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)10.42.128.0/18

network10.42.128.0/18

broadcast10.42.191.255

first host10.42.128.1

last host10.42.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.42.128.0/18

address00001010.00101010.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101010.10000000.00000000

broadcast00001010.00101010.10111111.11111111

green = network part, grey = host part

hex0x0a2a8000

decimal170557440

reverse dns0.128.42.10.in-addr.arpa

ipv4-mapped::ffff:a2a:8000

/18 split into /28 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.42.128.0/28	10.42.128.1 – 10.42.128.14	10.42.128.15
2	10.42.128.16/28	10.42.128.17 – 10.42.128.30	10.42.128.31
3	10.42.128.32/28	10.42.128.33 – 10.42.128.46	10.42.128.47
4	10.42.128.48/28	10.42.128.49 – 10.42.128.62	10.42.128.63
5	10.42.128.64/28	10.42.128.65 – 10.42.128.78	10.42.128.79
6	10.42.128.80/28	10.42.128.81 – 10.42.128.94	10.42.128.95
7	10.42.128.96/28	10.42.128.97 – 10.42.128.110	10.42.128.111
8	10.42.128.112/28	10.42.128.113 – 10.42.128.126	10.42.128.127
9	10.42.128.128/28	10.42.128.129 – 10.42.128.142	10.42.128.143
10	10.42.128.144/28	10.42.128.145 – 10.42.128.158	10.42.128.159
11	10.42.128.160/28	10.42.128.161 – 10.42.128.174	10.42.128.175
12	10.42.128.176/28	10.42.128.177 – 10.42.128.190	10.42.128.191
13	10.42.128.192/28	10.42.128.193 – 10.42.128.206	10.42.128.207
14	10.42.128.208/28	10.42.128.209 – 10.42.128.222	10.42.128.223
15	10.42.128.224/28	10.42.128.225 – 10.42.128.238	10.42.128.239
16	10.42.128.240/28	10.42.128.241 – 10.42.128.254	10.42.128.255
17	10.42.129.0/28	10.42.129.1 – 10.42.129.14	10.42.129.15
18	10.42.129.16/28	10.42.129.17 – 10.42.129.30	10.42.129.31
19	10.42.129.32/28	10.42.129.33 – 10.42.129.46	10.42.129.47
20	10.42.129.48/28	10.42.129.49 – 10.42.129.62	10.42.129.63
21	10.42.129.64/28	10.42.129.65 – 10.42.129.78	10.42.129.79
22	10.42.129.80/28	10.42.129.81 – 10.42.129.94	10.42.129.95
23	10.42.129.96/28	10.42.129.97 – 10.42.129.110	10.42.129.111
24	10.42.129.112/28	10.42.129.113 – 10.42.129.126	10.42.129.127
25	10.42.129.128/28	10.42.129.129 – 10.42.129.142	10.42.129.143
26	10.42.129.144/28	10.42.129.145 – 10.42.129.158	10.42.129.159
27	10.42.129.160/28	10.42.129.161 – 10.42.129.174	10.42.129.175
28	10.42.129.176/28	10.42.129.177 – 10.42.129.190	10.42.129.191
29	10.42.129.192/28	10.42.129.193 – 10.42.129.206	10.42.129.207
30	10.42.129.208/28	10.42.129.209 – 10.42.129.222	10.42.129.223
31	10.42.129.224/28	10.42.129.225 – 10.42.129.238	10.42.129.239
32	10.42.129.240/28	10.42.129.241 – 10.42.129.254	10.42.129.255
33	10.42.130.0/28	10.42.130.1 – 10.42.130.14	10.42.130.15
34	10.42.130.16/28	10.42.130.17 – 10.42.130.30	10.42.130.31
35	10.42.130.32/28	10.42.130.33 – 10.42.130.46	10.42.130.47
36	10.42.130.48/28	10.42.130.49 – 10.42.130.62	10.42.130.63
37	10.42.130.64/28	10.42.130.65 – 10.42.130.78	10.42.130.79
38	10.42.130.80/28	10.42.130.81 – 10.42.130.94	10.42.130.95
39	10.42.130.96/28	10.42.130.97 – 10.42.130.110	10.42.130.111
40	10.42.130.112/28	10.42.130.113 – 10.42.130.126	10.42.130.127
41	10.42.130.128/28	10.42.130.129 – 10.42.130.142	10.42.130.143
42	10.42.130.144/28	10.42.130.145 – 10.42.130.158	10.42.130.159
43	10.42.130.160/28	10.42.130.161 – 10.42.130.174	10.42.130.175
44	10.42.130.176/28	10.42.130.177 – 10.42.130.190	10.42.130.191
45	10.42.130.192/28	10.42.130.193 – 10.42.130.206	10.42.130.207
46	10.42.130.208/28	10.42.130.209 – 10.42.130.222	10.42.130.223
47	10.42.130.224/28	10.42.130.225 – 10.42.130.238	10.42.130.239
48	10.42.130.240/28	10.42.130.241 – 10.42.130.254	10.42.130.255
49	10.42.131.0/28	10.42.131.1 – 10.42.131.14	10.42.131.15
50	10.42.131.16/28	10.42.131.17 – 10.42.131.30	10.42.131.31
51	10.42.131.32/28	10.42.131.33 – 10.42.131.46	10.42.131.47
52	10.42.131.48/28	10.42.131.49 – 10.42.131.62	10.42.131.63
53	10.42.131.64/28	10.42.131.65 – 10.42.131.78	10.42.131.79
54	10.42.131.80/28	10.42.131.81 – 10.42.131.94	10.42.131.95
55	10.42.131.96/28	10.42.131.97 – 10.42.131.110	10.42.131.111
56	10.42.131.112/28	10.42.131.113 – 10.42.131.126	10.42.131.127
57	10.42.131.128/28	10.42.131.129 – 10.42.131.142	10.42.131.143
58	10.42.131.144/28	10.42.131.145 – 10.42.131.158	10.42.131.159
59	10.42.131.160/28	10.42.131.161 – 10.42.131.174	10.42.131.175
60	10.42.131.176/28	10.42.131.177 – 10.42.131.190	10.42.131.191
61	10.42.131.192/28	10.42.131.193 – 10.42.131.206	10.42.131.207
62	10.42.131.208/28	10.42.131.209 – 10.42.131.222	10.42.131.223
63	10.42.131.224/28	10.42.131.225 – 10.42.131.238	10.42.131.239
64	10.42.131.240/28	10.42.131.241 – 10.42.131.254	10.42.131.255
65	10.42.132.0/28	10.42.132.1 – 10.42.132.14	10.42.132.15
66	10.42.132.16/28	10.42.132.17 – 10.42.132.30	10.42.132.31
67	10.42.132.32/28	10.42.132.33 – 10.42.132.46	10.42.132.47
68	10.42.132.48/28	10.42.132.49 – 10.42.132.62	10.42.132.63
69	10.42.132.64/28	10.42.132.65 – 10.42.132.78	10.42.132.79
70	10.42.132.80/28	10.42.132.81 – 10.42.132.94	10.42.132.95
71	10.42.132.96/28	10.42.132.97 – 10.42.132.110	10.42.132.111
72	10.42.132.112/28	10.42.132.113 – 10.42.132.126	10.42.132.127
73	10.42.132.128/28	10.42.132.129 – 10.42.132.142	10.42.132.143
74	10.42.132.144/28	10.42.132.145 – 10.42.132.158	10.42.132.159
75	10.42.132.160/28	10.42.132.161 – 10.42.132.174	10.42.132.175
76	10.42.132.176/28	10.42.132.177 – 10.42.132.190	10.42.132.191
77	10.42.132.192/28	10.42.132.193 – 10.42.132.206	10.42.132.207
78	10.42.132.208/28	10.42.132.209 – 10.42.132.222	10.42.132.223
79	10.42.132.224/28	10.42.132.225 – 10.42.132.238	10.42.132.239
80	10.42.132.240/28	10.42.132.241 – 10.42.132.254	10.42.132.255
81	10.42.133.0/28	10.42.133.1 – 10.42.133.14	10.42.133.15
82	10.42.133.16/28	10.42.133.17 – 10.42.133.30	10.42.133.31
83	10.42.133.32/28	10.42.133.33 – 10.42.133.46	10.42.133.47
84	10.42.133.48/28	10.42.133.49 – 10.42.133.62	10.42.133.63
85	10.42.133.64/28	10.42.133.65 – 10.42.133.78	10.42.133.79
86	10.42.133.80/28	10.42.133.81 – 10.42.133.94	10.42.133.95
87	10.42.133.96/28	10.42.133.97 – 10.42.133.110	10.42.133.111
88	10.42.133.112/28	10.42.133.113 – 10.42.133.126	10.42.133.127
89	10.42.133.128/28	10.42.133.129 – 10.42.133.142	10.42.133.143
90	10.42.133.144/28	10.42.133.145 – 10.42.133.158	10.42.133.159
91	10.42.133.160/28	10.42.133.161 – 10.42.133.174	10.42.133.175
92	10.42.133.176/28	10.42.133.177 – 10.42.133.190	10.42.133.191
93	10.42.133.192/28	10.42.133.193 – 10.42.133.206	10.42.133.207
94	10.42.133.208/28	10.42.133.209 – 10.42.133.222	10.42.133.223
95	10.42.133.224/28	10.42.133.225 – 10.42.133.238	10.42.133.239
96	10.42.133.240/28	10.42.133.241 – 10.42.133.254	10.42.133.255
97	10.42.134.0/28	10.42.134.1 – 10.42.134.14	10.42.134.15
98	10.42.134.16/28	10.42.134.17 – 10.42.134.30	10.42.134.31
99	10.42.134.32/28	10.42.134.33 – 10.42.134.46	10.42.134.47
100	10.42.134.48/28	10.42.134.49 – 10.42.134.62	10.42.134.63
101	10.42.134.64/28	10.42.134.65 – 10.42.134.78	10.42.134.79
102	10.42.134.80/28	10.42.134.81 – 10.42.134.94	10.42.134.95
103	10.42.134.96/28	10.42.134.97 – 10.42.134.110	10.42.134.111
104	10.42.134.112/28	10.42.134.113 – 10.42.134.126	10.42.134.127
105	10.42.134.128/28	10.42.134.129 – 10.42.134.142	10.42.134.143
106	10.42.134.144/28	10.42.134.145 – 10.42.134.158	10.42.134.159
107	10.42.134.160/28	10.42.134.161 – 10.42.134.174	10.42.134.175
108	10.42.134.176/28	10.42.134.177 – 10.42.134.190	10.42.134.191
109	10.42.134.192/28	10.42.134.193 – 10.42.134.206	10.42.134.207
110	10.42.134.208/28	10.42.134.209 – 10.42.134.222	10.42.134.223
111	10.42.134.224/28	10.42.134.225 – 10.42.134.238	10.42.134.239
112	10.42.134.240/28	10.42.134.241 – 10.42.134.254	10.42.134.255
113	10.42.135.0/28	10.42.135.1 – 10.42.135.14	10.42.135.15
114	10.42.135.16/28	10.42.135.17 – 10.42.135.30	10.42.135.31
115	10.42.135.32/28	10.42.135.33 – 10.42.135.46	10.42.135.47
116	10.42.135.48/28	10.42.135.49 – 10.42.135.62	10.42.135.63
117	10.42.135.64/28	10.42.135.65 – 10.42.135.78	10.42.135.79
118	10.42.135.80/28	10.42.135.81 – 10.42.135.94	10.42.135.95
119	10.42.135.96/28	10.42.135.97 – 10.42.135.110	10.42.135.111
120	10.42.135.112/28	10.42.135.113 – 10.42.135.126	10.42.135.127
121	10.42.135.128/28	10.42.135.129 – 10.42.135.142	10.42.135.143
122	10.42.135.144/28	10.42.135.145 – 10.42.135.158	10.42.135.159
123	10.42.135.160/28	10.42.135.161 – 10.42.135.174	10.42.135.175
124	10.42.135.176/28	10.42.135.177 – 10.42.135.190	10.42.135.191
125	10.42.135.192/28	10.42.135.193 – 10.42.135.206	10.42.135.207
126	10.42.135.208/28	10.42.135.209 – 10.42.135.222	10.42.135.223
127	10.42.135.224/28	10.42.135.225 – 10.42.135.238	10.42.135.239
128	10.42.135.240/28	10.42.135.241 – 10.42.135.254	10.42.135.255
129	10.42.136.0/28	10.42.136.1 – 10.42.136.14	10.42.136.15
130	10.42.136.16/28	10.42.136.17 – 10.42.136.30	10.42.136.31
131	10.42.136.32/28	10.42.136.33 – 10.42.136.46	10.42.136.47
132	10.42.136.48/28	10.42.136.49 – 10.42.136.62	10.42.136.63
133	10.42.136.64/28	10.42.136.65 – 10.42.136.78	10.42.136.79
134	10.42.136.80/28	10.42.136.81 – 10.42.136.94	10.42.136.95
135	10.42.136.96/28	10.42.136.97 – 10.42.136.110	10.42.136.111
136	10.42.136.112/28	10.42.136.113 – 10.42.136.126	10.42.136.127
137	10.42.136.128/28	10.42.136.129 – 10.42.136.142	10.42.136.143
138	10.42.136.144/28	10.42.136.145 – 10.42.136.158	10.42.136.159
139	10.42.136.160/28	10.42.136.161 – 10.42.136.174	10.42.136.175
140	10.42.136.176/28	10.42.136.177 – 10.42.136.190	10.42.136.191
141	10.42.136.192/28	10.42.136.193 – 10.42.136.206	10.42.136.207
142	10.42.136.208/28	10.42.136.209 – 10.42.136.222	10.42.136.223
143	10.42.136.224/28	10.42.136.225 – 10.42.136.238	10.42.136.239
144	10.42.136.240/28	10.42.136.241 – 10.42.136.254	10.42.136.255
145	10.42.137.0/28	10.42.137.1 – 10.42.137.14	10.42.137.15
146	10.42.137.16/28	10.42.137.17 – 10.42.137.30	10.42.137.31
147	10.42.137.32/28	10.42.137.33 – 10.42.137.46	10.42.137.47
148	10.42.137.48/28	10.42.137.49 – 10.42.137.62	10.42.137.63
149	10.42.137.64/28	10.42.137.65 – 10.42.137.78	10.42.137.79
150	10.42.137.80/28	10.42.137.81 – 10.42.137.94	10.42.137.95
151	10.42.137.96/28	10.42.137.97 – 10.42.137.110	10.42.137.111
152	10.42.137.112/28	10.42.137.113 – 10.42.137.126	10.42.137.127
153	10.42.137.128/28	10.42.137.129 – 10.42.137.142	10.42.137.143
154	10.42.137.144/28	10.42.137.145 – 10.42.137.158	10.42.137.159
155	10.42.137.160/28	10.42.137.161 – 10.42.137.174	10.42.137.175
156	10.42.137.176/28	10.42.137.177 – 10.42.137.190	10.42.137.191
157	10.42.137.192/28	10.42.137.193 – 10.42.137.206	10.42.137.207
158	10.42.137.208/28	10.42.137.209 – 10.42.137.222	10.42.137.223
159	10.42.137.224/28	10.42.137.225 – 10.42.137.238	10.42.137.239
160	10.42.137.240/28	10.42.137.241 – 10.42.137.254	10.42.137.255
161	10.42.138.0/28	10.42.138.1 – 10.42.138.14	10.42.138.15
162	10.42.138.16/28	10.42.138.17 – 10.42.138.30	10.42.138.31
163	10.42.138.32/28	10.42.138.33 – 10.42.138.46	10.42.138.47
164	10.42.138.48/28	10.42.138.49 – 10.42.138.62	10.42.138.63
165	10.42.138.64/28	10.42.138.65 – 10.42.138.78	10.42.138.79
166	10.42.138.80/28	10.42.138.81 – 10.42.138.94	10.42.138.95
167	10.42.138.96/28	10.42.138.97 – 10.42.138.110	10.42.138.111
168	10.42.138.112/28	10.42.138.113 – 10.42.138.126	10.42.138.127
169	10.42.138.128/28	10.42.138.129 – 10.42.138.142	10.42.138.143
170	10.42.138.144/28	10.42.138.145 – 10.42.138.158	10.42.138.159
171	10.42.138.160/28	10.42.138.161 – 10.42.138.174	10.42.138.175
172	10.42.138.176/28	10.42.138.177 – 10.42.138.190	10.42.138.191
173	10.42.138.192/28	10.42.138.193 – 10.42.138.206	10.42.138.207
174	10.42.138.208/28	10.42.138.209 – 10.42.138.222	10.42.138.223
175	10.42.138.224/28	10.42.138.225 – 10.42.138.238	10.42.138.239
176	10.42.138.240/28	10.42.138.241 – 10.42.138.254	10.42.138.255
177	10.42.139.0/28	10.42.139.1 – 10.42.139.14	10.42.139.15
178	10.42.139.16/28	10.42.139.17 – 10.42.139.30	10.42.139.31
179	10.42.139.32/28	10.42.139.33 – 10.42.139.46	10.42.139.47
180	10.42.139.48/28	10.42.139.49 – 10.42.139.62	10.42.139.63
181	10.42.139.64/28	10.42.139.65 – 10.42.139.78	10.42.139.79
182	10.42.139.80/28	10.42.139.81 – 10.42.139.94	10.42.139.95
183	10.42.139.96/28	10.42.139.97 – 10.42.139.110	10.42.139.111
184	10.42.139.112/28	10.42.139.113 – 10.42.139.126	10.42.139.127
185	10.42.139.128/28	10.42.139.129 – 10.42.139.142	10.42.139.143
186	10.42.139.144/28	10.42.139.145 – 10.42.139.158	10.42.139.159
187	10.42.139.160/28	10.42.139.161 – 10.42.139.174	10.42.139.175
188	10.42.139.176/28	10.42.139.177 – 10.42.139.190	10.42.139.191
189	10.42.139.192/28	10.42.139.193 – 10.42.139.206	10.42.139.207
190	10.42.139.208/28	10.42.139.209 – 10.42.139.222	10.42.139.223
191	10.42.139.224/28	10.42.139.225 – 10.42.139.238	10.42.139.239
192	10.42.139.240/28	10.42.139.241 – 10.42.139.254	10.42.139.255
193	10.42.140.0/28	10.42.140.1 – 10.42.140.14	10.42.140.15
194	10.42.140.16/28	10.42.140.17 – 10.42.140.30	10.42.140.31
195	10.42.140.32/28	10.42.140.33 – 10.42.140.46	10.42.140.47
196	10.42.140.48/28	10.42.140.49 – 10.42.140.62	10.42.140.63
197	10.42.140.64/28	10.42.140.65 – 10.42.140.78	10.42.140.79
198	10.42.140.80/28	10.42.140.81 – 10.42.140.94	10.42.140.95
199	10.42.140.96/28	10.42.140.97 – 10.42.140.110	10.42.140.111
200	10.42.140.112/28	10.42.140.113 – 10.42.140.126	10.42.140.127
201	10.42.140.128/28	10.42.140.129 – 10.42.140.142	10.42.140.143
202	10.42.140.144/28	10.42.140.145 – 10.42.140.158	10.42.140.159
203	10.42.140.160/28	10.42.140.161 – 10.42.140.174	10.42.140.175
204	10.42.140.176/28	10.42.140.177 – 10.42.140.190	10.42.140.191
205	10.42.140.192/28	10.42.140.193 – 10.42.140.206	10.42.140.207
206	10.42.140.208/28	10.42.140.209 – 10.42.140.222	10.42.140.223
207	10.42.140.224/28	10.42.140.225 – 10.42.140.238	10.42.140.239
208	10.42.140.240/28	10.42.140.241 – 10.42.140.254	10.42.140.255
209	10.42.141.0/28	10.42.141.1 – 10.42.141.14	10.42.141.15
210	10.42.141.16/28	10.42.141.17 – 10.42.141.30	10.42.141.31
211	10.42.141.32/28	10.42.141.33 – 10.42.141.46	10.42.141.47
212	10.42.141.48/28	10.42.141.49 – 10.42.141.62	10.42.141.63
213	10.42.141.64/28	10.42.141.65 – 10.42.141.78	10.42.141.79
214	10.42.141.80/28	10.42.141.81 – 10.42.141.94	10.42.141.95
215	10.42.141.96/28	10.42.141.97 – 10.42.141.110	10.42.141.111
216	10.42.141.112/28	10.42.141.113 – 10.42.141.126	10.42.141.127
217	10.42.141.128/28	10.42.141.129 – 10.42.141.142	10.42.141.143
218	10.42.141.144/28	10.42.141.145 – 10.42.141.158	10.42.141.159
219	10.42.141.160/28	10.42.141.161 – 10.42.141.174	10.42.141.175
220	10.42.141.176/28	10.42.141.177 – 10.42.141.190	10.42.141.191
221	10.42.141.192/28	10.42.141.193 – 10.42.141.206	10.42.141.207
222	10.42.141.208/28	10.42.141.209 – 10.42.141.222	10.42.141.223
223	10.42.141.224/28	10.42.141.225 – 10.42.141.238	10.42.141.239
224	10.42.141.240/28	10.42.141.241 – 10.42.141.254	10.42.141.255
225	10.42.142.0/28	10.42.142.1 – 10.42.142.14	10.42.142.15
226	10.42.142.16/28	10.42.142.17 – 10.42.142.30	10.42.142.31
227	10.42.142.32/28	10.42.142.33 – 10.42.142.46	10.42.142.47
228	10.42.142.48/28	10.42.142.49 – 10.42.142.62	10.42.142.63
229	10.42.142.64/28	10.42.142.65 – 10.42.142.78	10.42.142.79
230	10.42.142.80/28	10.42.142.81 – 10.42.142.94	10.42.142.95
231	10.42.142.96/28	10.42.142.97 – 10.42.142.110	10.42.142.111
232	10.42.142.112/28	10.42.142.113 – 10.42.142.126	10.42.142.127
233	10.42.142.128/28	10.42.142.129 – 10.42.142.142	10.42.142.143
234	10.42.142.144/28	10.42.142.145 – 10.42.142.158	10.42.142.159
235	10.42.142.160/28	10.42.142.161 – 10.42.142.174	10.42.142.175
236	10.42.142.176/28	10.42.142.177 – 10.42.142.190	10.42.142.191
237	10.42.142.192/28	10.42.142.193 – 10.42.142.206	10.42.142.207
238	10.42.142.208/28	10.42.142.209 – 10.42.142.222	10.42.142.223
239	10.42.142.224/28	10.42.142.225 – 10.42.142.238	10.42.142.239
240	10.42.142.240/28	10.42.142.241 – 10.42.142.254	10.42.142.255
241	10.42.143.0/28	10.42.143.1 – 10.42.143.14	10.42.143.15
242	10.42.143.16/28	10.42.143.17 – 10.42.143.30	10.42.143.31
243	10.42.143.32/28	10.42.143.33 – 10.42.143.46	10.42.143.47
244	10.42.143.48/28	10.42.143.49 – 10.42.143.62	10.42.143.63
245	10.42.143.64/28	10.42.143.65 – 10.42.143.78	10.42.143.79
246	10.42.143.80/28	10.42.143.81 – 10.42.143.94	10.42.143.95
247	10.42.143.96/28	10.42.143.97 – 10.42.143.110	10.42.143.111
248	10.42.143.112/28	10.42.143.113 – 10.42.143.126	10.42.143.127
249	10.42.143.128/28	10.42.143.129 – 10.42.143.142	10.42.143.143
250	10.42.143.144/28	10.42.143.145 – 10.42.143.158	10.42.143.159
251	10.42.143.160/28	10.42.143.161 – 10.42.143.174	10.42.143.175
252	10.42.143.176/28	10.42.143.177 – 10.42.143.190	10.42.143.191
253	10.42.143.192/28	10.42.143.193 – 10.42.143.206	10.42.143.207
254	10.42.143.208/28	10.42.143.209 – 10.42.143.222	10.42.143.223
255	10.42.143.224/28	10.42.143.225 – 10.42.143.238	10.42.143.239
256	10.42.143.240/28	10.42.143.241 – 10.42.143.254	10.42.143.255

showing 256 of 1,024

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