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)10.71.64.0/18

network10.71.64.0/18

broadcast10.71.127.255

first host10.71.64.1

last host10.71.127.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.71.64.0/18

address00001010.01000111.01000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.01000111.01000000.00000000

broadcast00001010.01000111.01111111.11111111

green = network part, grey = host part

hex0x0a474000

decimal172441600

reverse dns0.64.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:4000

/18 split into /28 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.71.64.0/28	10.71.64.1 – 10.71.64.14	10.71.64.15
2	10.71.64.16/28	10.71.64.17 – 10.71.64.30	10.71.64.31
3	10.71.64.32/28	10.71.64.33 – 10.71.64.46	10.71.64.47
4	10.71.64.48/28	10.71.64.49 – 10.71.64.62	10.71.64.63
5	10.71.64.64/28	10.71.64.65 – 10.71.64.78	10.71.64.79
6	10.71.64.80/28	10.71.64.81 – 10.71.64.94	10.71.64.95
7	10.71.64.96/28	10.71.64.97 – 10.71.64.110	10.71.64.111
8	10.71.64.112/28	10.71.64.113 – 10.71.64.126	10.71.64.127
9	10.71.64.128/28	10.71.64.129 – 10.71.64.142	10.71.64.143
10	10.71.64.144/28	10.71.64.145 – 10.71.64.158	10.71.64.159
11	10.71.64.160/28	10.71.64.161 – 10.71.64.174	10.71.64.175
12	10.71.64.176/28	10.71.64.177 – 10.71.64.190	10.71.64.191
13	10.71.64.192/28	10.71.64.193 – 10.71.64.206	10.71.64.207
14	10.71.64.208/28	10.71.64.209 – 10.71.64.222	10.71.64.223
15	10.71.64.224/28	10.71.64.225 – 10.71.64.238	10.71.64.239
16	10.71.64.240/28	10.71.64.241 – 10.71.64.254	10.71.64.255
17	10.71.65.0/28	10.71.65.1 – 10.71.65.14	10.71.65.15
18	10.71.65.16/28	10.71.65.17 – 10.71.65.30	10.71.65.31
19	10.71.65.32/28	10.71.65.33 – 10.71.65.46	10.71.65.47
20	10.71.65.48/28	10.71.65.49 – 10.71.65.62	10.71.65.63
21	10.71.65.64/28	10.71.65.65 – 10.71.65.78	10.71.65.79
22	10.71.65.80/28	10.71.65.81 – 10.71.65.94	10.71.65.95
23	10.71.65.96/28	10.71.65.97 – 10.71.65.110	10.71.65.111
24	10.71.65.112/28	10.71.65.113 – 10.71.65.126	10.71.65.127
25	10.71.65.128/28	10.71.65.129 – 10.71.65.142	10.71.65.143
26	10.71.65.144/28	10.71.65.145 – 10.71.65.158	10.71.65.159
27	10.71.65.160/28	10.71.65.161 – 10.71.65.174	10.71.65.175
28	10.71.65.176/28	10.71.65.177 – 10.71.65.190	10.71.65.191
29	10.71.65.192/28	10.71.65.193 – 10.71.65.206	10.71.65.207
30	10.71.65.208/28	10.71.65.209 – 10.71.65.222	10.71.65.223
31	10.71.65.224/28	10.71.65.225 – 10.71.65.238	10.71.65.239
32	10.71.65.240/28	10.71.65.241 – 10.71.65.254	10.71.65.255
33	10.71.66.0/28	10.71.66.1 – 10.71.66.14	10.71.66.15
34	10.71.66.16/28	10.71.66.17 – 10.71.66.30	10.71.66.31
35	10.71.66.32/28	10.71.66.33 – 10.71.66.46	10.71.66.47
36	10.71.66.48/28	10.71.66.49 – 10.71.66.62	10.71.66.63
37	10.71.66.64/28	10.71.66.65 – 10.71.66.78	10.71.66.79
38	10.71.66.80/28	10.71.66.81 – 10.71.66.94	10.71.66.95
39	10.71.66.96/28	10.71.66.97 – 10.71.66.110	10.71.66.111
40	10.71.66.112/28	10.71.66.113 – 10.71.66.126	10.71.66.127
41	10.71.66.128/28	10.71.66.129 – 10.71.66.142	10.71.66.143
42	10.71.66.144/28	10.71.66.145 – 10.71.66.158	10.71.66.159
43	10.71.66.160/28	10.71.66.161 – 10.71.66.174	10.71.66.175
44	10.71.66.176/28	10.71.66.177 – 10.71.66.190	10.71.66.191
45	10.71.66.192/28	10.71.66.193 – 10.71.66.206	10.71.66.207
46	10.71.66.208/28	10.71.66.209 – 10.71.66.222	10.71.66.223
47	10.71.66.224/28	10.71.66.225 – 10.71.66.238	10.71.66.239
48	10.71.66.240/28	10.71.66.241 – 10.71.66.254	10.71.66.255
49	10.71.67.0/28	10.71.67.1 – 10.71.67.14	10.71.67.15
50	10.71.67.16/28	10.71.67.17 – 10.71.67.30	10.71.67.31
51	10.71.67.32/28	10.71.67.33 – 10.71.67.46	10.71.67.47
52	10.71.67.48/28	10.71.67.49 – 10.71.67.62	10.71.67.63
53	10.71.67.64/28	10.71.67.65 – 10.71.67.78	10.71.67.79
54	10.71.67.80/28	10.71.67.81 – 10.71.67.94	10.71.67.95
55	10.71.67.96/28	10.71.67.97 – 10.71.67.110	10.71.67.111
56	10.71.67.112/28	10.71.67.113 – 10.71.67.126	10.71.67.127
57	10.71.67.128/28	10.71.67.129 – 10.71.67.142	10.71.67.143
58	10.71.67.144/28	10.71.67.145 – 10.71.67.158	10.71.67.159
59	10.71.67.160/28	10.71.67.161 – 10.71.67.174	10.71.67.175
60	10.71.67.176/28	10.71.67.177 – 10.71.67.190	10.71.67.191
61	10.71.67.192/28	10.71.67.193 – 10.71.67.206	10.71.67.207
62	10.71.67.208/28	10.71.67.209 – 10.71.67.222	10.71.67.223
63	10.71.67.224/28	10.71.67.225 – 10.71.67.238	10.71.67.239
64	10.71.67.240/28	10.71.67.241 – 10.71.67.254	10.71.67.255
65	10.71.68.0/28	10.71.68.1 – 10.71.68.14	10.71.68.15
66	10.71.68.16/28	10.71.68.17 – 10.71.68.30	10.71.68.31
67	10.71.68.32/28	10.71.68.33 – 10.71.68.46	10.71.68.47
68	10.71.68.48/28	10.71.68.49 – 10.71.68.62	10.71.68.63
69	10.71.68.64/28	10.71.68.65 – 10.71.68.78	10.71.68.79
70	10.71.68.80/28	10.71.68.81 – 10.71.68.94	10.71.68.95
71	10.71.68.96/28	10.71.68.97 – 10.71.68.110	10.71.68.111
72	10.71.68.112/28	10.71.68.113 – 10.71.68.126	10.71.68.127
73	10.71.68.128/28	10.71.68.129 – 10.71.68.142	10.71.68.143
74	10.71.68.144/28	10.71.68.145 – 10.71.68.158	10.71.68.159
75	10.71.68.160/28	10.71.68.161 – 10.71.68.174	10.71.68.175
76	10.71.68.176/28	10.71.68.177 – 10.71.68.190	10.71.68.191
77	10.71.68.192/28	10.71.68.193 – 10.71.68.206	10.71.68.207
78	10.71.68.208/28	10.71.68.209 – 10.71.68.222	10.71.68.223
79	10.71.68.224/28	10.71.68.225 – 10.71.68.238	10.71.68.239
80	10.71.68.240/28	10.71.68.241 – 10.71.68.254	10.71.68.255
81	10.71.69.0/28	10.71.69.1 – 10.71.69.14	10.71.69.15
82	10.71.69.16/28	10.71.69.17 – 10.71.69.30	10.71.69.31
83	10.71.69.32/28	10.71.69.33 – 10.71.69.46	10.71.69.47
84	10.71.69.48/28	10.71.69.49 – 10.71.69.62	10.71.69.63
85	10.71.69.64/28	10.71.69.65 – 10.71.69.78	10.71.69.79
86	10.71.69.80/28	10.71.69.81 – 10.71.69.94	10.71.69.95
87	10.71.69.96/28	10.71.69.97 – 10.71.69.110	10.71.69.111
88	10.71.69.112/28	10.71.69.113 – 10.71.69.126	10.71.69.127
89	10.71.69.128/28	10.71.69.129 – 10.71.69.142	10.71.69.143
90	10.71.69.144/28	10.71.69.145 – 10.71.69.158	10.71.69.159
91	10.71.69.160/28	10.71.69.161 – 10.71.69.174	10.71.69.175
92	10.71.69.176/28	10.71.69.177 – 10.71.69.190	10.71.69.191
93	10.71.69.192/28	10.71.69.193 – 10.71.69.206	10.71.69.207
94	10.71.69.208/28	10.71.69.209 – 10.71.69.222	10.71.69.223
95	10.71.69.224/28	10.71.69.225 – 10.71.69.238	10.71.69.239
96	10.71.69.240/28	10.71.69.241 – 10.71.69.254	10.71.69.255
97	10.71.70.0/28	10.71.70.1 – 10.71.70.14	10.71.70.15
98	10.71.70.16/28	10.71.70.17 – 10.71.70.30	10.71.70.31
99	10.71.70.32/28	10.71.70.33 – 10.71.70.46	10.71.70.47
100	10.71.70.48/28	10.71.70.49 – 10.71.70.62	10.71.70.63
101	10.71.70.64/28	10.71.70.65 – 10.71.70.78	10.71.70.79
102	10.71.70.80/28	10.71.70.81 – 10.71.70.94	10.71.70.95
103	10.71.70.96/28	10.71.70.97 – 10.71.70.110	10.71.70.111
104	10.71.70.112/28	10.71.70.113 – 10.71.70.126	10.71.70.127
105	10.71.70.128/28	10.71.70.129 – 10.71.70.142	10.71.70.143
106	10.71.70.144/28	10.71.70.145 – 10.71.70.158	10.71.70.159
107	10.71.70.160/28	10.71.70.161 – 10.71.70.174	10.71.70.175
108	10.71.70.176/28	10.71.70.177 – 10.71.70.190	10.71.70.191
109	10.71.70.192/28	10.71.70.193 – 10.71.70.206	10.71.70.207
110	10.71.70.208/28	10.71.70.209 – 10.71.70.222	10.71.70.223
111	10.71.70.224/28	10.71.70.225 – 10.71.70.238	10.71.70.239
112	10.71.70.240/28	10.71.70.241 – 10.71.70.254	10.71.70.255
113	10.71.71.0/28	10.71.71.1 – 10.71.71.14	10.71.71.15
114	10.71.71.16/28	10.71.71.17 – 10.71.71.30	10.71.71.31
115	10.71.71.32/28	10.71.71.33 – 10.71.71.46	10.71.71.47
116	10.71.71.48/28	10.71.71.49 – 10.71.71.62	10.71.71.63
117	10.71.71.64/28	10.71.71.65 – 10.71.71.78	10.71.71.79
118	10.71.71.80/28	10.71.71.81 – 10.71.71.94	10.71.71.95
119	10.71.71.96/28	10.71.71.97 – 10.71.71.110	10.71.71.111
120	10.71.71.112/28	10.71.71.113 – 10.71.71.126	10.71.71.127
121	10.71.71.128/28	10.71.71.129 – 10.71.71.142	10.71.71.143
122	10.71.71.144/28	10.71.71.145 – 10.71.71.158	10.71.71.159
123	10.71.71.160/28	10.71.71.161 – 10.71.71.174	10.71.71.175
124	10.71.71.176/28	10.71.71.177 – 10.71.71.190	10.71.71.191
125	10.71.71.192/28	10.71.71.193 – 10.71.71.206	10.71.71.207
126	10.71.71.208/28	10.71.71.209 – 10.71.71.222	10.71.71.223
127	10.71.71.224/28	10.71.71.225 – 10.71.71.238	10.71.71.239
128	10.71.71.240/28	10.71.71.241 – 10.71.71.254	10.71.71.255
129	10.71.72.0/28	10.71.72.1 – 10.71.72.14	10.71.72.15
130	10.71.72.16/28	10.71.72.17 – 10.71.72.30	10.71.72.31
131	10.71.72.32/28	10.71.72.33 – 10.71.72.46	10.71.72.47
132	10.71.72.48/28	10.71.72.49 – 10.71.72.62	10.71.72.63
133	10.71.72.64/28	10.71.72.65 – 10.71.72.78	10.71.72.79
134	10.71.72.80/28	10.71.72.81 – 10.71.72.94	10.71.72.95
135	10.71.72.96/28	10.71.72.97 – 10.71.72.110	10.71.72.111
136	10.71.72.112/28	10.71.72.113 – 10.71.72.126	10.71.72.127
137	10.71.72.128/28	10.71.72.129 – 10.71.72.142	10.71.72.143
138	10.71.72.144/28	10.71.72.145 – 10.71.72.158	10.71.72.159
139	10.71.72.160/28	10.71.72.161 – 10.71.72.174	10.71.72.175
140	10.71.72.176/28	10.71.72.177 – 10.71.72.190	10.71.72.191
141	10.71.72.192/28	10.71.72.193 – 10.71.72.206	10.71.72.207
142	10.71.72.208/28	10.71.72.209 – 10.71.72.222	10.71.72.223
143	10.71.72.224/28	10.71.72.225 – 10.71.72.238	10.71.72.239
144	10.71.72.240/28	10.71.72.241 – 10.71.72.254	10.71.72.255
145	10.71.73.0/28	10.71.73.1 – 10.71.73.14	10.71.73.15
146	10.71.73.16/28	10.71.73.17 – 10.71.73.30	10.71.73.31
147	10.71.73.32/28	10.71.73.33 – 10.71.73.46	10.71.73.47
148	10.71.73.48/28	10.71.73.49 – 10.71.73.62	10.71.73.63
149	10.71.73.64/28	10.71.73.65 – 10.71.73.78	10.71.73.79
150	10.71.73.80/28	10.71.73.81 – 10.71.73.94	10.71.73.95
151	10.71.73.96/28	10.71.73.97 – 10.71.73.110	10.71.73.111
152	10.71.73.112/28	10.71.73.113 – 10.71.73.126	10.71.73.127
153	10.71.73.128/28	10.71.73.129 – 10.71.73.142	10.71.73.143
154	10.71.73.144/28	10.71.73.145 – 10.71.73.158	10.71.73.159
155	10.71.73.160/28	10.71.73.161 – 10.71.73.174	10.71.73.175
156	10.71.73.176/28	10.71.73.177 – 10.71.73.190	10.71.73.191
157	10.71.73.192/28	10.71.73.193 – 10.71.73.206	10.71.73.207
158	10.71.73.208/28	10.71.73.209 – 10.71.73.222	10.71.73.223
159	10.71.73.224/28	10.71.73.225 – 10.71.73.238	10.71.73.239
160	10.71.73.240/28	10.71.73.241 – 10.71.73.254	10.71.73.255
161	10.71.74.0/28	10.71.74.1 – 10.71.74.14	10.71.74.15
162	10.71.74.16/28	10.71.74.17 – 10.71.74.30	10.71.74.31
163	10.71.74.32/28	10.71.74.33 – 10.71.74.46	10.71.74.47
164	10.71.74.48/28	10.71.74.49 – 10.71.74.62	10.71.74.63
165	10.71.74.64/28	10.71.74.65 – 10.71.74.78	10.71.74.79
166	10.71.74.80/28	10.71.74.81 – 10.71.74.94	10.71.74.95
167	10.71.74.96/28	10.71.74.97 – 10.71.74.110	10.71.74.111
168	10.71.74.112/28	10.71.74.113 – 10.71.74.126	10.71.74.127
169	10.71.74.128/28	10.71.74.129 – 10.71.74.142	10.71.74.143
170	10.71.74.144/28	10.71.74.145 – 10.71.74.158	10.71.74.159
171	10.71.74.160/28	10.71.74.161 – 10.71.74.174	10.71.74.175
172	10.71.74.176/28	10.71.74.177 – 10.71.74.190	10.71.74.191
173	10.71.74.192/28	10.71.74.193 – 10.71.74.206	10.71.74.207
174	10.71.74.208/28	10.71.74.209 – 10.71.74.222	10.71.74.223
175	10.71.74.224/28	10.71.74.225 – 10.71.74.238	10.71.74.239
176	10.71.74.240/28	10.71.74.241 – 10.71.74.254	10.71.74.255
177	10.71.75.0/28	10.71.75.1 – 10.71.75.14	10.71.75.15
178	10.71.75.16/28	10.71.75.17 – 10.71.75.30	10.71.75.31
179	10.71.75.32/28	10.71.75.33 – 10.71.75.46	10.71.75.47
180	10.71.75.48/28	10.71.75.49 – 10.71.75.62	10.71.75.63
181	10.71.75.64/28	10.71.75.65 – 10.71.75.78	10.71.75.79
182	10.71.75.80/28	10.71.75.81 – 10.71.75.94	10.71.75.95
183	10.71.75.96/28	10.71.75.97 – 10.71.75.110	10.71.75.111
184	10.71.75.112/28	10.71.75.113 – 10.71.75.126	10.71.75.127
185	10.71.75.128/28	10.71.75.129 – 10.71.75.142	10.71.75.143
186	10.71.75.144/28	10.71.75.145 – 10.71.75.158	10.71.75.159
187	10.71.75.160/28	10.71.75.161 – 10.71.75.174	10.71.75.175
188	10.71.75.176/28	10.71.75.177 – 10.71.75.190	10.71.75.191
189	10.71.75.192/28	10.71.75.193 – 10.71.75.206	10.71.75.207
190	10.71.75.208/28	10.71.75.209 – 10.71.75.222	10.71.75.223
191	10.71.75.224/28	10.71.75.225 – 10.71.75.238	10.71.75.239
192	10.71.75.240/28	10.71.75.241 – 10.71.75.254	10.71.75.255
193	10.71.76.0/28	10.71.76.1 – 10.71.76.14	10.71.76.15
194	10.71.76.16/28	10.71.76.17 – 10.71.76.30	10.71.76.31
195	10.71.76.32/28	10.71.76.33 – 10.71.76.46	10.71.76.47
196	10.71.76.48/28	10.71.76.49 – 10.71.76.62	10.71.76.63
197	10.71.76.64/28	10.71.76.65 – 10.71.76.78	10.71.76.79
198	10.71.76.80/28	10.71.76.81 – 10.71.76.94	10.71.76.95
199	10.71.76.96/28	10.71.76.97 – 10.71.76.110	10.71.76.111
200	10.71.76.112/28	10.71.76.113 – 10.71.76.126	10.71.76.127
201	10.71.76.128/28	10.71.76.129 – 10.71.76.142	10.71.76.143
202	10.71.76.144/28	10.71.76.145 – 10.71.76.158	10.71.76.159
203	10.71.76.160/28	10.71.76.161 – 10.71.76.174	10.71.76.175
204	10.71.76.176/28	10.71.76.177 – 10.71.76.190	10.71.76.191
205	10.71.76.192/28	10.71.76.193 – 10.71.76.206	10.71.76.207
206	10.71.76.208/28	10.71.76.209 – 10.71.76.222	10.71.76.223
207	10.71.76.224/28	10.71.76.225 – 10.71.76.238	10.71.76.239
208	10.71.76.240/28	10.71.76.241 – 10.71.76.254	10.71.76.255
209	10.71.77.0/28	10.71.77.1 – 10.71.77.14	10.71.77.15
210	10.71.77.16/28	10.71.77.17 – 10.71.77.30	10.71.77.31
211	10.71.77.32/28	10.71.77.33 – 10.71.77.46	10.71.77.47
212	10.71.77.48/28	10.71.77.49 – 10.71.77.62	10.71.77.63
213	10.71.77.64/28	10.71.77.65 – 10.71.77.78	10.71.77.79
214	10.71.77.80/28	10.71.77.81 – 10.71.77.94	10.71.77.95
215	10.71.77.96/28	10.71.77.97 – 10.71.77.110	10.71.77.111
216	10.71.77.112/28	10.71.77.113 – 10.71.77.126	10.71.77.127
217	10.71.77.128/28	10.71.77.129 – 10.71.77.142	10.71.77.143
218	10.71.77.144/28	10.71.77.145 – 10.71.77.158	10.71.77.159
219	10.71.77.160/28	10.71.77.161 – 10.71.77.174	10.71.77.175
220	10.71.77.176/28	10.71.77.177 – 10.71.77.190	10.71.77.191
221	10.71.77.192/28	10.71.77.193 – 10.71.77.206	10.71.77.207
222	10.71.77.208/28	10.71.77.209 – 10.71.77.222	10.71.77.223
223	10.71.77.224/28	10.71.77.225 – 10.71.77.238	10.71.77.239
224	10.71.77.240/28	10.71.77.241 – 10.71.77.254	10.71.77.255
225	10.71.78.0/28	10.71.78.1 – 10.71.78.14	10.71.78.15
226	10.71.78.16/28	10.71.78.17 – 10.71.78.30	10.71.78.31
227	10.71.78.32/28	10.71.78.33 – 10.71.78.46	10.71.78.47
228	10.71.78.48/28	10.71.78.49 – 10.71.78.62	10.71.78.63
229	10.71.78.64/28	10.71.78.65 – 10.71.78.78	10.71.78.79
230	10.71.78.80/28	10.71.78.81 – 10.71.78.94	10.71.78.95
231	10.71.78.96/28	10.71.78.97 – 10.71.78.110	10.71.78.111
232	10.71.78.112/28	10.71.78.113 – 10.71.78.126	10.71.78.127
233	10.71.78.128/28	10.71.78.129 – 10.71.78.142	10.71.78.143
234	10.71.78.144/28	10.71.78.145 – 10.71.78.158	10.71.78.159
235	10.71.78.160/28	10.71.78.161 – 10.71.78.174	10.71.78.175
236	10.71.78.176/28	10.71.78.177 – 10.71.78.190	10.71.78.191
237	10.71.78.192/28	10.71.78.193 – 10.71.78.206	10.71.78.207
238	10.71.78.208/28	10.71.78.209 – 10.71.78.222	10.71.78.223
239	10.71.78.224/28	10.71.78.225 – 10.71.78.238	10.71.78.239
240	10.71.78.240/28	10.71.78.241 – 10.71.78.254	10.71.78.255
241	10.71.79.0/28	10.71.79.1 – 10.71.79.14	10.71.79.15
242	10.71.79.16/28	10.71.79.17 – 10.71.79.30	10.71.79.31
243	10.71.79.32/28	10.71.79.33 – 10.71.79.46	10.71.79.47
244	10.71.79.48/28	10.71.79.49 – 10.71.79.62	10.71.79.63
245	10.71.79.64/28	10.71.79.65 – 10.71.79.78	10.71.79.79
246	10.71.79.80/28	10.71.79.81 – 10.71.79.94	10.71.79.95
247	10.71.79.96/28	10.71.79.97 – 10.71.79.110	10.71.79.111
248	10.71.79.112/28	10.71.79.113 – 10.71.79.126	10.71.79.127
249	10.71.79.128/28	10.71.79.129 – 10.71.79.142	10.71.79.143
250	10.71.79.144/28	10.71.79.145 – 10.71.79.158	10.71.79.159
251	10.71.79.160/28	10.71.79.161 – 10.71.79.174	10.71.79.175
252	10.71.79.176/28	10.71.79.177 – 10.71.79.190	10.71.79.191
253	10.71.79.192/28	10.71.79.193 – 10.71.79.206	10.71.79.207
254	10.71.79.208/28	10.71.79.209 – 10.71.79.222	10.71.79.223
255	10.71.79.224/28	10.71.79.225 – 10.71.79.238	10.71.79.239
256	10.71.79.240/28	10.71.79.241 – 10.71.79.254	10.71.79.255

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 →