.0.218.66	10.0.218.67
146	10.0.218.68/30	10.0.218.69 – 10.0.218.70	10.0.218.71
147	10.0.218.72/30	10.0.218.73 – 10.0.218.74	10.0.218.75
148	10.0.218.76/30	10.0.218.77 – 10.0.218.78	10.0.218.79
149	10.0.218.80/30	10.0.218.81 – 10.0.218.82	10.0.218.83
150	10.0.218.84/30	10.0.218.85 – 10.0.218.86	10.0.218.87
151	10.0.218.88/30	10.0.218.89 – 10.0.218.90	10.0.218.91
152	10.0.218.92/30	10.0.218.93 – 10.0.218.94	10.0.218.95
153	10.0.218.96/30	10.0.218.97 – 10.0.218.98	10.0.218.99
154	10.0.218.100/30	10.0.218.101 – 10.0.218.102	10.0.218.103
155	10.0.218.104/30	10.0.218.105 – 10.0.218.106	10.0.218.107
156	10.0.218.108/30	10.0.218.109 – 10.0.218.110	10.0.218.111
157	10.0.218.112/30	10.0.218.113 – 10.0.218.114	10.0.218.115
158	10.0.218.116/30	10.0.218.117 – 10.0.218.118	10.0.218.119
159	10.0.218.120/30	10.0.218.121 – 10.0.218.122	10.0.218.123
160	10.0.218.124/30	10.0.218.125 – 10.0.218.126	10.0.218.127
161	10.0.218.128/30	10.0.218.129 – 10.0.218.130	10.0.218.131
162	10.0.218.132/30	10.0.218.133 – 10.0.218.134	10.0.218.135
163	10.0.218.136/30	10.0.218.137 – 10.0.218.138	10.0.218.139
164	10.0.218.140/30	10.0.218.141 – 10.0.218.142	10.0.218.143
165	10.0.218.144/30	10.0.218.145 – 10.0.218.146	10.0.218.147
166	10.0.218.148/30	10.0.218.149 – 10.0.218.150	10.0.218.151
167	10.0.218.152/30	10.0.218.153 – 10.0.218.154	10.0.218.155
168	10.0.218.156/30	10.0.218.157 – 10.0.218.158	10.0.218.159
169	10.0.218.160/30	10.0.218.161 – 10.0.218.162	10.0.218.163
170	10.0.218.164/30	10.0.218.165 – 10.0.218.166	10.0.218.167
171	10.0.218.168/30	10.0.218.169 – 10.0.218.170	10.0.218.171
172	10.0.218.172/30	10.0.218.173 – 10.0.218.174	10.0.218.175
173	10.0.218.176/30	10.0.218.177 – 10.0.218.178	10.0.218.179
174	10.0.218.180/30	10.0.218.181 – 10.0.218.182	10.0.218.183
175	10.0.218.184/30	10.0.218.185 – 10.0.218.186	10.0.218.187
176	10.0.218.188/30	10.0.218.189 – 10.0.218.190	10.0.218.191
177	10.0.218.192/30	10.0.218.193 – 10.0.218.194	10.0.218.195
178	10.0.218.196/30	10.0.218.197 – 10.0.218.198	10.0.218.199
179	10.0.218.200/30	10.0.218.201 – 10.0.218.202	10.0.218.203
180	10.0.218.204/30	10.0.218.205 – 10.0.218.206	10.0.218.207
181	10.0.218.208/30	10.0.218.209 – 10.0.218.210	10.0.218.211
182	10.0.218.212/30	10.0.218.213 – 10.0.218.214	10.0.218.215
183	10.0.218.216/30	10.0.218.217 – 10.0.218.218	10.0.218.219
184	10.0.218.220/30	10.0.218.221 – 10.0.218.222	10.0.218.223
185	10.0.218.224/30	10.0.218.225 – 10.0.218.226	10.0.218.227
186	10.0.218.228/30	10.0.218.229 – 10.0.218.230	10.0.218.231
187	10.0.218.232/30	10.0.218.233 – 10.0.218.234	10.0.218.235
188	10.0.218.236/30	10.0.218.237 – 10.0.218.238	10.0.218.239
189	10.0.218.240/30	10.0.218.241 – 10.0.218.242	10.0.218.243
190	10.0.218.244/30	10.0.218.245 – 10.0.218.246	10.0.218.247
191	10.0.218.248/30	10.0.218.249 – 10.0.218.250	10.0.218.251
192	10.0.218.252/30	10.0.218.253 – 10.0.218.254	10.0.218.255
193	10.0.219.0/30	10.0.219.1 – 10.0.219.2	10.0.219.3
194	10.0.219.4/30	10.0.219.5 – 10.0.219.6	10.0.219.7
195	10.0.219.8/30	10.0.219.9 – 10.0.219.10	10.0.219.11
196	10.0.219.12/30	10.0.219.13 – 10.0.219.14	10.0.219.15
197	10.0.219.16/30	10.0.219.17 – 10.0.219.18	10.0.219.19
198	10.0.219.20/30	10.0.219.21 – 10.0.219.22	10.0.219.23
199	10.0.219.24/30	10.0.219.25 – 10.0.219.26	10.0.219.27
200	10.0.219.28/30	10.0.219.29 – 10.0.219.30	10.0.219.31
201	10.0.219.32/30	10.0.219.33 – 10.0.219.34	10.0.219.35
202	10.0.219.36/30	10.0.219.37 – 10.0.219.38	10.0.219.39
203	10.0.219.40/30	10.0.219.41 – 10.0.219.42	10.0.219.43
204	10.0.219.44/30	10.0.219.45 – 10.0.219.46	10.0.219.47
205	10.0.219.48/30	10.0.219.49 – 10.0.219.50	10.0.219.51
206	10.0.219.52/30	10.0.219.53 – 10.0.219.54	10.0.219.55
207	10.0.219.56/30	10.0.219.57 – 10.0.219.58	10.0.219.59
208	10.0.219.60/30	10.0.219.61 – 10.0.219.62	10.0.219.63
209	10.0.219.64/30	10.0.219.65 – 10.0.219.66	10.0.219.67
210	10.0.219.68/30	10.0.219.69 – 10.0.219.70	10.0.219.71
211	10.0.219.72/30	10.0.219.73 – 10.0.219.74	10.0.219.75
212	10.0.219.76/30	10.0.219.77 – 10.0.219.78	10.0.219.79
213	10.0.219.80/30	10.0.219.81 – 10.0.219.82	10.0.219.83
214	10.0.219.84/30	10.0.219.85 – 10.0.219.86	10.0.219.87
215	10.0.219.88/30	10.0.219.89 – 10.0.219.90	10.0.219.91
216	10.0.219.92/30	10.0.219.93 – 10.0.219.94	10.0.219.95
217	10.0.219.96/30	10.0.219.97 – 10.0.219.98	10.0.219.99
218	10.0.219.100/30	10.0.219.101 – 10.0.219.102	10.0.219.103
219	10.0.219.104/30	10.0.219.105 – 10.0.219.106	10.0.219.107
220	10.0.219.108/30	10.0.219.109 – 10.0.219.110	10.0.219.111
221	10.0.219.112/30	10.0.219.113 – 10.0.219.114	10.0.219.115
222	10.0.219.116/30	10.0.219.117 – 10.0.219.118	10.0.219.119
223	10.0.219.120/30	10.0.219.121 – 10.0.219.122	10.0.219.123
224	10.0.219.124/30	10.0.219.125 – 10.0.219.126	10.0.219.127
225	10.0.219.128/30	10.0.219.129 – 10.0.219.130	10.0.219.131
226	10.0.219.132/30	10.0.219.133 – 10.0.219.134	10.0.219.135
227	10.0.219.136/30	10.0.219.137 – 10.0.219.138	10.0.219.139
228	10.0.219.140/30	10.0.219.141 – 10.0.219.142	10.0.219.143
229	10.0.219.144/30	10.0.219.145 – 10.0.219.146	10.0.219.147
230	10.0.219.148/30	10.0.219.149 – 10.0.219.150	10.0.219.151
231	10.0.219.152/30	10.0.219.153 – 10.0.219.154	10.0.219.155
232	10.0.219.156/30	10.0.219.157 – 10.0.219.158	10.0.219.159
233	10.0.219.160/30	10.0.219.161 – 10.0.219.162	10.0.219.163
234	10.0.219.164/30	10.0.219.165 – 10.0.219.166	10.0.219.167
235	10.0.219.168/30	10.0.219.169 – 10.0.219.170	10.0.219.171
236	10.0.219.172/30	10.0.219.173 – 10.0.219.174	10.0.219.175
237	10.0.219.176/30	10.0.219.177 – 10.0.219.178	10.0.219.179
238	10.0.219.180/30	10.0.219.181 – 10.0.219.182	10.0.219.183
239	10.0.219.184/30	10.0.219.185 – 10.0.219.186	10.0.219.187
240	10.0.219.188/30	10.0.219.189 – 10.0.219.190	10.0.219.191
241	10.0.219.192/30	10.0.219.193 – 10.0.219.194	10.0.219.195
242	10.0.219.196/30	10.0.219.197 – 10.0.219.198	10.0.219.199
243	10.0.219.200/30	10.0.219.201 – 10.0.219.202	10.0.219.203
244	10.0.219.204/30	10.0.219.205 – 10.0.219.206	10.0.219.207
245	10.0.219.208/30	10.0.219.209 – 10.0.219.210	10.0.219.211
246	10.0.219.212/30	10.0.219.213 – 10.0.219.214	10.0.219.215
247	10.0.219.216/30	10.0.219.217 – 10.0.219.218	10.0.219.219
248	10.0.219.220/30	10.0.219.221 – 10.0.219.222	10.0.219.223
249	10.0.219.224/30	10.0.219.225 – 10.0.219.226	10.0.219.227
250	10.0.219.228/30	10.0.219.229 – 10.0.219.230	10.0.219.231
251	10.0.219.232/30	10.0.219.233 – 10.0.219.234	10.0.219.235
252	10.0.219.236/30	10.0.219.237 – 10.0.219.238	10.0.219.239
253	10.0.219.240/30	10.0.219.241 – 10.0.219.242	10.0.219.243
254	10.0.219.244/30	10.0.219.245 – 10.0.219.246	10.0.219.247
255	10.0.219.248/30	10.0.219.249 – 10.0.219.250	10.0.219.251
256	10.0.219.252/30	10.0.219.253 – 10.0.219.254	10.0.219.255

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 →