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)10.20.0.0/18

network10.20.0.0/18

broadcast10.20.63.255

first host10.20.0.1

last host10.20.63.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.20.0.0/18

address00001010.00010100.00000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00010100.00000000.00000000

broadcast00001010.00010100.00111111.11111111

green = network part, grey = host part

hex0x0a140000

decimal169082880

reverse dns0.0.20.10.in-addr.arpa

ipv4-mapped::ffff:a14:0

/18 split into /28 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.20.0.0/28	10.20.0.1 – 10.20.0.14	10.20.0.15
2	10.20.0.16/28	10.20.0.17 – 10.20.0.30	10.20.0.31
3	10.20.0.32/28	10.20.0.33 – 10.20.0.46	10.20.0.47
4	10.20.0.48/28	10.20.0.49 – 10.20.0.62	10.20.0.63
5	10.20.0.64/28	10.20.0.65 – 10.20.0.78	10.20.0.79
6	10.20.0.80/28	10.20.0.81 – 10.20.0.94	10.20.0.95
7	10.20.0.96/28	10.20.0.97 – 10.20.0.110	10.20.0.111
8	10.20.0.112/28	10.20.0.113 – 10.20.0.126	10.20.0.127
9	10.20.0.128/28	10.20.0.129 – 10.20.0.142	10.20.0.143
10	10.20.0.144/28	10.20.0.145 – 10.20.0.158	10.20.0.159
11	10.20.0.160/28	10.20.0.161 – 10.20.0.174	10.20.0.175
12	10.20.0.176/28	10.20.0.177 – 10.20.0.190	10.20.0.191
13	10.20.0.192/28	10.20.0.193 – 10.20.0.206	10.20.0.207
14	10.20.0.208/28	10.20.0.209 – 10.20.0.222	10.20.0.223
15	10.20.0.224/28	10.20.0.225 – 10.20.0.238	10.20.0.239
16	10.20.0.240/28	10.20.0.241 – 10.20.0.254	10.20.0.255
17	10.20.1.0/28	10.20.1.1 – 10.20.1.14	10.20.1.15
18	10.20.1.16/28	10.20.1.17 – 10.20.1.30	10.20.1.31
19	10.20.1.32/28	10.20.1.33 – 10.20.1.46	10.20.1.47
20	10.20.1.48/28	10.20.1.49 – 10.20.1.62	10.20.1.63
21	10.20.1.64/28	10.20.1.65 – 10.20.1.78	10.20.1.79
22	10.20.1.80/28	10.20.1.81 – 10.20.1.94	10.20.1.95
23	10.20.1.96/28	10.20.1.97 – 10.20.1.110	10.20.1.111
24	10.20.1.112/28	10.20.1.113 – 10.20.1.126	10.20.1.127
25	10.20.1.128/28	10.20.1.129 – 10.20.1.142	10.20.1.143
26	10.20.1.144/28	10.20.1.145 – 10.20.1.158	10.20.1.159
27	10.20.1.160/28	10.20.1.161 – 10.20.1.174	10.20.1.175
28	10.20.1.176/28	10.20.1.177 – 10.20.1.190	10.20.1.191
29	10.20.1.192/28	10.20.1.193 – 10.20.1.206	10.20.1.207
30	10.20.1.208/28	10.20.1.209 – 10.20.1.222	10.20.1.223
31	10.20.1.224/28	10.20.1.225 – 10.20.1.238	10.20.1.239
32	10.20.1.240/28	10.20.1.241 – 10.20.1.254	10.20.1.255
33	10.20.2.0/28	10.20.2.1 – 10.20.2.14	10.20.2.15
34	10.20.2.16/28	10.20.2.17 – 10.20.2.30	10.20.2.31
35	10.20.2.32/28	10.20.2.33 – 10.20.2.46	10.20.2.47
36	10.20.2.48/28	10.20.2.49 – 10.20.2.62	10.20.2.63
37	10.20.2.64/28	10.20.2.65 – 10.20.2.78	10.20.2.79
38	10.20.2.80/28	10.20.2.81 – 10.20.2.94	10.20.2.95
39	10.20.2.96/28	10.20.2.97 – 10.20.2.110	10.20.2.111
40	10.20.2.112/28	10.20.2.113 – 10.20.2.126	10.20.2.127
41	10.20.2.128/28	10.20.2.129 – 10.20.2.142	10.20.2.143
42	10.20.2.144/28	10.20.2.145 – 10.20.2.158	10.20.2.159
43	10.20.2.160/28	10.20.2.161 – 10.20.2.174	10.20.2.175
44	10.20.2.176/28	10.20.2.177 – 10.20.2.190	10.20.2.191
45	10.20.2.192/28	10.20.2.193 – 10.20.2.206	10.20.2.207
46	10.20.2.208/28	10.20.2.209 – 10.20.2.222	10.20.2.223
47	10.20.2.224/28	10.20.2.225 – 10.20.2.238	10.20.2.239
48	10.20.2.240/28	10.20.2.241 – 10.20.2.254	10.20.2.255
49	10.20.3.0/28	10.20.3.1 – 10.20.3.14	10.20.3.15
50	10.20.3.16/28	10.20.3.17 – 10.20.3.30	10.20.3.31
51	10.20.3.32/28	10.20.3.33 – 10.20.3.46	10.20.3.47
52	10.20.3.48/28	10.20.3.49 – 10.20.3.62	10.20.3.63
53	10.20.3.64/28	10.20.3.65 – 10.20.3.78	10.20.3.79
54	10.20.3.80/28	10.20.3.81 – 10.20.3.94	10.20.3.95
55	10.20.3.96/28	10.20.3.97 – 10.20.3.110	10.20.3.111
56	10.20.3.112/28	10.20.3.113 – 10.20.3.126	10.20.3.127
57	10.20.3.128/28	10.20.3.129 – 10.20.3.142	10.20.3.143
58	10.20.3.144/28	10.20.3.145 – 10.20.3.158	10.20.3.159
59	10.20.3.160/28	10.20.3.161 – 10.20.3.174	10.20.3.175
60	10.20.3.176/28	10.20.3.177 – 10.20.3.190	10.20.3.191
61	10.20.3.192/28	10.20.3.193 – 10.20.3.206	10.20.3.207
62	10.20.3.208/28	10.20.3.209 – 10.20.3.222	10.20.3.223
63	10.20.3.224/28	10.20.3.225 – 10.20.3.238	10.20.3.239
64	10.20.3.240/28	10.20.3.241 – 10.20.3.254	10.20.3.255
65	10.20.4.0/28	10.20.4.1 – 10.20.4.14	10.20.4.15
66	10.20.4.16/28	10.20.4.17 – 10.20.4.30	10.20.4.31
67	10.20.4.32/28	10.20.4.33 – 10.20.4.46	10.20.4.47
68	10.20.4.48/28	10.20.4.49 – 10.20.4.62	10.20.4.63
69	10.20.4.64/28	10.20.4.65 – 10.20.4.78	10.20.4.79
70	10.20.4.80/28	10.20.4.81 – 10.20.4.94	10.20.4.95
71	10.20.4.96/28	10.20.4.97 – 10.20.4.110	10.20.4.111
72	10.20.4.112/28	10.20.4.113 – 10.20.4.126	10.20.4.127
73	10.20.4.128/28	10.20.4.129 – 10.20.4.142	10.20.4.143
74	10.20.4.144/28	10.20.4.145 – 10.20.4.158	10.20.4.159
75	10.20.4.160/28	10.20.4.161 – 10.20.4.174	10.20.4.175
76	10.20.4.176/28	10.20.4.177 – 10.20.4.190	10.20.4.191
77	10.20.4.192/28	10.20.4.193 – 10.20.4.206	10.20.4.207
78	10.20.4.208/28	10.20.4.209 – 10.20.4.222	10.20.4.223
79	10.20.4.224/28	10.20.4.225 – 10.20.4.238	10.20.4.239
80	10.20.4.240/28	10.20.4.241 – 10.20.4.254	10.20.4.255
81	10.20.5.0/28	10.20.5.1 – 10.20.5.14	10.20.5.15
82	10.20.5.16/28	10.20.5.17 – 10.20.5.30	10.20.5.31
83	10.20.5.32/28	10.20.5.33 – 10.20.5.46	10.20.5.47
84	10.20.5.48/28	10.20.5.49 – 10.20.5.62	10.20.5.63
85	10.20.5.64/28	10.20.5.65 – 10.20.5.78	10.20.5.79
86	10.20.5.80/28	10.20.5.81 – 10.20.5.94	10.20.5.95
87	10.20.5.96/28	10.20.5.97 – 10.20.5.110	10.20.5.111
88	10.20.5.112/28	10.20.5.113 – 10.20.5.126	10.20.5.127
89	10.20.5.128/28	10.20.5.129 – 10.20.5.142	10.20.5.143
90	10.20.5.144/28	10.20.5.145 – 10.20.5.158	10.20.5.159
91	10.20.5.160/28	10.20.5.161 – 10.20.5.174	10.20.5.175
92	10.20.5.176/28	10.20.5.177 – 10.20.5.190	10.20.5.191
93	10.20.5.192/28	10.20.5.193 – 10.20.5.206	10.20.5.207
94	10.20.5.208/28	10.20.5.209 – 10.20.5.222	10.20.5.223
95	10.20.5.224/28	10.20.5.225 – 10.20.5.238	10.20.5.239
96	10.20.5.240/28	10.20.5.241 – 10.20.5.254	10.20.5.255
97	10.20.6.0/28	10.20.6.1 – 10.20.6.14	10.20.6.15
98	10.20.6.16/28	10.20.6.17 – 10.20.6.30	10.20.6.31
99	10.20.6.32/28	10.20.6.33 – 10.20.6.46	10.20.6.47
100	10.20.6.48/28	10.20.6.49 – 10.20.6.62	10.20.6.63
101	10.20.6.64/28	10.20.6.65 – 10.20.6.78	10.20.6.79
102	10.20.6.80/28	10.20.6.81 – 10.20.6.94	10.20.6.95
103	10.20.6.96/28	10.20.6.97 – 10.20.6.110	10.20.6.111
104	10.20.6.112/28	10.20.6.113 – 10.20.6.126	10.20.6.127
105	10.20.6.128/28	10.20.6.129 – 10.20.6.142	10.20.6.143
106	10.20.6.144/28	10.20.6.145 – 10.20.6.158	10.20.6.159
107	10.20.6.160/28	10.20.6.161 – 10.20.6.174	10.20.6.175
108	10.20.6.176/28	10.20.6.177 – 10.20.6.190	10.20.6.191
109	10.20.6.192/28	10.20.6.193 – 10.20.6.206	10.20.6.207
110	10.20.6.208/28	10.20.6.209 – 10.20.6.222	10.20.6.223
111	10.20.6.224/28	10.20.6.225 – 10.20.6.238	10.20.6.239
112	10.20.6.240/28	10.20.6.241 – 10.20.6.254	10.20.6.255
113	10.20.7.0/28	10.20.7.1 – 10.20.7.14	10.20.7.15
114	10.20.7.16/28	10.20.7.17 – 10.20.7.30	10.20.7.31
115	10.20.7.32/28	10.20.7.33 – 10.20.7.46	10.20.7.47
116	10.20.7.48/28	10.20.7.49 – 10.20.7.62	10.20.7.63
117	10.20.7.64/28	10.20.7.65 – 10.20.7.78	10.20.7.79
118	10.20.7.80/28	10.20.7.81 – 10.20.7.94	10.20.7.95
119	10.20.7.96/28	10.20.7.97 – 10.20.7.110	10.20.7.111
120	10.20.7.112/28	10.20.7.113 – 10.20.7.126	10.20.7.127
121	10.20.7.128/28	10.20.7.129 – 10.20.7.142	10.20.7.143
122	10.20.7.144/28	10.20.7.145 – 10.20.7.158	10.20.7.159
123	10.20.7.160/28	10.20.7.161 – 10.20.7.174	10.20.7.175
124	10.20.7.176/28	10.20.7.177 – 10.20.7.190	10.20.7.191
125	10.20.7.192/28	10.20.7.193 – 10.20.7.206	10.20.7.207
126	10.20.7.208/28	10.20.7.209 – 10.20.7.222	10.20.7.223
127	10.20.7.224/28	10.20.7.225 – 10.20.7.238	10.20.7.239
128	10.20.7.240/28	10.20.7.241 – 10.20.7.254	10.20.7.255
129	10.20.8.0/28	10.20.8.1 – 10.20.8.14	10.20.8.15
130	10.20.8.16/28	10.20.8.17 – 10.20.8.30	10.20.8.31
131	10.20.8.32/28	10.20.8.33 – 10.20.8.46	10.20.8.47
132	10.20.8.48/28	10.20.8.49 – 10.20.8.62	10.20.8.63
133	10.20.8.64/28	10.20.8.65 – 10.20.8.78	10.20.8.79
134	10.20.8.80/28	10.20.8.81 – 10.20.8.94	10.20.8.95
135	10.20.8.96/28	10.20.8.97 – 10.20.8.110	10.20.8.111
136	10.20.8.112/28	10.20.8.113 – 10.20.8.126	10.20.8.127
137	10.20.8.128/28	10.20.8.129 – 10.20.8.142	10.20.8.143
138	10.20.8.144/28	10.20.8.145 – 10.20.8.158	10.20.8.159
139	10.20.8.160/28	10.20.8.161 – 10.20.8.174	10.20.8.175
140	10.20.8.176/28	10.20.8.177 – 10.20.8.190	10.20.8.191
141	10.20.8.192/28	10.20.8.193 – 10.20.8.206	10.20.8.207
142	10.20.8.208/28	10.20.8.209 – 10.20.8.222	10.20.8.223
143	10.20.8.224/28	10.20.8.225 – 10.20.8.238	10.20.8.239
144	10.20.8.240/28	10.20.8.241 – 10.20.8.254	10.20.8.255
145	10.20.9.0/28	10.20.9.1 – 10.20.9.14	10.20.9.15
146	10.20.9.16/28	10.20.9.17 – 10.20.9.30	10.20.9.31
147	10.20.9.32/28	10.20.9.33 – 10.20.9.46	10.20.9.47
148	10.20.9.48/28	10.20.9.49 – 10.20.9.62	10.20.9.63
149	10.20.9.64/28	10.20.9.65 – 10.20.9.78	10.20.9.79
150	10.20.9.80/28	10.20.9.81 – 10.20.9.94	10.20.9.95
151	10.20.9.96/28	10.20.9.97 – 10.20.9.110	10.20.9.111
152	10.20.9.112/28	10.20.9.113 – 10.20.9.126	10.20.9.127
153	10.20.9.128/28	10.20.9.129 – 10.20.9.142	10.20.9.143
154	10.20.9.144/28	10.20.9.145 – 10.20.9.158	10.20.9.159
155	10.20.9.160/28	10.20.9.161 – 10.20.9.174	10.20.9.175
156	10.20.9.176/28	10.20.9.177 – 10.20.9.190	10.20.9.191
157	10.20.9.192/28	10.20.9.193 – 10.20.9.206	10.20.9.207
158	10.20.9.208/28	10.20.9.209 – 10.20.9.222	10.20.9.223
159	10.20.9.224/28	10.20.9.225 – 10.20.9.238	10.20.9.239
160	10.20.9.240/28	10.20.9.241 – 10.20.9.254	10.20.9.255
161	10.20.10.0/28	10.20.10.1 – 10.20.10.14	10.20.10.15
162	10.20.10.16/28	10.20.10.17 – 10.20.10.30	10.20.10.31
163	10.20.10.32/28	10.20.10.33 – 10.20.10.46	10.20.10.47
164	10.20.10.48/28	10.20.10.49 – 10.20.10.62	10.20.10.63
165	10.20.10.64/28	10.20.10.65 – 10.20.10.78	10.20.10.79
166	10.20.10.80/28	10.20.10.81 – 10.20.10.94	10.20.10.95
167	10.20.10.96/28	10.20.10.97 – 10.20.10.110	10.20.10.111
168	10.20.10.112/28	10.20.10.113 – 10.20.10.126	10.20.10.127
169	10.20.10.128/28	10.20.10.129 – 10.20.10.142	10.20.10.143
170	10.20.10.144/28	10.20.10.145 – 10.20.10.158	10.20.10.159
171	10.20.10.160/28	10.20.10.161 – 10.20.10.174	10.20.10.175
172	10.20.10.176/28	10.20.10.177 – 10.20.10.190	10.20.10.191
173	10.20.10.192/28	10.20.10.193 – 10.20.10.206	10.20.10.207
174	10.20.10.208/28	10.20.10.209 – 10.20.10.222	10.20.10.223
175	10.20.10.224/28	10.20.10.225 – 10.20.10.238	10.20.10.239
176	10.20.10.240/28	10.20.10.241 – 10.20.10.254	10.20.10.255
177	10.20.11.0/28	10.20.11.1 – 10.20.11.14	10.20.11.15
178	10.20.11.16/28	10.20.11.17 – 10.20.11.30	10.20.11.31
179	10.20.11.32/28	10.20.11.33 – 10.20.11.46	10.20.11.47
180	10.20.11.48/28	10.20.11.49 – 10.20.11.62	10.20.11.63
181	10.20.11.64/28	10.20.11.65 – 10.20.11.78	10.20.11.79
182	10.20.11.80/28	10.20.11.81 – 10.20.11.94	10.20.11.95
183	10.20.11.96/28	10.20.11.97 – 10.20.11.110	10.20.11.111
184	10.20.11.112/28	10.20.11.113 – 10.20.11.126	10.20.11.127
185	10.20.11.128/28	10.20.11.129 – 10.20.11.142	10.20.11.143
186	10.20.11.144/28	10.20.11.145 – 10.20.11.158	10.20.11.159
187	10.20.11.160/28	10.20.11.161 – 10.20.11.174	10.20.11.175
188	10.20.11.176/28	10.20.11.177 – 10.20.11.190	10.20.11.191
189	10.20.11.192/28	10.20.11.193 – 10.20.11.206	10.20.11.207
190	10.20.11.208/28	10.20.11.209 – 10.20.11.222	10.20.11.223
191	10.20.11.224/28	10.20.11.225 – 10.20.11.238	10.20.11.239
192	10.20.11.240/28	10.20.11.241 – 10.20.11.254	10.20.11.255
193	10.20.12.0/28	10.20.12.1 – 10.20.12.14	10.20.12.15
194	10.20.12.16/28	10.20.12.17 – 10.20.12.30	10.20.12.31
195	10.20.12.32/28	10.20.12.33 – 10.20.12.46	10.20.12.47
196	10.20.12.48/28	10.20.12.49 – 10.20.12.62	10.20.12.63
197	10.20.12.64/28	10.20.12.65 – 10.20.12.78	10.20.12.79
198	10.20.12.80/28	10.20.12.81 – 10.20.12.94	10.20.12.95
199	10.20.12.96/28	10.20.12.97 – 10.20.12.110	10.20.12.111
200	10.20.12.112/28	10.20.12.113 – 10.20.12.126	10.20.12.127
201	10.20.12.128/28	10.20.12.129 – 10.20.12.142	10.20.12.143
202	10.20.12.144/28	10.20.12.145 – 10.20.12.158	10.20.12.159
203	10.20.12.160/28	10.20.12.161 – 10.20.12.174	10.20.12.175
204	10.20.12.176/28	10.20.12.177 – 10.20.12.190	10.20.12.191
205	10.20.12.192/28	10.20.12.193 – 10.20.12.206	10.20.12.207
206	10.20.12.208/28	10.20.12.209 – 10.20.12.222	10.20.12.223
207	10.20.12.224/28	10.20.12.225 – 10.20.12.238	10.20.12.239
208	10.20.12.240/28	10.20.12.241 – 10.20.12.254	10.20.12.255
209	10.20.13.0/28	10.20.13.1 – 10.20.13.14	10.20.13.15
210	10.20.13.16/28	10.20.13.17 – 10.20.13.30	10.20.13.31
211	10.20.13.32/28	10.20.13.33 – 10.20.13.46	10.20.13.47
212	10.20.13.48/28	10.20.13.49 – 10.20.13.62	10.20.13.63
213	10.20.13.64/28	10.20.13.65 – 10.20.13.78	10.20.13.79
214	10.20.13.80/28	10.20.13.81 – 10.20.13.94	10.20.13.95
215	10.20.13.96/28	10.20.13.97 – 10.20.13.110	10.20.13.111
216	10.20.13.112/28	10.20.13.113 – 10.20.13.126	10.20.13.127
217	10.20.13.128/28	10.20.13.129 – 10.20.13.142	10.20.13.143
218	10.20.13.144/28	10.20.13.145 – 10.20.13.158	10.20.13.159
219	10.20.13.160/28	10.20.13.161 – 10.20.13.174	10.20.13.175
220	10.20.13.176/28	10.20.13.177 – 10.20.13.190	10.20.13.191
221	10.20.13.192/28	10.20.13.193 – 10.20.13.206	10.20.13.207
222	10.20.13.208/28	10.20.13.209 – 10.20.13.222	10.20.13.223
223	10.20.13.224/28	10.20.13.225 – 10.20.13.238	10.20.13.239
224	10.20.13.240/28	10.20.13.241 – 10.20.13.254	10.20.13.255
225	10.20.14.0/28	10.20.14.1 – 10.20.14.14	10.20.14.15
226	10.20.14.16/28	10.20.14.17 – 10.20.14.30	10.20.14.31
227	10.20.14.32/28	10.20.14.33 – 10.20.14.46	10.20.14.47
228	10.20.14.48/28	10.20.14.49 – 10.20.14.62	10.20.14.63
229	10.20.14.64/28	10.20.14.65 – 10.20.14.78	10.20.14.79
230	10.20.14.80/28	10.20.14.81 – 10.20.14.94	10.20.14.95
231	10.20.14.96/28	10.20.14.97 – 10.20.14.110	10.20.14.111
232	10.20.14.112/28	10.20.14.113 – 10.20.14.126	10.20.14.127
233	10.20.14.128/28	10.20.14.129 – 10.20.14.142	10.20.14.143
234	10.20.14.144/28	10.20.14.145 – 10.20.14.158	10.20.14.159
235	10.20.14.160/28	10.20.14.161 – 10.20.14.174	10.20.14.175
236	10.20.14.176/28	10.20.14.177 – 10.20.14.190	10.20.14.191
237	10.20.14.192/28	10.20.14.193 – 10.20.14.206	10.20.14.207
238	10.20.14.208/28	10.20.14.209 – 10.20.14.222	10.20.14.223
239	10.20.14.224/28	10.20.14.225 – 10.20.14.238	10.20.14.239
240	10.20.14.240/28	10.20.14.241 – 10.20.14.254	10.20.14.255
241	10.20.15.0/28	10.20.15.1 – 10.20.15.14	10.20.15.15
242	10.20.15.16/28	10.20.15.17 – 10.20.15.30	10.20.15.31
243	10.20.15.32/28	10.20.15.33 – 10.20.15.46	10.20.15.47
244	10.20.15.48/28	10.20.15.49 – 10.20.15.62	10.20.15.63
245	10.20.15.64/28	10.20.15.65 – 10.20.15.78	10.20.15.79
246	10.20.15.80/28	10.20.15.81 – 10.20.15.94	10.20.15.95
247	10.20.15.96/28	10.20.15.97 – 10.20.15.110	10.20.15.111
248	10.20.15.112/28	10.20.15.113 – 10.20.15.126	10.20.15.127
249	10.20.15.128/28	10.20.15.129 – 10.20.15.142	10.20.15.143
250	10.20.15.144/28	10.20.15.145 – 10.20.15.158	10.20.15.159
251	10.20.15.160/28	10.20.15.161 – 10.20.15.174	10.20.15.175
252	10.20.15.176/28	10.20.15.177 – 10.20.15.190	10.20.15.191
253	10.20.15.192/28	10.20.15.193 – 10.20.15.206	10.20.15.207
254	10.20.15.208/28	10.20.15.209 – 10.20.15.222	10.20.15.223
255	10.20.15.224/28	10.20.15.225 – 10.20.15.238	10.20.15.239
256	10.20.15.240/28	10.20.15.241 – 10.20.15.254	10.20.15.255

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 →