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)10.3.208.0/20

network10.3.208.0/20

broadcast10.3.223.255

first host10.3.208.1

last host10.3.223.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.208.0/20

address00001010.00000011.11010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.11010000.00000000

broadcast00001010.00000011.11011111.11111111

green = network part, grey = host part

hex0x0a03d000

decimal168022016

reverse dns0.208.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:d000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.208.0/28	10.3.208.1 – 10.3.208.14	10.3.208.15
2	10.3.208.16/28	10.3.208.17 – 10.3.208.30	10.3.208.31
3	10.3.208.32/28	10.3.208.33 – 10.3.208.46	10.3.208.47
4	10.3.208.48/28	10.3.208.49 – 10.3.208.62	10.3.208.63
5	10.3.208.64/28	10.3.208.65 – 10.3.208.78	10.3.208.79
6	10.3.208.80/28	10.3.208.81 – 10.3.208.94	10.3.208.95
7	10.3.208.96/28	10.3.208.97 – 10.3.208.110	10.3.208.111
8	10.3.208.112/28	10.3.208.113 – 10.3.208.126	10.3.208.127
9	10.3.208.128/28	10.3.208.129 – 10.3.208.142	10.3.208.143
10	10.3.208.144/28	10.3.208.145 – 10.3.208.158	10.3.208.159
11	10.3.208.160/28	10.3.208.161 – 10.3.208.174	10.3.208.175
12	10.3.208.176/28	10.3.208.177 – 10.3.208.190	10.3.208.191
13	10.3.208.192/28	10.3.208.193 – 10.3.208.206	10.3.208.207
14	10.3.208.208/28	10.3.208.209 – 10.3.208.222	10.3.208.223
15	10.3.208.224/28	10.3.208.225 – 10.3.208.238	10.3.208.239
16	10.3.208.240/28	10.3.208.241 – 10.3.208.254	10.3.208.255
17	10.3.209.0/28	10.3.209.1 – 10.3.209.14	10.3.209.15
18	10.3.209.16/28	10.3.209.17 – 10.3.209.30	10.3.209.31
19	10.3.209.32/28	10.3.209.33 – 10.3.209.46	10.3.209.47
20	10.3.209.48/28	10.3.209.49 – 10.3.209.62	10.3.209.63
21	10.3.209.64/28	10.3.209.65 – 10.3.209.78	10.3.209.79
22	10.3.209.80/28	10.3.209.81 – 10.3.209.94	10.3.209.95
23	10.3.209.96/28	10.3.209.97 – 10.3.209.110	10.3.209.111
24	10.3.209.112/28	10.3.209.113 – 10.3.209.126	10.3.209.127
25	10.3.209.128/28	10.3.209.129 – 10.3.209.142	10.3.209.143
26	10.3.209.144/28	10.3.209.145 – 10.3.209.158	10.3.209.159
27	10.3.209.160/28	10.3.209.161 – 10.3.209.174	10.3.209.175
28	10.3.209.176/28	10.3.209.177 – 10.3.209.190	10.3.209.191
29	10.3.209.192/28	10.3.209.193 – 10.3.209.206	10.3.209.207
30	10.3.209.208/28	10.3.209.209 – 10.3.209.222	10.3.209.223
31	10.3.209.224/28	10.3.209.225 – 10.3.209.238	10.3.209.239
32	10.3.209.240/28	10.3.209.241 – 10.3.209.254	10.3.209.255
33	10.3.210.0/28	10.3.210.1 – 10.3.210.14	10.3.210.15
34	10.3.210.16/28	10.3.210.17 – 10.3.210.30	10.3.210.31
35	10.3.210.32/28	10.3.210.33 – 10.3.210.46	10.3.210.47
36	10.3.210.48/28	10.3.210.49 – 10.3.210.62	10.3.210.63
37	10.3.210.64/28	10.3.210.65 – 10.3.210.78	10.3.210.79
38	10.3.210.80/28	10.3.210.81 – 10.3.210.94	10.3.210.95
39	10.3.210.96/28	10.3.210.97 – 10.3.210.110	10.3.210.111
40	10.3.210.112/28	10.3.210.113 – 10.3.210.126	10.3.210.127
41	10.3.210.128/28	10.3.210.129 – 10.3.210.142	10.3.210.143
42	10.3.210.144/28	10.3.210.145 – 10.3.210.158	10.3.210.159
43	10.3.210.160/28	10.3.210.161 – 10.3.210.174	10.3.210.175
44	10.3.210.176/28	10.3.210.177 – 10.3.210.190	10.3.210.191
45	10.3.210.192/28	10.3.210.193 – 10.3.210.206	10.3.210.207
46	10.3.210.208/28	10.3.210.209 – 10.3.210.222	10.3.210.223
47	10.3.210.224/28	10.3.210.225 – 10.3.210.238	10.3.210.239
48	10.3.210.240/28	10.3.210.241 – 10.3.210.254	10.3.210.255
49	10.3.211.0/28	10.3.211.1 – 10.3.211.14	10.3.211.15
50	10.3.211.16/28	10.3.211.17 – 10.3.211.30	10.3.211.31
51	10.3.211.32/28	10.3.211.33 – 10.3.211.46	10.3.211.47
52	10.3.211.48/28	10.3.211.49 – 10.3.211.62	10.3.211.63
53	10.3.211.64/28	10.3.211.65 – 10.3.211.78	10.3.211.79
54	10.3.211.80/28	10.3.211.81 – 10.3.211.94	10.3.211.95
55	10.3.211.96/28	10.3.211.97 – 10.3.211.110	10.3.211.111
56	10.3.211.112/28	10.3.211.113 – 10.3.211.126	10.3.211.127
57	10.3.211.128/28	10.3.211.129 – 10.3.211.142	10.3.211.143
58	10.3.211.144/28	10.3.211.145 – 10.3.211.158	10.3.211.159
59	10.3.211.160/28	10.3.211.161 – 10.3.211.174	10.3.211.175
60	10.3.211.176/28	10.3.211.177 – 10.3.211.190	10.3.211.191
61	10.3.211.192/28	10.3.211.193 – 10.3.211.206	10.3.211.207
62	10.3.211.208/28	10.3.211.209 – 10.3.211.222	10.3.211.223
63	10.3.211.224/28	10.3.211.225 – 10.3.211.238	10.3.211.239
64	10.3.211.240/28	10.3.211.241 – 10.3.211.254	10.3.211.255
65	10.3.212.0/28	10.3.212.1 – 10.3.212.14	10.3.212.15
66	10.3.212.16/28	10.3.212.17 – 10.3.212.30	10.3.212.31
67	10.3.212.32/28	10.3.212.33 – 10.3.212.46	10.3.212.47
68	10.3.212.48/28	10.3.212.49 – 10.3.212.62	10.3.212.63
69	10.3.212.64/28	10.3.212.65 – 10.3.212.78	10.3.212.79
70	10.3.212.80/28	10.3.212.81 – 10.3.212.94	10.3.212.95
71	10.3.212.96/28	10.3.212.97 – 10.3.212.110	10.3.212.111
72	10.3.212.112/28	10.3.212.113 – 10.3.212.126	10.3.212.127
73	10.3.212.128/28	10.3.212.129 – 10.3.212.142	10.3.212.143
74	10.3.212.144/28	10.3.212.145 – 10.3.212.158	10.3.212.159
75	10.3.212.160/28	10.3.212.161 – 10.3.212.174	10.3.212.175
76	10.3.212.176/28	10.3.212.177 – 10.3.212.190	10.3.212.191
77	10.3.212.192/28	10.3.212.193 – 10.3.212.206	10.3.212.207
78	10.3.212.208/28	10.3.212.209 – 10.3.212.222	10.3.212.223
79	10.3.212.224/28	10.3.212.225 – 10.3.212.238	10.3.212.239
80	10.3.212.240/28	10.3.212.241 – 10.3.212.254	10.3.212.255
81	10.3.213.0/28	10.3.213.1 – 10.3.213.14	10.3.213.15
82	10.3.213.16/28	10.3.213.17 – 10.3.213.30	10.3.213.31
83	10.3.213.32/28	10.3.213.33 – 10.3.213.46	10.3.213.47
84	10.3.213.48/28	10.3.213.49 – 10.3.213.62	10.3.213.63
85	10.3.213.64/28	10.3.213.65 – 10.3.213.78	10.3.213.79
86	10.3.213.80/28	10.3.213.81 – 10.3.213.94	10.3.213.95
87	10.3.213.96/28	10.3.213.97 – 10.3.213.110	10.3.213.111
88	10.3.213.112/28	10.3.213.113 – 10.3.213.126	10.3.213.127
89	10.3.213.128/28	10.3.213.129 – 10.3.213.142	10.3.213.143
90	10.3.213.144/28	10.3.213.145 – 10.3.213.158	10.3.213.159
91	10.3.213.160/28	10.3.213.161 – 10.3.213.174	10.3.213.175
92	10.3.213.176/28	10.3.213.177 – 10.3.213.190	10.3.213.191
93	10.3.213.192/28	10.3.213.193 – 10.3.213.206	10.3.213.207
94	10.3.213.208/28	10.3.213.209 – 10.3.213.222	10.3.213.223
95	10.3.213.224/28	10.3.213.225 – 10.3.213.238	10.3.213.239
96	10.3.213.240/28	10.3.213.241 – 10.3.213.254	10.3.213.255
97	10.3.214.0/28	10.3.214.1 – 10.3.214.14	10.3.214.15
98	10.3.214.16/28	10.3.214.17 – 10.3.214.30	10.3.214.31
99	10.3.214.32/28	10.3.214.33 – 10.3.214.46	10.3.214.47
100	10.3.214.48/28	10.3.214.49 – 10.3.214.62	10.3.214.63
101	10.3.214.64/28	10.3.214.65 – 10.3.214.78	10.3.214.79
102	10.3.214.80/28	10.3.214.81 – 10.3.214.94	10.3.214.95
103	10.3.214.96/28	10.3.214.97 – 10.3.214.110	10.3.214.111
104	10.3.214.112/28	10.3.214.113 – 10.3.214.126	10.3.214.127
105	10.3.214.128/28	10.3.214.129 – 10.3.214.142	10.3.214.143
106	10.3.214.144/28	10.3.214.145 – 10.3.214.158	10.3.214.159
107	10.3.214.160/28	10.3.214.161 – 10.3.214.174	10.3.214.175
108	10.3.214.176/28	10.3.214.177 – 10.3.214.190	10.3.214.191
109	10.3.214.192/28	10.3.214.193 – 10.3.214.206	10.3.214.207
110	10.3.214.208/28	10.3.214.209 – 10.3.214.222	10.3.214.223
111	10.3.214.224/28	10.3.214.225 – 10.3.214.238	10.3.214.239
112	10.3.214.240/28	10.3.214.241 – 10.3.214.254	10.3.214.255
113	10.3.215.0/28	10.3.215.1 – 10.3.215.14	10.3.215.15
114	10.3.215.16/28	10.3.215.17 – 10.3.215.30	10.3.215.31
115	10.3.215.32/28	10.3.215.33 – 10.3.215.46	10.3.215.47
116	10.3.215.48/28	10.3.215.49 – 10.3.215.62	10.3.215.63
117	10.3.215.64/28	10.3.215.65 – 10.3.215.78	10.3.215.79
118	10.3.215.80/28	10.3.215.81 – 10.3.215.94	10.3.215.95
119	10.3.215.96/28	10.3.215.97 – 10.3.215.110	10.3.215.111
120	10.3.215.112/28	10.3.215.113 – 10.3.215.126	10.3.215.127
121	10.3.215.128/28	10.3.215.129 – 10.3.215.142	10.3.215.143
122	10.3.215.144/28	10.3.215.145 – 10.3.215.158	10.3.215.159
123	10.3.215.160/28	10.3.215.161 – 10.3.215.174	10.3.215.175
124	10.3.215.176/28	10.3.215.177 – 10.3.215.190	10.3.215.191
125	10.3.215.192/28	10.3.215.193 – 10.3.215.206	10.3.215.207
126	10.3.215.208/28	10.3.215.209 – 10.3.215.222	10.3.215.223
127	10.3.215.224/28	10.3.215.225 – 10.3.215.238	10.3.215.239
128	10.3.215.240/28	10.3.215.241 – 10.3.215.254	10.3.215.255
129	10.3.216.0/28	10.3.216.1 – 10.3.216.14	10.3.216.15
130	10.3.216.16/28	10.3.216.17 – 10.3.216.30	10.3.216.31
131	10.3.216.32/28	10.3.216.33 – 10.3.216.46	10.3.216.47
132	10.3.216.48/28	10.3.216.49 – 10.3.216.62	10.3.216.63
133	10.3.216.64/28	10.3.216.65 – 10.3.216.78	10.3.216.79
134	10.3.216.80/28	10.3.216.81 – 10.3.216.94	10.3.216.95
135	10.3.216.96/28	10.3.216.97 – 10.3.216.110	10.3.216.111
136	10.3.216.112/28	10.3.216.113 – 10.3.216.126	10.3.216.127
137	10.3.216.128/28	10.3.216.129 – 10.3.216.142	10.3.216.143
138	10.3.216.144/28	10.3.216.145 – 10.3.216.158	10.3.216.159
139	10.3.216.160/28	10.3.216.161 – 10.3.216.174	10.3.216.175
140	10.3.216.176/28	10.3.216.177 – 10.3.216.190	10.3.216.191
141	10.3.216.192/28	10.3.216.193 – 10.3.216.206	10.3.216.207
142	10.3.216.208/28	10.3.216.209 – 10.3.216.222	10.3.216.223
143	10.3.216.224/28	10.3.216.225 – 10.3.216.238	10.3.216.239
144	10.3.216.240/28	10.3.216.241 – 10.3.216.254	10.3.216.255
145	10.3.217.0/28	10.3.217.1 – 10.3.217.14	10.3.217.15
146	10.3.217.16/28	10.3.217.17 – 10.3.217.30	10.3.217.31
147	10.3.217.32/28	10.3.217.33 – 10.3.217.46	10.3.217.47
148	10.3.217.48/28	10.3.217.49 – 10.3.217.62	10.3.217.63
149	10.3.217.64/28	10.3.217.65 – 10.3.217.78	10.3.217.79
150	10.3.217.80/28	10.3.217.81 – 10.3.217.94	10.3.217.95
151	10.3.217.96/28	10.3.217.97 – 10.3.217.110	10.3.217.111
152	10.3.217.112/28	10.3.217.113 – 10.3.217.126	10.3.217.127
153	10.3.217.128/28	10.3.217.129 – 10.3.217.142	10.3.217.143
154	10.3.217.144/28	10.3.217.145 – 10.3.217.158	10.3.217.159
155	10.3.217.160/28	10.3.217.161 – 10.3.217.174	10.3.217.175
156	10.3.217.176/28	10.3.217.177 – 10.3.217.190	10.3.217.191
157	10.3.217.192/28	10.3.217.193 – 10.3.217.206	10.3.217.207
158	10.3.217.208/28	10.3.217.209 – 10.3.217.222	10.3.217.223
159	10.3.217.224/28	10.3.217.225 – 10.3.217.238	10.3.217.239
160	10.3.217.240/28	10.3.217.241 – 10.3.217.254	10.3.217.255
161	10.3.218.0/28	10.3.218.1 – 10.3.218.14	10.3.218.15
162	10.3.218.16/28	10.3.218.17 – 10.3.218.30	10.3.218.31
163	10.3.218.32/28	10.3.218.33 – 10.3.218.46	10.3.218.47
164	10.3.218.48/28	10.3.218.49 – 10.3.218.62	10.3.218.63
165	10.3.218.64/28	10.3.218.65 – 10.3.218.78	10.3.218.79
166	10.3.218.80/28	10.3.218.81 – 10.3.218.94	10.3.218.95
167	10.3.218.96/28	10.3.218.97 – 10.3.218.110	10.3.218.111
168	10.3.218.112/28	10.3.218.113 – 10.3.218.126	10.3.218.127
169	10.3.218.128/28	10.3.218.129 – 10.3.218.142	10.3.218.143
170	10.3.218.144/28	10.3.218.145 – 10.3.218.158	10.3.218.159
171	10.3.218.160/28	10.3.218.161 – 10.3.218.174	10.3.218.175
172	10.3.218.176/28	10.3.218.177 – 10.3.218.190	10.3.218.191
173	10.3.218.192/28	10.3.218.193 – 10.3.218.206	10.3.218.207
174	10.3.218.208/28	10.3.218.209 – 10.3.218.222	10.3.218.223
175	10.3.218.224/28	10.3.218.225 – 10.3.218.238	10.3.218.239
176	10.3.218.240/28	10.3.218.241 – 10.3.218.254	10.3.218.255
177	10.3.219.0/28	10.3.219.1 – 10.3.219.14	10.3.219.15
178	10.3.219.16/28	10.3.219.17 – 10.3.219.30	10.3.219.31
179	10.3.219.32/28	10.3.219.33 – 10.3.219.46	10.3.219.47
180	10.3.219.48/28	10.3.219.49 – 10.3.219.62	10.3.219.63
181	10.3.219.64/28	10.3.219.65 – 10.3.219.78	10.3.219.79
182	10.3.219.80/28	10.3.219.81 – 10.3.219.94	10.3.219.95
183	10.3.219.96/28	10.3.219.97 – 10.3.219.110	10.3.219.111
184	10.3.219.112/28	10.3.219.113 – 10.3.219.126	10.3.219.127
185	10.3.219.128/28	10.3.219.129 – 10.3.219.142	10.3.219.143
186	10.3.219.144/28	10.3.219.145 – 10.3.219.158	10.3.219.159
187	10.3.219.160/28	10.3.219.161 – 10.3.219.174	10.3.219.175
188	10.3.219.176/28	10.3.219.177 – 10.3.219.190	10.3.219.191
189	10.3.219.192/28	10.3.219.193 – 10.3.219.206	10.3.219.207
190	10.3.219.208/28	10.3.219.209 – 10.3.219.222	10.3.219.223
191	10.3.219.224/28	10.3.219.225 – 10.3.219.238	10.3.219.239
192	10.3.219.240/28	10.3.219.241 – 10.3.219.254	10.3.219.255
193	10.3.220.0/28	10.3.220.1 – 10.3.220.14	10.3.220.15
194	10.3.220.16/28	10.3.220.17 – 10.3.220.30	10.3.220.31
195	10.3.220.32/28	10.3.220.33 – 10.3.220.46	10.3.220.47
196	10.3.220.48/28	10.3.220.49 – 10.3.220.62	10.3.220.63
197	10.3.220.64/28	10.3.220.65 – 10.3.220.78	10.3.220.79
198	10.3.220.80/28	10.3.220.81 – 10.3.220.94	10.3.220.95
199	10.3.220.96/28	10.3.220.97 – 10.3.220.110	10.3.220.111
200	10.3.220.112/28	10.3.220.113 – 10.3.220.126	10.3.220.127
201	10.3.220.128/28	10.3.220.129 – 10.3.220.142	10.3.220.143
202	10.3.220.144/28	10.3.220.145 – 10.3.220.158	10.3.220.159
203	10.3.220.160/28	10.3.220.161 – 10.3.220.174	10.3.220.175
204	10.3.220.176/28	10.3.220.177 – 10.3.220.190	10.3.220.191
205	10.3.220.192/28	10.3.220.193 – 10.3.220.206	10.3.220.207
206	10.3.220.208/28	10.3.220.209 – 10.3.220.222	10.3.220.223
207	10.3.220.224/28	10.3.220.225 – 10.3.220.238	10.3.220.239
208	10.3.220.240/28	10.3.220.241 – 10.3.220.254	10.3.220.255
209	10.3.221.0/28	10.3.221.1 – 10.3.221.14	10.3.221.15
210	10.3.221.16/28	10.3.221.17 – 10.3.221.30	10.3.221.31
211	10.3.221.32/28	10.3.221.33 – 10.3.221.46	10.3.221.47
212	10.3.221.48/28	10.3.221.49 – 10.3.221.62	10.3.221.63
213	10.3.221.64/28	10.3.221.65 – 10.3.221.78	10.3.221.79
214	10.3.221.80/28	10.3.221.81 – 10.3.221.94	10.3.221.95
215	10.3.221.96/28	10.3.221.97 – 10.3.221.110	10.3.221.111
216	10.3.221.112/28	10.3.221.113 – 10.3.221.126	10.3.221.127
217	10.3.221.128/28	10.3.221.129 – 10.3.221.142	10.3.221.143
218	10.3.221.144/28	10.3.221.145 – 10.3.221.158	10.3.221.159
219	10.3.221.160/28	10.3.221.161 – 10.3.221.174	10.3.221.175
220	10.3.221.176/28	10.3.221.177 – 10.3.221.190	10.3.221.191
221	10.3.221.192/28	10.3.221.193 – 10.3.221.206	10.3.221.207
222	10.3.221.208/28	10.3.221.209 – 10.3.221.222	10.3.221.223
223	10.3.221.224/28	10.3.221.225 – 10.3.221.238	10.3.221.239
224	10.3.221.240/28	10.3.221.241 – 10.3.221.254	10.3.221.255
225	10.3.222.0/28	10.3.222.1 – 10.3.222.14	10.3.222.15
226	10.3.222.16/28	10.3.222.17 – 10.3.222.30	10.3.222.31
227	10.3.222.32/28	10.3.222.33 – 10.3.222.46	10.3.222.47
228	10.3.222.48/28	10.3.222.49 – 10.3.222.62	10.3.222.63
229	10.3.222.64/28	10.3.222.65 – 10.3.222.78	10.3.222.79
230	10.3.222.80/28	10.3.222.81 – 10.3.222.94	10.3.222.95
231	10.3.222.96/28	10.3.222.97 – 10.3.222.110	10.3.222.111
232	10.3.222.112/28	10.3.222.113 – 10.3.222.126	10.3.222.127
233	10.3.222.128/28	10.3.222.129 – 10.3.222.142	10.3.222.143
234	10.3.222.144/28	10.3.222.145 – 10.3.222.158	10.3.222.159
235	10.3.222.160/28	10.3.222.161 – 10.3.222.174	10.3.222.175
236	10.3.222.176/28	10.3.222.177 – 10.3.222.190	10.3.222.191
237	10.3.222.192/28	10.3.222.193 – 10.3.222.206	10.3.222.207
238	10.3.222.208/28	10.3.222.209 – 10.3.222.222	10.3.222.223
239	10.3.222.224/28	10.3.222.225 – 10.3.222.238	10.3.222.239
240	10.3.222.240/28	10.3.222.241 – 10.3.222.254	10.3.222.255
241	10.3.223.0/28	10.3.223.1 – 10.3.223.14	10.3.223.15
242	10.3.223.16/28	10.3.223.17 – 10.3.223.30	10.3.223.31
243	10.3.223.32/28	10.3.223.33 – 10.3.223.46	10.3.223.47
244	10.3.223.48/28	10.3.223.49 – 10.3.223.62	10.3.223.63
245	10.3.223.64/28	10.3.223.65 – 10.3.223.78	10.3.223.79
246	10.3.223.80/28	10.3.223.81 – 10.3.223.94	10.3.223.95
247	10.3.223.96/28	10.3.223.97 – 10.3.223.110	10.3.223.111
248	10.3.223.112/28	10.3.223.113 – 10.3.223.126	10.3.223.127
249	10.3.223.128/28	10.3.223.129 – 10.3.223.142	10.3.223.143
250	10.3.223.144/28	10.3.223.145 – 10.3.223.158	10.3.223.159
251	10.3.223.160/28	10.3.223.161 – 10.3.223.174	10.3.223.175
252	10.3.223.176/28	10.3.223.177 – 10.3.223.190	10.3.223.191
253	10.3.223.192/28	10.3.223.193 – 10.3.223.206	10.3.223.207
254	10.3.223.208/28	10.3.223.209 – 10.3.223.222	10.3.223.223
255	10.3.223.224/28	10.3.223.225 – 10.3.223.238	10.3.223.239
256	10.3.223.240/28	10.3.223.241 – 10.3.223.254	10.3.223.255

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