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)10.90.128.0/17

network10.90.128.0/17

broadcast10.90.255.255

first host10.90.128.1

last host10.90.255.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.90.128.0/17

address00001010.01011010.10000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.01011010.10000000.00000000

broadcast00001010.01011010.11111111.11111111

green = network part, grey = host part

hex0x0a5a8000

decimal173703168

reverse dns0.128.90.10.in-addr.arpa

ipv4-mapped::ffff:a5a:8000

/17 split into /28 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.90.128.0/28	10.90.128.1 – 10.90.128.14	10.90.128.15
2	10.90.128.16/28	10.90.128.17 – 10.90.128.30	10.90.128.31
3	10.90.128.32/28	10.90.128.33 – 10.90.128.46	10.90.128.47
4	10.90.128.48/28	10.90.128.49 – 10.90.128.62	10.90.128.63
5	10.90.128.64/28	10.90.128.65 – 10.90.128.78	10.90.128.79
6	10.90.128.80/28	10.90.128.81 – 10.90.128.94	10.90.128.95
7	10.90.128.96/28	10.90.128.97 – 10.90.128.110	10.90.128.111
8	10.90.128.112/28	10.90.128.113 – 10.90.128.126	10.90.128.127
9	10.90.128.128/28	10.90.128.129 – 10.90.128.142	10.90.128.143
10	10.90.128.144/28	10.90.128.145 – 10.90.128.158	10.90.128.159
11	10.90.128.160/28	10.90.128.161 – 10.90.128.174	10.90.128.175
12	10.90.128.176/28	10.90.128.177 – 10.90.128.190	10.90.128.191
13	10.90.128.192/28	10.90.128.193 – 10.90.128.206	10.90.128.207
14	10.90.128.208/28	10.90.128.209 – 10.90.128.222	10.90.128.223
15	10.90.128.224/28	10.90.128.225 – 10.90.128.238	10.90.128.239
16	10.90.128.240/28	10.90.128.241 – 10.90.128.254	10.90.128.255
17	10.90.129.0/28	10.90.129.1 – 10.90.129.14	10.90.129.15
18	10.90.129.16/28	10.90.129.17 – 10.90.129.30	10.90.129.31
19	10.90.129.32/28	10.90.129.33 – 10.90.129.46	10.90.129.47
20	10.90.129.48/28	10.90.129.49 – 10.90.129.62	10.90.129.63
21	10.90.129.64/28	10.90.129.65 – 10.90.129.78	10.90.129.79
22	10.90.129.80/28	10.90.129.81 – 10.90.129.94	10.90.129.95
23	10.90.129.96/28	10.90.129.97 – 10.90.129.110	10.90.129.111
24	10.90.129.112/28	10.90.129.113 – 10.90.129.126	10.90.129.127
25	10.90.129.128/28	10.90.129.129 – 10.90.129.142	10.90.129.143
26	10.90.129.144/28	10.90.129.145 – 10.90.129.158	10.90.129.159
27	10.90.129.160/28	10.90.129.161 – 10.90.129.174	10.90.129.175
28	10.90.129.176/28	10.90.129.177 – 10.90.129.190	10.90.129.191
29	10.90.129.192/28	10.90.129.193 – 10.90.129.206	10.90.129.207
30	10.90.129.208/28	10.90.129.209 – 10.90.129.222	10.90.129.223
31	10.90.129.224/28	10.90.129.225 – 10.90.129.238	10.90.129.239
32	10.90.129.240/28	10.90.129.241 – 10.90.129.254	10.90.129.255
33	10.90.130.0/28	10.90.130.1 – 10.90.130.14	10.90.130.15
34	10.90.130.16/28	10.90.130.17 – 10.90.130.30	10.90.130.31
35	10.90.130.32/28	10.90.130.33 – 10.90.130.46	10.90.130.47
36	10.90.130.48/28	10.90.130.49 – 10.90.130.62	10.90.130.63
37	10.90.130.64/28	10.90.130.65 – 10.90.130.78	10.90.130.79
38	10.90.130.80/28	10.90.130.81 – 10.90.130.94	10.90.130.95
39	10.90.130.96/28	10.90.130.97 – 10.90.130.110	10.90.130.111
40	10.90.130.112/28	10.90.130.113 – 10.90.130.126	10.90.130.127
41	10.90.130.128/28	10.90.130.129 – 10.90.130.142	10.90.130.143
42	10.90.130.144/28	10.90.130.145 – 10.90.130.158	10.90.130.159
43	10.90.130.160/28	10.90.130.161 – 10.90.130.174	10.90.130.175
44	10.90.130.176/28	10.90.130.177 – 10.90.130.190	10.90.130.191
45	10.90.130.192/28	10.90.130.193 – 10.90.130.206	10.90.130.207
46	10.90.130.208/28	10.90.130.209 – 10.90.130.222	10.90.130.223
47	10.90.130.224/28	10.90.130.225 – 10.90.130.238	10.90.130.239
48	10.90.130.240/28	10.90.130.241 – 10.90.130.254	10.90.130.255
49	10.90.131.0/28	10.90.131.1 – 10.90.131.14	10.90.131.15
50	10.90.131.16/28	10.90.131.17 – 10.90.131.30	10.90.131.31
51	10.90.131.32/28	10.90.131.33 – 10.90.131.46	10.90.131.47
52	10.90.131.48/28	10.90.131.49 – 10.90.131.62	10.90.131.63
53	10.90.131.64/28	10.90.131.65 – 10.90.131.78	10.90.131.79
54	10.90.131.80/28	10.90.131.81 – 10.90.131.94	10.90.131.95
55	10.90.131.96/28	10.90.131.97 – 10.90.131.110	10.90.131.111
56	10.90.131.112/28	10.90.131.113 – 10.90.131.126	10.90.131.127
57	10.90.131.128/28	10.90.131.129 – 10.90.131.142	10.90.131.143
58	10.90.131.144/28	10.90.131.145 – 10.90.131.158	10.90.131.159
59	10.90.131.160/28	10.90.131.161 – 10.90.131.174	10.90.131.175
60	10.90.131.176/28	10.90.131.177 – 10.90.131.190	10.90.131.191
61	10.90.131.192/28	10.90.131.193 – 10.90.131.206	10.90.131.207
62	10.90.131.208/28	10.90.131.209 – 10.90.131.222	10.90.131.223
63	10.90.131.224/28	10.90.131.225 – 10.90.131.238	10.90.131.239
64	10.90.131.240/28	10.90.131.241 – 10.90.131.254	10.90.131.255
65	10.90.132.0/28	10.90.132.1 – 10.90.132.14	10.90.132.15
66	10.90.132.16/28	10.90.132.17 – 10.90.132.30	10.90.132.31
67	10.90.132.32/28	10.90.132.33 – 10.90.132.46	10.90.132.47
68	10.90.132.48/28	10.90.132.49 – 10.90.132.62	10.90.132.63
69	10.90.132.64/28	10.90.132.65 – 10.90.132.78	10.90.132.79
70	10.90.132.80/28	10.90.132.81 – 10.90.132.94	10.90.132.95
71	10.90.132.96/28	10.90.132.97 – 10.90.132.110	10.90.132.111
72	10.90.132.112/28	10.90.132.113 – 10.90.132.126	10.90.132.127
73	10.90.132.128/28	10.90.132.129 – 10.90.132.142	10.90.132.143
74	10.90.132.144/28	10.90.132.145 – 10.90.132.158	10.90.132.159
75	10.90.132.160/28	10.90.132.161 – 10.90.132.174	10.90.132.175
76	10.90.132.176/28	10.90.132.177 – 10.90.132.190	10.90.132.191
77	10.90.132.192/28	10.90.132.193 – 10.90.132.206	10.90.132.207
78	10.90.132.208/28	10.90.132.209 – 10.90.132.222	10.90.132.223
79	10.90.132.224/28	10.90.132.225 – 10.90.132.238	10.90.132.239
80	10.90.132.240/28	10.90.132.241 – 10.90.132.254	10.90.132.255
81	10.90.133.0/28	10.90.133.1 – 10.90.133.14	10.90.133.15
82	10.90.133.16/28	10.90.133.17 – 10.90.133.30	10.90.133.31
83	10.90.133.32/28	10.90.133.33 – 10.90.133.46	10.90.133.47
84	10.90.133.48/28	10.90.133.49 – 10.90.133.62	10.90.133.63
85	10.90.133.64/28	10.90.133.65 – 10.90.133.78	10.90.133.79
86	10.90.133.80/28	10.90.133.81 – 10.90.133.94	10.90.133.95
87	10.90.133.96/28	10.90.133.97 – 10.90.133.110	10.90.133.111
88	10.90.133.112/28	10.90.133.113 – 10.90.133.126	10.90.133.127
89	10.90.133.128/28	10.90.133.129 – 10.90.133.142	10.90.133.143
90	10.90.133.144/28	10.90.133.145 – 10.90.133.158	10.90.133.159
91	10.90.133.160/28	10.90.133.161 – 10.90.133.174	10.90.133.175
92	10.90.133.176/28	10.90.133.177 – 10.90.133.190	10.90.133.191
93	10.90.133.192/28	10.90.133.193 – 10.90.133.206	10.90.133.207
94	10.90.133.208/28	10.90.133.209 – 10.90.133.222	10.90.133.223
95	10.90.133.224/28	10.90.133.225 – 10.90.133.238	10.90.133.239
96	10.90.133.240/28	10.90.133.241 – 10.90.133.254	10.90.133.255
97	10.90.134.0/28	10.90.134.1 – 10.90.134.14	10.90.134.15
98	10.90.134.16/28	10.90.134.17 – 10.90.134.30	10.90.134.31
99	10.90.134.32/28	10.90.134.33 – 10.90.134.46	10.90.134.47
100	10.90.134.48/28	10.90.134.49 – 10.90.134.62	10.90.134.63
101	10.90.134.64/28	10.90.134.65 – 10.90.134.78	10.90.134.79
102	10.90.134.80/28	10.90.134.81 – 10.90.134.94	10.90.134.95
103	10.90.134.96/28	10.90.134.97 – 10.90.134.110	10.90.134.111
104	10.90.134.112/28	10.90.134.113 – 10.90.134.126	10.90.134.127
105	10.90.134.128/28	10.90.134.129 – 10.90.134.142	10.90.134.143
106	10.90.134.144/28	10.90.134.145 – 10.90.134.158	10.90.134.159
107	10.90.134.160/28	10.90.134.161 – 10.90.134.174	10.90.134.175
108	10.90.134.176/28	10.90.134.177 – 10.90.134.190	10.90.134.191
109	10.90.134.192/28	10.90.134.193 – 10.90.134.206	10.90.134.207
110	10.90.134.208/28	10.90.134.209 – 10.90.134.222	10.90.134.223
111	10.90.134.224/28	10.90.134.225 – 10.90.134.238	10.90.134.239
112	10.90.134.240/28	10.90.134.241 – 10.90.134.254	10.90.134.255
113	10.90.135.0/28	10.90.135.1 – 10.90.135.14	10.90.135.15
114	10.90.135.16/28	10.90.135.17 – 10.90.135.30	10.90.135.31
115	10.90.135.32/28	10.90.135.33 – 10.90.135.46	10.90.135.47
116	10.90.135.48/28	10.90.135.49 – 10.90.135.62	10.90.135.63
117	10.90.135.64/28	10.90.135.65 – 10.90.135.78	10.90.135.79
118	10.90.135.80/28	10.90.135.81 – 10.90.135.94	10.90.135.95
119	10.90.135.96/28	10.90.135.97 – 10.90.135.110	10.90.135.111
120	10.90.135.112/28	10.90.135.113 – 10.90.135.126	10.90.135.127
121	10.90.135.128/28	10.90.135.129 – 10.90.135.142	10.90.135.143
122	10.90.135.144/28	10.90.135.145 – 10.90.135.158	10.90.135.159
123	10.90.135.160/28	10.90.135.161 – 10.90.135.174	10.90.135.175
124	10.90.135.176/28	10.90.135.177 – 10.90.135.190	10.90.135.191
125	10.90.135.192/28	10.90.135.193 – 10.90.135.206	10.90.135.207
126	10.90.135.208/28	10.90.135.209 – 10.90.135.222	10.90.135.223
127	10.90.135.224/28	10.90.135.225 – 10.90.135.238	10.90.135.239
128	10.90.135.240/28	10.90.135.241 – 10.90.135.254	10.90.135.255
129	10.90.136.0/28	10.90.136.1 – 10.90.136.14	10.90.136.15
130	10.90.136.16/28	10.90.136.17 – 10.90.136.30	10.90.136.31
131	10.90.136.32/28	10.90.136.33 – 10.90.136.46	10.90.136.47
132	10.90.136.48/28	10.90.136.49 – 10.90.136.62	10.90.136.63
133	10.90.136.64/28	10.90.136.65 – 10.90.136.78	10.90.136.79
134	10.90.136.80/28	10.90.136.81 – 10.90.136.94	10.90.136.95
135	10.90.136.96/28	10.90.136.97 – 10.90.136.110	10.90.136.111
136	10.90.136.112/28	10.90.136.113 – 10.90.136.126	10.90.136.127
137	10.90.136.128/28	10.90.136.129 – 10.90.136.142	10.90.136.143
138	10.90.136.144/28	10.90.136.145 – 10.90.136.158	10.90.136.159
139	10.90.136.160/28	10.90.136.161 – 10.90.136.174	10.90.136.175
140	10.90.136.176/28	10.90.136.177 – 10.90.136.190	10.90.136.191
141	10.90.136.192/28	10.90.136.193 – 10.90.136.206	10.90.136.207
142	10.90.136.208/28	10.90.136.209 – 10.90.136.222	10.90.136.223
143	10.90.136.224/28	10.90.136.225 – 10.90.136.238	10.90.136.239
144	10.90.136.240/28	10.90.136.241 – 10.90.136.254	10.90.136.255
145	10.90.137.0/28	10.90.137.1 – 10.90.137.14	10.90.137.15
146	10.90.137.16/28	10.90.137.17 – 10.90.137.30	10.90.137.31
147	10.90.137.32/28	10.90.137.33 – 10.90.137.46	10.90.137.47
148	10.90.137.48/28	10.90.137.49 – 10.90.137.62	10.90.137.63
149	10.90.137.64/28	10.90.137.65 – 10.90.137.78	10.90.137.79
150	10.90.137.80/28	10.90.137.81 – 10.90.137.94	10.90.137.95
151	10.90.137.96/28	10.90.137.97 – 10.90.137.110	10.90.137.111
152	10.90.137.112/28	10.90.137.113 – 10.90.137.126	10.90.137.127
153	10.90.137.128/28	10.90.137.129 – 10.90.137.142	10.90.137.143
154	10.90.137.144/28	10.90.137.145 – 10.90.137.158	10.90.137.159
155	10.90.137.160/28	10.90.137.161 – 10.90.137.174	10.90.137.175
156	10.90.137.176/28	10.90.137.177 – 10.90.137.190	10.90.137.191
157	10.90.137.192/28	10.90.137.193 – 10.90.137.206	10.90.137.207
158	10.90.137.208/28	10.90.137.209 – 10.90.137.222	10.90.137.223
159	10.90.137.224/28	10.90.137.225 – 10.90.137.238	10.90.137.239
160	10.90.137.240/28	10.90.137.241 – 10.90.137.254	10.90.137.255
161	10.90.138.0/28	10.90.138.1 – 10.90.138.14	10.90.138.15
162	10.90.138.16/28	10.90.138.17 – 10.90.138.30	10.90.138.31
163	10.90.138.32/28	10.90.138.33 – 10.90.138.46	10.90.138.47
164	10.90.138.48/28	10.90.138.49 – 10.90.138.62	10.90.138.63
165	10.90.138.64/28	10.90.138.65 – 10.90.138.78	10.90.138.79
166	10.90.138.80/28	10.90.138.81 – 10.90.138.94	10.90.138.95
167	10.90.138.96/28	10.90.138.97 – 10.90.138.110	10.90.138.111
168	10.90.138.112/28	10.90.138.113 – 10.90.138.126	10.90.138.127
169	10.90.138.128/28	10.90.138.129 – 10.90.138.142	10.90.138.143
170	10.90.138.144/28	10.90.138.145 – 10.90.138.158	10.90.138.159
171	10.90.138.160/28	10.90.138.161 – 10.90.138.174	10.90.138.175
172	10.90.138.176/28	10.90.138.177 – 10.90.138.190	10.90.138.191
173	10.90.138.192/28	10.90.138.193 – 10.90.138.206	10.90.138.207
174	10.90.138.208/28	10.90.138.209 – 10.90.138.222	10.90.138.223
175	10.90.138.224/28	10.90.138.225 – 10.90.138.238	10.90.138.239
176	10.90.138.240/28	10.90.138.241 – 10.90.138.254	10.90.138.255
177	10.90.139.0/28	10.90.139.1 – 10.90.139.14	10.90.139.15
178	10.90.139.16/28	10.90.139.17 – 10.90.139.30	10.90.139.31
179	10.90.139.32/28	10.90.139.33 – 10.90.139.46	10.90.139.47
180	10.90.139.48/28	10.90.139.49 – 10.90.139.62	10.90.139.63
181	10.90.139.64/28	10.90.139.65 – 10.90.139.78	10.90.139.79
182	10.90.139.80/28	10.90.139.81 – 10.90.139.94	10.90.139.95
183	10.90.139.96/28	10.90.139.97 – 10.90.139.110	10.90.139.111
184	10.90.139.112/28	10.90.139.113 – 10.90.139.126	10.90.139.127
185	10.90.139.128/28	10.90.139.129 – 10.90.139.142	10.90.139.143
186	10.90.139.144/28	10.90.139.145 – 10.90.139.158	10.90.139.159
187	10.90.139.160/28	10.90.139.161 – 10.90.139.174	10.90.139.175
188	10.90.139.176/28	10.90.139.177 – 10.90.139.190	10.90.139.191
189	10.90.139.192/28	10.90.139.193 – 10.90.139.206	10.90.139.207
190	10.90.139.208/28	10.90.139.209 – 10.90.139.222	10.90.139.223
191	10.90.139.224/28	10.90.139.225 – 10.90.139.238	10.90.139.239
192	10.90.139.240/28	10.90.139.241 – 10.90.139.254	10.90.139.255
193	10.90.140.0/28	10.90.140.1 – 10.90.140.14	10.90.140.15
194	10.90.140.16/28	10.90.140.17 – 10.90.140.30	10.90.140.31
195	10.90.140.32/28	10.90.140.33 – 10.90.140.46	10.90.140.47
196	10.90.140.48/28	10.90.140.49 – 10.90.140.62	10.90.140.63
197	10.90.140.64/28	10.90.140.65 – 10.90.140.78	10.90.140.79
198	10.90.140.80/28	10.90.140.81 – 10.90.140.94	10.90.140.95
199	10.90.140.96/28	10.90.140.97 – 10.90.140.110	10.90.140.111
200	10.90.140.112/28	10.90.140.113 – 10.90.140.126	10.90.140.127
201	10.90.140.128/28	10.90.140.129 – 10.90.140.142	10.90.140.143
202	10.90.140.144/28	10.90.140.145 – 10.90.140.158	10.90.140.159
203	10.90.140.160/28	10.90.140.161 – 10.90.140.174	10.90.140.175
204	10.90.140.176/28	10.90.140.177 – 10.90.140.190	10.90.140.191
205	10.90.140.192/28	10.90.140.193 – 10.90.140.206	10.90.140.207
206	10.90.140.208/28	10.90.140.209 – 10.90.140.222	10.90.140.223
207	10.90.140.224/28	10.90.140.225 – 10.90.140.238	10.90.140.239
208	10.90.140.240/28	10.90.140.241 – 10.90.140.254	10.90.140.255
209	10.90.141.0/28	10.90.141.1 – 10.90.141.14	10.90.141.15
210	10.90.141.16/28	10.90.141.17 – 10.90.141.30	10.90.141.31
211	10.90.141.32/28	10.90.141.33 – 10.90.141.46	10.90.141.47
212	10.90.141.48/28	10.90.141.49 – 10.90.141.62	10.90.141.63
213	10.90.141.64/28	10.90.141.65 – 10.90.141.78	10.90.141.79
214	10.90.141.80/28	10.90.141.81 – 10.90.141.94	10.90.141.95
215	10.90.141.96/28	10.90.141.97 – 10.90.141.110	10.90.141.111
216	10.90.141.112/28	10.90.141.113 – 10.90.141.126	10.90.141.127
217	10.90.141.128/28	10.90.141.129 – 10.90.141.142	10.90.141.143
218	10.90.141.144/28	10.90.141.145 – 10.90.141.158	10.90.141.159
219	10.90.141.160/28	10.90.141.161 – 10.90.141.174	10.90.141.175
220	10.90.141.176/28	10.90.141.177 – 10.90.141.190	10.90.141.191
221	10.90.141.192/28	10.90.141.193 – 10.90.141.206	10.90.141.207
222	10.90.141.208/28	10.90.141.209 – 10.90.141.222	10.90.141.223
223	10.90.141.224/28	10.90.141.225 – 10.90.141.238	10.90.141.239
224	10.90.141.240/28	10.90.141.241 – 10.90.141.254	10.90.141.255
225	10.90.142.0/28	10.90.142.1 – 10.90.142.14	10.90.142.15
226	10.90.142.16/28	10.90.142.17 – 10.90.142.30	10.90.142.31
227	10.90.142.32/28	10.90.142.33 – 10.90.142.46	10.90.142.47
228	10.90.142.48/28	10.90.142.49 – 10.90.142.62	10.90.142.63
229	10.90.142.64/28	10.90.142.65 – 10.90.142.78	10.90.142.79
230	10.90.142.80/28	10.90.142.81 – 10.90.142.94	10.90.142.95
231	10.90.142.96/28	10.90.142.97 – 10.90.142.110	10.90.142.111
232	10.90.142.112/28	10.90.142.113 – 10.90.142.126	10.90.142.127
233	10.90.142.128/28	10.90.142.129 – 10.90.142.142	10.90.142.143
234	10.90.142.144/28	10.90.142.145 – 10.90.142.158	10.90.142.159
235	10.90.142.160/28	10.90.142.161 – 10.90.142.174	10.90.142.175
236	10.90.142.176/28	10.90.142.177 – 10.90.142.190	10.90.142.191
237	10.90.142.192/28	10.90.142.193 – 10.90.142.206	10.90.142.207
238	10.90.142.208/28	10.90.142.209 – 10.90.142.222	10.90.142.223
239	10.90.142.224/28	10.90.142.225 – 10.90.142.238	10.90.142.239
240	10.90.142.240/28	10.90.142.241 – 10.90.142.254	10.90.142.255
241	10.90.143.0/28	10.90.143.1 – 10.90.143.14	10.90.143.15
242	10.90.143.16/28	10.90.143.17 – 10.90.143.30	10.90.143.31
243	10.90.143.32/28	10.90.143.33 – 10.90.143.46	10.90.143.47
244	10.90.143.48/28	10.90.143.49 – 10.90.143.62	10.90.143.63
245	10.90.143.64/28	10.90.143.65 – 10.90.143.78	10.90.143.79
246	10.90.143.80/28	10.90.143.81 – 10.90.143.94	10.90.143.95
247	10.90.143.96/28	10.90.143.97 – 10.90.143.110	10.90.143.111
248	10.90.143.112/28	10.90.143.113 – 10.90.143.126	10.90.143.127
249	10.90.143.128/28	10.90.143.129 – 10.90.143.142	10.90.143.143
250	10.90.143.144/28	10.90.143.145 – 10.90.143.158	10.90.143.159
251	10.90.143.160/28	10.90.143.161 – 10.90.143.174	10.90.143.175
252	10.90.143.176/28	10.90.143.177 – 10.90.143.190	10.90.143.191
253	10.90.143.192/28	10.90.143.193 – 10.90.143.206	10.90.143.207
254	10.90.143.208/28	10.90.143.209 – 10.90.143.222	10.90.143.223
255	10.90.143.224/28	10.90.143.225 – 10.90.143.238	10.90.143.239
256	10.90.143.240/28	10.90.143.241 – 10.90.143.254	10.90.143.255

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 →