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)10.2.128.0/17

network10.2.128.0/17

broadcast10.2.255.255

first host10.2.128.1

last host10.2.255.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.2.128.0/17

address00001010.00000010.10000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.00000010.10000000.00000000

broadcast00001010.00000010.11111111.11111111

green = network part, grey = host part

hex0x0a028000

decimal167936000

reverse dns0.128.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8000

/17 split into /28 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.2.128.0/28	10.2.128.1 – 10.2.128.14	10.2.128.15
2	10.2.128.16/28	10.2.128.17 – 10.2.128.30	10.2.128.31
3	10.2.128.32/28	10.2.128.33 – 10.2.128.46	10.2.128.47
4	10.2.128.48/28	10.2.128.49 – 10.2.128.62	10.2.128.63
5	10.2.128.64/28	10.2.128.65 – 10.2.128.78	10.2.128.79
6	10.2.128.80/28	10.2.128.81 – 10.2.128.94	10.2.128.95
7	10.2.128.96/28	10.2.128.97 – 10.2.128.110	10.2.128.111
8	10.2.128.112/28	10.2.128.113 – 10.2.128.126	10.2.128.127
9	10.2.128.128/28	10.2.128.129 – 10.2.128.142	10.2.128.143
10	10.2.128.144/28	10.2.128.145 – 10.2.128.158	10.2.128.159
11	10.2.128.160/28	10.2.128.161 – 10.2.128.174	10.2.128.175
12	10.2.128.176/28	10.2.128.177 – 10.2.128.190	10.2.128.191
13	10.2.128.192/28	10.2.128.193 – 10.2.128.206	10.2.128.207
14	10.2.128.208/28	10.2.128.209 – 10.2.128.222	10.2.128.223
15	10.2.128.224/28	10.2.128.225 – 10.2.128.238	10.2.128.239
16	10.2.128.240/28	10.2.128.241 – 10.2.128.254	10.2.128.255
17	10.2.129.0/28	10.2.129.1 – 10.2.129.14	10.2.129.15
18	10.2.129.16/28	10.2.129.17 – 10.2.129.30	10.2.129.31
19	10.2.129.32/28	10.2.129.33 – 10.2.129.46	10.2.129.47
20	10.2.129.48/28	10.2.129.49 – 10.2.129.62	10.2.129.63
21	10.2.129.64/28	10.2.129.65 – 10.2.129.78	10.2.129.79
22	10.2.129.80/28	10.2.129.81 – 10.2.129.94	10.2.129.95
23	10.2.129.96/28	10.2.129.97 – 10.2.129.110	10.2.129.111
24	10.2.129.112/28	10.2.129.113 – 10.2.129.126	10.2.129.127
25	10.2.129.128/28	10.2.129.129 – 10.2.129.142	10.2.129.143
26	10.2.129.144/28	10.2.129.145 – 10.2.129.158	10.2.129.159
27	10.2.129.160/28	10.2.129.161 – 10.2.129.174	10.2.129.175
28	10.2.129.176/28	10.2.129.177 – 10.2.129.190	10.2.129.191
29	10.2.129.192/28	10.2.129.193 – 10.2.129.206	10.2.129.207
30	10.2.129.208/28	10.2.129.209 – 10.2.129.222	10.2.129.223
31	10.2.129.224/28	10.2.129.225 – 10.2.129.238	10.2.129.239
32	10.2.129.240/28	10.2.129.241 – 10.2.129.254	10.2.129.255
33	10.2.130.0/28	10.2.130.1 – 10.2.130.14	10.2.130.15
34	10.2.130.16/28	10.2.130.17 – 10.2.130.30	10.2.130.31
35	10.2.130.32/28	10.2.130.33 – 10.2.130.46	10.2.130.47
36	10.2.130.48/28	10.2.130.49 – 10.2.130.62	10.2.130.63
37	10.2.130.64/28	10.2.130.65 – 10.2.130.78	10.2.130.79
38	10.2.130.80/28	10.2.130.81 – 10.2.130.94	10.2.130.95
39	10.2.130.96/28	10.2.130.97 – 10.2.130.110	10.2.130.111
40	10.2.130.112/28	10.2.130.113 – 10.2.130.126	10.2.130.127
41	10.2.130.128/28	10.2.130.129 – 10.2.130.142	10.2.130.143
42	10.2.130.144/28	10.2.130.145 – 10.2.130.158	10.2.130.159
43	10.2.130.160/28	10.2.130.161 – 10.2.130.174	10.2.130.175
44	10.2.130.176/28	10.2.130.177 – 10.2.130.190	10.2.130.191
45	10.2.130.192/28	10.2.130.193 – 10.2.130.206	10.2.130.207
46	10.2.130.208/28	10.2.130.209 – 10.2.130.222	10.2.130.223
47	10.2.130.224/28	10.2.130.225 – 10.2.130.238	10.2.130.239
48	10.2.130.240/28	10.2.130.241 – 10.2.130.254	10.2.130.255
49	10.2.131.0/28	10.2.131.1 – 10.2.131.14	10.2.131.15
50	10.2.131.16/28	10.2.131.17 – 10.2.131.30	10.2.131.31
51	10.2.131.32/28	10.2.131.33 – 10.2.131.46	10.2.131.47
52	10.2.131.48/28	10.2.131.49 – 10.2.131.62	10.2.131.63
53	10.2.131.64/28	10.2.131.65 – 10.2.131.78	10.2.131.79
54	10.2.131.80/28	10.2.131.81 – 10.2.131.94	10.2.131.95
55	10.2.131.96/28	10.2.131.97 – 10.2.131.110	10.2.131.111
56	10.2.131.112/28	10.2.131.113 – 10.2.131.126	10.2.131.127
57	10.2.131.128/28	10.2.131.129 – 10.2.131.142	10.2.131.143
58	10.2.131.144/28	10.2.131.145 – 10.2.131.158	10.2.131.159
59	10.2.131.160/28	10.2.131.161 – 10.2.131.174	10.2.131.175
60	10.2.131.176/28	10.2.131.177 – 10.2.131.190	10.2.131.191
61	10.2.131.192/28	10.2.131.193 – 10.2.131.206	10.2.131.207
62	10.2.131.208/28	10.2.131.209 – 10.2.131.222	10.2.131.223
63	10.2.131.224/28	10.2.131.225 – 10.2.131.238	10.2.131.239
64	10.2.131.240/28	10.2.131.241 – 10.2.131.254	10.2.131.255
65	10.2.132.0/28	10.2.132.1 – 10.2.132.14	10.2.132.15
66	10.2.132.16/28	10.2.132.17 – 10.2.132.30	10.2.132.31
67	10.2.132.32/28	10.2.132.33 – 10.2.132.46	10.2.132.47
68	10.2.132.48/28	10.2.132.49 – 10.2.132.62	10.2.132.63
69	10.2.132.64/28	10.2.132.65 – 10.2.132.78	10.2.132.79
70	10.2.132.80/28	10.2.132.81 – 10.2.132.94	10.2.132.95
71	10.2.132.96/28	10.2.132.97 – 10.2.132.110	10.2.132.111
72	10.2.132.112/28	10.2.132.113 – 10.2.132.126	10.2.132.127
73	10.2.132.128/28	10.2.132.129 – 10.2.132.142	10.2.132.143
74	10.2.132.144/28	10.2.132.145 – 10.2.132.158	10.2.132.159
75	10.2.132.160/28	10.2.132.161 – 10.2.132.174	10.2.132.175
76	10.2.132.176/28	10.2.132.177 – 10.2.132.190	10.2.132.191
77	10.2.132.192/28	10.2.132.193 – 10.2.132.206	10.2.132.207
78	10.2.132.208/28	10.2.132.209 – 10.2.132.222	10.2.132.223
79	10.2.132.224/28	10.2.132.225 – 10.2.132.238	10.2.132.239
80	10.2.132.240/28	10.2.132.241 – 10.2.132.254	10.2.132.255
81	10.2.133.0/28	10.2.133.1 – 10.2.133.14	10.2.133.15
82	10.2.133.16/28	10.2.133.17 – 10.2.133.30	10.2.133.31
83	10.2.133.32/28	10.2.133.33 – 10.2.133.46	10.2.133.47
84	10.2.133.48/28	10.2.133.49 – 10.2.133.62	10.2.133.63
85	10.2.133.64/28	10.2.133.65 – 10.2.133.78	10.2.133.79
86	10.2.133.80/28	10.2.133.81 – 10.2.133.94	10.2.133.95
87	10.2.133.96/28	10.2.133.97 – 10.2.133.110	10.2.133.111
88	10.2.133.112/28	10.2.133.113 – 10.2.133.126	10.2.133.127
89	10.2.133.128/28	10.2.133.129 – 10.2.133.142	10.2.133.143
90	10.2.133.144/28	10.2.133.145 – 10.2.133.158	10.2.133.159
91	10.2.133.160/28	10.2.133.161 – 10.2.133.174	10.2.133.175
92	10.2.133.176/28	10.2.133.177 – 10.2.133.190	10.2.133.191
93	10.2.133.192/28	10.2.133.193 – 10.2.133.206	10.2.133.207
94	10.2.133.208/28	10.2.133.209 – 10.2.133.222	10.2.133.223
95	10.2.133.224/28	10.2.133.225 – 10.2.133.238	10.2.133.239
96	10.2.133.240/28	10.2.133.241 – 10.2.133.254	10.2.133.255
97	10.2.134.0/28	10.2.134.1 – 10.2.134.14	10.2.134.15
98	10.2.134.16/28	10.2.134.17 – 10.2.134.30	10.2.134.31
99	10.2.134.32/28	10.2.134.33 – 10.2.134.46	10.2.134.47
100	10.2.134.48/28	10.2.134.49 – 10.2.134.62	10.2.134.63
101	10.2.134.64/28	10.2.134.65 – 10.2.134.78	10.2.134.79
102	10.2.134.80/28	10.2.134.81 – 10.2.134.94	10.2.134.95
103	10.2.134.96/28	10.2.134.97 – 10.2.134.110	10.2.134.111
104	10.2.134.112/28	10.2.134.113 – 10.2.134.126	10.2.134.127
105	10.2.134.128/28	10.2.134.129 – 10.2.134.142	10.2.134.143
106	10.2.134.144/28	10.2.134.145 – 10.2.134.158	10.2.134.159
107	10.2.134.160/28	10.2.134.161 – 10.2.134.174	10.2.134.175
108	10.2.134.176/28	10.2.134.177 – 10.2.134.190	10.2.134.191
109	10.2.134.192/28	10.2.134.193 – 10.2.134.206	10.2.134.207
110	10.2.134.208/28	10.2.134.209 – 10.2.134.222	10.2.134.223
111	10.2.134.224/28	10.2.134.225 – 10.2.134.238	10.2.134.239
112	10.2.134.240/28	10.2.134.241 – 10.2.134.254	10.2.134.255
113	10.2.135.0/28	10.2.135.1 – 10.2.135.14	10.2.135.15
114	10.2.135.16/28	10.2.135.17 – 10.2.135.30	10.2.135.31
115	10.2.135.32/28	10.2.135.33 – 10.2.135.46	10.2.135.47
116	10.2.135.48/28	10.2.135.49 – 10.2.135.62	10.2.135.63
117	10.2.135.64/28	10.2.135.65 – 10.2.135.78	10.2.135.79
118	10.2.135.80/28	10.2.135.81 – 10.2.135.94	10.2.135.95
119	10.2.135.96/28	10.2.135.97 – 10.2.135.110	10.2.135.111
120	10.2.135.112/28	10.2.135.113 – 10.2.135.126	10.2.135.127
121	10.2.135.128/28	10.2.135.129 – 10.2.135.142	10.2.135.143
122	10.2.135.144/28	10.2.135.145 – 10.2.135.158	10.2.135.159
123	10.2.135.160/28	10.2.135.161 – 10.2.135.174	10.2.135.175
124	10.2.135.176/28	10.2.135.177 – 10.2.135.190	10.2.135.191
125	10.2.135.192/28	10.2.135.193 – 10.2.135.206	10.2.135.207
126	10.2.135.208/28	10.2.135.209 – 10.2.135.222	10.2.135.223
127	10.2.135.224/28	10.2.135.225 – 10.2.135.238	10.2.135.239
128	10.2.135.240/28	10.2.135.241 – 10.2.135.254	10.2.135.255
129	10.2.136.0/28	10.2.136.1 – 10.2.136.14	10.2.136.15
130	10.2.136.16/28	10.2.136.17 – 10.2.136.30	10.2.136.31
131	10.2.136.32/28	10.2.136.33 – 10.2.136.46	10.2.136.47
132	10.2.136.48/28	10.2.136.49 – 10.2.136.62	10.2.136.63
133	10.2.136.64/28	10.2.136.65 – 10.2.136.78	10.2.136.79
134	10.2.136.80/28	10.2.136.81 – 10.2.136.94	10.2.136.95
135	10.2.136.96/28	10.2.136.97 – 10.2.136.110	10.2.136.111
136	10.2.136.112/28	10.2.136.113 – 10.2.136.126	10.2.136.127
137	10.2.136.128/28	10.2.136.129 – 10.2.136.142	10.2.136.143
138	10.2.136.144/28	10.2.136.145 – 10.2.136.158	10.2.136.159
139	10.2.136.160/28	10.2.136.161 – 10.2.136.174	10.2.136.175
140	10.2.136.176/28	10.2.136.177 – 10.2.136.190	10.2.136.191
141	10.2.136.192/28	10.2.136.193 – 10.2.136.206	10.2.136.207
142	10.2.136.208/28	10.2.136.209 – 10.2.136.222	10.2.136.223
143	10.2.136.224/28	10.2.136.225 – 10.2.136.238	10.2.136.239
144	10.2.136.240/28	10.2.136.241 – 10.2.136.254	10.2.136.255
145	10.2.137.0/28	10.2.137.1 – 10.2.137.14	10.2.137.15
146	10.2.137.16/28	10.2.137.17 – 10.2.137.30	10.2.137.31
147	10.2.137.32/28	10.2.137.33 – 10.2.137.46	10.2.137.47
148	10.2.137.48/28	10.2.137.49 – 10.2.137.62	10.2.137.63
149	10.2.137.64/28	10.2.137.65 – 10.2.137.78	10.2.137.79
150	10.2.137.80/28	10.2.137.81 – 10.2.137.94	10.2.137.95
151	10.2.137.96/28	10.2.137.97 – 10.2.137.110	10.2.137.111
152	10.2.137.112/28	10.2.137.113 – 10.2.137.126	10.2.137.127
153	10.2.137.128/28	10.2.137.129 – 10.2.137.142	10.2.137.143
154	10.2.137.144/28	10.2.137.145 – 10.2.137.158	10.2.137.159
155	10.2.137.160/28	10.2.137.161 – 10.2.137.174	10.2.137.175
156	10.2.137.176/28	10.2.137.177 – 10.2.137.190	10.2.137.191
157	10.2.137.192/28	10.2.137.193 – 10.2.137.206	10.2.137.207
158	10.2.137.208/28	10.2.137.209 – 10.2.137.222	10.2.137.223
159	10.2.137.224/28	10.2.137.225 – 10.2.137.238	10.2.137.239
160	10.2.137.240/28	10.2.137.241 – 10.2.137.254	10.2.137.255
161	10.2.138.0/28	10.2.138.1 – 10.2.138.14	10.2.138.15
162	10.2.138.16/28	10.2.138.17 – 10.2.138.30	10.2.138.31
163	10.2.138.32/28	10.2.138.33 – 10.2.138.46	10.2.138.47
164	10.2.138.48/28	10.2.138.49 – 10.2.138.62	10.2.138.63
165	10.2.138.64/28	10.2.138.65 – 10.2.138.78	10.2.138.79
166	10.2.138.80/28	10.2.138.81 – 10.2.138.94	10.2.138.95
167	10.2.138.96/28	10.2.138.97 – 10.2.138.110	10.2.138.111
168	10.2.138.112/28	10.2.138.113 – 10.2.138.126	10.2.138.127
169	10.2.138.128/28	10.2.138.129 – 10.2.138.142	10.2.138.143
170	10.2.138.144/28	10.2.138.145 – 10.2.138.158	10.2.138.159
171	10.2.138.160/28	10.2.138.161 – 10.2.138.174	10.2.138.175
172	10.2.138.176/28	10.2.138.177 – 10.2.138.190	10.2.138.191
173	10.2.138.192/28	10.2.138.193 – 10.2.138.206	10.2.138.207
174	10.2.138.208/28	10.2.138.209 – 10.2.138.222	10.2.138.223
175	10.2.138.224/28	10.2.138.225 – 10.2.138.238	10.2.138.239
176	10.2.138.240/28	10.2.138.241 – 10.2.138.254	10.2.138.255
177	10.2.139.0/28	10.2.139.1 – 10.2.139.14	10.2.139.15
178	10.2.139.16/28	10.2.139.17 – 10.2.139.30	10.2.139.31
179	10.2.139.32/28	10.2.139.33 – 10.2.139.46	10.2.139.47
180	10.2.139.48/28	10.2.139.49 – 10.2.139.62	10.2.139.63
181	10.2.139.64/28	10.2.139.65 – 10.2.139.78	10.2.139.79
182	10.2.139.80/28	10.2.139.81 – 10.2.139.94	10.2.139.95
183	10.2.139.96/28	10.2.139.97 – 10.2.139.110	10.2.139.111
184	10.2.139.112/28	10.2.139.113 – 10.2.139.126	10.2.139.127
185	10.2.139.128/28	10.2.139.129 – 10.2.139.142	10.2.139.143
186	10.2.139.144/28	10.2.139.145 – 10.2.139.158	10.2.139.159
187	10.2.139.160/28	10.2.139.161 – 10.2.139.174	10.2.139.175
188	10.2.139.176/28	10.2.139.177 – 10.2.139.190	10.2.139.191
189	10.2.139.192/28	10.2.139.193 – 10.2.139.206	10.2.139.207
190	10.2.139.208/28	10.2.139.209 – 10.2.139.222	10.2.139.223
191	10.2.139.224/28	10.2.139.225 – 10.2.139.238	10.2.139.239
192	10.2.139.240/28	10.2.139.241 – 10.2.139.254	10.2.139.255
193	10.2.140.0/28	10.2.140.1 – 10.2.140.14	10.2.140.15
194	10.2.140.16/28	10.2.140.17 – 10.2.140.30	10.2.140.31
195	10.2.140.32/28	10.2.140.33 – 10.2.140.46	10.2.140.47
196	10.2.140.48/28	10.2.140.49 – 10.2.140.62	10.2.140.63
197	10.2.140.64/28	10.2.140.65 – 10.2.140.78	10.2.140.79
198	10.2.140.80/28	10.2.140.81 – 10.2.140.94	10.2.140.95
199	10.2.140.96/28	10.2.140.97 – 10.2.140.110	10.2.140.111
200	10.2.140.112/28	10.2.140.113 – 10.2.140.126	10.2.140.127
201	10.2.140.128/28	10.2.140.129 – 10.2.140.142	10.2.140.143
202	10.2.140.144/28	10.2.140.145 – 10.2.140.158	10.2.140.159
203	10.2.140.160/28	10.2.140.161 – 10.2.140.174	10.2.140.175
204	10.2.140.176/28	10.2.140.177 – 10.2.140.190	10.2.140.191
205	10.2.140.192/28	10.2.140.193 – 10.2.140.206	10.2.140.207
206	10.2.140.208/28	10.2.140.209 – 10.2.140.222	10.2.140.223
207	10.2.140.224/28	10.2.140.225 – 10.2.140.238	10.2.140.239
208	10.2.140.240/28	10.2.140.241 – 10.2.140.254	10.2.140.255
209	10.2.141.0/28	10.2.141.1 – 10.2.141.14	10.2.141.15
210	10.2.141.16/28	10.2.141.17 – 10.2.141.30	10.2.141.31
211	10.2.141.32/28	10.2.141.33 – 10.2.141.46	10.2.141.47
212	10.2.141.48/28	10.2.141.49 – 10.2.141.62	10.2.141.63
213	10.2.141.64/28	10.2.141.65 – 10.2.141.78	10.2.141.79
214	10.2.141.80/28	10.2.141.81 – 10.2.141.94	10.2.141.95
215	10.2.141.96/28	10.2.141.97 – 10.2.141.110	10.2.141.111
216	10.2.141.112/28	10.2.141.113 – 10.2.141.126	10.2.141.127
217	10.2.141.128/28	10.2.141.129 – 10.2.141.142	10.2.141.143
218	10.2.141.144/28	10.2.141.145 – 10.2.141.158	10.2.141.159
219	10.2.141.160/28	10.2.141.161 – 10.2.141.174	10.2.141.175
220	10.2.141.176/28	10.2.141.177 – 10.2.141.190	10.2.141.191
221	10.2.141.192/28	10.2.141.193 – 10.2.141.206	10.2.141.207
222	10.2.141.208/28	10.2.141.209 – 10.2.141.222	10.2.141.223
223	10.2.141.224/28	10.2.141.225 – 10.2.141.238	10.2.141.239
224	10.2.141.240/28	10.2.141.241 – 10.2.141.254	10.2.141.255
225	10.2.142.0/28	10.2.142.1 – 10.2.142.14	10.2.142.15
226	10.2.142.16/28	10.2.142.17 – 10.2.142.30	10.2.142.31
227	10.2.142.32/28	10.2.142.33 – 10.2.142.46	10.2.142.47
228	10.2.142.48/28	10.2.142.49 – 10.2.142.62	10.2.142.63
229	10.2.142.64/28	10.2.142.65 – 10.2.142.78	10.2.142.79
230	10.2.142.80/28	10.2.142.81 – 10.2.142.94	10.2.142.95
231	10.2.142.96/28	10.2.142.97 – 10.2.142.110	10.2.142.111
232	10.2.142.112/28	10.2.142.113 – 10.2.142.126	10.2.142.127
233	10.2.142.128/28	10.2.142.129 – 10.2.142.142	10.2.142.143
234	10.2.142.144/28	10.2.142.145 – 10.2.142.158	10.2.142.159
235	10.2.142.160/28	10.2.142.161 – 10.2.142.174	10.2.142.175
236	10.2.142.176/28	10.2.142.177 – 10.2.142.190	10.2.142.191
237	10.2.142.192/28	10.2.142.193 – 10.2.142.206	10.2.142.207
238	10.2.142.208/28	10.2.142.209 – 10.2.142.222	10.2.142.223
239	10.2.142.224/28	10.2.142.225 – 10.2.142.238	10.2.142.239
240	10.2.142.240/28	10.2.142.241 – 10.2.142.254	10.2.142.255
241	10.2.143.0/28	10.2.143.1 – 10.2.143.14	10.2.143.15
242	10.2.143.16/28	10.2.143.17 – 10.2.143.30	10.2.143.31
243	10.2.143.32/28	10.2.143.33 – 10.2.143.46	10.2.143.47
244	10.2.143.48/28	10.2.143.49 – 10.2.143.62	10.2.143.63
245	10.2.143.64/28	10.2.143.65 – 10.2.143.78	10.2.143.79
246	10.2.143.80/28	10.2.143.81 – 10.2.143.94	10.2.143.95
247	10.2.143.96/28	10.2.143.97 – 10.2.143.110	10.2.143.111
248	10.2.143.112/28	10.2.143.113 – 10.2.143.126	10.2.143.127
249	10.2.143.128/28	10.2.143.129 – 10.2.143.142	10.2.143.143
250	10.2.143.144/28	10.2.143.145 – 10.2.143.158	10.2.143.159
251	10.2.143.160/28	10.2.143.161 – 10.2.143.174	10.2.143.175
252	10.2.143.176/28	10.2.143.177 – 10.2.143.190	10.2.143.191
253	10.2.143.192/28	10.2.143.193 – 10.2.143.206	10.2.143.207
254	10.2.143.208/28	10.2.143.209 – 10.2.143.222	10.2.143.223
255	10.2.143.224/28	10.2.143.225 – 10.2.143.238	10.2.143.239
256	10.2.143.240/28	10.2.143.241 – 10.2.143.254	10.2.143.255

showing 256 of 2,048

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 /17
/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	1
/18	255.255.192.0	16,384	16,382	2 split →
/19	255.255.224.0	8,192	8,190	4 split →
/20	255.255.240.0	4,096	4,094	8 split →
/21	255.255.248.0	2,048	2,046	16 split →
/22	255.255.252.0	1,024	1,022	32 split →
/23	255.255.254.0	512	510	64 split →
/24	255.255.255.0	256	254	128 split →
/25	255.255.255.128	128	126	256 split →
/26	255.255.255.192	64	62	512 split →
/27	255.255.255.224	32	30	1,024 split →
/28	255.255.255.240	16	14	2,048 split →
/29	255.255.255.248	8	6	4,096 split →
/30	255.255.255.252	4	2	8,192 split →
/31	255.255.255.254	2	2	16,384 split →
/32	255.255.255.255	1	1	32,768 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 →