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)10.4.112.0/20

network10.4.112.0/20

broadcast10.4.127.255

first host10.4.112.1

last host10.4.127.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.4.112.0/20

address00001010.00000100.01110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000100.01110000.00000000

broadcast00001010.00000100.01111111.11111111

green = network part, grey = host part

hex0x0a047000

decimal168062976

reverse dns0.112.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:7000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.4.112.0/28	10.4.112.1 – 10.4.112.14	10.4.112.15
2	10.4.112.16/28	10.4.112.17 – 10.4.112.30	10.4.112.31
3	10.4.112.32/28	10.4.112.33 – 10.4.112.46	10.4.112.47
4	10.4.112.48/28	10.4.112.49 – 10.4.112.62	10.4.112.63
5	10.4.112.64/28	10.4.112.65 – 10.4.112.78	10.4.112.79
6	10.4.112.80/28	10.4.112.81 – 10.4.112.94	10.4.112.95
7	10.4.112.96/28	10.4.112.97 – 10.4.112.110	10.4.112.111
8	10.4.112.112/28	10.4.112.113 – 10.4.112.126	10.4.112.127
9	10.4.112.128/28	10.4.112.129 – 10.4.112.142	10.4.112.143
10	10.4.112.144/28	10.4.112.145 – 10.4.112.158	10.4.112.159
11	10.4.112.160/28	10.4.112.161 – 10.4.112.174	10.4.112.175
12	10.4.112.176/28	10.4.112.177 – 10.4.112.190	10.4.112.191
13	10.4.112.192/28	10.4.112.193 – 10.4.112.206	10.4.112.207
14	10.4.112.208/28	10.4.112.209 – 10.4.112.222	10.4.112.223
15	10.4.112.224/28	10.4.112.225 – 10.4.112.238	10.4.112.239
16	10.4.112.240/28	10.4.112.241 – 10.4.112.254	10.4.112.255
17	10.4.113.0/28	10.4.113.1 – 10.4.113.14	10.4.113.15
18	10.4.113.16/28	10.4.113.17 – 10.4.113.30	10.4.113.31
19	10.4.113.32/28	10.4.113.33 – 10.4.113.46	10.4.113.47
20	10.4.113.48/28	10.4.113.49 – 10.4.113.62	10.4.113.63
21	10.4.113.64/28	10.4.113.65 – 10.4.113.78	10.4.113.79
22	10.4.113.80/28	10.4.113.81 – 10.4.113.94	10.4.113.95
23	10.4.113.96/28	10.4.113.97 – 10.4.113.110	10.4.113.111
24	10.4.113.112/28	10.4.113.113 – 10.4.113.126	10.4.113.127
25	10.4.113.128/28	10.4.113.129 – 10.4.113.142	10.4.113.143
26	10.4.113.144/28	10.4.113.145 – 10.4.113.158	10.4.113.159
27	10.4.113.160/28	10.4.113.161 – 10.4.113.174	10.4.113.175
28	10.4.113.176/28	10.4.113.177 – 10.4.113.190	10.4.113.191
29	10.4.113.192/28	10.4.113.193 – 10.4.113.206	10.4.113.207
30	10.4.113.208/28	10.4.113.209 – 10.4.113.222	10.4.113.223
31	10.4.113.224/28	10.4.113.225 – 10.4.113.238	10.4.113.239
32	10.4.113.240/28	10.4.113.241 – 10.4.113.254	10.4.113.255
33	10.4.114.0/28	10.4.114.1 – 10.4.114.14	10.4.114.15
34	10.4.114.16/28	10.4.114.17 – 10.4.114.30	10.4.114.31
35	10.4.114.32/28	10.4.114.33 – 10.4.114.46	10.4.114.47
36	10.4.114.48/28	10.4.114.49 – 10.4.114.62	10.4.114.63
37	10.4.114.64/28	10.4.114.65 – 10.4.114.78	10.4.114.79
38	10.4.114.80/28	10.4.114.81 – 10.4.114.94	10.4.114.95
39	10.4.114.96/28	10.4.114.97 – 10.4.114.110	10.4.114.111
40	10.4.114.112/28	10.4.114.113 – 10.4.114.126	10.4.114.127
41	10.4.114.128/28	10.4.114.129 – 10.4.114.142	10.4.114.143
42	10.4.114.144/28	10.4.114.145 – 10.4.114.158	10.4.114.159
43	10.4.114.160/28	10.4.114.161 – 10.4.114.174	10.4.114.175
44	10.4.114.176/28	10.4.114.177 – 10.4.114.190	10.4.114.191
45	10.4.114.192/28	10.4.114.193 – 10.4.114.206	10.4.114.207
46	10.4.114.208/28	10.4.114.209 – 10.4.114.222	10.4.114.223
47	10.4.114.224/28	10.4.114.225 – 10.4.114.238	10.4.114.239
48	10.4.114.240/28	10.4.114.241 – 10.4.114.254	10.4.114.255
49	10.4.115.0/28	10.4.115.1 – 10.4.115.14	10.4.115.15
50	10.4.115.16/28	10.4.115.17 – 10.4.115.30	10.4.115.31
51	10.4.115.32/28	10.4.115.33 – 10.4.115.46	10.4.115.47
52	10.4.115.48/28	10.4.115.49 – 10.4.115.62	10.4.115.63
53	10.4.115.64/28	10.4.115.65 – 10.4.115.78	10.4.115.79
54	10.4.115.80/28	10.4.115.81 – 10.4.115.94	10.4.115.95
55	10.4.115.96/28	10.4.115.97 – 10.4.115.110	10.4.115.111
56	10.4.115.112/28	10.4.115.113 – 10.4.115.126	10.4.115.127
57	10.4.115.128/28	10.4.115.129 – 10.4.115.142	10.4.115.143
58	10.4.115.144/28	10.4.115.145 – 10.4.115.158	10.4.115.159
59	10.4.115.160/28	10.4.115.161 – 10.4.115.174	10.4.115.175
60	10.4.115.176/28	10.4.115.177 – 10.4.115.190	10.4.115.191
61	10.4.115.192/28	10.4.115.193 – 10.4.115.206	10.4.115.207
62	10.4.115.208/28	10.4.115.209 – 10.4.115.222	10.4.115.223
63	10.4.115.224/28	10.4.115.225 – 10.4.115.238	10.4.115.239
64	10.4.115.240/28	10.4.115.241 – 10.4.115.254	10.4.115.255
65	10.4.116.0/28	10.4.116.1 – 10.4.116.14	10.4.116.15
66	10.4.116.16/28	10.4.116.17 – 10.4.116.30	10.4.116.31
67	10.4.116.32/28	10.4.116.33 – 10.4.116.46	10.4.116.47
68	10.4.116.48/28	10.4.116.49 – 10.4.116.62	10.4.116.63
69	10.4.116.64/28	10.4.116.65 – 10.4.116.78	10.4.116.79
70	10.4.116.80/28	10.4.116.81 – 10.4.116.94	10.4.116.95
71	10.4.116.96/28	10.4.116.97 – 10.4.116.110	10.4.116.111
72	10.4.116.112/28	10.4.116.113 – 10.4.116.126	10.4.116.127
73	10.4.116.128/28	10.4.116.129 – 10.4.116.142	10.4.116.143
74	10.4.116.144/28	10.4.116.145 – 10.4.116.158	10.4.116.159
75	10.4.116.160/28	10.4.116.161 – 10.4.116.174	10.4.116.175
76	10.4.116.176/28	10.4.116.177 – 10.4.116.190	10.4.116.191
77	10.4.116.192/28	10.4.116.193 – 10.4.116.206	10.4.116.207
78	10.4.116.208/28	10.4.116.209 – 10.4.116.222	10.4.116.223
79	10.4.116.224/28	10.4.116.225 – 10.4.116.238	10.4.116.239
80	10.4.116.240/28	10.4.116.241 – 10.4.116.254	10.4.116.255
81	10.4.117.0/28	10.4.117.1 – 10.4.117.14	10.4.117.15
82	10.4.117.16/28	10.4.117.17 – 10.4.117.30	10.4.117.31
83	10.4.117.32/28	10.4.117.33 – 10.4.117.46	10.4.117.47
84	10.4.117.48/28	10.4.117.49 – 10.4.117.62	10.4.117.63
85	10.4.117.64/28	10.4.117.65 – 10.4.117.78	10.4.117.79
86	10.4.117.80/28	10.4.117.81 – 10.4.117.94	10.4.117.95
87	10.4.117.96/28	10.4.117.97 – 10.4.117.110	10.4.117.111
88	10.4.117.112/28	10.4.117.113 – 10.4.117.126	10.4.117.127
89	10.4.117.128/28	10.4.117.129 – 10.4.117.142	10.4.117.143
90	10.4.117.144/28	10.4.117.145 – 10.4.117.158	10.4.117.159
91	10.4.117.160/28	10.4.117.161 – 10.4.117.174	10.4.117.175
92	10.4.117.176/28	10.4.117.177 – 10.4.117.190	10.4.117.191
93	10.4.117.192/28	10.4.117.193 – 10.4.117.206	10.4.117.207
94	10.4.117.208/28	10.4.117.209 – 10.4.117.222	10.4.117.223
95	10.4.117.224/28	10.4.117.225 – 10.4.117.238	10.4.117.239
96	10.4.117.240/28	10.4.117.241 – 10.4.117.254	10.4.117.255
97	10.4.118.0/28	10.4.118.1 – 10.4.118.14	10.4.118.15
98	10.4.118.16/28	10.4.118.17 – 10.4.118.30	10.4.118.31
99	10.4.118.32/28	10.4.118.33 – 10.4.118.46	10.4.118.47
100	10.4.118.48/28	10.4.118.49 – 10.4.118.62	10.4.118.63
101	10.4.118.64/28	10.4.118.65 – 10.4.118.78	10.4.118.79
102	10.4.118.80/28	10.4.118.81 – 10.4.118.94	10.4.118.95
103	10.4.118.96/28	10.4.118.97 – 10.4.118.110	10.4.118.111
104	10.4.118.112/28	10.4.118.113 – 10.4.118.126	10.4.118.127
105	10.4.118.128/28	10.4.118.129 – 10.4.118.142	10.4.118.143
106	10.4.118.144/28	10.4.118.145 – 10.4.118.158	10.4.118.159
107	10.4.118.160/28	10.4.118.161 – 10.4.118.174	10.4.118.175
108	10.4.118.176/28	10.4.118.177 – 10.4.118.190	10.4.118.191
109	10.4.118.192/28	10.4.118.193 – 10.4.118.206	10.4.118.207
110	10.4.118.208/28	10.4.118.209 – 10.4.118.222	10.4.118.223
111	10.4.118.224/28	10.4.118.225 – 10.4.118.238	10.4.118.239
112	10.4.118.240/28	10.4.118.241 – 10.4.118.254	10.4.118.255
113	10.4.119.0/28	10.4.119.1 – 10.4.119.14	10.4.119.15
114	10.4.119.16/28	10.4.119.17 – 10.4.119.30	10.4.119.31
115	10.4.119.32/28	10.4.119.33 – 10.4.119.46	10.4.119.47
116	10.4.119.48/28	10.4.119.49 – 10.4.119.62	10.4.119.63
117	10.4.119.64/28	10.4.119.65 – 10.4.119.78	10.4.119.79
118	10.4.119.80/28	10.4.119.81 – 10.4.119.94	10.4.119.95
119	10.4.119.96/28	10.4.119.97 – 10.4.119.110	10.4.119.111
120	10.4.119.112/28	10.4.119.113 – 10.4.119.126	10.4.119.127
121	10.4.119.128/28	10.4.119.129 – 10.4.119.142	10.4.119.143
122	10.4.119.144/28	10.4.119.145 – 10.4.119.158	10.4.119.159
123	10.4.119.160/28	10.4.119.161 – 10.4.119.174	10.4.119.175
124	10.4.119.176/28	10.4.119.177 – 10.4.119.190	10.4.119.191
125	10.4.119.192/28	10.4.119.193 – 10.4.119.206	10.4.119.207
126	10.4.119.208/28	10.4.119.209 – 10.4.119.222	10.4.119.223
127	10.4.119.224/28	10.4.119.225 – 10.4.119.238	10.4.119.239
128	10.4.119.240/28	10.4.119.241 – 10.4.119.254	10.4.119.255
129	10.4.120.0/28	10.4.120.1 – 10.4.120.14	10.4.120.15
130	10.4.120.16/28	10.4.120.17 – 10.4.120.30	10.4.120.31
131	10.4.120.32/28	10.4.120.33 – 10.4.120.46	10.4.120.47
132	10.4.120.48/28	10.4.120.49 – 10.4.120.62	10.4.120.63
133	10.4.120.64/28	10.4.120.65 – 10.4.120.78	10.4.120.79
134	10.4.120.80/28	10.4.120.81 – 10.4.120.94	10.4.120.95
135	10.4.120.96/28	10.4.120.97 – 10.4.120.110	10.4.120.111
136	10.4.120.112/28	10.4.120.113 – 10.4.120.126	10.4.120.127
137	10.4.120.128/28	10.4.120.129 – 10.4.120.142	10.4.120.143
138	10.4.120.144/28	10.4.120.145 – 10.4.120.158	10.4.120.159
139	10.4.120.160/28	10.4.120.161 – 10.4.120.174	10.4.120.175
140	10.4.120.176/28	10.4.120.177 – 10.4.120.190	10.4.120.191
141	10.4.120.192/28	10.4.120.193 – 10.4.120.206	10.4.120.207
142	10.4.120.208/28	10.4.120.209 – 10.4.120.222	10.4.120.223
143	10.4.120.224/28	10.4.120.225 – 10.4.120.238	10.4.120.239
144	10.4.120.240/28	10.4.120.241 – 10.4.120.254	10.4.120.255
145	10.4.121.0/28	10.4.121.1 – 10.4.121.14	10.4.121.15
146	10.4.121.16/28	10.4.121.17 – 10.4.121.30	10.4.121.31
147	10.4.121.32/28	10.4.121.33 – 10.4.121.46	10.4.121.47
148	10.4.121.48/28	10.4.121.49 – 10.4.121.62	10.4.121.63
149	10.4.121.64/28	10.4.121.65 – 10.4.121.78	10.4.121.79
150	10.4.121.80/28	10.4.121.81 – 10.4.121.94	10.4.121.95
151	10.4.121.96/28	10.4.121.97 – 10.4.121.110	10.4.121.111
152	10.4.121.112/28	10.4.121.113 – 10.4.121.126	10.4.121.127
153	10.4.121.128/28	10.4.121.129 – 10.4.121.142	10.4.121.143
154	10.4.121.144/28	10.4.121.145 – 10.4.121.158	10.4.121.159
155	10.4.121.160/28	10.4.121.161 – 10.4.121.174	10.4.121.175
156	10.4.121.176/28	10.4.121.177 – 10.4.121.190	10.4.121.191
157	10.4.121.192/28	10.4.121.193 – 10.4.121.206	10.4.121.207
158	10.4.121.208/28	10.4.121.209 – 10.4.121.222	10.4.121.223
159	10.4.121.224/28	10.4.121.225 – 10.4.121.238	10.4.121.239
160	10.4.121.240/28	10.4.121.241 – 10.4.121.254	10.4.121.255
161	10.4.122.0/28	10.4.122.1 – 10.4.122.14	10.4.122.15
162	10.4.122.16/28	10.4.122.17 – 10.4.122.30	10.4.122.31
163	10.4.122.32/28	10.4.122.33 – 10.4.122.46	10.4.122.47
164	10.4.122.48/28	10.4.122.49 – 10.4.122.62	10.4.122.63
165	10.4.122.64/28	10.4.122.65 – 10.4.122.78	10.4.122.79
166	10.4.122.80/28	10.4.122.81 – 10.4.122.94	10.4.122.95
167	10.4.122.96/28	10.4.122.97 – 10.4.122.110	10.4.122.111
168	10.4.122.112/28	10.4.122.113 – 10.4.122.126	10.4.122.127
169	10.4.122.128/28	10.4.122.129 – 10.4.122.142	10.4.122.143
170	10.4.122.144/28	10.4.122.145 – 10.4.122.158	10.4.122.159
171	10.4.122.160/28	10.4.122.161 – 10.4.122.174	10.4.122.175
172	10.4.122.176/28	10.4.122.177 – 10.4.122.190	10.4.122.191
173	10.4.122.192/28	10.4.122.193 – 10.4.122.206	10.4.122.207
174	10.4.122.208/28	10.4.122.209 – 10.4.122.222	10.4.122.223
175	10.4.122.224/28	10.4.122.225 – 10.4.122.238	10.4.122.239
176	10.4.122.240/28	10.4.122.241 – 10.4.122.254	10.4.122.255
177	10.4.123.0/28	10.4.123.1 – 10.4.123.14	10.4.123.15
178	10.4.123.16/28	10.4.123.17 – 10.4.123.30	10.4.123.31
179	10.4.123.32/28	10.4.123.33 – 10.4.123.46	10.4.123.47
180	10.4.123.48/28	10.4.123.49 – 10.4.123.62	10.4.123.63
181	10.4.123.64/28	10.4.123.65 – 10.4.123.78	10.4.123.79
182	10.4.123.80/28	10.4.123.81 – 10.4.123.94	10.4.123.95
183	10.4.123.96/28	10.4.123.97 – 10.4.123.110	10.4.123.111
184	10.4.123.112/28	10.4.123.113 – 10.4.123.126	10.4.123.127
185	10.4.123.128/28	10.4.123.129 – 10.4.123.142	10.4.123.143
186	10.4.123.144/28	10.4.123.145 – 10.4.123.158	10.4.123.159
187	10.4.123.160/28	10.4.123.161 – 10.4.123.174	10.4.123.175
188	10.4.123.176/28	10.4.123.177 – 10.4.123.190	10.4.123.191
189	10.4.123.192/28	10.4.123.193 – 10.4.123.206	10.4.123.207
190	10.4.123.208/28	10.4.123.209 – 10.4.123.222	10.4.123.223
191	10.4.123.224/28	10.4.123.225 – 10.4.123.238	10.4.123.239
192	10.4.123.240/28	10.4.123.241 – 10.4.123.254	10.4.123.255
193	10.4.124.0/28	10.4.124.1 – 10.4.124.14	10.4.124.15
194	10.4.124.16/28	10.4.124.17 – 10.4.124.30	10.4.124.31
195	10.4.124.32/28	10.4.124.33 – 10.4.124.46	10.4.124.47
196	10.4.124.48/28	10.4.124.49 – 10.4.124.62	10.4.124.63
197	10.4.124.64/28	10.4.124.65 – 10.4.124.78	10.4.124.79
198	10.4.124.80/28	10.4.124.81 – 10.4.124.94	10.4.124.95
199	10.4.124.96/28	10.4.124.97 – 10.4.124.110	10.4.124.111
200	10.4.124.112/28	10.4.124.113 – 10.4.124.126	10.4.124.127
201	10.4.124.128/28	10.4.124.129 – 10.4.124.142	10.4.124.143
202	10.4.124.144/28	10.4.124.145 – 10.4.124.158	10.4.124.159
203	10.4.124.160/28	10.4.124.161 – 10.4.124.174	10.4.124.175
204	10.4.124.176/28	10.4.124.177 – 10.4.124.190	10.4.124.191
205	10.4.124.192/28	10.4.124.193 – 10.4.124.206	10.4.124.207
206	10.4.124.208/28	10.4.124.209 – 10.4.124.222	10.4.124.223
207	10.4.124.224/28	10.4.124.225 – 10.4.124.238	10.4.124.239
208	10.4.124.240/28	10.4.124.241 – 10.4.124.254	10.4.124.255
209	10.4.125.0/28	10.4.125.1 – 10.4.125.14	10.4.125.15
210	10.4.125.16/28	10.4.125.17 – 10.4.125.30	10.4.125.31
211	10.4.125.32/28	10.4.125.33 – 10.4.125.46	10.4.125.47
212	10.4.125.48/28	10.4.125.49 – 10.4.125.62	10.4.125.63
213	10.4.125.64/28	10.4.125.65 – 10.4.125.78	10.4.125.79
214	10.4.125.80/28	10.4.125.81 – 10.4.125.94	10.4.125.95
215	10.4.125.96/28	10.4.125.97 – 10.4.125.110	10.4.125.111
216	10.4.125.112/28	10.4.125.113 – 10.4.125.126	10.4.125.127
217	10.4.125.128/28	10.4.125.129 – 10.4.125.142	10.4.125.143
218	10.4.125.144/28	10.4.125.145 – 10.4.125.158	10.4.125.159
219	10.4.125.160/28	10.4.125.161 – 10.4.125.174	10.4.125.175
220	10.4.125.176/28	10.4.125.177 – 10.4.125.190	10.4.125.191
221	10.4.125.192/28	10.4.125.193 – 10.4.125.206	10.4.125.207
222	10.4.125.208/28	10.4.125.209 – 10.4.125.222	10.4.125.223
223	10.4.125.224/28	10.4.125.225 – 10.4.125.238	10.4.125.239
224	10.4.125.240/28	10.4.125.241 – 10.4.125.254	10.4.125.255
225	10.4.126.0/28	10.4.126.1 – 10.4.126.14	10.4.126.15
226	10.4.126.16/28	10.4.126.17 – 10.4.126.30	10.4.126.31
227	10.4.126.32/28	10.4.126.33 – 10.4.126.46	10.4.126.47
228	10.4.126.48/28	10.4.126.49 – 10.4.126.62	10.4.126.63
229	10.4.126.64/28	10.4.126.65 – 10.4.126.78	10.4.126.79
230	10.4.126.80/28	10.4.126.81 – 10.4.126.94	10.4.126.95
231	10.4.126.96/28	10.4.126.97 – 10.4.126.110	10.4.126.111
232	10.4.126.112/28	10.4.126.113 – 10.4.126.126	10.4.126.127
233	10.4.126.128/28	10.4.126.129 – 10.4.126.142	10.4.126.143
234	10.4.126.144/28	10.4.126.145 – 10.4.126.158	10.4.126.159
235	10.4.126.160/28	10.4.126.161 – 10.4.126.174	10.4.126.175
236	10.4.126.176/28	10.4.126.177 – 10.4.126.190	10.4.126.191
237	10.4.126.192/28	10.4.126.193 – 10.4.126.206	10.4.126.207
238	10.4.126.208/28	10.4.126.209 – 10.4.126.222	10.4.126.223
239	10.4.126.224/28	10.4.126.225 – 10.4.126.238	10.4.126.239
240	10.4.126.240/28	10.4.126.241 – 10.4.126.254	10.4.126.255
241	10.4.127.0/28	10.4.127.1 – 10.4.127.14	10.4.127.15
242	10.4.127.16/28	10.4.127.17 – 10.4.127.30	10.4.127.31
243	10.4.127.32/28	10.4.127.33 – 10.4.127.46	10.4.127.47
244	10.4.127.48/28	10.4.127.49 – 10.4.127.62	10.4.127.63
245	10.4.127.64/28	10.4.127.65 – 10.4.127.78	10.4.127.79
246	10.4.127.80/28	10.4.127.81 – 10.4.127.94	10.4.127.95
247	10.4.127.96/28	10.4.127.97 – 10.4.127.110	10.4.127.111
248	10.4.127.112/28	10.4.127.113 – 10.4.127.126	10.4.127.127
249	10.4.127.128/28	10.4.127.129 – 10.4.127.142	10.4.127.143
250	10.4.127.144/28	10.4.127.145 – 10.4.127.158	10.4.127.159
251	10.4.127.160/28	10.4.127.161 – 10.4.127.174	10.4.127.175
252	10.4.127.176/28	10.4.127.177 – 10.4.127.190	10.4.127.191
253	10.4.127.192/28	10.4.127.193 – 10.4.127.206	10.4.127.207
254	10.4.127.208/28	10.4.127.209 – 10.4.127.222	10.4.127.223
255	10.4.127.224/28	10.4.127.225 – 10.4.127.238	10.4.127.239
256	10.4.127.240/28	10.4.127.241 – 10.4.127.254	10.4.127.255

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 →