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)10.2.112.0/20

network10.2.112.0/20

broadcast10.2.127.255

first host10.2.112.1

last host10.2.127.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.112.0/20

address00001010.00000010.01110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.01110000.00000000

broadcast00001010.00000010.01111111.11111111

green = network part, grey = host part

hex0x0a027000

decimal167931904

reverse dns0.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.112.0/28	10.2.112.1 – 10.2.112.14	10.2.112.15
2	10.2.112.16/28	10.2.112.17 – 10.2.112.30	10.2.112.31
3	10.2.112.32/28	10.2.112.33 – 10.2.112.46	10.2.112.47
4	10.2.112.48/28	10.2.112.49 – 10.2.112.62	10.2.112.63
5	10.2.112.64/28	10.2.112.65 – 10.2.112.78	10.2.112.79
6	10.2.112.80/28	10.2.112.81 – 10.2.112.94	10.2.112.95
7	10.2.112.96/28	10.2.112.97 – 10.2.112.110	10.2.112.111
8	10.2.112.112/28	10.2.112.113 – 10.2.112.126	10.2.112.127
9	10.2.112.128/28	10.2.112.129 – 10.2.112.142	10.2.112.143
10	10.2.112.144/28	10.2.112.145 – 10.2.112.158	10.2.112.159
11	10.2.112.160/28	10.2.112.161 – 10.2.112.174	10.2.112.175
12	10.2.112.176/28	10.2.112.177 – 10.2.112.190	10.2.112.191
13	10.2.112.192/28	10.2.112.193 – 10.2.112.206	10.2.112.207
14	10.2.112.208/28	10.2.112.209 – 10.2.112.222	10.2.112.223
15	10.2.112.224/28	10.2.112.225 – 10.2.112.238	10.2.112.239
16	10.2.112.240/28	10.2.112.241 – 10.2.112.254	10.2.112.255
17	10.2.113.0/28	10.2.113.1 – 10.2.113.14	10.2.113.15
18	10.2.113.16/28	10.2.113.17 – 10.2.113.30	10.2.113.31
19	10.2.113.32/28	10.2.113.33 – 10.2.113.46	10.2.113.47
20	10.2.113.48/28	10.2.113.49 – 10.2.113.62	10.2.113.63
21	10.2.113.64/28	10.2.113.65 – 10.2.113.78	10.2.113.79
22	10.2.113.80/28	10.2.113.81 – 10.2.113.94	10.2.113.95
23	10.2.113.96/28	10.2.113.97 – 10.2.113.110	10.2.113.111
24	10.2.113.112/28	10.2.113.113 – 10.2.113.126	10.2.113.127
25	10.2.113.128/28	10.2.113.129 – 10.2.113.142	10.2.113.143
26	10.2.113.144/28	10.2.113.145 – 10.2.113.158	10.2.113.159
27	10.2.113.160/28	10.2.113.161 – 10.2.113.174	10.2.113.175
28	10.2.113.176/28	10.2.113.177 – 10.2.113.190	10.2.113.191
29	10.2.113.192/28	10.2.113.193 – 10.2.113.206	10.2.113.207
30	10.2.113.208/28	10.2.113.209 – 10.2.113.222	10.2.113.223
31	10.2.113.224/28	10.2.113.225 – 10.2.113.238	10.2.113.239
32	10.2.113.240/28	10.2.113.241 – 10.2.113.254	10.2.113.255
33	10.2.114.0/28	10.2.114.1 – 10.2.114.14	10.2.114.15
34	10.2.114.16/28	10.2.114.17 – 10.2.114.30	10.2.114.31
35	10.2.114.32/28	10.2.114.33 – 10.2.114.46	10.2.114.47
36	10.2.114.48/28	10.2.114.49 – 10.2.114.62	10.2.114.63
37	10.2.114.64/28	10.2.114.65 – 10.2.114.78	10.2.114.79
38	10.2.114.80/28	10.2.114.81 – 10.2.114.94	10.2.114.95
39	10.2.114.96/28	10.2.114.97 – 10.2.114.110	10.2.114.111
40	10.2.114.112/28	10.2.114.113 – 10.2.114.126	10.2.114.127
41	10.2.114.128/28	10.2.114.129 – 10.2.114.142	10.2.114.143
42	10.2.114.144/28	10.2.114.145 – 10.2.114.158	10.2.114.159
43	10.2.114.160/28	10.2.114.161 – 10.2.114.174	10.2.114.175
44	10.2.114.176/28	10.2.114.177 – 10.2.114.190	10.2.114.191
45	10.2.114.192/28	10.2.114.193 – 10.2.114.206	10.2.114.207
46	10.2.114.208/28	10.2.114.209 – 10.2.114.222	10.2.114.223
47	10.2.114.224/28	10.2.114.225 – 10.2.114.238	10.2.114.239
48	10.2.114.240/28	10.2.114.241 – 10.2.114.254	10.2.114.255
49	10.2.115.0/28	10.2.115.1 – 10.2.115.14	10.2.115.15
50	10.2.115.16/28	10.2.115.17 – 10.2.115.30	10.2.115.31
51	10.2.115.32/28	10.2.115.33 – 10.2.115.46	10.2.115.47
52	10.2.115.48/28	10.2.115.49 – 10.2.115.62	10.2.115.63
53	10.2.115.64/28	10.2.115.65 – 10.2.115.78	10.2.115.79
54	10.2.115.80/28	10.2.115.81 – 10.2.115.94	10.2.115.95
55	10.2.115.96/28	10.2.115.97 – 10.2.115.110	10.2.115.111
56	10.2.115.112/28	10.2.115.113 – 10.2.115.126	10.2.115.127
57	10.2.115.128/28	10.2.115.129 – 10.2.115.142	10.2.115.143
58	10.2.115.144/28	10.2.115.145 – 10.2.115.158	10.2.115.159
59	10.2.115.160/28	10.2.115.161 – 10.2.115.174	10.2.115.175
60	10.2.115.176/28	10.2.115.177 – 10.2.115.190	10.2.115.191
61	10.2.115.192/28	10.2.115.193 – 10.2.115.206	10.2.115.207
62	10.2.115.208/28	10.2.115.209 – 10.2.115.222	10.2.115.223
63	10.2.115.224/28	10.2.115.225 – 10.2.115.238	10.2.115.239
64	10.2.115.240/28	10.2.115.241 – 10.2.115.254	10.2.115.255
65	10.2.116.0/28	10.2.116.1 – 10.2.116.14	10.2.116.15
66	10.2.116.16/28	10.2.116.17 – 10.2.116.30	10.2.116.31
67	10.2.116.32/28	10.2.116.33 – 10.2.116.46	10.2.116.47
68	10.2.116.48/28	10.2.116.49 – 10.2.116.62	10.2.116.63
69	10.2.116.64/28	10.2.116.65 – 10.2.116.78	10.2.116.79
70	10.2.116.80/28	10.2.116.81 – 10.2.116.94	10.2.116.95
71	10.2.116.96/28	10.2.116.97 – 10.2.116.110	10.2.116.111
72	10.2.116.112/28	10.2.116.113 – 10.2.116.126	10.2.116.127
73	10.2.116.128/28	10.2.116.129 – 10.2.116.142	10.2.116.143
74	10.2.116.144/28	10.2.116.145 – 10.2.116.158	10.2.116.159
75	10.2.116.160/28	10.2.116.161 – 10.2.116.174	10.2.116.175
76	10.2.116.176/28	10.2.116.177 – 10.2.116.190	10.2.116.191
77	10.2.116.192/28	10.2.116.193 – 10.2.116.206	10.2.116.207
78	10.2.116.208/28	10.2.116.209 – 10.2.116.222	10.2.116.223
79	10.2.116.224/28	10.2.116.225 – 10.2.116.238	10.2.116.239
80	10.2.116.240/28	10.2.116.241 – 10.2.116.254	10.2.116.255
81	10.2.117.0/28	10.2.117.1 – 10.2.117.14	10.2.117.15
82	10.2.117.16/28	10.2.117.17 – 10.2.117.30	10.2.117.31
83	10.2.117.32/28	10.2.117.33 – 10.2.117.46	10.2.117.47
84	10.2.117.48/28	10.2.117.49 – 10.2.117.62	10.2.117.63
85	10.2.117.64/28	10.2.117.65 – 10.2.117.78	10.2.117.79
86	10.2.117.80/28	10.2.117.81 – 10.2.117.94	10.2.117.95
87	10.2.117.96/28	10.2.117.97 – 10.2.117.110	10.2.117.111
88	10.2.117.112/28	10.2.117.113 – 10.2.117.126	10.2.117.127
89	10.2.117.128/28	10.2.117.129 – 10.2.117.142	10.2.117.143
90	10.2.117.144/28	10.2.117.145 – 10.2.117.158	10.2.117.159
91	10.2.117.160/28	10.2.117.161 – 10.2.117.174	10.2.117.175
92	10.2.117.176/28	10.2.117.177 – 10.2.117.190	10.2.117.191
93	10.2.117.192/28	10.2.117.193 – 10.2.117.206	10.2.117.207
94	10.2.117.208/28	10.2.117.209 – 10.2.117.222	10.2.117.223
95	10.2.117.224/28	10.2.117.225 – 10.2.117.238	10.2.117.239
96	10.2.117.240/28	10.2.117.241 – 10.2.117.254	10.2.117.255
97	10.2.118.0/28	10.2.118.1 – 10.2.118.14	10.2.118.15
98	10.2.118.16/28	10.2.118.17 – 10.2.118.30	10.2.118.31
99	10.2.118.32/28	10.2.118.33 – 10.2.118.46	10.2.118.47
100	10.2.118.48/28	10.2.118.49 – 10.2.118.62	10.2.118.63
101	10.2.118.64/28	10.2.118.65 – 10.2.118.78	10.2.118.79
102	10.2.118.80/28	10.2.118.81 – 10.2.118.94	10.2.118.95
103	10.2.118.96/28	10.2.118.97 – 10.2.118.110	10.2.118.111
104	10.2.118.112/28	10.2.118.113 – 10.2.118.126	10.2.118.127
105	10.2.118.128/28	10.2.118.129 – 10.2.118.142	10.2.118.143
106	10.2.118.144/28	10.2.118.145 – 10.2.118.158	10.2.118.159
107	10.2.118.160/28	10.2.118.161 – 10.2.118.174	10.2.118.175
108	10.2.118.176/28	10.2.118.177 – 10.2.118.190	10.2.118.191
109	10.2.118.192/28	10.2.118.193 – 10.2.118.206	10.2.118.207
110	10.2.118.208/28	10.2.118.209 – 10.2.118.222	10.2.118.223
111	10.2.118.224/28	10.2.118.225 – 10.2.118.238	10.2.118.239
112	10.2.118.240/28	10.2.118.241 – 10.2.118.254	10.2.118.255
113	10.2.119.0/28	10.2.119.1 – 10.2.119.14	10.2.119.15
114	10.2.119.16/28	10.2.119.17 – 10.2.119.30	10.2.119.31
115	10.2.119.32/28	10.2.119.33 – 10.2.119.46	10.2.119.47
116	10.2.119.48/28	10.2.119.49 – 10.2.119.62	10.2.119.63
117	10.2.119.64/28	10.2.119.65 – 10.2.119.78	10.2.119.79
118	10.2.119.80/28	10.2.119.81 – 10.2.119.94	10.2.119.95
119	10.2.119.96/28	10.2.119.97 – 10.2.119.110	10.2.119.111
120	10.2.119.112/28	10.2.119.113 – 10.2.119.126	10.2.119.127
121	10.2.119.128/28	10.2.119.129 – 10.2.119.142	10.2.119.143
122	10.2.119.144/28	10.2.119.145 – 10.2.119.158	10.2.119.159
123	10.2.119.160/28	10.2.119.161 – 10.2.119.174	10.2.119.175
124	10.2.119.176/28	10.2.119.177 – 10.2.119.190	10.2.119.191
125	10.2.119.192/28	10.2.119.193 – 10.2.119.206	10.2.119.207
126	10.2.119.208/28	10.2.119.209 – 10.2.119.222	10.2.119.223
127	10.2.119.224/28	10.2.119.225 – 10.2.119.238	10.2.119.239
128	10.2.119.240/28	10.2.119.241 – 10.2.119.254	10.2.119.255
129	10.2.120.0/28	10.2.120.1 – 10.2.120.14	10.2.120.15
130	10.2.120.16/28	10.2.120.17 – 10.2.120.30	10.2.120.31
131	10.2.120.32/28	10.2.120.33 – 10.2.120.46	10.2.120.47
132	10.2.120.48/28	10.2.120.49 – 10.2.120.62	10.2.120.63
133	10.2.120.64/28	10.2.120.65 – 10.2.120.78	10.2.120.79
134	10.2.120.80/28	10.2.120.81 – 10.2.120.94	10.2.120.95
135	10.2.120.96/28	10.2.120.97 – 10.2.120.110	10.2.120.111
136	10.2.120.112/28	10.2.120.113 – 10.2.120.126	10.2.120.127
137	10.2.120.128/28	10.2.120.129 – 10.2.120.142	10.2.120.143
138	10.2.120.144/28	10.2.120.145 – 10.2.120.158	10.2.120.159
139	10.2.120.160/28	10.2.120.161 – 10.2.120.174	10.2.120.175
140	10.2.120.176/28	10.2.120.177 – 10.2.120.190	10.2.120.191
141	10.2.120.192/28	10.2.120.193 – 10.2.120.206	10.2.120.207
142	10.2.120.208/28	10.2.120.209 – 10.2.120.222	10.2.120.223
143	10.2.120.224/28	10.2.120.225 – 10.2.120.238	10.2.120.239
144	10.2.120.240/28	10.2.120.241 – 10.2.120.254	10.2.120.255
145	10.2.121.0/28	10.2.121.1 – 10.2.121.14	10.2.121.15
146	10.2.121.16/28	10.2.121.17 – 10.2.121.30	10.2.121.31
147	10.2.121.32/28	10.2.121.33 – 10.2.121.46	10.2.121.47
148	10.2.121.48/28	10.2.121.49 – 10.2.121.62	10.2.121.63
149	10.2.121.64/28	10.2.121.65 – 10.2.121.78	10.2.121.79
150	10.2.121.80/28	10.2.121.81 – 10.2.121.94	10.2.121.95
151	10.2.121.96/28	10.2.121.97 – 10.2.121.110	10.2.121.111
152	10.2.121.112/28	10.2.121.113 – 10.2.121.126	10.2.121.127
153	10.2.121.128/28	10.2.121.129 – 10.2.121.142	10.2.121.143
154	10.2.121.144/28	10.2.121.145 – 10.2.121.158	10.2.121.159
155	10.2.121.160/28	10.2.121.161 – 10.2.121.174	10.2.121.175
156	10.2.121.176/28	10.2.121.177 – 10.2.121.190	10.2.121.191
157	10.2.121.192/28	10.2.121.193 – 10.2.121.206	10.2.121.207
158	10.2.121.208/28	10.2.121.209 – 10.2.121.222	10.2.121.223
159	10.2.121.224/28	10.2.121.225 – 10.2.121.238	10.2.121.239
160	10.2.121.240/28	10.2.121.241 – 10.2.121.254	10.2.121.255
161	10.2.122.0/28	10.2.122.1 – 10.2.122.14	10.2.122.15
162	10.2.122.16/28	10.2.122.17 – 10.2.122.30	10.2.122.31
163	10.2.122.32/28	10.2.122.33 – 10.2.122.46	10.2.122.47
164	10.2.122.48/28	10.2.122.49 – 10.2.122.62	10.2.122.63
165	10.2.122.64/28	10.2.122.65 – 10.2.122.78	10.2.122.79
166	10.2.122.80/28	10.2.122.81 – 10.2.122.94	10.2.122.95
167	10.2.122.96/28	10.2.122.97 – 10.2.122.110	10.2.122.111
168	10.2.122.112/28	10.2.122.113 – 10.2.122.126	10.2.122.127
169	10.2.122.128/28	10.2.122.129 – 10.2.122.142	10.2.122.143
170	10.2.122.144/28	10.2.122.145 – 10.2.122.158	10.2.122.159
171	10.2.122.160/28	10.2.122.161 – 10.2.122.174	10.2.122.175
172	10.2.122.176/28	10.2.122.177 – 10.2.122.190	10.2.122.191
173	10.2.122.192/28	10.2.122.193 – 10.2.122.206	10.2.122.207
174	10.2.122.208/28	10.2.122.209 – 10.2.122.222	10.2.122.223
175	10.2.122.224/28	10.2.122.225 – 10.2.122.238	10.2.122.239
176	10.2.122.240/28	10.2.122.241 – 10.2.122.254	10.2.122.255
177	10.2.123.0/28	10.2.123.1 – 10.2.123.14	10.2.123.15
178	10.2.123.16/28	10.2.123.17 – 10.2.123.30	10.2.123.31
179	10.2.123.32/28	10.2.123.33 – 10.2.123.46	10.2.123.47
180	10.2.123.48/28	10.2.123.49 – 10.2.123.62	10.2.123.63
181	10.2.123.64/28	10.2.123.65 – 10.2.123.78	10.2.123.79
182	10.2.123.80/28	10.2.123.81 – 10.2.123.94	10.2.123.95
183	10.2.123.96/28	10.2.123.97 – 10.2.123.110	10.2.123.111
184	10.2.123.112/28	10.2.123.113 – 10.2.123.126	10.2.123.127
185	10.2.123.128/28	10.2.123.129 – 10.2.123.142	10.2.123.143
186	10.2.123.144/28	10.2.123.145 – 10.2.123.158	10.2.123.159
187	10.2.123.160/28	10.2.123.161 – 10.2.123.174	10.2.123.175
188	10.2.123.176/28	10.2.123.177 – 10.2.123.190	10.2.123.191
189	10.2.123.192/28	10.2.123.193 – 10.2.123.206	10.2.123.207
190	10.2.123.208/28	10.2.123.209 – 10.2.123.222	10.2.123.223
191	10.2.123.224/28	10.2.123.225 – 10.2.123.238	10.2.123.239
192	10.2.123.240/28	10.2.123.241 – 10.2.123.254	10.2.123.255
193	10.2.124.0/28	10.2.124.1 – 10.2.124.14	10.2.124.15
194	10.2.124.16/28	10.2.124.17 – 10.2.124.30	10.2.124.31
195	10.2.124.32/28	10.2.124.33 – 10.2.124.46	10.2.124.47
196	10.2.124.48/28	10.2.124.49 – 10.2.124.62	10.2.124.63
197	10.2.124.64/28	10.2.124.65 – 10.2.124.78	10.2.124.79
198	10.2.124.80/28	10.2.124.81 – 10.2.124.94	10.2.124.95
199	10.2.124.96/28	10.2.124.97 – 10.2.124.110	10.2.124.111
200	10.2.124.112/28	10.2.124.113 – 10.2.124.126	10.2.124.127
201	10.2.124.128/28	10.2.124.129 – 10.2.124.142	10.2.124.143
202	10.2.124.144/28	10.2.124.145 – 10.2.124.158	10.2.124.159
203	10.2.124.160/28	10.2.124.161 – 10.2.124.174	10.2.124.175
204	10.2.124.176/28	10.2.124.177 – 10.2.124.190	10.2.124.191
205	10.2.124.192/28	10.2.124.193 – 10.2.124.206	10.2.124.207
206	10.2.124.208/28	10.2.124.209 – 10.2.124.222	10.2.124.223
207	10.2.124.224/28	10.2.124.225 – 10.2.124.238	10.2.124.239
208	10.2.124.240/28	10.2.124.241 – 10.2.124.254	10.2.124.255
209	10.2.125.0/28	10.2.125.1 – 10.2.125.14	10.2.125.15
210	10.2.125.16/28	10.2.125.17 – 10.2.125.30	10.2.125.31
211	10.2.125.32/28	10.2.125.33 – 10.2.125.46	10.2.125.47
212	10.2.125.48/28	10.2.125.49 – 10.2.125.62	10.2.125.63
213	10.2.125.64/28	10.2.125.65 – 10.2.125.78	10.2.125.79
214	10.2.125.80/28	10.2.125.81 – 10.2.125.94	10.2.125.95
215	10.2.125.96/28	10.2.125.97 – 10.2.125.110	10.2.125.111
216	10.2.125.112/28	10.2.125.113 – 10.2.125.126	10.2.125.127
217	10.2.125.128/28	10.2.125.129 – 10.2.125.142	10.2.125.143
218	10.2.125.144/28	10.2.125.145 – 10.2.125.158	10.2.125.159
219	10.2.125.160/28	10.2.125.161 – 10.2.125.174	10.2.125.175
220	10.2.125.176/28	10.2.125.177 – 10.2.125.190	10.2.125.191
221	10.2.125.192/28	10.2.125.193 – 10.2.125.206	10.2.125.207
222	10.2.125.208/28	10.2.125.209 – 10.2.125.222	10.2.125.223
223	10.2.125.224/28	10.2.125.225 – 10.2.125.238	10.2.125.239
224	10.2.125.240/28	10.2.125.241 – 10.2.125.254	10.2.125.255
225	10.2.126.0/28	10.2.126.1 – 10.2.126.14	10.2.126.15
226	10.2.126.16/28	10.2.126.17 – 10.2.126.30	10.2.126.31
227	10.2.126.32/28	10.2.126.33 – 10.2.126.46	10.2.126.47
228	10.2.126.48/28	10.2.126.49 – 10.2.126.62	10.2.126.63
229	10.2.126.64/28	10.2.126.65 – 10.2.126.78	10.2.126.79
230	10.2.126.80/28	10.2.126.81 – 10.2.126.94	10.2.126.95
231	10.2.126.96/28	10.2.126.97 – 10.2.126.110	10.2.126.111
232	10.2.126.112/28	10.2.126.113 – 10.2.126.126	10.2.126.127
233	10.2.126.128/28	10.2.126.129 – 10.2.126.142	10.2.126.143
234	10.2.126.144/28	10.2.126.145 – 10.2.126.158	10.2.126.159
235	10.2.126.160/28	10.2.126.161 – 10.2.126.174	10.2.126.175
236	10.2.126.176/28	10.2.126.177 – 10.2.126.190	10.2.126.191
237	10.2.126.192/28	10.2.126.193 – 10.2.126.206	10.2.126.207
238	10.2.126.208/28	10.2.126.209 – 10.2.126.222	10.2.126.223
239	10.2.126.224/28	10.2.126.225 – 10.2.126.238	10.2.126.239
240	10.2.126.240/28	10.2.126.241 – 10.2.126.254	10.2.126.255
241	10.2.127.0/28	10.2.127.1 – 10.2.127.14	10.2.127.15
242	10.2.127.16/28	10.2.127.17 – 10.2.127.30	10.2.127.31
243	10.2.127.32/28	10.2.127.33 – 10.2.127.46	10.2.127.47
244	10.2.127.48/28	10.2.127.49 – 10.2.127.62	10.2.127.63
245	10.2.127.64/28	10.2.127.65 – 10.2.127.78	10.2.127.79
246	10.2.127.80/28	10.2.127.81 – 10.2.127.94	10.2.127.95
247	10.2.127.96/28	10.2.127.97 – 10.2.127.110	10.2.127.111
248	10.2.127.112/28	10.2.127.113 – 10.2.127.126	10.2.127.127
249	10.2.127.128/28	10.2.127.129 – 10.2.127.142	10.2.127.143
250	10.2.127.144/28	10.2.127.145 – 10.2.127.158	10.2.127.159
251	10.2.127.160/28	10.2.127.161 – 10.2.127.174	10.2.127.175
252	10.2.127.176/28	10.2.127.177 – 10.2.127.190	10.2.127.191
253	10.2.127.192/28	10.2.127.193 – 10.2.127.206	10.2.127.207
254	10.2.127.208/28	10.2.127.209 – 10.2.127.222	10.2.127.223
255	10.2.127.224/28	10.2.127.225 – 10.2.127.238	10.2.127.239
256	10.2.127.240/28	10.2.127.241 – 10.2.127.254	10.2.127.255

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 →