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)10.3.80.0/20

network10.3.80.0/20

broadcast10.3.95.255

first host10.3.80.1

last host10.3.95.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.80.0/20

address00001010.00000011.01010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.01010000.00000000

broadcast00001010.00000011.01011111.11111111

green = network part, grey = host part

hex0x0a035000

decimal167989248

reverse dns0.80.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:5000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.80.0/28	10.3.80.1 – 10.3.80.14	10.3.80.15
2	10.3.80.16/28	10.3.80.17 – 10.3.80.30	10.3.80.31
3	10.3.80.32/28	10.3.80.33 – 10.3.80.46	10.3.80.47
4	10.3.80.48/28	10.3.80.49 – 10.3.80.62	10.3.80.63
5	10.3.80.64/28	10.3.80.65 – 10.3.80.78	10.3.80.79
6	10.3.80.80/28	10.3.80.81 – 10.3.80.94	10.3.80.95
7	10.3.80.96/28	10.3.80.97 – 10.3.80.110	10.3.80.111
8	10.3.80.112/28	10.3.80.113 – 10.3.80.126	10.3.80.127
9	10.3.80.128/28	10.3.80.129 – 10.3.80.142	10.3.80.143
10	10.3.80.144/28	10.3.80.145 – 10.3.80.158	10.3.80.159
11	10.3.80.160/28	10.3.80.161 – 10.3.80.174	10.3.80.175
12	10.3.80.176/28	10.3.80.177 – 10.3.80.190	10.3.80.191
13	10.3.80.192/28	10.3.80.193 – 10.3.80.206	10.3.80.207
14	10.3.80.208/28	10.3.80.209 – 10.3.80.222	10.3.80.223
15	10.3.80.224/28	10.3.80.225 – 10.3.80.238	10.3.80.239
16	10.3.80.240/28	10.3.80.241 – 10.3.80.254	10.3.80.255
17	10.3.81.0/28	10.3.81.1 – 10.3.81.14	10.3.81.15
18	10.3.81.16/28	10.3.81.17 – 10.3.81.30	10.3.81.31
19	10.3.81.32/28	10.3.81.33 – 10.3.81.46	10.3.81.47
20	10.3.81.48/28	10.3.81.49 – 10.3.81.62	10.3.81.63
21	10.3.81.64/28	10.3.81.65 – 10.3.81.78	10.3.81.79
22	10.3.81.80/28	10.3.81.81 – 10.3.81.94	10.3.81.95
23	10.3.81.96/28	10.3.81.97 – 10.3.81.110	10.3.81.111
24	10.3.81.112/28	10.3.81.113 – 10.3.81.126	10.3.81.127
25	10.3.81.128/28	10.3.81.129 – 10.3.81.142	10.3.81.143
26	10.3.81.144/28	10.3.81.145 – 10.3.81.158	10.3.81.159
27	10.3.81.160/28	10.3.81.161 – 10.3.81.174	10.3.81.175
28	10.3.81.176/28	10.3.81.177 – 10.3.81.190	10.3.81.191
29	10.3.81.192/28	10.3.81.193 – 10.3.81.206	10.3.81.207
30	10.3.81.208/28	10.3.81.209 – 10.3.81.222	10.3.81.223
31	10.3.81.224/28	10.3.81.225 – 10.3.81.238	10.3.81.239
32	10.3.81.240/28	10.3.81.241 – 10.3.81.254	10.3.81.255
33	10.3.82.0/28	10.3.82.1 – 10.3.82.14	10.3.82.15
34	10.3.82.16/28	10.3.82.17 – 10.3.82.30	10.3.82.31
35	10.3.82.32/28	10.3.82.33 – 10.3.82.46	10.3.82.47
36	10.3.82.48/28	10.3.82.49 – 10.3.82.62	10.3.82.63
37	10.3.82.64/28	10.3.82.65 – 10.3.82.78	10.3.82.79
38	10.3.82.80/28	10.3.82.81 – 10.3.82.94	10.3.82.95
39	10.3.82.96/28	10.3.82.97 – 10.3.82.110	10.3.82.111
40	10.3.82.112/28	10.3.82.113 – 10.3.82.126	10.3.82.127
41	10.3.82.128/28	10.3.82.129 – 10.3.82.142	10.3.82.143
42	10.3.82.144/28	10.3.82.145 – 10.3.82.158	10.3.82.159
43	10.3.82.160/28	10.3.82.161 – 10.3.82.174	10.3.82.175
44	10.3.82.176/28	10.3.82.177 – 10.3.82.190	10.3.82.191
45	10.3.82.192/28	10.3.82.193 – 10.3.82.206	10.3.82.207
46	10.3.82.208/28	10.3.82.209 – 10.3.82.222	10.3.82.223
47	10.3.82.224/28	10.3.82.225 – 10.3.82.238	10.3.82.239
48	10.3.82.240/28	10.3.82.241 – 10.3.82.254	10.3.82.255
49	10.3.83.0/28	10.3.83.1 – 10.3.83.14	10.3.83.15
50	10.3.83.16/28	10.3.83.17 – 10.3.83.30	10.3.83.31
51	10.3.83.32/28	10.3.83.33 – 10.3.83.46	10.3.83.47
52	10.3.83.48/28	10.3.83.49 – 10.3.83.62	10.3.83.63
53	10.3.83.64/28	10.3.83.65 – 10.3.83.78	10.3.83.79
54	10.3.83.80/28	10.3.83.81 – 10.3.83.94	10.3.83.95
55	10.3.83.96/28	10.3.83.97 – 10.3.83.110	10.3.83.111
56	10.3.83.112/28	10.3.83.113 – 10.3.83.126	10.3.83.127
57	10.3.83.128/28	10.3.83.129 – 10.3.83.142	10.3.83.143
58	10.3.83.144/28	10.3.83.145 – 10.3.83.158	10.3.83.159
59	10.3.83.160/28	10.3.83.161 – 10.3.83.174	10.3.83.175
60	10.3.83.176/28	10.3.83.177 – 10.3.83.190	10.3.83.191
61	10.3.83.192/28	10.3.83.193 – 10.3.83.206	10.3.83.207
62	10.3.83.208/28	10.3.83.209 – 10.3.83.222	10.3.83.223
63	10.3.83.224/28	10.3.83.225 – 10.3.83.238	10.3.83.239
64	10.3.83.240/28	10.3.83.241 – 10.3.83.254	10.3.83.255
65	10.3.84.0/28	10.3.84.1 – 10.3.84.14	10.3.84.15
66	10.3.84.16/28	10.3.84.17 – 10.3.84.30	10.3.84.31
67	10.3.84.32/28	10.3.84.33 – 10.3.84.46	10.3.84.47
68	10.3.84.48/28	10.3.84.49 – 10.3.84.62	10.3.84.63
69	10.3.84.64/28	10.3.84.65 – 10.3.84.78	10.3.84.79
70	10.3.84.80/28	10.3.84.81 – 10.3.84.94	10.3.84.95
71	10.3.84.96/28	10.3.84.97 – 10.3.84.110	10.3.84.111
72	10.3.84.112/28	10.3.84.113 – 10.3.84.126	10.3.84.127
73	10.3.84.128/28	10.3.84.129 – 10.3.84.142	10.3.84.143
74	10.3.84.144/28	10.3.84.145 – 10.3.84.158	10.3.84.159
75	10.3.84.160/28	10.3.84.161 – 10.3.84.174	10.3.84.175
76	10.3.84.176/28	10.3.84.177 – 10.3.84.190	10.3.84.191
77	10.3.84.192/28	10.3.84.193 – 10.3.84.206	10.3.84.207
78	10.3.84.208/28	10.3.84.209 – 10.3.84.222	10.3.84.223
79	10.3.84.224/28	10.3.84.225 – 10.3.84.238	10.3.84.239
80	10.3.84.240/28	10.3.84.241 – 10.3.84.254	10.3.84.255
81	10.3.85.0/28	10.3.85.1 – 10.3.85.14	10.3.85.15
82	10.3.85.16/28	10.3.85.17 – 10.3.85.30	10.3.85.31
83	10.3.85.32/28	10.3.85.33 – 10.3.85.46	10.3.85.47
84	10.3.85.48/28	10.3.85.49 – 10.3.85.62	10.3.85.63
85	10.3.85.64/28	10.3.85.65 – 10.3.85.78	10.3.85.79
86	10.3.85.80/28	10.3.85.81 – 10.3.85.94	10.3.85.95
87	10.3.85.96/28	10.3.85.97 – 10.3.85.110	10.3.85.111
88	10.3.85.112/28	10.3.85.113 – 10.3.85.126	10.3.85.127
89	10.3.85.128/28	10.3.85.129 – 10.3.85.142	10.3.85.143
90	10.3.85.144/28	10.3.85.145 – 10.3.85.158	10.3.85.159
91	10.3.85.160/28	10.3.85.161 – 10.3.85.174	10.3.85.175
92	10.3.85.176/28	10.3.85.177 – 10.3.85.190	10.3.85.191
93	10.3.85.192/28	10.3.85.193 – 10.3.85.206	10.3.85.207
94	10.3.85.208/28	10.3.85.209 – 10.3.85.222	10.3.85.223
95	10.3.85.224/28	10.3.85.225 – 10.3.85.238	10.3.85.239
96	10.3.85.240/28	10.3.85.241 – 10.3.85.254	10.3.85.255
97	10.3.86.0/28	10.3.86.1 – 10.3.86.14	10.3.86.15
98	10.3.86.16/28	10.3.86.17 – 10.3.86.30	10.3.86.31
99	10.3.86.32/28	10.3.86.33 – 10.3.86.46	10.3.86.47
100	10.3.86.48/28	10.3.86.49 – 10.3.86.62	10.3.86.63
101	10.3.86.64/28	10.3.86.65 – 10.3.86.78	10.3.86.79
102	10.3.86.80/28	10.3.86.81 – 10.3.86.94	10.3.86.95
103	10.3.86.96/28	10.3.86.97 – 10.3.86.110	10.3.86.111
104	10.3.86.112/28	10.3.86.113 – 10.3.86.126	10.3.86.127
105	10.3.86.128/28	10.3.86.129 – 10.3.86.142	10.3.86.143
106	10.3.86.144/28	10.3.86.145 – 10.3.86.158	10.3.86.159
107	10.3.86.160/28	10.3.86.161 – 10.3.86.174	10.3.86.175
108	10.3.86.176/28	10.3.86.177 – 10.3.86.190	10.3.86.191
109	10.3.86.192/28	10.3.86.193 – 10.3.86.206	10.3.86.207
110	10.3.86.208/28	10.3.86.209 – 10.3.86.222	10.3.86.223
111	10.3.86.224/28	10.3.86.225 – 10.3.86.238	10.3.86.239
112	10.3.86.240/28	10.3.86.241 – 10.3.86.254	10.3.86.255
113	10.3.87.0/28	10.3.87.1 – 10.3.87.14	10.3.87.15
114	10.3.87.16/28	10.3.87.17 – 10.3.87.30	10.3.87.31
115	10.3.87.32/28	10.3.87.33 – 10.3.87.46	10.3.87.47
116	10.3.87.48/28	10.3.87.49 – 10.3.87.62	10.3.87.63
117	10.3.87.64/28	10.3.87.65 – 10.3.87.78	10.3.87.79
118	10.3.87.80/28	10.3.87.81 – 10.3.87.94	10.3.87.95
119	10.3.87.96/28	10.3.87.97 – 10.3.87.110	10.3.87.111
120	10.3.87.112/28	10.3.87.113 – 10.3.87.126	10.3.87.127
121	10.3.87.128/28	10.3.87.129 – 10.3.87.142	10.3.87.143
122	10.3.87.144/28	10.3.87.145 – 10.3.87.158	10.3.87.159
123	10.3.87.160/28	10.3.87.161 – 10.3.87.174	10.3.87.175
124	10.3.87.176/28	10.3.87.177 – 10.3.87.190	10.3.87.191
125	10.3.87.192/28	10.3.87.193 – 10.3.87.206	10.3.87.207
126	10.3.87.208/28	10.3.87.209 – 10.3.87.222	10.3.87.223
127	10.3.87.224/28	10.3.87.225 – 10.3.87.238	10.3.87.239
128	10.3.87.240/28	10.3.87.241 – 10.3.87.254	10.3.87.255
129	10.3.88.0/28	10.3.88.1 – 10.3.88.14	10.3.88.15
130	10.3.88.16/28	10.3.88.17 – 10.3.88.30	10.3.88.31
131	10.3.88.32/28	10.3.88.33 – 10.3.88.46	10.3.88.47
132	10.3.88.48/28	10.3.88.49 – 10.3.88.62	10.3.88.63
133	10.3.88.64/28	10.3.88.65 – 10.3.88.78	10.3.88.79
134	10.3.88.80/28	10.3.88.81 – 10.3.88.94	10.3.88.95
135	10.3.88.96/28	10.3.88.97 – 10.3.88.110	10.3.88.111
136	10.3.88.112/28	10.3.88.113 – 10.3.88.126	10.3.88.127
137	10.3.88.128/28	10.3.88.129 – 10.3.88.142	10.3.88.143
138	10.3.88.144/28	10.3.88.145 – 10.3.88.158	10.3.88.159
139	10.3.88.160/28	10.3.88.161 – 10.3.88.174	10.3.88.175
140	10.3.88.176/28	10.3.88.177 – 10.3.88.190	10.3.88.191
141	10.3.88.192/28	10.3.88.193 – 10.3.88.206	10.3.88.207
142	10.3.88.208/28	10.3.88.209 – 10.3.88.222	10.3.88.223
143	10.3.88.224/28	10.3.88.225 – 10.3.88.238	10.3.88.239
144	10.3.88.240/28	10.3.88.241 – 10.3.88.254	10.3.88.255
145	10.3.89.0/28	10.3.89.1 – 10.3.89.14	10.3.89.15
146	10.3.89.16/28	10.3.89.17 – 10.3.89.30	10.3.89.31
147	10.3.89.32/28	10.3.89.33 – 10.3.89.46	10.3.89.47
148	10.3.89.48/28	10.3.89.49 – 10.3.89.62	10.3.89.63
149	10.3.89.64/28	10.3.89.65 – 10.3.89.78	10.3.89.79
150	10.3.89.80/28	10.3.89.81 – 10.3.89.94	10.3.89.95
151	10.3.89.96/28	10.3.89.97 – 10.3.89.110	10.3.89.111
152	10.3.89.112/28	10.3.89.113 – 10.3.89.126	10.3.89.127
153	10.3.89.128/28	10.3.89.129 – 10.3.89.142	10.3.89.143
154	10.3.89.144/28	10.3.89.145 – 10.3.89.158	10.3.89.159
155	10.3.89.160/28	10.3.89.161 – 10.3.89.174	10.3.89.175
156	10.3.89.176/28	10.3.89.177 – 10.3.89.190	10.3.89.191
157	10.3.89.192/28	10.3.89.193 – 10.3.89.206	10.3.89.207
158	10.3.89.208/28	10.3.89.209 – 10.3.89.222	10.3.89.223
159	10.3.89.224/28	10.3.89.225 – 10.3.89.238	10.3.89.239
160	10.3.89.240/28	10.3.89.241 – 10.3.89.254	10.3.89.255
161	10.3.90.0/28	10.3.90.1 – 10.3.90.14	10.3.90.15
162	10.3.90.16/28	10.3.90.17 – 10.3.90.30	10.3.90.31
163	10.3.90.32/28	10.3.90.33 – 10.3.90.46	10.3.90.47
164	10.3.90.48/28	10.3.90.49 – 10.3.90.62	10.3.90.63
165	10.3.90.64/28	10.3.90.65 – 10.3.90.78	10.3.90.79
166	10.3.90.80/28	10.3.90.81 – 10.3.90.94	10.3.90.95
167	10.3.90.96/28	10.3.90.97 – 10.3.90.110	10.3.90.111
168	10.3.90.112/28	10.3.90.113 – 10.3.90.126	10.3.90.127
169	10.3.90.128/28	10.3.90.129 – 10.3.90.142	10.3.90.143
170	10.3.90.144/28	10.3.90.145 – 10.3.90.158	10.3.90.159
171	10.3.90.160/28	10.3.90.161 – 10.3.90.174	10.3.90.175
172	10.3.90.176/28	10.3.90.177 – 10.3.90.190	10.3.90.191
173	10.3.90.192/28	10.3.90.193 – 10.3.90.206	10.3.90.207
174	10.3.90.208/28	10.3.90.209 – 10.3.90.222	10.3.90.223
175	10.3.90.224/28	10.3.90.225 – 10.3.90.238	10.3.90.239
176	10.3.90.240/28	10.3.90.241 – 10.3.90.254	10.3.90.255
177	10.3.91.0/28	10.3.91.1 – 10.3.91.14	10.3.91.15
178	10.3.91.16/28	10.3.91.17 – 10.3.91.30	10.3.91.31
179	10.3.91.32/28	10.3.91.33 – 10.3.91.46	10.3.91.47
180	10.3.91.48/28	10.3.91.49 – 10.3.91.62	10.3.91.63
181	10.3.91.64/28	10.3.91.65 – 10.3.91.78	10.3.91.79
182	10.3.91.80/28	10.3.91.81 – 10.3.91.94	10.3.91.95
183	10.3.91.96/28	10.3.91.97 – 10.3.91.110	10.3.91.111
184	10.3.91.112/28	10.3.91.113 – 10.3.91.126	10.3.91.127
185	10.3.91.128/28	10.3.91.129 – 10.3.91.142	10.3.91.143
186	10.3.91.144/28	10.3.91.145 – 10.3.91.158	10.3.91.159
187	10.3.91.160/28	10.3.91.161 – 10.3.91.174	10.3.91.175
188	10.3.91.176/28	10.3.91.177 – 10.3.91.190	10.3.91.191
189	10.3.91.192/28	10.3.91.193 – 10.3.91.206	10.3.91.207
190	10.3.91.208/28	10.3.91.209 – 10.3.91.222	10.3.91.223
191	10.3.91.224/28	10.3.91.225 – 10.3.91.238	10.3.91.239
192	10.3.91.240/28	10.3.91.241 – 10.3.91.254	10.3.91.255
193	10.3.92.0/28	10.3.92.1 – 10.3.92.14	10.3.92.15
194	10.3.92.16/28	10.3.92.17 – 10.3.92.30	10.3.92.31
195	10.3.92.32/28	10.3.92.33 – 10.3.92.46	10.3.92.47
196	10.3.92.48/28	10.3.92.49 – 10.3.92.62	10.3.92.63
197	10.3.92.64/28	10.3.92.65 – 10.3.92.78	10.3.92.79
198	10.3.92.80/28	10.3.92.81 – 10.3.92.94	10.3.92.95
199	10.3.92.96/28	10.3.92.97 – 10.3.92.110	10.3.92.111
200	10.3.92.112/28	10.3.92.113 – 10.3.92.126	10.3.92.127
201	10.3.92.128/28	10.3.92.129 – 10.3.92.142	10.3.92.143
202	10.3.92.144/28	10.3.92.145 – 10.3.92.158	10.3.92.159
203	10.3.92.160/28	10.3.92.161 – 10.3.92.174	10.3.92.175
204	10.3.92.176/28	10.3.92.177 – 10.3.92.190	10.3.92.191
205	10.3.92.192/28	10.3.92.193 – 10.3.92.206	10.3.92.207
206	10.3.92.208/28	10.3.92.209 – 10.3.92.222	10.3.92.223
207	10.3.92.224/28	10.3.92.225 – 10.3.92.238	10.3.92.239
208	10.3.92.240/28	10.3.92.241 – 10.3.92.254	10.3.92.255
209	10.3.93.0/28	10.3.93.1 – 10.3.93.14	10.3.93.15
210	10.3.93.16/28	10.3.93.17 – 10.3.93.30	10.3.93.31
211	10.3.93.32/28	10.3.93.33 – 10.3.93.46	10.3.93.47
212	10.3.93.48/28	10.3.93.49 – 10.3.93.62	10.3.93.63
213	10.3.93.64/28	10.3.93.65 – 10.3.93.78	10.3.93.79
214	10.3.93.80/28	10.3.93.81 – 10.3.93.94	10.3.93.95
215	10.3.93.96/28	10.3.93.97 – 10.3.93.110	10.3.93.111
216	10.3.93.112/28	10.3.93.113 – 10.3.93.126	10.3.93.127
217	10.3.93.128/28	10.3.93.129 – 10.3.93.142	10.3.93.143
218	10.3.93.144/28	10.3.93.145 – 10.3.93.158	10.3.93.159
219	10.3.93.160/28	10.3.93.161 – 10.3.93.174	10.3.93.175
220	10.3.93.176/28	10.3.93.177 – 10.3.93.190	10.3.93.191
221	10.3.93.192/28	10.3.93.193 – 10.3.93.206	10.3.93.207
222	10.3.93.208/28	10.3.93.209 – 10.3.93.222	10.3.93.223
223	10.3.93.224/28	10.3.93.225 – 10.3.93.238	10.3.93.239
224	10.3.93.240/28	10.3.93.241 – 10.3.93.254	10.3.93.255
225	10.3.94.0/28	10.3.94.1 – 10.3.94.14	10.3.94.15
226	10.3.94.16/28	10.3.94.17 – 10.3.94.30	10.3.94.31
227	10.3.94.32/28	10.3.94.33 – 10.3.94.46	10.3.94.47
228	10.3.94.48/28	10.3.94.49 – 10.3.94.62	10.3.94.63
229	10.3.94.64/28	10.3.94.65 – 10.3.94.78	10.3.94.79
230	10.3.94.80/28	10.3.94.81 – 10.3.94.94	10.3.94.95
231	10.3.94.96/28	10.3.94.97 – 10.3.94.110	10.3.94.111
232	10.3.94.112/28	10.3.94.113 – 10.3.94.126	10.3.94.127
233	10.3.94.128/28	10.3.94.129 – 10.3.94.142	10.3.94.143
234	10.3.94.144/28	10.3.94.145 – 10.3.94.158	10.3.94.159
235	10.3.94.160/28	10.3.94.161 – 10.3.94.174	10.3.94.175
236	10.3.94.176/28	10.3.94.177 – 10.3.94.190	10.3.94.191
237	10.3.94.192/28	10.3.94.193 – 10.3.94.206	10.3.94.207
238	10.3.94.208/28	10.3.94.209 – 10.3.94.222	10.3.94.223
239	10.3.94.224/28	10.3.94.225 – 10.3.94.238	10.3.94.239
240	10.3.94.240/28	10.3.94.241 – 10.3.94.254	10.3.94.255
241	10.3.95.0/28	10.3.95.1 – 10.3.95.14	10.3.95.15
242	10.3.95.16/28	10.3.95.17 – 10.3.95.30	10.3.95.31
243	10.3.95.32/28	10.3.95.33 – 10.3.95.46	10.3.95.47
244	10.3.95.48/28	10.3.95.49 – 10.3.95.62	10.3.95.63
245	10.3.95.64/28	10.3.95.65 – 10.3.95.78	10.3.95.79
246	10.3.95.80/28	10.3.95.81 – 10.3.95.94	10.3.95.95
247	10.3.95.96/28	10.3.95.97 – 10.3.95.110	10.3.95.111
248	10.3.95.112/28	10.3.95.113 – 10.3.95.126	10.3.95.127
249	10.3.95.128/28	10.3.95.129 – 10.3.95.142	10.3.95.143
250	10.3.95.144/28	10.3.95.145 – 10.3.95.158	10.3.95.159
251	10.3.95.160/28	10.3.95.161 – 10.3.95.174	10.3.95.175
252	10.3.95.176/28	10.3.95.177 – 10.3.95.190	10.3.95.191
253	10.3.95.192/28	10.3.95.193 – 10.3.95.206	10.3.95.207
254	10.3.95.208/28	10.3.95.209 – 10.3.95.222	10.3.95.223
255	10.3.95.224/28	10.3.95.225 – 10.3.95.238	10.3.95.239
256	10.3.95.240/28	10.3.95.241 – 10.3.95.254	10.3.95.255

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 →