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 /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.216.0/29	10.0.216.1 – 10.0.216.6	10.0.216.7
2	10.0.216.8/29	10.0.216.9 – 10.0.216.14	10.0.216.15
3	10.0.216.16/29	10.0.216.17 – 10.0.216.22	10.0.216.23
4	10.0.216.24/29	10.0.216.25 – 10.0.216.30	10.0.216.31
5	10.0.216.32/29	10.0.216.33 – 10.0.216.38	10.0.216.39
6	10.0.216.40/29	10.0.216.41 – 10.0.216.46	10.0.216.47
7	10.0.216.48/29	10.0.216.49 – 10.0.216.54	10.0.216.55
8	10.0.216.56/29	10.0.216.57 – 10.0.216.62	10.0.216.63
9	10.0.216.64/29	10.0.216.65 – 10.0.216.70	10.0.216.71
10	10.0.216.72/29	10.0.216.73 – 10.0.216.78	10.0.216.79
11	10.0.216.80/29	10.0.216.81 – 10.0.216.86	10.0.216.87
12	10.0.216.88/29	10.0.216.89 – 10.0.216.94	10.0.216.95
13	10.0.216.96/29	10.0.216.97 – 10.0.216.102	10.0.216.103
14	10.0.216.104/29	10.0.216.105 – 10.0.216.110	10.0.216.111
15	10.0.216.112/29	10.0.216.113 – 10.0.216.118	10.0.216.119
16	10.0.216.120/29	10.0.216.121 – 10.0.216.126	10.0.216.127
17	10.0.216.128/29	10.0.216.129 – 10.0.216.134	10.0.216.135
18	10.0.216.136/29	10.0.216.137 – 10.0.216.142	10.0.216.143
19	10.0.216.144/29	10.0.216.145 – 10.0.216.150	10.0.216.151
20	10.0.216.152/29	10.0.216.153 – 10.0.216.158	10.0.216.159
21	10.0.216.160/29	10.0.216.161 – 10.0.216.166	10.0.216.167
22	10.0.216.168/29	10.0.216.169 – 10.0.216.174	10.0.216.175
23	10.0.216.176/29	10.0.216.177 – 10.0.216.182	10.0.216.183
24	10.0.216.184/29	10.0.216.185 – 10.0.216.190	10.0.216.191
25	10.0.216.192/29	10.0.216.193 – 10.0.216.198	10.0.216.199
26	10.0.216.200/29	10.0.216.201 – 10.0.216.206	10.0.216.207
27	10.0.216.208/29	10.0.216.209 – 10.0.216.214	10.0.216.215
28	10.0.216.216/29	10.0.216.217 – 10.0.216.222	10.0.216.223
29	10.0.216.224/29	10.0.216.225 – 10.0.216.230	10.0.216.231
30	10.0.216.232/29	10.0.216.233 – 10.0.216.238	10.0.216.239
31	10.0.216.240/29	10.0.216.241 – 10.0.216.246	10.0.216.247
32	10.0.216.248/29	10.0.216.249 – 10.0.216.254	10.0.216.255
33	10.0.217.0/29	10.0.217.1 – 10.0.217.6	10.0.217.7
34	10.0.217.8/29	10.0.217.9 – 10.0.217.14	10.0.217.15
35	10.0.217.16/29	10.0.217.17 – 10.0.217.22	10.0.217.23
36	10.0.217.24/29	10.0.217.25 – 10.0.217.30	10.0.217.31
37	10.0.217.32/29	10.0.217.33 – 10.0.217.38	10.0.217.39
38	10.0.217.40/29	10.0.217.41 – 10.0.217.46	10.0.217.47
39	10.0.217.48/29	10.0.217.49 – 10.0.217.54	10.0.217.55
40	10.0.217.56/29	10.0.217.57 – 10.0.217.62	10.0.217.63
41	10.0.217.64/29	10.0.217.65 – 10.0.217.70	10.0.217.71
42	10.0.217.72/29	10.0.217.73 – 10.0.217.78	10.0.217.79
43	10.0.217.80/29	10.0.217.81 – 10.0.217.86	10.0.217.87
44	10.0.217.88/29	10.0.217.89 – 10.0.217.94	10.0.217.95
45	10.0.217.96/29	10.0.217.97 – 10.0.217.102	10.0.217.103
46	10.0.217.104/29	10.0.217.105 – 10.0.217.110	10.0.217.111
47	10.0.217.112/29	10.0.217.113 – 10.0.217.118	10.0.217.119
48	10.0.217.120/29	10.0.217.121 – 10.0.217.126	10.0.217.127
49	10.0.217.128/29	10.0.217.129 – 10.0.217.134	10.0.217.135
50	10.0.217.136/29	10.0.217.137 – 10.0.217.142	10.0.217.143
51	10.0.217.144/29	10.0.217.145 – 10.0.217.150	10.0.217.151
52	10.0.217.152/29	10.0.217.153 – 10.0.217.158	10.0.217.159
53	10.0.217.160/29	10.0.217.161 – 10.0.217.166	10.0.217.167
54	10.0.217.168/29	10.0.217.169 – 10.0.217.174	10.0.217.175
55	10.0.217.176/29	10.0.217.177 – 10.0.217.182	10.0.217.183
56	10.0.217.184/29	10.0.217.185 – 10.0.217.190	10.0.217.191
57	10.0.217.192/29	10.0.217.193 – 10.0.217.198	10.0.217.199
58	10.0.217.200/29	10.0.217.201 – 10.0.217.206	10.0.217.207
59	10.0.217.208/29	10.0.217.209 – 10.0.217.214	10.0.217.215
60	10.0.217.216/29	10.0.217.217 – 10.0.217.222	10.0.217.223
61	10.0.217.224/29	10.0.217.225 – 10.0.217.230	10.0.217.231
62	10.0.217.232/29	10.0.217.233 – 10.0.217.238	10.0.217.239
63	10.0.217.240/29	10.0.217.241 – 10.0.217.246	10.0.217.247
64	10.0.217.248/29	10.0.217.249 – 10.0.217.254	10.0.217.255
65	10.0.218.0/29	10.0.218.1 – 10.0.218.6	10.0.218.7
66	10.0.218.8/29	10.0.218.9 – 10.0.218.14	10.0.218.15
67	10.0.218.16/29	10.0.218.17 – 10.0.218.22	10.0.218.23
68	10.0.218.24/29	10.0.218.25 – 10.0.218.30	10.0.218.31
69	10.0.218.32/29	10.0.218.33 – 10.0.218.38	10.0.218.39
70	10.0.218.40/29	10.0.218.41 – 10.0.218.46	10.0.218.47
71	10.0.218.48/29	10.0.218.49 – 10.0.218.54	10.0.218.55
72	10.0.218.56/29	10.0.218.57 – 10.0.218.62	10.0.218.63
73	10.0.218.64/29	10.0.218.65 – 10.0.218.70	10.0.218.71
74	10.0.218.72/29	10.0.218.73 – 10.0.218.78	10.0.218.79
75	10.0.218.80/29	10.0.218.81 – 10.0.218.86	10.0.218.87
76	10.0.218.88/29	10.0.218.89 – 10.0.218.94	10.0.218.95
77	10.0.218.96/29	10.0.218.97 – 10.0.218.102	10.0.218.103
78	10.0.218.104/29	10.0.218.105 – 10.0.218.110	10.0.218.111
79	10.0.218.112/29	10.0.218.113 – 10.0.218.118	10.0.218.119
80	10.0.218.120/29	10.0.218.121 – 10.0.218.126	10.0.218.127
81	10.0.218.128/29	10.0.218.129 – 10.0.218.134	10.0.218.135
82	10.0.218.136/29	10.0.218.137 – 10.0.218.142	10.0.218.143
83	10.0.218.144/29	10.0.218.145 – 10.0.218.150	10.0.218.151
84	10.0.218.152/29	10.0.218.153 – 10.0.218.158	10.0.218.159
85	10.0.218.160/29	10.0.218.161 – 10.0.218.166	10.0.218.167
86	10.0.218.168/29	10.0.218.169 – 10.0.218.174	10.0.218.175
87	10.0.218.176/29	10.0.218.177 – 10.0.218.182	10.0.218.183
88	10.0.218.184/29	10.0.218.185 – 10.0.218.190	10.0.218.191
89	10.0.218.192/29	10.0.218.193 – 10.0.218.198	10.0.218.199
90	10.0.218.200/29	10.0.218.201 – 10.0.218.206	10.0.218.207
91	10.0.218.208/29	10.0.218.209 – 10.0.218.214	10.0.218.215
92	10.0.218.216/29	10.0.218.217 – 10.0.218.222	10.0.218.223
93	10.0.218.224/29	10.0.218.225 – 10.0.218.230	10.0.218.231
94	10.0.218.232/29	10.0.218.233 – 10.0.218.238	10.0.218.239
95	10.0.218.240/29	10.0.218.241 – 10.0.218.246	10.0.218.247
96	10.0.218.248/29	10.0.218.249 – 10.0.218.254	10.0.218.255
97	10.0.219.0/29	10.0.219.1 – 10.0.219.6	10.0.219.7
98	10.0.219.8/29	10.0.219.9 – 10.0.219.14	10.0.219.15
99	10.0.219.16/29	10.0.219.17 – 10.0.219.22	10.0.219.23
100	10.0.219.24/29	10.0.219.25 – 10.0.219.30	10.0.219.31
101	10.0.219.32/29	10.0.219.33 – 10.0.219.38	10.0.219.39
102	10.0.219.40/29	10.0.219.41 – 10.0.219.46	10.0.219.47
103	10.0.219.48/29	10.0.219.49 – 10.0.219.54	10.0.219.55
104	10.0.219.56/29	10.0.219.57 – 10.0.219.62	10.0.219.63
105	10.0.219.64/29	10.0.219.65 – 10.0.219.70	10.0.219.71
106	10.0.219.72/29	10.0.219.73 – 10.0.219.78	10.0.219.79
107	10.0.219.80/29	10.0.219.81 – 10.0.219.86	10.0.219.87
108	10.0.219.88/29	10.0.219.89 – 10.0.219.94	10.0.219.95
109	10.0.219.96/29	10.0.219.97 – 10.0.219.102	10.0.219.103
110	10.0.219.104/29	10.0.219.105 – 10.0.219.110	10.0.219.111
111	10.0.219.112/29	10.0.219.113 – 10.0.219.118	10.0.219.119
112	10.0.219.120/29	10.0.219.121 – 10.0.219.126	10.0.219.127
113	10.0.219.128/29	10.0.219.129 – 10.0.219.134	10.0.219.135
114	10.0.219.136/29	10.0.219.137 – 10.0.219.142	10.0.219.143
115	10.0.219.144/29	10.0.219.145 – 10.0.219.150	10.0.219.151
116	10.0.219.152/29	10.0.219.153 – 10.0.219.158	10.0.219.159
117	10.0.219.160/29	10.0.219.161 – 10.0.219.166	10.0.219.167
118	10.0.219.168/29	10.0.219.169 – 10.0.219.174	10.0.219.175
119	10.0.219.176/29	10.0.219.177 – 10.0.219.182	10.0.219.183
120	10.0.219.184/29	10.0.219.185 – 10.0.219.190	10.0.219.191
121	10.0.219.192/29	10.0.219.193 – 10.0.219.198	10.0.219.199
122	10.0.219.200/29	10.0.219.201 – 10.0.219.206	10.0.219.207
123	10.0.219.208/29	10.0.219.209 – 10.0.219.214	10.0.219.215
124	10.0.219.216/29	10.0.219.217 – 10.0.219.222	10.0.219.223
125	10.0.219.224/29	10.0.219.225 – 10.0.219.230	10.0.219.231
126	10.0.219.232/29	10.0.219.233 – 10.0.219.238	10.0.219.239
127	10.0.219.240/29	10.0.219.241 – 10.0.219.246	10.0.219.247
128	10.0.219.248/29	10.0.219.249 – 10.0.219.254	10.0.219.255
129	10.0.220.0/29	10.0.220.1 – 10.0.220.6	10.0.220.7
130	10.0.220.8/29	10.0.220.9 – 10.0.220.14	10.0.220.15
131	10.0.220.16/29	10.0.220.17 – 10.0.220.22	10.0.220.23
132	10.0.220.24/29	10.0.220.25 – 10.0.220.30	10.0.220.31
133	10.0.220.32/29	10.0.220.33 – 10.0.220.38	10.0.220.39
134	10.0.220.40/29	10.0.220.41 – 10.0.220.46	10.0.220.47
135	10.0.220.48/29	10.0.220.49 – 10.0.220.54	10.0.220.55
136	10.0.220.56/29	10.0.220.57 – 10.0.220.62	10.0.220.63
137	10.0.220.64/29	10.0.220.65 – 10.0.220.70	10.0.220.71
138	10.0.220.72/29	10.0.220.73 – 10.0.220.78	10.0.220.79
139	10.0.220.80/29	10.0.220.81 – 10.0.220.86	10.0.220.87
140	10.0.220.88/29	10.0.220.89 – 10.0.220.94	10.0.220.95
141	10.0.220.96/29	10.0.220.97 – 10.0.220.102	10.0.220.103
142	10.0.220.104/29	10.0.220.105 – 10.0.220.110	10.0.220.111
143	10.0.220.112/29	10.0.220.113 – 10.0.220.118	10.0.220.119
144	10.0.220.120/29	10.0.220.121 – 10.0.220.126	10.0.220.127
145	10.0.220.128/29	10.0.220.129 – 10.0.220.134	10.0.220.135
146	10.0.220.136/29	10.0.220.137 – 10.0.220.142	10.0.220.143
147	10.0.220.144/29	10.0.220.145 – 10.0.220.150	10.0.220.151
148	10.0.220.152/29	10.0.220.153 – 10.0.220.158	10.0.220.159
149	10.0.220.160/29	10.0.220.161 – 10.0.220.166	10.0.220.167
150	10.0.220.168/29	10.0.220.169 – 10.0.220.174	10.0.220.175
151	10.0.220.176/29	10.0.220.177 – 10.0.220.182	10.0.220.183
152	10.0.220.184/29	10.0.220.185 – 10.0.220.190	10.0.220.191
153	10.0.220.192/29	10.0.220.193 – 10.0.220.198	10.0.220.199
154	10.0.220.200/29	10.0.220.201 – 10.0.220.206	10.0.220.207
155	10.0.220.208/29	10.0.220.209 – 10.0.220.214	10.0.220.215
156	10.0.220.216/29	10.0.220.217 – 10.0.220.222	10.0.220.223
157	10.0.220.224/29	10.0.220.225 – 10.0.220.230	10.0.220.231
158	10.0.220.232/29	10.0.220.233 – 10.0.220.238	10.0.220.239
159	10.0.220.240/29	10.0.220.241 – 10.0.220.246	10.0.220.247
160	10.0.220.248/29	10.0.220.249 – 10.0.220.254	10.0.220.255
161	10.0.221.0/29	10.0.221.1 – 10.0.221.6	10.0.221.7
162	10.0.221.8/29	10.0.221.9 – 10.0.221.14	10.0.221.15
163	10.0.221.16/29	10.0.221.17 – 10.0.221.22	10.0.221.23
164	10.0.221.24/29	10.0.221.25 – 10.0.221.30	10.0.221.31
165	10.0.221.32/29	10.0.221.33 – 10.0.221.38	10.0.221.39
166	10.0.221.40/29	10.0.221.41 – 10.0.221.46	10.0.221.47
167	10.0.221.48/29	10.0.221.49 – 10.0.221.54	10.0.221.55
168	10.0.221.56/29	10.0.221.57 – 10.0.221.62	10.0.221.63
169	10.0.221.64/29	10.0.221.65 – 10.0.221.70	10.0.221.71
170	10.0.221.72/29	10.0.221.73 – 10.0.221.78	10.0.221.79
171	10.0.221.80/29	10.0.221.81 – 10.0.221.86	10.0.221.87
172	10.0.221.88/29	10.0.221.89 – 10.0.221.94	10.0.221.95
173	10.0.221.96/29	10.0.221.97 – 10.0.221.102	10.0.221.103
174	10.0.221.104/29	10.0.221.105 – 10.0.221.110	10.0.221.111
175	10.0.221.112/29	10.0.221.113 – 10.0.221.118	10.0.221.119
176	10.0.221.120/29	10.0.221.121 – 10.0.221.126	10.0.221.127
177	10.0.221.128/29	10.0.221.129 – 10.0.221.134	10.0.221.135
178	10.0.221.136/29	10.0.221.137 – 10.0.221.142	10.0.221.143
179	10.0.221.144/29	10.0.221.145 – 10.0.221.150	10.0.221.151
180	10.0.221.152/29	10.0.221.153 – 10.0.221.158	10.0.221.159
181	10.0.221.160/29	10.0.221.161 – 10.0.221.166	10.0.221.167
182	10.0.221.168/29	10.0.221.169 – 10.0.221.174	10.0.221.175
183	10.0.221.176/29	10.0.221.177 – 10.0.221.182	10.0.221.183
184	10.0.221.184/29	10.0.221.185 – 10.0.221.190	10.0.221.191
185	10.0.221.192/29	10.0.221.193 – 10.0.221.198	10.0.221.199
186	10.0.221.200/29	10.0.221.201 – 10.0.221.206	10.0.221.207
187	10.0.221.208/29	10.0.221.209 – 10.0.221.214	10.0.221.215
188	10.0.221.216/29	10.0.221.217 – 10.0.221.222	10.0.221.223
189	10.0.221.224/29	10.0.221.225 – 10.0.221.230	10.0.221.231
190	10.0.221.232/29	10.0.221.233 – 10.0.221.238	10.0.221.239
191	10.0.221.240/29	10.0.221.241 – 10.0.221.246	10.0.221.247
192	10.0.221.248/29	10.0.221.249 – 10.0.221.254	10.0.221.255
193	10.0.222.0/29	10.0.222.1 – 10.0.222.6	10.0.222.7
194	10.0.222.8/29	10.0.222.9 – 10.0.222.14	10.0.222.15
195	10.0.222.16/29	10.0.222.17 – 10.0.222.22	10.0.222.23
196	10.0.222.24/29	10.0.222.25 – 10.0.222.30	10.0.222.31
197	10.0.222.32/29	10.0.222.33 – 10.0.222.38	10.0.222.39
198	10.0.222.40/29	10.0.222.41 – 10.0.222.46	10.0.222.47
199	10.0.222.48/29	10.0.222.49 – 10.0.222.54	10.0.222.55
200	10.0.222.56/29	10.0.222.57 – 10.0.222.62	10.0.222.63
201	10.0.222.64/29	10.0.222.65 – 10.0.222.70	10.0.222.71
202	10.0.222.72/29	10.0.222.73 – 10.0.222.78	10.0.222.79
203	10.0.222.80/29	10.0.222.81 – 10.0.222.86	10.0.222.87
204	10.0.222.88/29	10.0.222.89 – 10.0.222.94	10.0.222.95
205	10.0.222.96/29	10.0.222.97 – 10.0.222.102	10.0.222.103
206	10.0.222.104/29	10.0.222.105 – 10.0.222.110	10.0.222.111
207	10.0.222.112/29	10.0.222.113 – 10.0.222.118	10.0.222.119
208	10.0.222.120/29	10.0.222.121 – 10.0.222.126	10.0.222.127
209	10.0.222.128/29	10.0.222.129 – 10.0.222.134	10.0.222.135
210	10.0.222.136/29	10.0.222.137 – 10.0.222.142	10.0.222.143
211	10.0.222.144/29	10.0.222.145 – 10.0.222.150	10.0.222.151
212	10.0.222.152/29	10.0.222.153 – 10.0.222.158	10.0.222.159
213	10.0.222.160/29	10.0.222.161 – 10.0.222.166	10.0.222.167
214	10.0.222.168/29	10.0.222.169 – 10.0.222.174	10.0.222.175
215	10.0.222.176/29	10.0.222.177 – 10.0.222.182	10.0.222.183
216	10.0.222.184/29	10.0.222.185 – 10.0.222.190	10.0.222.191
217	10.0.222.192/29	10.0.222.193 – 10.0.222.198	10.0.222.199
218	10.0.222.200/29	10.0.222.201 – 10.0.222.206	10.0.222.207
219	10.0.222.208/29	10.0.222.209 – 10.0.222.214	10.0.222.215
220	10.0.222.216/29	10.0.222.217 – 10.0.222.222	10.0.222.223
221	10.0.222.224/29	10.0.222.225 – 10.0.222.230	10.0.222.231
222	10.0.222.232/29	10.0.222.233 – 10.0.222.238	10.0.222.239
223	10.0.222.240/29	10.0.222.241 – 10.0.222.246	10.0.222.247
224	10.0.222.248/29	10.0.222.249 – 10.0.222.254	10.0.222.255
225	10.0.223.0/29	10.0.223.1 – 10.0.223.6	10.0.223.7
226	10.0.223.8/29	10.0.223.9 – 10.0.223.14	10.0.223.15
227	10.0.223.16/29	10.0.223.17 – 10.0.223.22	10.0.223.23
228	10.0.223.24/29	10.0.223.25 – 10.0.223.30	10.0.223.31
229	10.0.223.32/29	10.0.223.33 – 10.0.223.38	10.0.223.39
230	10.0.223.40/29	10.0.223.41 – 10.0.223.46	10.0.223.47
231	10.0.223.48/29	10.0.223.49 – 10.0.223.54	10.0.223.55
232	10.0.223.56/29	10.0.223.57 – 10.0.223.62	10.0.223.63
233	10.0.223.64/29	10.0.223.65 – 10.0.223.70	10.0.223.71
234	10.0.223.72/29	10.0.223.73 – 10.0.223.78	10.0.223.79
235	10.0.223.80/29	10.0.223.81 – 10.0.223.86	10.0.223.87
236	10.0.223.88/29	10.0.223.89 – 10.0.223.94	10.0.223.95
237	10.0.223.96/29	10.0.223.97 – 10.0.223.102	10.0.223.103
238	10.0.223.104/29	10.0.223.105 – 10.0.223.110	10.0.223.111
239	10.0.223.112/29	10.0.223.113 – 10.0.223.118	10.0.223.119
240	10.0.223.120/29	10.0.223.121 – 10.0.223.126	10.0.223.127
241	10.0.223.128/29	10.0.223.129 – 10.0.223.134	10.0.223.135
242	10.0.223.136/29	10.0.223.137 – 10.0.223.142	10.0.223.143
243	10.0.223.144/29	10.0.223.145 – 10.0.223.150	10.0.223.151
244	10.0.223.152/29	10.0.223.153 – 10.0.223.158	10.0.223.159
245	10.0.223.160/29	10.0.223.161 – 10.0.223.166	10.0.223.167
246	10.0.223.168/29	10.0.223.169 – 10.0.223.174	10.0.223.175
247	10.0.223.176/29	10.0.223.177 – 10.0.223.182	10.0.223.183
248	10.0.223.184/29	10.0.223.185 – 10.0.223.190	10.0.223.191
249	10.0.223.192/29	10.0.223.193 – 10.0.223.198	10.0.223.199
250	10.0.223.200/29	10.0.223.201 – 10.0.223.206	10.0.223.207
251	10.0.223.208/29	10.0.223.209 – 10.0.223.214	10.0.223.215
252	10.0.223.216/29	10.0.223.217 – 10.0.223.222	10.0.223.223
253	10.0.223.224/29	10.0.223.225 – 10.0.223.230	10.0.223.231
254	10.0.223.232/29	10.0.223.233 – 10.0.223.238	10.0.223.239
255	10.0.223.240/29	10.0.223.241 – 10.0.223.246	10.0.223.247
256	10.0.223.248/29	10.0.223.249 – 10.0.223.254	10.0.223.255

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 /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 →