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)10.5.208.0/20

network10.5.208.0/20

broadcast10.5.223.255

first host10.5.208.1

last host10.5.223.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.5.208.0/20

address00001010.00000101.11010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000101.11010000.00000000

broadcast00001010.00000101.11011111.11111111

green = network part, grey = host part

hex0x0a05d000

decimal168153088

reverse dns0.208.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:d000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.5.208.0/28	10.5.208.1 – 10.5.208.14	10.5.208.15
2	10.5.208.16/28	10.5.208.17 – 10.5.208.30	10.5.208.31
3	10.5.208.32/28	10.5.208.33 – 10.5.208.46	10.5.208.47
4	10.5.208.48/28	10.5.208.49 – 10.5.208.62	10.5.208.63
5	10.5.208.64/28	10.5.208.65 – 10.5.208.78	10.5.208.79
6	10.5.208.80/28	10.5.208.81 – 10.5.208.94	10.5.208.95
7	10.5.208.96/28	10.5.208.97 – 10.5.208.110	10.5.208.111
8	10.5.208.112/28	10.5.208.113 – 10.5.208.126	10.5.208.127
9	10.5.208.128/28	10.5.208.129 – 10.5.208.142	10.5.208.143
10	10.5.208.144/28	10.5.208.145 – 10.5.208.158	10.5.208.159
11	10.5.208.160/28	10.5.208.161 – 10.5.208.174	10.5.208.175
12	10.5.208.176/28	10.5.208.177 – 10.5.208.190	10.5.208.191
13	10.5.208.192/28	10.5.208.193 – 10.5.208.206	10.5.208.207
14	10.5.208.208/28	10.5.208.209 – 10.5.208.222	10.5.208.223
15	10.5.208.224/28	10.5.208.225 – 10.5.208.238	10.5.208.239
16	10.5.208.240/28	10.5.208.241 – 10.5.208.254	10.5.208.255
17	10.5.209.0/28	10.5.209.1 – 10.5.209.14	10.5.209.15
18	10.5.209.16/28	10.5.209.17 – 10.5.209.30	10.5.209.31
19	10.5.209.32/28	10.5.209.33 – 10.5.209.46	10.5.209.47
20	10.5.209.48/28	10.5.209.49 – 10.5.209.62	10.5.209.63
21	10.5.209.64/28	10.5.209.65 – 10.5.209.78	10.5.209.79
22	10.5.209.80/28	10.5.209.81 – 10.5.209.94	10.5.209.95
23	10.5.209.96/28	10.5.209.97 – 10.5.209.110	10.5.209.111
24	10.5.209.112/28	10.5.209.113 – 10.5.209.126	10.5.209.127
25	10.5.209.128/28	10.5.209.129 – 10.5.209.142	10.5.209.143
26	10.5.209.144/28	10.5.209.145 – 10.5.209.158	10.5.209.159
27	10.5.209.160/28	10.5.209.161 – 10.5.209.174	10.5.209.175
28	10.5.209.176/28	10.5.209.177 – 10.5.209.190	10.5.209.191
29	10.5.209.192/28	10.5.209.193 – 10.5.209.206	10.5.209.207
30	10.5.209.208/28	10.5.209.209 – 10.5.209.222	10.5.209.223
31	10.5.209.224/28	10.5.209.225 – 10.5.209.238	10.5.209.239
32	10.5.209.240/28	10.5.209.241 – 10.5.209.254	10.5.209.255
33	10.5.210.0/28	10.5.210.1 – 10.5.210.14	10.5.210.15
34	10.5.210.16/28	10.5.210.17 – 10.5.210.30	10.5.210.31
35	10.5.210.32/28	10.5.210.33 – 10.5.210.46	10.5.210.47
36	10.5.210.48/28	10.5.210.49 – 10.5.210.62	10.5.210.63
37	10.5.210.64/28	10.5.210.65 – 10.5.210.78	10.5.210.79
38	10.5.210.80/28	10.5.210.81 – 10.5.210.94	10.5.210.95
39	10.5.210.96/28	10.5.210.97 – 10.5.210.110	10.5.210.111
40	10.5.210.112/28	10.5.210.113 – 10.5.210.126	10.5.210.127
41	10.5.210.128/28	10.5.210.129 – 10.5.210.142	10.5.210.143
42	10.5.210.144/28	10.5.210.145 – 10.5.210.158	10.5.210.159
43	10.5.210.160/28	10.5.210.161 – 10.5.210.174	10.5.210.175
44	10.5.210.176/28	10.5.210.177 – 10.5.210.190	10.5.210.191
45	10.5.210.192/28	10.5.210.193 – 10.5.210.206	10.5.210.207
46	10.5.210.208/28	10.5.210.209 – 10.5.210.222	10.5.210.223
47	10.5.210.224/28	10.5.210.225 – 10.5.210.238	10.5.210.239
48	10.5.210.240/28	10.5.210.241 – 10.5.210.254	10.5.210.255
49	10.5.211.0/28	10.5.211.1 – 10.5.211.14	10.5.211.15
50	10.5.211.16/28	10.5.211.17 – 10.5.211.30	10.5.211.31
51	10.5.211.32/28	10.5.211.33 – 10.5.211.46	10.5.211.47
52	10.5.211.48/28	10.5.211.49 – 10.5.211.62	10.5.211.63
53	10.5.211.64/28	10.5.211.65 – 10.5.211.78	10.5.211.79
54	10.5.211.80/28	10.5.211.81 – 10.5.211.94	10.5.211.95
55	10.5.211.96/28	10.5.211.97 – 10.5.211.110	10.5.211.111
56	10.5.211.112/28	10.5.211.113 – 10.5.211.126	10.5.211.127
57	10.5.211.128/28	10.5.211.129 – 10.5.211.142	10.5.211.143
58	10.5.211.144/28	10.5.211.145 – 10.5.211.158	10.5.211.159
59	10.5.211.160/28	10.5.211.161 – 10.5.211.174	10.5.211.175
60	10.5.211.176/28	10.5.211.177 – 10.5.211.190	10.5.211.191
61	10.5.211.192/28	10.5.211.193 – 10.5.211.206	10.5.211.207
62	10.5.211.208/28	10.5.211.209 – 10.5.211.222	10.5.211.223
63	10.5.211.224/28	10.5.211.225 – 10.5.211.238	10.5.211.239
64	10.5.211.240/28	10.5.211.241 – 10.5.211.254	10.5.211.255
65	10.5.212.0/28	10.5.212.1 – 10.5.212.14	10.5.212.15
66	10.5.212.16/28	10.5.212.17 – 10.5.212.30	10.5.212.31
67	10.5.212.32/28	10.5.212.33 – 10.5.212.46	10.5.212.47
68	10.5.212.48/28	10.5.212.49 – 10.5.212.62	10.5.212.63
69	10.5.212.64/28	10.5.212.65 – 10.5.212.78	10.5.212.79
70	10.5.212.80/28	10.5.212.81 – 10.5.212.94	10.5.212.95
71	10.5.212.96/28	10.5.212.97 – 10.5.212.110	10.5.212.111
72	10.5.212.112/28	10.5.212.113 – 10.5.212.126	10.5.212.127
73	10.5.212.128/28	10.5.212.129 – 10.5.212.142	10.5.212.143
74	10.5.212.144/28	10.5.212.145 – 10.5.212.158	10.5.212.159
75	10.5.212.160/28	10.5.212.161 – 10.5.212.174	10.5.212.175
76	10.5.212.176/28	10.5.212.177 – 10.5.212.190	10.5.212.191
77	10.5.212.192/28	10.5.212.193 – 10.5.212.206	10.5.212.207
78	10.5.212.208/28	10.5.212.209 – 10.5.212.222	10.5.212.223
79	10.5.212.224/28	10.5.212.225 – 10.5.212.238	10.5.212.239
80	10.5.212.240/28	10.5.212.241 – 10.5.212.254	10.5.212.255
81	10.5.213.0/28	10.5.213.1 – 10.5.213.14	10.5.213.15
82	10.5.213.16/28	10.5.213.17 – 10.5.213.30	10.5.213.31
83	10.5.213.32/28	10.5.213.33 – 10.5.213.46	10.5.213.47
84	10.5.213.48/28	10.5.213.49 – 10.5.213.62	10.5.213.63
85	10.5.213.64/28	10.5.213.65 – 10.5.213.78	10.5.213.79
86	10.5.213.80/28	10.5.213.81 – 10.5.213.94	10.5.213.95
87	10.5.213.96/28	10.5.213.97 – 10.5.213.110	10.5.213.111
88	10.5.213.112/28	10.5.213.113 – 10.5.213.126	10.5.213.127
89	10.5.213.128/28	10.5.213.129 – 10.5.213.142	10.5.213.143
90	10.5.213.144/28	10.5.213.145 – 10.5.213.158	10.5.213.159
91	10.5.213.160/28	10.5.213.161 – 10.5.213.174	10.5.213.175
92	10.5.213.176/28	10.5.213.177 – 10.5.213.190	10.5.213.191
93	10.5.213.192/28	10.5.213.193 – 10.5.213.206	10.5.213.207
94	10.5.213.208/28	10.5.213.209 – 10.5.213.222	10.5.213.223
95	10.5.213.224/28	10.5.213.225 – 10.5.213.238	10.5.213.239
96	10.5.213.240/28	10.5.213.241 – 10.5.213.254	10.5.213.255
97	10.5.214.0/28	10.5.214.1 – 10.5.214.14	10.5.214.15
98	10.5.214.16/28	10.5.214.17 – 10.5.214.30	10.5.214.31
99	10.5.214.32/28	10.5.214.33 – 10.5.214.46	10.5.214.47
100	10.5.214.48/28	10.5.214.49 – 10.5.214.62	10.5.214.63
101	10.5.214.64/28	10.5.214.65 – 10.5.214.78	10.5.214.79
102	10.5.214.80/28	10.5.214.81 – 10.5.214.94	10.5.214.95
103	10.5.214.96/28	10.5.214.97 – 10.5.214.110	10.5.214.111
104	10.5.214.112/28	10.5.214.113 – 10.5.214.126	10.5.214.127
105	10.5.214.128/28	10.5.214.129 – 10.5.214.142	10.5.214.143
106	10.5.214.144/28	10.5.214.145 – 10.5.214.158	10.5.214.159
107	10.5.214.160/28	10.5.214.161 – 10.5.214.174	10.5.214.175
108	10.5.214.176/28	10.5.214.177 – 10.5.214.190	10.5.214.191
109	10.5.214.192/28	10.5.214.193 – 10.5.214.206	10.5.214.207
110	10.5.214.208/28	10.5.214.209 – 10.5.214.222	10.5.214.223
111	10.5.214.224/28	10.5.214.225 – 10.5.214.238	10.5.214.239
112	10.5.214.240/28	10.5.214.241 – 10.5.214.254	10.5.214.255
113	10.5.215.0/28	10.5.215.1 – 10.5.215.14	10.5.215.15
114	10.5.215.16/28	10.5.215.17 – 10.5.215.30	10.5.215.31
115	10.5.215.32/28	10.5.215.33 – 10.5.215.46	10.5.215.47
116	10.5.215.48/28	10.5.215.49 – 10.5.215.62	10.5.215.63
117	10.5.215.64/28	10.5.215.65 – 10.5.215.78	10.5.215.79
118	10.5.215.80/28	10.5.215.81 – 10.5.215.94	10.5.215.95
119	10.5.215.96/28	10.5.215.97 – 10.5.215.110	10.5.215.111
120	10.5.215.112/28	10.5.215.113 – 10.5.215.126	10.5.215.127
121	10.5.215.128/28	10.5.215.129 – 10.5.215.142	10.5.215.143
122	10.5.215.144/28	10.5.215.145 – 10.5.215.158	10.5.215.159
123	10.5.215.160/28	10.5.215.161 – 10.5.215.174	10.5.215.175
124	10.5.215.176/28	10.5.215.177 – 10.5.215.190	10.5.215.191
125	10.5.215.192/28	10.5.215.193 – 10.5.215.206	10.5.215.207
126	10.5.215.208/28	10.5.215.209 – 10.5.215.222	10.5.215.223
127	10.5.215.224/28	10.5.215.225 – 10.5.215.238	10.5.215.239
128	10.5.215.240/28	10.5.215.241 – 10.5.215.254	10.5.215.255
129	10.5.216.0/28	10.5.216.1 – 10.5.216.14	10.5.216.15
130	10.5.216.16/28	10.5.216.17 – 10.5.216.30	10.5.216.31
131	10.5.216.32/28	10.5.216.33 – 10.5.216.46	10.5.216.47
132	10.5.216.48/28	10.5.216.49 – 10.5.216.62	10.5.216.63
133	10.5.216.64/28	10.5.216.65 – 10.5.216.78	10.5.216.79
134	10.5.216.80/28	10.5.216.81 – 10.5.216.94	10.5.216.95
135	10.5.216.96/28	10.5.216.97 – 10.5.216.110	10.5.216.111
136	10.5.216.112/28	10.5.216.113 – 10.5.216.126	10.5.216.127
137	10.5.216.128/28	10.5.216.129 – 10.5.216.142	10.5.216.143
138	10.5.216.144/28	10.5.216.145 – 10.5.216.158	10.5.216.159
139	10.5.216.160/28	10.5.216.161 – 10.5.216.174	10.5.216.175
140	10.5.216.176/28	10.5.216.177 – 10.5.216.190	10.5.216.191
141	10.5.216.192/28	10.5.216.193 – 10.5.216.206	10.5.216.207
142	10.5.216.208/28	10.5.216.209 – 10.5.216.222	10.5.216.223
143	10.5.216.224/28	10.5.216.225 – 10.5.216.238	10.5.216.239
144	10.5.216.240/28	10.5.216.241 – 10.5.216.254	10.5.216.255
145	10.5.217.0/28	10.5.217.1 – 10.5.217.14	10.5.217.15
146	10.5.217.16/28	10.5.217.17 – 10.5.217.30	10.5.217.31
147	10.5.217.32/28	10.5.217.33 – 10.5.217.46	10.5.217.47
148	10.5.217.48/28	10.5.217.49 – 10.5.217.62	10.5.217.63
149	10.5.217.64/28	10.5.217.65 – 10.5.217.78	10.5.217.79
150	10.5.217.80/28	10.5.217.81 – 10.5.217.94	10.5.217.95
151	10.5.217.96/28	10.5.217.97 – 10.5.217.110	10.5.217.111
152	10.5.217.112/28	10.5.217.113 – 10.5.217.126	10.5.217.127
153	10.5.217.128/28	10.5.217.129 – 10.5.217.142	10.5.217.143
154	10.5.217.144/28	10.5.217.145 – 10.5.217.158	10.5.217.159
155	10.5.217.160/28	10.5.217.161 – 10.5.217.174	10.5.217.175
156	10.5.217.176/28	10.5.217.177 – 10.5.217.190	10.5.217.191
157	10.5.217.192/28	10.5.217.193 – 10.5.217.206	10.5.217.207
158	10.5.217.208/28	10.5.217.209 – 10.5.217.222	10.5.217.223
159	10.5.217.224/28	10.5.217.225 – 10.5.217.238	10.5.217.239
160	10.5.217.240/28	10.5.217.241 – 10.5.217.254	10.5.217.255
161	10.5.218.0/28	10.5.218.1 – 10.5.218.14	10.5.218.15
162	10.5.218.16/28	10.5.218.17 – 10.5.218.30	10.5.218.31
163	10.5.218.32/28	10.5.218.33 – 10.5.218.46	10.5.218.47
164	10.5.218.48/28	10.5.218.49 – 10.5.218.62	10.5.218.63
165	10.5.218.64/28	10.5.218.65 – 10.5.218.78	10.5.218.79
166	10.5.218.80/28	10.5.218.81 – 10.5.218.94	10.5.218.95
167	10.5.218.96/28	10.5.218.97 – 10.5.218.110	10.5.218.111
168	10.5.218.112/28	10.5.218.113 – 10.5.218.126	10.5.218.127
169	10.5.218.128/28	10.5.218.129 – 10.5.218.142	10.5.218.143
170	10.5.218.144/28	10.5.218.145 – 10.5.218.158	10.5.218.159
171	10.5.218.160/28	10.5.218.161 – 10.5.218.174	10.5.218.175
172	10.5.218.176/28	10.5.218.177 – 10.5.218.190	10.5.218.191
173	10.5.218.192/28	10.5.218.193 – 10.5.218.206	10.5.218.207
174	10.5.218.208/28	10.5.218.209 – 10.5.218.222	10.5.218.223
175	10.5.218.224/28	10.5.218.225 – 10.5.218.238	10.5.218.239
176	10.5.218.240/28	10.5.218.241 – 10.5.218.254	10.5.218.255
177	10.5.219.0/28	10.5.219.1 – 10.5.219.14	10.5.219.15
178	10.5.219.16/28	10.5.219.17 – 10.5.219.30	10.5.219.31
179	10.5.219.32/28	10.5.219.33 – 10.5.219.46	10.5.219.47
180	10.5.219.48/28	10.5.219.49 – 10.5.219.62	10.5.219.63
181	10.5.219.64/28	10.5.219.65 – 10.5.219.78	10.5.219.79
182	10.5.219.80/28	10.5.219.81 – 10.5.219.94	10.5.219.95
183	10.5.219.96/28	10.5.219.97 – 10.5.219.110	10.5.219.111
184	10.5.219.112/28	10.5.219.113 – 10.5.219.126	10.5.219.127
185	10.5.219.128/28	10.5.219.129 – 10.5.219.142	10.5.219.143
186	10.5.219.144/28	10.5.219.145 – 10.5.219.158	10.5.219.159
187	10.5.219.160/28	10.5.219.161 – 10.5.219.174	10.5.219.175
188	10.5.219.176/28	10.5.219.177 – 10.5.219.190	10.5.219.191
189	10.5.219.192/28	10.5.219.193 – 10.5.219.206	10.5.219.207
190	10.5.219.208/28	10.5.219.209 – 10.5.219.222	10.5.219.223
191	10.5.219.224/28	10.5.219.225 – 10.5.219.238	10.5.219.239
192	10.5.219.240/28	10.5.219.241 – 10.5.219.254	10.5.219.255
193	10.5.220.0/28	10.5.220.1 – 10.5.220.14	10.5.220.15
194	10.5.220.16/28	10.5.220.17 – 10.5.220.30	10.5.220.31
195	10.5.220.32/28	10.5.220.33 – 10.5.220.46	10.5.220.47
196	10.5.220.48/28	10.5.220.49 – 10.5.220.62	10.5.220.63
197	10.5.220.64/28	10.5.220.65 – 10.5.220.78	10.5.220.79
198	10.5.220.80/28	10.5.220.81 – 10.5.220.94	10.5.220.95
199	10.5.220.96/28	10.5.220.97 – 10.5.220.110	10.5.220.111
200	10.5.220.112/28	10.5.220.113 – 10.5.220.126	10.5.220.127
201	10.5.220.128/28	10.5.220.129 – 10.5.220.142	10.5.220.143
202	10.5.220.144/28	10.5.220.145 – 10.5.220.158	10.5.220.159
203	10.5.220.160/28	10.5.220.161 – 10.5.220.174	10.5.220.175
204	10.5.220.176/28	10.5.220.177 – 10.5.220.190	10.5.220.191
205	10.5.220.192/28	10.5.220.193 – 10.5.220.206	10.5.220.207
206	10.5.220.208/28	10.5.220.209 – 10.5.220.222	10.5.220.223
207	10.5.220.224/28	10.5.220.225 – 10.5.220.238	10.5.220.239
208	10.5.220.240/28	10.5.220.241 – 10.5.220.254	10.5.220.255
209	10.5.221.0/28	10.5.221.1 – 10.5.221.14	10.5.221.15
210	10.5.221.16/28	10.5.221.17 – 10.5.221.30	10.5.221.31
211	10.5.221.32/28	10.5.221.33 – 10.5.221.46	10.5.221.47
212	10.5.221.48/28	10.5.221.49 – 10.5.221.62	10.5.221.63
213	10.5.221.64/28	10.5.221.65 – 10.5.221.78	10.5.221.79
214	10.5.221.80/28	10.5.221.81 – 10.5.221.94	10.5.221.95
215	10.5.221.96/28	10.5.221.97 – 10.5.221.110	10.5.221.111
216	10.5.221.112/28	10.5.221.113 – 10.5.221.126	10.5.221.127
217	10.5.221.128/28	10.5.221.129 – 10.5.221.142	10.5.221.143
218	10.5.221.144/28	10.5.221.145 – 10.5.221.158	10.5.221.159
219	10.5.221.160/28	10.5.221.161 – 10.5.221.174	10.5.221.175
220	10.5.221.176/28	10.5.221.177 – 10.5.221.190	10.5.221.191
221	10.5.221.192/28	10.5.221.193 – 10.5.221.206	10.5.221.207
222	10.5.221.208/28	10.5.221.209 – 10.5.221.222	10.5.221.223
223	10.5.221.224/28	10.5.221.225 – 10.5.221.238	10.5.221.239
224	10.5.221.240/28	10.5.221.241 – 10.5.221.254	10.5.221.255
225	10.5.222.0/28	10.5.222.1 – 10.5.222.14	10.5.222.15
226	10.5.222.16/28	10.5.222.17 – 10.5.222.30	10.5.222.31
227	10.5.222.32/28	10.5.222.33 – 10.5.222.46	10.5.222.47
228	10.5.222.48/28	10.5.222.49 – 10.5.222.62	10.5.222.63
229	10.5.222.64/28	10.5.222.65 – 10.5.222.78	10.5.222.79
230	10.5.222.80/28	10.5.222.81 – 10.5.222.94	10.5.222.95
231	10.5.222.96/28	10.5.222.97 – 10.5.222.110	10.5.222.111
232	10.5.222.112/28	10.5.222.113 – 10.5.222.126	10.5.222.127
233	10.5.222.128/28	10.5.222.129 – 10.5.222.142	10.5.222.143
234	10.5.222.144/28	10.5.222.145 – 10.5.222.158	10.5.222.159
235	10.5.222.160/28	10.5.222.161 – 10.5.222.174	10.5.222.175
236	10.5.222.176/28	10.5.222.177 – 10.5.222.190	10.5.222.191
237	10.5.222.192/28	10.5.222.193 – 10.5.222.206	10.5.222.207
238	10.5.222.208/28	10.5.222.209 – 10.5.222.222	10.5.222.223
239	10.5.222.224/28	10.5.222.225 – 10.5.222.238	10.5.222.239
240	10.5.222.240/28	10.5.222.241 – 10.5.222.254	10.5.222.255
241	10.5.223.0/28	10.5.223.1 – 10.5.223.14	10.5.223.15
242	10.5.223.16/28	10.5.223.17 – 10.5.223.30	10.5.223.31
243	10.5.223.32/28	10.5.223.33 – 10.5.223.46	10.5.223.47
244	10.5.223.48/28	10.5.223.49 – 10.5.223.62	10.5.223.63
245	10.5.223.64/28	10.5.223.65 – 10.5.223.78	10.5.223.79
246	10.5.223.80/28	10.5.223.81 – 10.5.223.94	10.5.223.95
247	10.5.223.96/28	10.5.223.97 – 10.5.223.110	10.5.223.111
248	10.5.223.112/28	10.5.223.113 – 10.5.223.126	10.5.223.127
249	10.5.223.128/28	10.5.223.129 – 10.5.223.142	10.5.223.143
250	10.5.223.144/28	10.5.223.145 – 10.5.223.158	10.5.223.159
251	10.5.223.160/28	10.5.223.161 – 10.5.223.174	10.5.223.175
252	10.5.223.176/28	10.5.223.177 – 10.5.223.190	10.5.223.191
253	10.5.223.192/28	10.5.223.193 – 10.5.223.206	10.5.223.207
254	10.5.223.208/28	10.5.223.209 – 10.5.223.222	10.5.223.223
255	10.5.223.224/28	10.5.223.225 – 10.5.223.238	10.5.223.239
256	10.5.223.240/28	10.5.223.241 – 10.5.223.254	10.5.223.255

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 →