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)10.253.0.0/20

network10.253.0.0/20

broadcast10.253.15.255

first host10.253.0.1

last host10.253.15.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.253.0.0/20

address00001010.11111101.00000000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.11111101.00000000.00000000

broadcast00001010.11111101.00001111.11111111

green = network part, grey = host part

hex0x0afd0000

decimal184352768

reverse dns0.0.253.10.in-addr.arpa

ipv4-mapped::ffff:afd:0

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.253.0.0/28	10.253.0.1 – 10.253.0.14	10.253.0.15
2	10.253.0.16/28	10.253.0.17 – 10.253.0.30	10.253.0.31
3	10.253.0.32/28	10.253.0.33 – 10.253.0.46	10.253.0.47
4	10.253.0.48/28	10.253.0.49 – 10.253.0.62	10.253.0.63
5	10.253.0.64/28	10.253.0.65 – 10.253.0.78	10.253.0.79
6	10.253.0.80/28	10.253.0.81 – 10.253.0.94	10.253.0.95
7	10.253.0.96/28	10.253.0.97 – 10.253.0.110	10.253.0.111
8	10.253.0.112/28	10.253.0.113 – 10.253.0.126	10.253.0.127
9	10.253.0.128/28	10.253.0.129 – 10.253.0.142	10.253.0.143
10	10.253.0.144/28	10.253.0.145 – 10.253.0.158	10.253.0.159
11	10.253.0.160/28	10.253.0.161 – 10.253.0.174	10.253.0.175
12	10.253.0.176/28	10.253.0.177 – 10.253.0.190	10.253.0.191
13	10.253.0.192/28	10.253.0.193 – 10.253.0.206	10.253.0.207
14	10.253.0.208/28	10.253.0.209 – 10.253.0.222	10.253.0.223
15	10.253.0.224/28	10.253.0.225 – 10.253.0.238	10.253.0.239
16	10.253.0.240/28	10.253.0.241 – 10.253.0.254	10.253.0.255
17	10.253.1.0/28	10.253.1.1 – 10.253.1.14	10.253.1.15
18	10.253.1.16/28	10.253.1.17 – 10.253.1.30	10.253.1.31
19	10.253.1.32/28	10.253.1.33 – 10.253.1.46	10.253.1.47
20	10.253.1.48/28	10.253.1.49 – 10.253.1.62	10.253.1.63
21	10.253.1.64/28	10.253.1.65 – 10.253.1.78	10.253.1.79
22	10.253.1.80/28	10.253.1.81 – 10.253.1.94	10.253.1.95
23	10.253.1.96/28	10.253.1.97 – 10.253.1.110	10.253.1.111
24	10.253.1.112/28	10.253.1.113 – 10.253.1.126	10.253.1.127
25	10.253.1.128/28	10.253.1.129 – 10.253.1.142	10.253.1.143
26	10.253.1.144/28	10.253.1.145 – 10.253.1.158	10.253.1.159
27	10.253.1.160/28	10.253.1.161 – 10.253.1.174	10.253.1.175
28	10.253.1.176/28	10.253.1.177 – 10.253.1.190	10.253.1.191
29	10.253.1.192/28	10.253.1.193 – 10.253.1.206	10.253.1.207
30	10.253.1.208/28	10.253.1.209 – 10.253.1.222	10.253.1.223
31	10.253.1.224/28	10.253.1.225 – 10.253.1.238	10.253.1.239
32	10.253.1.240/28	10.253.1.241 – 10.253.1.254	10.253.1.255
33	10.253.2.0/28	10.253.2.1 – 10.253.2.14	10.253.2.15
34	10.253.2.16/28	10.253.2.17 – 10.253.2.30	10.253.2.31
35	10.253.2.32/28	10.253.2.33 – 10.253.2.46	10.253.2.47
36	10.253.2.48/28	10.253.2.49 – 10.253.2.62	10.253.2.63
37	10.253.2.64/28	10.253.2.65 – 10.253.2.78	10.253.2.79
38	10.253.2.80/28	10.253.2.81 – 10.253.2.94	10.253.2.95
39	10.253.2.96/28	10.253.2.97 – 10.253.2.110	10.253.2.111
40	10.253.2.112/28	10.253.2.113 – 10.253.2.126	10.253.2.127
41	10.253.2.128/28	10.253.2.129 – 10.253.2.142	10.253.2.143
42	10.253.2.144/28	10.253.2.145 – 10.253.2.158	10.253.2.159
43	10.253.2.160/28	10.253.2.161 – 10.253.2.174	10.253.2.175
44	10.253.2.176/28	10.253.2.177 – 10.253.2.190	10.253.2.191
45	10.253.2.192/28	10.253.2.193 – 10.253.2.206	10.253.2.207
46	10.253.2.208/28	10.253.2.209 – 10.253.2.222	10.253.2.223
47	10.253.2.224/28	10.253.2.225 – 10.253.2.238	10.253.2.239
48	10.253.2.240/28	10.253.2.241 – 10.253.2.254	10.253.2.255
49	10.253.3.0/28	10.253.3.1 – 10.253.3.14	10.253.3.15
50	10.253.3.16/28	10.253.3.17 – 10.253.3.30	10.253.3.31
51	10.253.3.32/28	10.253.3.33 – 10.253.3.46	10.253.3.47
52	10.253.3.48/28	10.253.3.49 – 10.253.3.62	10.253.3.63
53	10.253.3.64/28	10.253.3.65 – 10.253.3.78	10.253.3.79
54	10.253.3.80/28	10.253.3.81 – 10.253.3.94	10.253.3.95
55	10.253.3.96/28	10.253.3.97 – 10.253.3.110	10.253.3.111
56	10.253.3.112/28	10.253.3.113 – 10.253.3.126	10.253.3.127
57	10.253.3.128/28	10.253.3.129 – 10.253.3.142	10.253.3.143
58	10.253.3.144/28	10.253.3.145 – 10.253.3.158	10.253.3.159
59	10.253.3.160/28	10.253.3.161 – 10.253.3.174	10.253.3.175
60	10.253.3.176/28	10.253.3.177 – 10.253.3.190	10.253.3.191
61	10.253.3.192/28	10.253.3.193 – 10.253.3.206	10.253.3.207
62	10.253.3.208/28	10.253.3.209 – 10.253.3.222	10.253.3.223
63	10.253.3.224/28	10.253.3.225 – 10.253.3.238	10.253.3.239
64	10.253.3.240/28	10.253.3.241 – 10.253.3.254	10.253.3.255
65	10.253.4.0/28	10.253.4.1 – 10.253.4.14	10.253.4.15
66	10.253.4.16/28	10.253.4.17 – 10.253.4.30	10.253.4.31
67	10.253.4.32/28	10.253.4.33 – 10.253.4.46	10.253.4.47
68	10.253.4.48/28	10.253.4.49 – 10.253.4.62	10.253.4.63
69	10.253.4.64/28	10.253.4.65 – 10.253.4.78	10.253.4.79
70	10.253.4.80/28	10.253.4.81 – 10.253.4.94	10.253.4.95
71	10.253.4.96/28	10.253.4.97 – 10.253.4.110	10.253.4.111
72	10.253.4.112/28	10.253.4.113 – 10.253.4.126	10.253.4.127
73	10.253.4.128/28	10.253.4.129 – 10.253.4.142	10.253.4.143
74	10.253.4.144/28	10.253.4.145 – 10.253.4.158	10.253.4.159
75	10.253.4.160/28	10.253.4.161 – 10.253.4.174	10.253.4.175
76	10.253.4.176/28	10.253.4.177 – 10.253.4.190	10.253.4.191
77	10.253.4.192/28	10.253.4.193 – 10.253.4.206	10.253.4.207
78	10.253.4.208/28	10.253.4.209 – 10.253.4.222	10.253.4.223
79	10.253.4.224/28	10.253.4.225 – 10.253.4.238	10.253.4.239
80	10.253.4.240/28	10.253.4.241 – 10.253.4.254	10.253.4.255
81	10.253.5.0/28	10.253.5.1 – 10.253.5.14	10.253.5.15
82	10.253.5.16/28	10.253.5.17 – 10.253.5.30	10.253.5.31
83	10.253.5.32/28	10.253.5.33 – 10.253.5.46	10.253.5.47
84	10.253.5.48/28	10.253.5.49 – 10.253.5.62	10.253.5.63
85	10.253.5.64/28	10.253.5.65 – 10.253.5.78	10.253.5.79
86	10.253.5.80/28	10.253.5.81 – 10.253.5.94	10.253.5.95
87	10.253.5.96/28	10.253.5.97 – 10.253.5.110	10.253.5.111
88	10.253.5.112/28	10.253.5.113 – 10.253.5.126	10.253.5.127
89	10.253.5.128/28	10.253.5.129 – 10.253.5.142	10.253.5.143
90	10.253.5.144/28	10.253.5.145 – 10.253.5.158	10.253.5.159
91	10.253.5.160/28	10.253.5.161 – 10.253.5.174	10.253.5.175
92	10.253.5.176/28	10.253.5.177 – 10.253.5.190	10.253.5.191
93	10.253.5.192/28	10.253.5.193 – 10.253.5.206	10.253.5.207
94	10.253.5.208/28	10.253.5.209 – 10.253.5.222	10.253.5.223
95	10.253.5.224/28	10.253.5.225 – 10.253.5.238	10.253.5.239
96	10.253.5.240/28	10.253.5.241 – 10.253.5.254	10.253.5.255
97	10.253.6.0/28	10.253.6.1 – 10.253.6.14	10.253.6.15
98	10.253.6.16/28	10.253.6.17 – 10.253.6.30	10.253.6.31
99	10.253.6.32/28	10.253.6.33 – 10.253.6.46	10.253.6.47
100	10.253.6.48/28	10.253.6.49 – 10.253.6.62	10.253.6.63
101	10.253.6.64/28	10.253.6.65 – 10.253.6.78	10.253.6.79
102	10.253.6.80/28	10.253.6.81 – 10.253.6.94	10.253.6.95
103	10.253.6.96/28	10.253.6.97 – 10.253.6.110	10.253.6.111
104	10.253.6.112/28	10.253.6.113 – 10.253.6.126	10.253.6.127
105	10.253.6.128/28	10.253.6.129 – 10.253.6.142	10.253.6.143
106	10.253.6.144/28	10.253.6.145 – 10.253.6.158	10.253.6.159
107	10.253.6.160/28	10.253.6.161 – 10.253.6.174	10.253.6.175
108	10.253.6.176/28	10.253.6.177 – 10.253.6.190	10.253.6.191
109	10.253.6.192/28	10.253.6.193 – 10.253.6.206	10.253.6.207
110	10.253.6.208/28	10.253.6.209 – 10.253.6.222	10.253.6.223
111	10.253.6.224/28	10.253.6.225 – 10.253.6.238	10.253.6.239
112	10.253.6.240/28	10.253.6.241 – 10.253.6.254	10.253.6.255
113	10.253.7.0/28	10.253.7.1 – 10.253.7.14	10.253.7.15
114	10.253.7.16/28	10.253.7.17 – 10.253.7.30	10.253.7.31
115	10.253.7.32/28	10.253.7.33 – 10.253.7.46	10.253.7.47
116	10.253.7.48/28	10.253.7.49 – 10.253.7.62	10.253.7.63
117	10.253.7.64/28	10.253.7.65 – 10.253.7.78	10.253.7.79
118	10.253.7.80/28	10.253.7.81 – 10.253.7.94	10.253.7.95
119	10.253.7.96/28	10.253.7.97 – 10.253.7.110	10.253.7.111
120	10.253.7.112/28	10.253.7.113 – 10.253.7.126	10.253.7.127
121	10.253.7.128/28	10.253.7.129 – 10.253.7.142	10.253.7.143
122	10.253.7.144/28	10.253.7.145 – 10.253.7.158	10.253.7.159
123	10.253.7.160/28	10.253.7.161 – 10.253.7.174	10.253.7.175
124	10.253.7.176/28	10.253.7.177 – 10.253.7.190	10.253.7.191
125	10.253.7.192/28	10.253.7.193 – 10.253.7.206	10.253.7.207
126	10.253.7.208/28	10.253.7.209 – 10.253.7.222	10.253.7.223
127	10.253.7.224/28	10.253.7.225 – 10.253.7.238	10.253.7.239
128	10.253.7.240/28	10.253.7.241 – 10.253.7.254	10.253.7.255
129	10.253.8.0/28	10.253.8.1 – 10.253.8.14	10.253.8.15
130	10.253.8.16/28	10.253.8.17 – 10.253.8.30	10.253.8.31
131	10.253.8.32/28	10.253.8.33 – 10.253.8.46	10.253.8.47
132	10.253.8.48/28	10.253.8.49 – 10.253.8.62	10.253.8.63
133	10.253.8.64/28	10.253.8.65 – 10.253.8.78	10.253.8.79
134	10.253.8.80/28	10.253.8.81 – 10.253.8.94	10.253.8.95
135	10.253.8.96/28	10.253.8.97 – 10.253.8.110	10.253.8.111
136	10.253.8.112/28	10.253.8.113 – 10.253.8.126	10.253.8.127
137	10.253.8.128/28	10.253.8.129 – 10.253.8.142	10.253.8.143
138	10.253.8.144/28	10.253.8.145 – 10.253.8.158	10.253.8.159
139	10.253.8.160/28	10.253.8.161 – 10.253.8.174	10.253.8.175
140	10.253.8.176/28	10.253.8.177 – 10.253.8.190	10.253.8.191
141	10.253.8.192/28	10.253.8.193 – 10.253.8.206	10.253.8.207
142	10.253.8.208/28	10.253.8.209 – 10.253.8.222	10.253.8.223
143	10.253.8.224/28	10.253.8.225 – 10.253.8.238	10.253.8.239
144	10.253.8.240/28	10.253.8.241 – 10.253.8.254	10.253.8.255
145	10.253.9.0/28	10.253.9.1 – 10.253.9.14	10.253.9.15
146	10.253.9.16/28	10.253.9.17 – 10.253.9.30	10.253.9.31
147	10.253.9.32/28	10.253.9.33 – 10.253.9.46	10.253.9.47
148	10.253.9.48/28	10.253.9.49 – 10.253.9.62	10.253.9.63
149	10.253.9.64/28	10.253.9.65 – 10.253.9.78	10.253.9.79
150	10.253.9.80/28	10.253.9.81 – 10.253.9.94	10.253.9.95
151	10.253.9.96/28	10.253.9.97 – 10.253.9.110	10.253.9.111
152	10.253.9.112/28	10.253.9.113 – 10.253.9.126	10.253.9.127
153	10.253.9.128/28	10.253.9.129 – 10.253.9.142	10.253.9.143
154	10.253.9.144/28	10.253.9.145 – 10.253.9.158	10.253.9.159
155	10.253.9.160/28	10.253.9.161 – 10.253.9.174	10.253.9.175
156	10.253.9.176/28	10.253.9.177 – 10.253.9.190	10.253.9.191
157	10.253.9.192/28	10.253.9.193 – 10.253.9.206	10.253.9.207
158	10.253.9.208/28	10.253.9.209 – 10.253.9.222	10.253.9.223
159	10.253.9.224/28	10.253.9.225 – 10.253.9.238	10.253.9.239
160	10.253.9.240/28	10.253.9.241 – 10.253.9.254	10.253.9.255
161	10.253.10.0/28	10.253.10.1 – 10.253.10.14	10.253.10.15
162	10.253.10.16/28	10.253.10.17 – 10.253.10.30	10.253.10.31
163	10.253.10.32/28	10.253.10.33 – 10.253.10.46	10.253.10.47
164	10.253.10.48/28	10.253.10.49 – 10.253.10.62	10.253.10.63
165	10.253.10.64/28	10.253.10.65 – 10.253.10.78	10.253.10.79
166	10.253.10.80/28	10.253.10.81 – 10.253.10.94	10.253.10.95
167	10.253.10.96/28	10.253.10.97 – 10.253.10.110	10.253.10.111
168	10.253.10.112/28	10.253.10.113 – 10.253.10.126	10.253.10.127
169	10.253.10.128/28	10.253.10.129 – 10.253.10.142	10.253.10.143
170	10.253.10.144/28	10.253.10.145 – 10.253.10.158	10.253.10.159
171	10.253.10.160/28	10.253.10.161 – 10.253.10.174	10.253.10.175
172	10.253.10.176/28	10.253.10.177 – 10.253.10.190	10.253.10.191
173	10.253.10.192/28	10.253.10.193 – 10.253.10.206	10.253.10.207
174	10.253.10.208/28	10.253.10.209 – 10.253.10.222	10.253.10.223
175	10.253.10.224/28	10.253.10.225 – 10.253.10.238	10.253.10.239
176	10.253.10.240/28	10.253.10.241 – 10.253.10.254	10.253.10.255
177	10.253.11.0/28	10.253.11.1 – 10.253.11.14	10.253.11.15
178	10.253.11.16/28	10.253.11.17 – 10.253.11.30	10.253.11.31
179	10.253.11.32/28	10.253.11.33 – 10.253.11.46	10.253.11.47
180	10.253.11.48/28	10.253.11.49 – 10.253.11.62	10.253.11.63
181	10.253.11.64/28	10.253.11.65 – 10.253.11.78	10.253.11.79
182	10.253.11.80/28	10.253.11.81 – 10.253.11.94	10.253.11.95
183	10.253.11.96/28	10.253.11.97 – 10.253.11.110	10.253.11.111
184	10.253.11.112/28	10.253.11.113 – 10.253.11.126	10.253.11.127
185	10.253.11.128/28	10.253.11.129 – 10.253.11.142	10.253.11.143
186	10.253.11.144/28	10.253.11.145 – 10.253.11.158	10.253.11.159
187	10.253.11.160/28	10.253.11.161 – 10.253.11.174	10.253.11.175
188	10.253.11.176/28	10.253.11.177 – 10.253.11.190	10.253.11.191
189	10.253.11.192/28	10.253.11.193 – 10.253.11.206	10.253.11.207
190	10.253.11.208/28	10.253.11.209 – 10.253.11.222	10.253.11.223
191	10.253.11.224/28	10.253.11.225 – 10.253.11.238	10.253.11.239
192	10.253.11.240/28	10.253.11.241 – 10.253.11.254	10.253.11.255
193	10.253.12.0/28	10.253.12.1 – 10.253.12.14	10.253.12.15
194	10.253.12.16/28	10.253.12.17 – 10.253.12.30	10.253.12.31
195	10.253.12.32/28	10.253.12.33 – 10.253.12.46	10.253.12.47
196	10.253.12.48/28	10.253.12.49 – 10.253.12.62	10.253.12.63
197	10.253.12.64/28	10.253.12.65 – 10.253.12.78	10.253.12.79
198	10.253.12.80/28	10.253.12.81 – 10.253.12.94	10.253.12.95
199	10.253.12.96/28	10.253.12.97 – 10.253.12.110	10.253.12.111
200	10.253.12.112/28	10.253.12.113 – 10.253.12.126	10.253.12.127
201	10.253.12.128/28	10.253.12.129 – 10.253.12.142	10.253.12.143
202	10.253.12.144/28	10.253.12.145 – 10.253.12.158	10.253.12.159
203	10.253.12.160/28	10.253.12.161 – 10.253.12.174	10.253.12.175
204	10.253.12.176/28	10.253.12.177 – 10.253.12.190	10.253.12.191
205	10.253.12.192/28	10.253.12.193 – 10.253.12.206	10.253.12.207
206	10.253.12.208/28	10.253.12.209 – 10.253.12.222	10.253.12.223
207	10.253.12.224/28	10.253.12.225 – 10.253.12.238	10.253.12.239
208	10.253.12.240/28	10.253.12.241 – 10.253.12.254	10.253.12.255
209	10.253.13.0/28	10.253.13.1 – 10.253.13.14	10.253.13.15
210	10.253.13.16/28	10.253.13.17 – 10.253.13.30	10.253.13.31
211	10.253.13.32/28	10.253.13.33 – 10.253.13.46	10.253.13.47
212	10.253.13.48/28	10.253.13.49 – 10.253.13.62	10.253.13.63
213	10.253.13.64/28	10.253.13.65 – 10.253.13.78	10.253.13.79
214	10.253.13.80/28	10.253.13.81 – 10.253.13.94	10.253.13.95
215	10.253.13.96/28	10.253.13.97 – 10.253.13.110	10.253.13.111
216	10.253.13.112/28	10.253.13.113 – 10.253.13.126	10.253.13.127
217	10.253.13.128/28	10.253.13.129 – 10.253.13.142	10.253.13.143
218	10.253.13.144/28	10.253.13.145 – 10.253.13.158	10.253.13.159
219	10.253.13.160/28	10.253.13.161 – 10.253.13.174	10.253.13.175
220	10.253.13.176/28	10.253.13.177 – 10.253.13.190	10.253.13.191
221	10.253.13.192/28	10.253.13.193 – 10.253.13.206	10.253.13.207
222	10.253.13.208/28	10.253.13.209 – 10.253.13.222	10.253.13.223
223	10.253.13.224/28	10.253.13.225 – 10.253.13.238	10.253.13.239
224	10.253.13.240/28	10.253.13.241 – 10.253.13.254	10.253.13.255
225	10.253.14.0/28	10.253.14.1 – 10.253.14.14	10.253.14.15
226	10.253.14.16/28	10.253.14.17 – 10.253.14.30	10.253.14.31
227	10.253.14.32/28	10.253.14.33 – 10.253.14.46	10.253.14.47
228	10.253.14.48/28	10.253.14.49 – 10.253.14.62	10.253.14.63
229	10.253.14.64/28	10.253.14.65 – 10.253.14.78	10.253.14.79
230	10.253.14.80/28	10.253.14.81 – 10.253.14.94	10.253.14.95
231	10.253.14.96/28	10.253.14.97 – 10.253.14.110	10.253.14.111
232	10.253.14.112/28	10.253.14.113 – 10.253.14.126	10.253.14.127
233	10.253.14.128/28	10.253.14.129 – 10.253.14.142	10.253.14.143
234	10.253.14.144/28	10.253.14.145 – 10.253.14.158	10.253.14.159
235	10.253.14.160/28	10.253.14.161 – 10.253.14.174	10.253.14.175
236	10.253.14.176/28	10.253.14.177 – 10.253.14.190	10.253.14.191
237	10.253.14.192/28	10.253.14.193 – 10.253.14.206	10.253.14.207
238	10.253.14.208/28	10.253.14.209 – 10.253.14.222	10.253.14.223
239	10.253.14.224/28	10.253.14.225 – 10.253.14.238	10.253.14.239
240	10.253.14.240/28	10.253.14.241 – 10.253.14.254	10.253.14.255
241	10.253.15.0/28	10.253.15.1 – 10.253.15.14	10.253.15.15
242	10.253.15.16/28	10.253.15.17 – 10.253.15.30	10.253.15.31
243	10.253.15.32/28	10.253.15.33 – 10.253.15.46	10.253.15.47
244	10.253.15.48/28	10.253.15.49 – 10.253.15.62	10.253.15.63
245	10.253.15.64/28	10.253.15.65 – 10.253.15.78	10.253.15.79
246	10.253.15.80/28	10.253.15.81 – 10.253.15.94	10.253.15.95
247	10.253.15.96/28	10.253.15.97 – 10.253.15.110	10.253.15.111
248	10.253.15.112/28	10.253.15.113 – 10.253.15.126	10.253.15.127
249	10.253.15.128/28	10.253.15.129 – 10.253.15.142	10.253.15.143
250	10.253.15.144/28	10.253.15.145 – 10.253.15.158	10.253.15.159
251	10.253.15.160/28	10.253.15.161 – 10.253.15.174	10.253.15.175
252	10.253.15.176/28	10.253.15.177 – 10.253.15.190	10.253.15.191
253	10.253.15.192/28	10.253.15.193 – 10.253.15.206	10.253.15.207
254	10.253.15.208/28	10.253.15.209 – 10.253.15.222	10.253.15.223
255	10.253.15.224/28	10.253.15.225 – 10.253.15.238	10.253.15.239
256	10.253.15.240/28	10.253.15.241 – 10.253.15.254	10.253.15.255

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 →