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)10.4.144.0/20

network10.4.144.0/20

broadcast10.4.159.255

first host10.4.144.1

last host10.4.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.4.144.0/20

address00001010.00000100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000100.10010000.00000000

broadcast00001010.00000100.10011111.11111111

green = network part, grey = host part

hex0x0a049000

decimal168071168

reverse dns0.144.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:9000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.4.144.0/28	10.4.144.1 – 10.4.144.14	10.4.144.15
2	10.4.144.16/28	10.4.144.17 – 10.4.144.30	10.4.144.31
3	10.4.144.32/28	10.4.144.33 – 10.4.144.46	10.4.144.47
4	10.4.144.48/28	10.4.144.49 – 10.4.144.62	10.4.144.63
5	10.4.144.64/28	10.4.144.65 – 10.4.144.78	10.4.144.79
6	10.4.144.80/28	10.4.144.81 – 10.4.144.94	10.4.144.95
7	10.4.144.96/28	10.4.144.97 – 10.4.144.110	10.4.144.111
8	10.4.144.112/28	10.4.144.113 – 10.4.144.126	10.4.144.127
9	10.4.144.128/28	10.4.144.129 – 10.4.144.142	10.4.144.143
10	10.4.144.144/28	10.4.144.145 – 10.4.144.158	10.4.144.159
11	10.4.144.160/28	10.4.144.161 – 10.4.144.174	10.4.144.175
12	10.4.144.176/28	10.4.144.177 – 10.4.144.190	10.4.144.191
13	10.4.144.192/28	10.4.144.193 – 10.4.144.206	10.4.144.207
14	10.4.144.208/28	10.4.144.209 – 10.4.144.222	10.4.144.223
15	10.4.144.224/28	10.4.144.225 – 10.4.144.238	10.4.144.239
16	10.4.144.240/28	10.4.144.241 – 10.4.144.254	10.4.144.255
17	10.4.145.0/28	10.4.145.1 – 10.4.145.14	10.4.145.15
18	10.4.145.16/28	10.4.145.17 – 10.4.145.30	10.4.145.31
19	10.4.145.32/28	10.4.145.33 – 10.4.145.46	10.4.145.47
20	10.4.145.48/28	10.4.145.49 – 10.4.145.62	10.4.145.63
21	10.4.145.64/28	10.4.145.65 – 10.4.145.78	10.4.145.79
22	10.4.145.80/28	10.4.145.81 – 10.4.145.94	10.4.145.95
23	10.4.145.96/28	10.4.145.97 – 10.4.145.110	10.4.145.111
24	10.4.145.112/28	10.4.145.113 – 10.4.145.126	10.4.145.127
25	10.4.145.128/28	10.4.145.129 – 10.4.145.142	10.4.145.143
26	10.4.145.144/28	10.4.145.145 – 10.4.145.158	10.4.145.159
27	10.4.145.160/28	10.4.145.161 – 10.4.145.174	10.4.145.175
28	10.4.145.176/28	10.4.145.177 – 10.4.145.190	10.4.145.191
29	10.4.145.192/28	10.4.145.193 – 10.4.145.206	10.4.145.207
30	10.4.145.208/28	10.4.145.209 – 10.4.145.222	10.4.145.223
31	10.4.145.224/28	10.4.145.225 – 10.4.145.238	10.4.145.239
32	10.4.145.240/28	10.4.145.241 – 10.4.145.254	10.4.145.255
33	10.4.146.0/28	10.4.146.1 – 10.4.146.14	10.4.146.15
34	10.4.146.16/28	10.4.146.17 – 10.4.146.30	10.4.146.31
35	10.4.146.32/28	10.4.146.33 – 10.4.146.46	10.4.146.47
36	10.4.146.48/28	10.4.146.49 – 10.4.146.62	10.4.146.63
37	10.4.146.64/28	10.4.146.65 – 10.4.146.78	10.4.146.79
38	10.4.146.80/28	10.4.146.81 – 10.4.146.94	10.4.146.95
39	10.4.146.96/28	10.4.146.97 – 10.4.146.110	10.4.146.111
40	10.4.146.112/28	10.4.146.113 – 10.4.146.126	10.4.146.127
41	10.4.146.128/28	10.4.146.129 – 10.4.146.142	10.4.146.143
42	10.4.146.144/28	10.4.146.145 – 10.4.146.158	10.4.146.159
43	10.4.146.160/28	10.4.146.161 – 10.4.146.174	10.4.146.175
44	10.4.146.176/28	10.4.146.177 – 10.4.146.190	10.4.146.191
45	10.4.146.192/28	10.4.146.193 – 10.4.146.206	10.4.146.207
46	10.4.146.208/28	10.4.146.209 – 10.4.146.222	10.4.146.223
47	10.4.146.224/28	10.4.146.225 – 10.4.146.238	10.4.146.239
48	10.4.146.240/28	10.4.146.241 – 10.4.146.254	10.4.146.255
49	10.4.147.0/28	10.4.147.1 – 10.4.147.14	10.4.147.15
50	10.4.147.16/28	10.4.147.17 – 10.4.147.30	10.4.147.31
51	10.4.147.32/28	10.4.147.33 – 10.4.147.46	10.4.147.47
52	10.4.147.48/28	10.4.147.49 – 10.4.147.62	10.4.147.63
53	10.4.147.64/28	10.4.147.65 – 10.4.147.78	10.4.147.79
54	10.4.147.80/28	10.4.147.81 – 10.4.147.94	10.4.147.95
55	10.4.147.96/28	10.4.147.97 – 10.4.147.110	10.4.147.111
56	10.4.147.112/28	10.4.147.113 – 10.4.147.126	10.4.147.127
57	10.4.147.128/28	10.4.147.129 – 10.4.147.142	10.4.147.143
58	10.4.147.144/28	10.4.147.145 – 10.4.147.158	10.4.147.159
59	10.4.147.160/28	10.4.147.161 – 10.4.147.174	10.4.147.175
60	10.4.147.176/28	10.4.147.177 – 10.4.147.190	10.4.147.191
61	10.4.147.192/28	10.4.147.193 – 10.4.147.206	10.4.147.207
62	10.4.147.208/28	10.4.147.209 – 10.4.147.222	10.4.147.223
63	10.4.147.224/28	10.4.147.225 – 10.4.147.238	10.4.147.239
64	10.4.147.240/28	10.4.147.241 – 10.4.147.254	10.4.147.255
65	10.4.148.0/28	10.4.148.1 – 10.4.148.14	10.4.148.15
66	10.4.148.16/28	10.4.148.17 – 10.4.148.30	10.4.148.31
67	10.4.148.32/28	10.4.148.33 – 10.4.148.46	10.4.148.47
68	10.4.148.48/28	10.4.148.49 – 10.4.148.62	10.4.148.63
69	10.4.148.64/28	10.4.148.65 – 10.4.148.78	10.4.148.79
70	10.4.148.80/28	10.4.148.81 – 10.4.148.94	10.4.148.95
71	10.4.148.96/28	10.4.148.97 – 10.4.148.110	10.4.148.111
72	10.4.148.112/28	10.4.148.113 – 10.4.148.126	10.4.148.127
73	10.4.148.128/28	10.4.148.129 – 10.4.148.142	10.4.148.143
74	10.4.148.144/28	10.4.148.145 – 10.4.148.158	10.4.148.159
75	10.4.148.160/28	10.4.148.161 – 10.4.148.174	10.4.148.175
76	10.4.148.176/28	10.4.148.177 – 10.4.148.190	10.4.148.191
77	10.4.148.192/28	10.4.148.193 – 10.4.148.206	10.4.148.207
78	10.4.148.208/28	10.4.148.209 – 10.4.148.222	10.4.148.223
79	10.4.148.224/28	10.4.148.225 – 10.4.148.238	10.4.148.239
80	10.4.148.240/28	10.4.148.241 – 10.4.148.254	10.4.148.255
81	10.4.149.0/28	10.4.149.1 – 10.4.149.14	10.4.149.15
82	10.4.149.16/28	10.4.149.17 – 10.4.149.30	10.4.149.31
83	10.4.149.32/28	10.4.149.33 – 10.4.149.46	10.4.149.47
84	10.4.149.48/28	10.4.149.49 – 10.4.149.62	10.4.149.63
85	10.4.149.64/28	10.4.149.65 – 10.4.149.78	10.4.149.79
86	10.4.149.80/28	10.4.149.81 – 10.4.149.94	10.4.149.95
87	10.4.149.96/28	10.4.149.97 – 10.4.149.110	10.4.149.111
88	10.4.149.112/28	10.4.149.113 – 10.4.149.126	10.4.149.127
89	10.4.149.128/28	10.4.149.129 – 10.4.149.142	10.4.149.143
90	10.4.149.144/28	10.4.149.145 – 10.4.149.158	10.4.149.159
91	10.4.149.160/28	10.4.149.161 – 10.4.149.174	10.4.149.175
92	10.4.149.176/28	10.4.149.177 – 10.4.149.190	10.4.149.191
93	10.4.149.192/28	10.4.149.193 – 10.4.149.206	10.4.149.207
94	10.4.149.208/28	10.4.149.209 – 10.4.149.222	10.4.149.223
95	10.4.149.224/28	10.4.149.225 – 10.4.149.238	10.4.149.239
96	10.4.149.240/28	10.4.149.241 – 10.4.149.254	10.4.149.255
97	10.4.150.0/28	10.4.150.1 – 10.4.150.14	10.4.150.15
98	10.4.150.16/28	10.4.150.17 – 10.4.150.30	10.4.150.31
99	10.4.150.32/28	10.4.150.33 – 10.4.150.46	10.4.150.47
100	10.4.150.48/28	10.4.150.49 – 10.4.150.62	10.4.150.63
101	10.4.150.64/28	10.4.150.65 – 10.4.150.78	10.4.150.79
102	10.4.150.80/28	10.4.150.81 – 10.4.150.94	10.4.150.95
103	10.4.150.96/28	10.4.150.97 – 10.4.150.110	10.4.150.111
104	10.4.150.112/28	10.4.150.113 – 10.4.150.126	10.4.150.127
105	10.4.150.128/28	10.4.150.129 – 10.4.150.142	10.4.150.143
106	10.4.150.144/28	10.4.150.145 – 10.4.150.158	10.4.150.159
107	10.4.150.160/28	10.4.150.161 – 10.4.150.174	10.4.150.175
108	10.4.150.176/28	10.4.150.177 – 10.4.150.190	10.4.150.191
109	10.4.150.192/28	10.4.150.193 – 10.4.150.206	10.4.150.207
110	10.4.150.208/28	10.4.150.209 – 10.4.150.222	10.4.150.223
111	10.4.150.224/28	10.4.150.225 – 10.4.150.238	10.4.150.239
112	10.4.150.240/28	10.4.150.241 – 10.4.150.254	10.4.150.255
113	10.4.151.0/28	10.4.151.1 – 10.4.151.14	10.4.151.15
114	10.4.151.16/28	10.4.151.17 – 10.4.151.30	10.4.151.31
115	10.4.151.32/28	10.4.151.33 – 10.4.151.46	10.4.151.47
116	10.4.151.48/28	10.4.151.49 – 10.4.151.62	10.4.151.63
117	10.4.151.64/28	10.4.151.65 – 10.4.151.78	10.4.151.79
118	10.4.151.80/28	10.4.151.81 – 10.4.151.94	10.4.151.95
119	10.4.151.96/28	10.4.151.97 – 10.4.151.110	10.4.151.111
120	10.4.151.112/28	10.4.151.113 – 10.4.151.126	10.4.151.127
121	10.4.151.128/28	10.4.151.129 – 10.4.151.142	10.4.151.143
122	10.4.151.144/28	10.4.151.145 – 10.4.151.158	10.4.151.159
123	10.4.151.160/28	10.4.151.161 – 10.4.151.174	10.4.151.175
124	10.4.151.176/28	10.4.151.177 – 10.4.151.190	10.4.151.191
125	10.4.151.192/28	10.4.151.193 – 10.4.151.206	10.4.151.207
126	10.4.151.208/28	10.4.151.209 – 10.4.151.222	10.4.151.223
127	10.4.151.224/28	10.4.151.225 – 10.4.151.238	10.4.151.239
128	10.4.151.240/28	10.4.151.241 – 10.4.151.254	10.4.151.255
129	10.4.152.0/28	10.4.152.1 – 10.4.152.14	10.4.152.15
130	10.4.152.16/28	10.4.152.17 – 10.4.152.30	10.4.152.31
131	10.4.152.32/28	10.4.152.33 – 10.4.152.46	10.4.152.47
132	10.4.152.48/28	10.4.152.49 – 10.4.152.62	10.4.152.63
133	10.4.152.64/28	10.4.152.65 – 10.4.152.78	10.4.152.79
134	10.4.152.80/28	10.4.152.81 – 10.4.152.94	10.4.152.95
135	10.4.152.96/28	10.4.152.97 – 10.4.152.110	10.4.152.111
136	10.4.152.112/28	10.4.152.113 – 10.4.152.126	10.4.152.127
137	10.4.152.128/28	10.4.152.129 – 10.4.152.142	10.4.152.143
138	10.4.152.144/28	10.4.152.145 – 10.4.152.158	10.4.152.159
139	10.4.152.160/28	10.4.152.161 – 10.4.152.174	10.4.152.175
140	10.4.152.176/28	10.4.152.177 – 10.4.152.190	10.4.152.191
141	10.4.152.192/28	10.4.152.193 – 10.4.152.206	10.4.152.207
142	10.4.152.208/28	10.4.152.209 – 10.4.152.222	10.4.152.223
143	10.4.152.224/28	10.4.152.225 – 10.4.152.238	10.4.152.239
144	10.4.152.240/28	10.4.152.241 – 10.4.152.254	10.4.152.255
145	10.4.153.0/28	10.4.153.1 – 10.4.153.14	10.4.153.15
146	10.4.153.16/28	10.4.153.17 – 10.4.153.30	10.4.153.31
147	10.4.153.32/28	10.4.153.33 – 10.4.153.46	10.4.153.47
148	10.4.153.48/28	10.4.153.49 – 10.4.153.62	10.4.153.63
149	10.4.153.64/28	10.4.153.65 – 10.4.153.78	10.4.153.79
150	10.4.153.80/28	10.4.153.81 – 10.4.153.94	10.4.153.95
151	10.4.153.96/28	10.4.153.97 – 10.4.153.110	10.4.153.111
152	10.4.153.112/28	10.4.153.113 – 10.4.153.126	10.4.153.127
153	10.4.153.128/28	10.4.153.129 – 10.4.153.142	10.4.153.143
154	10.4.153.144/28	10.4.153.145 – 10.4.153.158	10.4.153.159
155	10.4.153.160/28	10.4.153.161 – 10.4.153.174	10.4.153.175
156	10.4.153.176/28	10.4.153.177 – 10.4.153.190	10.4.153.191
157	10.4.153.192/28	10.4.153.193 – 10.4.153.206	10.4.153.207
158	10.4.153.208/28	10.4.153.209 – 10.4.153.222	10.4.153.223
159	10.4.153.224/28	10.4.153.225 – 10.4.153.238	10.4.153.239
160	10.4.153.240/28	10.4.153.241 – 10.4.153.254	10.4.153.255
161	10.4.154.0/28	10.4.154.1 – 10.4.154.14	10.4.154.15
162	10.4.154.16/28	10.4.154.17 – 10.4.154.30	10.4.154.31
163	10.4.154.32/28	10.4.154.33 – 10.4.154.46	10.4.154.47
164	10.4.154.48/28	10.4.154.49 – 10.4.154.62	10.4.154.63
165	10.4.154.64/28	10.4.154.65 – 10.4.154.78	10.4.154.79
166	10.4.154.80/28	10.4.154.81 – 10.4.154.94	10.4.154.95
167	10.4.154.96/28	10.4.154.97 – 10.4.154.110	10.4.154.111
168	10.4.154.112/28	10.4.154.113 – 10.4.154.126	10.4.154.127
169	10.4.154.128/28	10.4.154.129 – 10.4.154.142	10.4.154.143
170	10.4.154.144/28	10.4.154.145 – 10.4.154.158	10.4.154.159
171	10.4.154.160/28	10.4.154.161 – 10.4.154.174	10.4.154.175
172	10.4.154.176/28	10.4.154.177 – 10.4.154.190	10.4.154.191
173	10.4.154.192/28	10.4.154.193 – 10.4.154.206	10.4.154.207
174	10.4.154.208/28	10.4.154.209 – 10.4.154.222	10.4.154.223
175	10.4.154.224/28	10.4.154.225 – 10.4.154.238	10.4.154.239
176	10.4.154.240/28	10.4.154.241 – 10.4.154.254	10.4.154.255
177	10.4.155.0/28	10.4.155.1 – 10.4.155.14	10.4.155.15
178	10.4.155.16/28	10.4.155.17 – 10.4.155.30	10.4.155.31
179	10.4.155.32/28	10.4.155.33 – 10.4.155.46	10.4.155.47
180	10.4.155.48/28	10.4.155.49 – 10.4.155.62	10.4.155.63
181	10.4.155.64/28	10.4.155.65 – 10.4.155.78	10.4.155.79
182	10.4.155.80/28	10.4.155.81 – 10.4.155.94	10.4.155.95
183	10.4.155.96/28	10.4.155.97 – 10.4.155.110	10.4.155.111
184	10.4.155.112/28	10.4.155.113 – 10.4.155.126	10.4.155.127
185	10.4.155.128/28	10.4.155.129 – 10.4.155.142	10.4.155.143
186	10.4.155.144/28	10.4.155.145 – 10.4.155.158	10.4.155.159
187	10.4.155.160/28	10.4.155.161 – 10.4.155.174	10.4.155.175
188	10.4.155.176/28	10.4.155.177 – 10.4.155.190	10.4.155.191
189	10.4.155.192/28	10.4.155.193 – 10.4.155.206	10.4.155.207
190	10.4.155.208/28	10.4.155.209 – 10.4.155.222	10.4.155.223
191	10.4.155.224/28	10.4.155.225 – 10.4.155.238	10.4.155.239
192	10.4.155.240/28	10.4.155.241 – 10.4.155.254	10.4.155.255
193	10.4.156.0/28	10.4.156.1 – 10.4.156.14	10.4.156.15
194	10.4.156.16/28	10.4.156.17 – 10.4.156.30	10.4.156.31
195	10.4.156.32/28	10.4.156.33 – 10.4.156.46	10.4.156.47
196	10.4.156.48/28	10.4.156.49 – 10.4.156.62	10.4.156.63
197	10.4.156.64/28	10.4.156.65 – 10.4.156.78	10.4.156.79
198	10.4.156.80/28	10.4.156.81 – 10.4.156.94	10.4.156.95
199	10.4.156.96/28	10.4.156.97 – 10.4.156.110	10.4.156.111
200	10.4.156.112/28	10.4.156.113 – 10.4.156.126	10.4.156.127
201	10.4.156.128/28	10.4.156.129 – 10.4.156.142	10.4.156.143
202	10.4.156.144/28	10.4.156.145 – 10.4.156.158	10.4.156.159
203	10.4.156.160/28	10.4.156.161 – 10.4.156.174	10.4.156.175
204	10.4.156.176/28	10.4.156.177 – 10.4.156.190	10.4.156.191
205	10.4.156.192/28	10.4.156.193 – 10.4.156.206	10.4.156.207
206	10.4.156.208/28	10.4.156.209 – 10.4.156.222	10.4.156.223
207	10.4.156.224/28	10.4.156.225 – 10.4.156.238	10.4.156.239
208	10.4.156.240/28	10.4.156.241 – 10.4.156.254	10.4.156.255
209	10.4.157.0/28	10.4.157.1 – 10.4.157.14	10.4.157.15
210	10.4.157.16/28	10.4.157.17 – 10.4.157.30	10.4.157.31
211	10.4.157.32/28	10.4.157.33 – 10.4.157.46	10.4.157.47
212	10.4.157.48/28	10.4.157.49 – 10.4.157.62	10.4.157.63
213	10.4.157.64/28	10.4.157.65 – 10.4.157.78	10.4.157.79
214	10.4.157.80/28	10.4.157.81 – 10.4.157.94	10.4.157.95
215	10.4.157.96/28	10.4.157.97 – 10.4.157.110	10.4.157.111
216	10.4.157.112/28	10.4.157.113 – 10.4.157.126	10.4.157.127
217	10.4.157.128/28	10.4.157.129 – 10.4.157.142	10.4.157.143
218	10.4.157.144/28	10.4.157.145 – 10.4.157.158	10.4.157.159
219	10.4.157.160/28	10.4.157.161 – 10.4.157.174	10.4.157.175
220	10.4.157.176/28	10.4.157.177 – 10.4.157.190	10.4.157.191
221	10.4.157.192/28	10.4.157.193 – 10.4.157.206	10.4.157.207
222	10.4.157.208/28	10.4.157.209 – 10.4.157.222	10.4.157.223
223	10.4.157.224/28	10.4.157.225 – 10.4.157.238	10.4.157.239
224	10.4.157.240/28	10.4.157.241 – 10.4.157.254	10.4.157.255
225	10.4.158.0/28	10.4.158.1 – 10.4.158.14	10.4.158.15
226	10.4.158.16/28	10.4.158.17 – 10.4.158.30	10.4.158.31
227	10.4.158.32/28	10.4.158.33 – 10.4.158.46	10.4.158.47
228	10.4.158.48/28	10.4.158.49 – 10.4.158.62	10.4.158.63
229	10.4.158.64/28	10.4.158.65 – 10.4.158.78	10.4.158.79
230	10.4.158.80/28	10.4.158.81 – 10.4.158.94	10.4.158.95
231	10.4.158.96/28	10.4.158.97 – 10.4.158.110	10.4.158.111
232	10.4.158.112/28	10.4.158.113 – 10.4.158.126	10.4.158.127
233	10.4.158.128/28	10.4.158.129 – 10.4.158.142	10.4.158.143
234	10.4.158.144/28	10.4.158.145 – 10.4.158.158	10.4.158.159
235	10.4.158.160/28	10.4.158.161 – 10.4.158.174	10.4.158.175
236	10.4.158.176/28	10.4.158.177 – 10.4.158.190	10.4.158.191
237	10.4.158.192/28	10.4.158.193 – 10.4.158.206	10.4.158.207
238	10.4.158.208/28	10.4.158.209 – 10.4.158.222	10.4.158.223
239	10.4.158.224/28	10.4.158.225 – 10.4.158.238	10.4.158.239
240	10.4.158.240/28	10.4.158.241 – 10.4.158.254	10.4.158.255
241	10.4.159.0/28	10.4.159.1 – 10.4.159.14	10.4.159.15
242	10.4.159.16/28	10.4.159.17 – 10.4.159.30	10.4.159.31
243	10.4.159.32/28	10.4.159.33 – 10.4.159.46	10.4.159.47
244	10.4.159.48/28	10.4.159.49 – 10.4.159.62	10.4.159.63
245	10.4.159.64/28	10.4.159.65 – 10.4.159.78	10.4.159.79
246	10.4.159.80/28	10.4.159.81 – 10.4.159.94	10.4.159.95
247	10.4.159.96/28	10.4.159.97 – 10.4.159.110	10.4.159.111
248	10.4.159.112/28	10.4.159.113 – 10.4.159.126	10.4.159.127
249	10.4.159.128/28	10.4.159.129 – 10.4.159.142	10.4.159.143
250	10.4.159.144/28	10.4.159.145 – 10.4.159.158	10.4.159.159
251	10.4.159.160/28	10.4.159.161 – 10.4.159.174	10.4.159.175
252	10.4.159.176/28	10.4.159.177 – 10.4.159.190	10.4.159.191
253	10.4.159.192/28	10.4.159.193 – 10.4.159.206	10.4.159.207
254	10.4.159.208/28	10.4.159.209 – 10.4.159.222	10.4.159.223
255	10.4.159.224/28	10.4.159.225 – 10.4.159.238	10.4.159.239
256	10.4.159.240/28	10.4.159.241 – 10.4.159.254	10.4.159.255

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 →