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)10.2.192.0/20

network10.2.192.0/20

broadcast10.2.207.255

first host10.2.192.1

last host10.2.207.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.192.0/20

address00001010.00000010.11000000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.11000000.00000000

broadcast00001010.00000010.11001111.11111111

green = network part, grey = host part

hex0x0a02c000

decimal167952384

reverse dns0.192.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.192.0/28	10.2.192.1 – 10.2.192.14	10.2.192.15
2	10.2.192.16/28	10.2.192.17 – 10.2.192.30	10.2.192.31
3	10.2.192.32/28	10.2.192.33 – 10.2.192.46	10.2.192.47
4	10.2.192.48/28	10.2.192.49 – 10.2.192.62	10.2.192.63
5	10.2.192.64/28	10.2.192.65 – 10.2.192.78	10.2.192.79
6	10.2.192.80/28	10.2.192.81 – 10.2.192.94	10.2.192.95
7	10.2.192.96/28	10.2.192.97 – 10.2.192.110	10.2.192.111
8	10.2.192.112/28	10.2.192.113 – 10.2.192.126	10.2.192.127
9	10.2.192.128/28	10.2.192.129 – 10.2.192.142	10.2.192.143
10	10.2.192.144/28	10.2.192.145 – 10.2.192.158	10.2.192.159
11	10.2.192.160/28	10.2.192.161 – 10.2.192.174	10.2.192.175
12	10.2.192.176/28	10.2.192.177 – 10.2.192.190	10.2.192.191
13	10.2.192.192/28	10.2.192.193 – 10.2.192.206	10.2.192.207
14	10.2.192.208/28	10.2.192.209 – 10.2.192.222	10.2.192.223
15	10.2.192.224/28	10.2.192.225 – 10.2.192.238	10.2.192.239
16	10.2.192.240/28	10.2.192.241 – 10.2.192.254	10.2.192.255
17	10.2.193.0/28	10.2.193.1 – 10.2.193.14	10.2.193.15
18	10.2.193.16/28	10.2.193.17 – 10.2.193.30	10.2.193.31
19	10.2.193.32/28	10.2.193.33 – 10.2.193.46	10.2.193.47
20	10.2.193.48/28	10.2.193.49 – 10.2.193.62	10.2.193.63
21	10.2.193.64/28	10.2.193.65 – 10.2.193.78	10.2.193.79
22	10.2.193.80/28	10.2.193.81 – 10.2.193.94	10.2.193.95
23	10.2.193.96/28	10.2.193.97 – 10.2.193.110	10.2.193.111
24	10.2.193.112/28	10.2.193.113 – 10.2.193.126	10.2.193.127
25	10.2.193.128/28	10.2.193.129 – 10.2.193.142	10.2.193.143
26	10.2.193.144/28	10.2.193.145 – 10.2.193.158	10.2.193.159
27	10.2.193.160/28	10.2.193.161 – 10.2.193.174	10.2.193.175
28	10.2.193.176/28	10.2.193.177 – 10.2.193.190	10.2.193.191
29	10.2.193.192/28	10.2.193.193 – 10.2.193.206	10.2.193.207
30	10.2.193.208/28	10.2.193.209 – 10.2.193.222	10.2.193.223
31	10.2.193.224/28	10.2.193.225 – 10.2.193.238	10.2.193.239
32	10.2.193.240/28	10.2.193.241 – 10.2.193.254	10.2.193.255
33	10.2.194.0/28	10.2.194.1 – 10.2.194.14	10.2.194.15
34	10.2.194.16/28	10.2.194.17 – 10.2.194.30	10.2.194.31
35	10.2.194.32/28	10.2.194.33 – 10.2.194.46	10.2.194.47
36	10.2.194.48/28	10.2.194.49 – 10.2.194.62	10.2.194.63
37	10.2.194.64/28	10.2.194.65 – 10.2.194.78	10.2.194.79
38	10.2.194.80/28	10.2.194.81 – 10.2.194.94	10.2.194.95
39	10.2.194.96/28	10.2.194.97 – 10.2.194.110	10.2.194.111
40	10.2.194.112/28	10.2.194.113 – 10.2.194.126	10.2.194.127
41	10.2.194.128/28	10.2.194.129 – 10.2.194.142	10.2.194.143
42	10.2.194.144/28	10.2.194.145 – 10.2.194.158	10.2.194.159
43	10.2.194.160/28	10.2.194.161 – 10.2.194.174	10.2.194.175
44	10.2.194.176/28	10.2.194.177 – 10.2.194.190	10.2.194.191
45	10.2.194.192/28	10.2.194.193 – 10.2.194.206	10.2.194.207
46	10.2.194.208/28	10.2.194.209 – 10.2.194.222	10.2.194.223
47	10.2.194.224/28	10.2.194.225 – 10.2.194.238	10.2.194.239
48	10.2.194.240/28	10.2.194.241 – 10.2.194.254	10.2.194.255
49	10.2.195.0/28	10.2.195.1 – 10.2.195.14	10.2.195.15
50	10.2.195.16/28	10.2.195.17 – 10.2.195.30	10.2.195.31
51	10.2.195.32/28	10.2.195.33 – 10.2.195.46	10.2.195.47
52	10.2.195.48/28	10.2.195.49 – 10.2.195.62	10.2.195.63
53	10.2.195.64/28	10.2.195.65 – 10.2.195.78	10.2.195.79
54	10.2.195.80/28	10.2.195.81 – 10.2.195.94	10.2.195.95
55	10.2.195.96/28	10.2.195.97 – 10.2.195.110	10.2.195.111
56	10.2.195.112/28	10.2.195.113 – 10.2.195.126	10.2.195.127
57	10.2.195.128/28	10.2.195.129 – 10.2.195.142	10.2.195.143
58	10.2.195.144/28	10.2.195.145 – 10.2.195.158	10.2.195.159
59	10.2.195.160/28	10.2.195.161 – 10.2.195.174	10.2.195.175
60	10.2.195.176/28	10.2.195.177 – 10.2.195.190	10.2.195.191
61	10.2.195.192/28	10.2.195.193 – 10.2.195.206	10.2.195.207
62	10.2.195.208/28	10.2.195.209 – 10.2.195.222	10.2.195.223
63	10.2.195.224/28	10.2.195.225 – 10.2.195.238	10.2.195.239
64	10.2.195.240/28	10.2.195.241 – 10.2.195.254	10.2.195.255
65	10.2.196.0/28	10.2.196.1 – 10.2.196.14	10.2.196.15
66	10.2.196.16/28	10.2.196.17 – 10.2.196.30	10.2.196.31
67	10.2.196.32/28	10.2.196.33 – 10.2.196.46	10.2.196.47
68	10.2.196.48/28	10.2.196.49 – 10.2.196.62	10.2.196.63
69	10.2.196.64/28	10.2.196.65 – 10.2.196.78	10.2.196.79
70	10.2.196.80/28	10.2.196.81 – 10.2.196.94	10.2.196.95
71	10.2.196.96/28	10.2.196.97 – 10.2.196.110	10.2.196.111
72	10.2.196.112/28	10.2.196.113 – 10.2.196.126	10.2.196.127
73	10.2.196.128/28	10.2.196.129 – 10.2.196.142	10.2.196.143
74	10.2.196.144/28	10.2.196.145 – 10.2.196.158	10.2.196.159
75	10.2.196.160/28	10.2.196.161 – 10.2.196.174	10.2.196.175
76	10.2.196.176/28	10.2.196.177 – 10.2.196.190	10.2.196.191
77	10.2.196.192/28	10.2.196.193 – 10.2.196.206	10.2.196.207
78	10.2.196.208/28	10.2.196.209 – 10.2.196.222	10.2.196.223
79	10.2.196.224/28	10.2.196.225 – 10.2.196.238	10.2.196.239
80	10.2.196.240/28	10.2.196.241 – 10.2.196.254	10.2.196.255
81	10.2.197.0/28	10.2.197.1 – 10.2.197.14	10.2.197.15
82	10.2.197.16/28	10.2.197.17 – 10.2.197.30	10.2.197.31
83	10.2.197.32/28	10.2.197.33 – 10.2.197.46	10.2.197.47
84	10.2.197.48/28	10.2.197.49 – 10.2.197.62	10.2.197.63
85	10.2.197.64/28	10.2.197.65 – 10.2.197.78	10.2.197.79
86	10.2.197.80/28	10.2.197.81 – 10.2.197.94	10.2.197.95
87	10.2.197.96/28	10.2.197.97 – 10.2.197.110	10.2.197.111
88	10.2.197.112/28	10.2.197.113 – 10.2.197.126	10.2.197.127
89	10.2.197.128/28	10.2.197.129 – 10.2.197.142	10.2.197.143
90	10.2.197.144/28	10.2.197.145 – 10.2.197.158	10.2.197.159
91	10.2.197.160/28	10.2.197.161 – 10.2.197.174	10.2.197.175
92	10.2.197.176/28	10.2.197.177 – 10.2.197.190	10.2.197.191
93	10.2.197.192/28	10.2.197.193 – 10.2.197.206	10.2.197.207
94	10.2.197.208/28	10.2.197.209 – 10.2.197.222	10.2.197.223
95	10.2.197.224/28	10.2.197.225 – 10.2.197.238	10.2.197.239
96	10.2.197.240/28	10.2.197.241 – 10.2.197.254	10.2.197.255
97	10.2.198.0/28	10.2.198.1 – 10.2.198.14	10.2.198.15
98	10.2.198.16/28	10.2.198.17 – 10.2.198.30	10.2.198.31
99	10.2.198.32/28	10.2.198.33 – 10.2.198.46	10.2.198.47
100	10.2.198.48/28	10.2.198.49 – 10.2.198.62	10.2.198.63
101	10.2.198.64/28	10.2.198.65 – 10.2.198.78	10.2.198.79
102	10.2.198.80/28	10.2.198.81 – 10.2.198.94	10.2.198.95
103	10.2.198.96/28	10.2.198.97 – 10.2.198.110	10.2.198.111
104	10.2.198.112/28	10.2.198.113 – 10.2.198.126	10.2.198.127
105	10.2.198.128/28	10.2.198.129 – 10.2.198.142	10.2.198.143
106	10.2.198.144/28	10.2.198.145 – 10.2.198.158	10.2.198.159
107	10.2.198.160/28	10.2.198.161 – 10.2.198.174	10.2.198.175
108	10.2.198.176/28	10.2.198.177 – 10.2.198.190	10.2.198.191
109	10.2.198.192/28	10.2.198.193 – 10.2.198.206	10.2.198.207
110	10.2.198.208/28	10.2.198.209 – 10.2.198.222	10.2.198.223
111	10.2.198.224/28	10.2.198.225 – 10.2.198.238	10.2.198.239
112	10.2.198.240/28	10.2.198.241 – 10.2.198.254	10.2.198.255
113	10.2.199.0/28	10.2.199.1 – 10.2.199.14	10.2.199.15
114	10.2.199.16/28	10.2.199.17 – 10.2.199.30	10.2.199.31
115	10.2.199.32/28	10.2.199.33 – 10.2.199.46	10.2.199.47
116	10.2.199.48/28	10.2.199.49 – 10.2.199.62	10.2.199.63
117	10.2.199.64/28	10.2.199.65 – 10.2.199.78	10.2.199.79
118	10.2.199.80/28	10.2.199.81 – 10.2.199.94	10.2.199.95
119	10.2.199.96/28	10.2.199.97 – 10.2.199.110	10.2.199.111
120	10.2.199.112/28	10.2.199.113 – 10.2.199.126	10.2.199.127
121	10.2.199.128/28	10.2.199.129 – 10.2.199.142	10.2.199.143
122	10.2.199.144/28	10.2.199.145 – 10.2.199.158	10.2.199.159
123	10.2.199.160/28	10.2.199.161 – 10.2.199.174	10.2.199.175
124	10.2.199.176/28	10.2.199.177 – 10.2.199.190	10.2.199.191
125	10.2.199.192/28	10.2.199.193 – 10.2.199.206	10.2.199.207
126	10.2.199.208/28	10.2.199.209 – 10.2.199.222	10.2.199.223
127	10.2.199.224/28	10.2.199.225 – 10.2.199.238	10.2.199.239
128	10.2.199.240/28	10.2.199.241 – 10.2.199.254	10.2.199.255
129	10.2.200.0/28	10.2.200.1 – 10.2.200.14	10.2.200.15
130	10.2.200.16/28	10.2.200.17 – 10.2.200.30	10.2.200.31
131	10.2.200.32/28	10.2.200.33 – 10.2.200.46	10.2.200.47
132	10.2.200.48/28	10.2.200.49 – 10.2.200.62	10.2.200.63
133	10.2.200.64/28	10.2.200.65 – 10.2.200.78	10.2.200.79
134	10.2.200.80/28	10.2.200.81 – 10.2.200.94	10.2.200.95
135	10.2.200.96/28	10.2.200.97 – 10.2.200.110	10.2.200.111
136	10.2.200.112/28	10.2.200.113 – 10.2.200.126	10.2.200.127
137	10.2.200.128/28	10.2.200.129 – 10.2.200.142	10.2.200.143
138	10.2.200.144/28	10.2.200.145 – 10.2.200.158	10.2.200.159
139	10.2.200.160/28	10.2.200.161 – 10.2.200.174	10.2.200.175
140	10.2.200.176/28	10.2.200.177 – 10.2.200.190	10.2.200.191
141	10.2.200.192/28	10.2.200.193 – 10.2.200.206	10.2.200.207
142	10.2.200.208/28	10.2.200.209 – 10.2.200.222	10.2.200.223
143	10.2.200.224/28	10.2.200.225 – 10.2.200.238	10.2.200.239
144	10.2.200.240/28	10.2.200.241 – 10.2.200.254	10.2.200.255
145	10.2.201.0/28	10.2.201.1 – 10.2.201.14	10.2.201.15
146	10.2.201.16/28	10.2.201.17 – 10.2.201.30	10.2.201.31
147	10.2.201.32/28	10.2.201.33 – 10.2.201.46	10.2.201.47
148	10.2.201.48/28	10.2.201.49 – 10.2.201.62	10.2.201.63
149	10.2.201.64/28	10.2.201.65 – 10.2.201.78	10.2.201.79
150	10.2.201.80/28	10.2.201.81 – 10.2.201.94	10.2.201.95
151	10.2.201.96/28	10.2.201.97 – 10.2.201.110	10.2.201.111
152	10.2.201.112/28	10.2.201.113 – 10.2.201.126	10.2.201.127
153	10.2.201.128/28	10.2.201.129 – 10.2.201.142	10.2.201.143
154	10.2.201.144/28	10.2.201.145 – 10.2.201.158	10.2.201.159
155	10.2.201.160/28	10.2.201.161 – 10.2.201.174	10.2.201.175
156	10.2.201.176/28	10.2.201.177 – 10.2.201.190	10.2.201.191
157	10.2.201.192/28	10.2.201.193 – 10.2.201.206	10.2.201.207
158	10.2.201.208/28	10.2.201.209 – 10.2.201.222	10.2.201.223
159	10.2.201.224/28	10.2.201.225 – 10.2.201.238	10.2.201.239
160	10.2.201.240/28	10.2.201.241 – 10.2.201.254	10.2.201.255
161	10.2.202.0/28	10.2.202.1 – 10.2.202.14	10.2.202.15
162	10.2.202.16/28	10.2.202.17 – 10.2.202.30	10.2.202.31
163	10.2.202.32/28	10.2.202.33 – 10.2.202.46	10.2.202.47
164	10.2.202.48/28	10.2.202.49 – 10.2.202.62	10.2.202.63
165	10.2.202.64/28	10.2.202.65 – 10.2.202.78	10.2.202.79
166	10.2.202.80/28	10.2.202.81 – 10.2.202.94	10.2.202.95
167	10.2.202.96/28	10.2.202.97 – 10.2.202.110	10.2.202.111
168	10.2.202.112/28	10.2.202.113 – 10.2.202.126	10.2.202.127
169	10.2.202.128/28	10.2.202.129 – 10.2.202.142	10.2.202.143
170	10.2.202.144/28	10.2.202.145 – 10.2.202.158	10.2.202.159
171	10.2.202.160/28	10.2.202.161 – 10.2.202.174	10.2.202.175
172	10.2.202.176/28	10.2.202.177 – 10.2.202.190	10.2.202.191
173	10.2.202.192/28	10.2.202.193 – 10.2.202.206	10.2.202.207
174	10.2.202.208/28	10.2.202.209 – 10.2.202.222	10.2.202.223
175	10.2.202.224/28	10.2.202.225 – 10.2.202.238	10.2.202.239
176	10.2.202.240/28	10.2.202.241 – 10.2.202.254	10.2.202.255
177	10.2.203.0/28	10.2.203.1 – 10.2.203.14	10.2.203.15
178	10.2.203.16/28	10.2.203.17 – 10.2.203.30	10.2.203.31
179	10.2.203.32/28	10.2.203.33 – 10.2.203.46	10.2.203.47
180	10.2.203.48/28	10.2.203.49 – 10.2.203.62	10.2.203.63
181	10.2.203.64/28	10.2.203.65 – 10.2.203.78	10.2.203.79
182	10.2.203.80/28	10.2.203.81 – 10.2.203.94	10.2.203.95
183	10.2.203.96/28	10.2.203.97 – 10.2.203.110	10.2.203.111
184	10.2.203.112/28	10.2.203.113 – 10.2.203.126	10.2.203.127
185	10.2.203.128/28	10.2.203.129 – 10.2.203.142	10.2.203.143
186	10.2.203.144/28	10.2.203.145 – 10.2.203.158	10.2.203.159
187	10.2.203.160/28	10.2.203.161 – 10.2.203.174	10.2.203.175
188	10.2.203.176/28	10.2.203.177 – 10.2.203.190	10.2.203.191
189	10.2.203.192/28	10.2.203.193 – 10.2.203.206	10.2.203.207
190	10.2.203.208/28	10.2.203.209 – 10.2.203.222	10.2.203.223
191	10.2.203.224/28	10.2.203.225 – 10.2.203.238	10.2.203.239
192	10.2.203.240/28	10.2.203.241 – 10.2.203.254	10.2.203.255
193	10.2.204.0/28	10.2.204.1 – 10.2.204.14	10.2.204.15
194	10.2.204.16/28	10.2.204.17 – 10.2.204.30	10.2.204.31
195	10.2.204.32/28	10.2.204.33 – 10.2.204.46	10.2.204.47
196	10.2.204.48/28	10.2.204.49 – 10.2.204.62	10.2.204.63
197	10.2.204.64/28	10.2.204.65 – 10.2.204.78	10.2.204.79
198	10.2.204.80/28	10.2.204.81 – 10.2.204.94	10.2.204.95
199	10.2.204.96/28	10.2.204.97 – 10.2.204.110	10.2.204.111
200	10.2.204.112/28	10.2.204.113 – 10.2.204.126	10.2.204.127
201	10.2.204.128/28	10.2.204.129 – 10.2.204.142	10.2.204.143
202	10.2.204.144/28	10.2.204.145 – 10.2.204.158	10.2.204.159
203	10.2.204.160/28	10.2.204.161 – 10.2.204.174	10.2.204.175
204	10.2.204.176/28	10.2.204.177 – 10.2.204.190	10.2.204.191
205	10.2.204.192/28	10.2.204.193 – 10.2.204.206	10.2.204.207
206	10.2.204.208/28	10.2.204.209 – 10.2.204.222	10.2.204.223
207	10.2.204.224/28	10.2.204.225 – 10.2.204.238	10.2.204.239
208	10.2.204.240/28	10.2.204.241 – 10.2.204.254	10.2.204.255
209	10.2.205.0/28	10.2.205.1 – 10.2.205.14	10.2.205.15
210	10.2.205.16/28	10.2.205.17 – 10.2.205.30	10.2.205.31
211	10.2.205.32/28	10.2.205.33 – 10.2.205.46	10.2.205.47
212	10.2.205.48/28	10.2.205.49 – 10.2.205.62	10.2.205.63
213	10.2.205.64/28	10.2.205.65 – 10.2.205.78	10.2.205.79
214	10.2.205.80/28	10.2.205.81 – 10.2.205.94	10.2.205.95
215	10.2.205.96/28	10.2.205.97 – 10.2.205.110	10.2.205.111
216	10.2.205.112/28	10.2.205.113 – 10.2.205.126	10.2.205.127
217	10.2.205.128/28	10.2.205.129 – 10.2.205.142	10.2.205.143
218	10.2.205.144/28	10.2.205.145 – 10.2.205.158	10.2.205.159
219	10.2.205.160/28	10.2.205.161 – 10.2.205.174	10.2.205.175
220	10.2.205.176/28	10.2.205.177 – 10.2.205.190	10.2.205.191
221	10.2.205.192/28	10.2.205.193 – 10.2.205.206	10.2.205.207
222	10.2.205.208/28	10.2.205.209 – 10.2.205.222	10.2.205.223
223	10.2.205.224/28	10.2.205.225 – 10.2.205.238	10.2.205.239
224	10.2.205.240/28	10.2.205.241 – 10.2.205.254	10.2.205.255
225	10.2.206.0/28	10.2.206.1 – 10.2.206.14	10.2.206.15
226	10.2.206.16/28	10.2.206.17 – 10.2.206.30	10.2.206.31
227	10.2.206.32/28	10.2.206.33 – 10.2.206.46	10.2.206.47
228	10.2.206.48/28	10.2.206.49 – 10.2.206.62	10.2.206.63
229	10.2.206.64/28	10.2.206.65 – 10.2.206.78	10.2.206.79
230	10.2.206.80/28	10.2.206.81 – 10.2.206.94	10.2.206.95
231	10.2.206.96/28	10.2.206.97 – 10.2.206.110	10.2.206.111
232	10.2.206.112/28	10.2.206.113 – 10.2.206.126	10.2.206.127
233	10.2.206.128/28	10.2.206.129 – 10.2.206.142	10.2.206.143
234	10.2.206.144/28	10.2.206.145 – 10.2.206.158	10.2.206.159
235	10.2.206.160/28	10.2.206.161 – 10.2.206.174	10.2.206.175
236	10.2.206.176/28	10.2.206.177 – 10.2.206.190	10.2.206.191
237	10.2.206.192/28	10.2.206.193 – 10.2.206.206	10.2.206.207
238	10.2.206.208/28	10.2.206.209 – 10.2.206.222	10.2.206.223
239	10.2.206.224/28	10.2.206.225 – 10.2.206.238	10.2.206.239
240	10.2.206.240/28	10.2.206.241 – 10.2.206.254	10.2.206.255
241	10.2.207.0/28	10.2.207.1 – 10.2.207.14	10.2.207.15
242	10.2.207.16/28	10.2.207.17 – 10.2.207.30	10.2.207.31
243	10.2.207.32/28	10.2.207.33 – 10.2.207.46	10.2.207.47
244	10.2.207.48/28	10.2.207.49 – 10.2.207.62	10.2.207.63
245	10.2.207.64/28	10.2.207.65 – 10.2.207.78	10.2.207.79
246	10.2.207.80/28	10.2.207.81 – 10.2.207.94	10.2.207.95
247	10.2.207.96/28	10.2.207.97 – 10.2.207.110	10.2.207.111
248	10.2.207.112/28	10.2.207.113 – 10.2.207.126	10.2.207.127
249	10.2.207.128/28	10.2.207.129 – 10.2.207.142	10.2.207.143
250	10.2.207.144/28	10.2.207.145 – 10.2.207.158	10.2.207.159
251	10.2.207.160/28	10.2.207.161 – 10.2.207.174	10.2.207.175
252	10.2.207.176/28	10.2.207.177 – 10.2.207.190	10.2.207.191
253	10.2.207.192/28	10.2.207.193 – 10.2.207.206	10.2.207.207
254	10.2.207.208/28	10.2.207.209 – 10.2.207.222	10.2.207.223
255	10.2.207.224/28	10.2.207.225 – 10.2.207.238	10.2.207.239
256	10.2.207.240/28	10.2.207.241 – 10.2.207.254	10.2.207.255

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 →