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)10.2.16.0/20

network10.2.16.0/20

broadcast10.2.31.255

first host10.2.16.1

last host10.2.31.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.16.0/20

address00001010.00000010.00010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.00010000.00000000

broadcast00001010.00000010.00011111.11111111

green = network part, grey = host part

hex0x0a021000

decimal167907328

reverse dns0.16.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:1000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.16.0/28	10.2.16.1 – 10.2.16.14	10.2.16.15
2	10.2.16.16/28	10.2.16.17 – 10.2.16.30	10.2.16.31
3	10.2.16.32/28	10.2.16.33 – 10.2.16.46	10.2.16.47
4	10.2.16.48/28	10.2.16.49 – 10.2.16.62	10.2.16.63
5	10.2.16.64/28	10.2.16.65 – 10.2.16.78	10.2.16.79
6	10.2.16.80/28	10.2.16.81 – 10.2.16.94	10.2.16.95
7	10.2.16.96/28	10.2.16.97 – 10.2.16.110	10.2.16.111
8	10.2.16.112/28	10.2.16.113 – 10.2.16.126	10.2.16.127
9	10.2.16.128/28	10.2.16.129 – 10.2.16.142	10.2.16.143
10	10.2.16.144/28	10.2.16.145 – 10.2.16.158	10.2.16.159
11	10.2.16.160/28	10.2.16.161 – 10.2.16.174	10.2.16.175
12	10.2.16.176/28	10.2.16.177 – 10.2.16.190	10.2.16.191
13	10.2.16.192/28	10.2.16.193 – 10.2.16.206	10.2.16.207
14	10.2.16.208/28	10.2.16.209 – 10.2.16.222	10.2.16.223
15	10.2.16.224/28	10.2.16.225 – 10.2.16.238	10.2.16.239
16	10.2.16.240/28	10.2.16.241 – 10.2.16.254	10.2.16.255
17	10.2.17.0/28	10.2.17.1 – 10.2.17.14	10.2.17.15
18	10.2.17.16/28	10.2.17.17 – 10.2.17.30	10.2.17.31
19	10.2.17.32/28	10.2.17.33 – 10.2.17.46	10.2.17.47
20	10.2.17.48/28	10.2.17.49 – 10.2.17.62	10.2.17.63
21	10.2.17.64/28	10.2.17.65 – 10.2.17.78	10.2.17.79
22	10.2.17.80/28	10.2.17.81 – 10.2.17.94	10.2.17.95
23	10.2.17.96/28	10.2.17.97 – 10.2.17.110	10.2.17.111
24	10.2.17.112/28	10.2.17.113 – 10.2.17.126	10.2.17.127
25	10.2.17.128/28	10.2.17.129 – 10.2.17.142	10.2.17.143
26	10.2.17.144/28	10.2.17.145 – 10.2.17.158	10.2.17.159
27	10.2.17.160/28	10.2.17.161 – 10.2.17.174	10.2.17.175
28	10.2.17.176/28	10.2.17.177 – 10.2.17.190	10.2.17.191
29	10.2.17.192/28	10.2.17.193 – 10.2.17.206	10.2.17.207
30	10.2.17.208/28	10.2.17.209 – 10.2.17.222	10.2.17.223
31	10.2.17.224/28	10.2.17.225 – 10.2.17.238	10.2.17.239
32	10.2.17.240/28	10.2.17.241 – 10.2.17.254	10.2.17.255
33	10.2.18.0/28	10.2.18.1 – 10.2.18.14	10.2.18.15
34	10.2.18.16/28	10.2.18.17 – 10.2.18.30	10.2.18.31
35	10.2.18.32/28	10.2.18.33 – 10.2.18.46	10.2.18.47
36	10.2.18.48/28	10.2.18.49 – 10.2.18.62	10.2.18.63
37	10.2.18.64/28	10.2.18.65 – 10.2.18.78	10.2.18.79
38	10.2.18.80/28	10.2.18.81 – 10.2.18.94	10.2.18.95
39	10.2.18.96/28	10.2.18.97 – 10.2.18.110	10.2.18.111
40	10.2.18.112/28	10.2.18.113 – 10.2.18.126	10.2.18.127
41	10.2.18.128/28	10.2.18.129 – 10.2.18.142	10.2.18.143
42	10.2.18.144/28	10.2.18.145 – 10.2.18.158	10.2.18.159
43	10.2.18.160/28	10.2.18.161 – 10.2.18.174	10.2.18.175
44	10.2.18.176/28	10.2.18.177 – 10.2.18.190	10.2.18.191
45	10.2.18.192/28	10.2.18.193 – 10.2.18.206	10.2.18.207
46	10.2.18.208/28	10.2.18.209 – 10.2.18.222	10.2.18.223
47	10.2.18.224/28	10.2.18.225 – 10.2.18.238	10.2.18.239
48	10.2.18.240/28	10.2.18.241 – 10.2.18.254	10.2.18.255
49	10.2.19.0/28	10.2.19.1 – 10.2.19.14	10.2.19.15
50	10.2.19.16/28	10.2.19.17 – 10.2.19.30	10.2.19.31
51	10.2.19.32/28	10.2.19.33 – 10.2.19.46	10.2.19.47
52	10.2.19.48/28	10.2.19.49 – 10.2.19.62	10.2.19.63
53	10.2.19.64/28	10.2.19.65 – 10.2.19.78	10.2.19.79
54	10.2.19.80/28	10.2.19.81 – 10.2.19.94	10.2.19.95
55	10.2.19.96/28	10.2.19.97 – 10.2.19.110	10.2.19.111
56	10.2.19.112/28	10.2.19.113 – 10.2.19.126	10.2.19.127
57	10.2.19.128/28	10.2.19.129 – 10.2.19.142	10.2.19.143
58	10.2.19.144/28	10.2.19.145 – 10.2.19.158	10.2.19.159
59	10.2.19.160/28	10.2.19.161 – 10.2.19.174	10.2.19.175
60	10.2.19.176/28	10.2.19.177 – 10.2.19.190	10.2.19.191
61	10.2.19.192/28	10.2.19.193 – 10.2.19.206	10.2.19.207
62	10.2.19.208/28	10.2.19.209 – 10.2.19.222	10.2.19.223
63	10.2.19.224/28	10.2.19.225 – 10.2.19.238	10.2.19.239
64	10.2.19.240/28	10.2.19.241 – 10.2.19.254	10.2.19.255
65	10.2.20.0/28	10.2.20.1 – 10.2.20.14	10.2.20.15
66	10.2.20.16/28	10.2.20.17 – 10.2.20.30	10.2.20.31
67	10.2.20.32/28	10.2.20.33 – 10.2.20.46	10.2.20.47
68	10.2.20.48/28	10.2.20.49 – 10.2.20.62	10.2.20.63
69	10.2.20.64/28	10.2.20.65 – 10.2.20.78	10.2.20.79
70	10.2.20.80/28	10.2.20.81 – 10.2.20.94	10.2.20.95
71	10.2.20.96/28	10.2.20.97 – 10.2.20.110	10.2.20.111
72	10.2.20.112/28	10.2.20.113 – 10.2.20.126	10.2.20.127
73	10.2.20.128/28	10.2.20.129 – 10.2.20.142	10.2.20.143
74	10.2.20.144/28	10.2.20.145 – 10.2.20.158	10.2.20.159
75	10.2.20.160/28	10.2.20.161 – 10.2.20.174	10.2.20.175
76	10.2.20.176/28	10.2.20.177 – 10.2.20.190	10.2.20.191
77	10.2.20.192/28	10.2.20.193 – 10.2.20.206	10.2.20.207
78	10.2.20.208/28	10.2.20.209 – 10.2.20.222	10.2.20.223
79	10.2.20.224/28	10.2.20.225 – 10.2.20.238	10.2.20.239
80	10.2.20.240/28	10.2.20.241 – 10.2.20.254	10.2.20.255
81	10.2.21.0/28	10.2.21.1 – 10.2.21.14	10.2.21.15
82	10.2.21.16/28	10.2.21.17 – 10.2.21.30	10.2.21.31
83	10.2.21.32/28	10.2.21.33 – 10.2.21.46	10.2.21.47
84	10.2.21.48/28	10.2.21.49 – 10.2.21.62	10.2.21.63
85	10.2.21.64/28	10.2.21.65 – 10.2.21.78	10.2.21.79
86	10.2.21.80/28	10.2.21.81 – 10.2.21.94	10.2.21.95
87	10.2.21.96/28	10.2.21.97 – 10.2.21.110	10.2.21.111
88	10.2.21.112/28	10.2.21.113 – 10.2.21.126	10.2.21.127
89	10.2.21.128/28	10.2.21.129 – 10.2.21.142	10.2.21.143
90	10.2.21.144/28	10.2.21.145 – 10.2.21.158	10.2.21.159
91	10.2.21.160/28	10.2.21.161 – 10.2.21.174	10.2.21.175
92	10.2.21.176/28	10.2.21.177 – 10.2.21.190	10.2.21.191
93	10.2.21.192/28	10.2.21.193 – 10.2.21.206	10.2.21.207
94	10.2.21.208/28	10.2.21.209 – 10.2.21.222	10.2.21.223
95	10.2.21.224/28	10.2.21.225 – 10.2.21.238	10.2.21.239
96	10.2.21.240/28	10.2.21.241 – 10.2.21.254	10.2.21.255
97	10.2.22.0/28	10.2.22.1 – 10.2.22.14	10.2.22.15
98	10.2.22.16/28	10.2.22.17 – 10.2.22.30	10.2.22.31
99	10.2.22.32/28	10.2.22.33 – 10.2.22.46	10.2.22.47
100	10.2.22.48/28	10.2.22.49 – 10.2.22.62	10.2.22.63
101	10.2.22.64/28	10.2.22.65 – 10.2.22.78	10.2.22.79
102	10.2.22.80/28	10.2.22.81 – 10.2.22.94	10.2.22.95
103	10.2.22.96/28	10.2.22.97 – 10.2.22.110	10.2.22.111
104	10.2.22.112/28	10.2.22.113 – 10.2.22.126	10.2.22.127
105	10.2.22.128/28	10.2.22.129 – 10.2.22.142	10.2.22.143
106	10.2.22.144/28	10.2.22.145 – 10.2.22.158	10.2.22.159
107	10.2.22.160/28	10.2.22.161 – 10.2.22.174	10.2.22.175
108	10.2.22.176/28	10.2.22.177 – 10.2.22.190	10.2.22.191
109	10.2.22.192/28	10.2.22.193 – 10.2.22.206	10.2.22.207
110	10.2.22.208/28	10.2.22.209 – 10.2.22.222	10.2.22.223
111	10.2.22.224/28	10.2.22.225 – 10.2.22.238	10.2.22.239
112	10.2.22.240/28	10.2.22.241 – 10.2.22.254	10.2.22.255
113	10.2.23.0/28	10.2.23.1 – 10.2.23.14	10.2.23.15
114	10.2.23.16/28	10.2.23.17 – 10.2.23.30	10.2.23.31
115	10.2.23.32/28	10.2.23.33 – 10.2.23.46	10.2.23.47
116	10.2.23.48/28	10.2.23.49 – 10.2.23.62	10.2.23.63
117	10.2.23.64/28	10.2.23.65 – 10.2.23.78	10.2.23.79
118	10.2.23.80/28	10.2.23.81 – 10.2.23.94	10.2.23.95
119	10.2.23.96/28	10.2.23.97 – 10.2.23.110	10.2.23.111
120	10.2.23.112/28	10.2.23.113 – 10.2.23.126	10.2.23.127
121	10.2.23.128/28	10.2.23.129 – 10.2.23.142	10.2.23.143
122	10.2.23.144/28	10.2.23.145 – 10.2.23.158	10.2.23.159
123	10.2.23.160/28	10.2.23.161 – 10.2.23.174	10.2.23.175
124	10.2.23.176/28	10.2.23.177 – 10.2.23.190	10.2.23.191
125	10.2.23.192/28	10.2.23.193 – 10.2.23.206	10.2.23.207
126	10.2.23.208/28	10.2.23.209 – 10.2.23.222	10.2.23.223
127	10.2.23.224/28	10.2.23.225 – 10.2.23.238	10.2.23.239
128	10.2.23.240/28	10.2.23.241 – 10.2.23.254	10.2.23.255
129	10.2.24.0/28	10.2.24.1 – 10.2.24.14	10.2.24.15
130	10.2.24.16/28	10.2.24.17 – 10.2.24.30	10.2.24.31
131	10.2.24.32/28	10.2.24.33 – 10.2.24.46	10.2.24.47
132	10.2.24.48/28	10.2.24.49 – 10.2.24.62	10.2.24.63
133	10.2.24.64/28	10.2.24.65 – 10.2.24.78	10.2.24.79
134	10.2.24.80/28	10.2.24.81 – 10.2.24.94	10.2.24.95
135	10.2.24.96/28	10.2.24.97 – 10.2.24.110	10.2.24.111
136	10.2.24.112/28	10.2.24.113 – 10.2.24.126	10.2.24.127
137	10.2.24.128/28	10.2.24.129 – 10.2.24.142	10.2.24.143
138	10.2.24.144/28	10.2.24.145 – 10.2.24.158	10.2.24.159
139	10.2.24.160/28	10.2.24.161 – 10.2.24.174	10.2.24.175
140	10.2.24.176/28	10.2.24.177 – 10.2.24.190	10.2.24.191
141	10.2.24.192/28	10.2.24.193 – 10.2.24.206	10.2.24.207
142	10.2.24.208/28	10.2.24.209 – 10.2.24.222	10.2.24.223
143	10.2.24.224/28	10.2.24.225 – 10.2.24.238	10.2.24.239
144	10.2.24.240/28	10.2.24.241 – 10.2.24.254	10.2.24.255
145	10.2.25.0/28	10.2.25.1 – 10.2.25.14	10.2.25.15
146	10.2.25.16/28	10.2.25.17 – 10.2.25.30	10.2.25.31
147	10.2.25.32/28	10.2.25.33 – 10.2.25.46	10.2.25.47
148	10.2.25.48/28	10.2.25.49 – 10.2.25.62	10.2.25.63
149	10.2.25.64/28	10.2.25.65 – 10.2.25.78	10.2.25.79
150	10.2.25.80/28	10.2.25.81 – 10.2.25.94	10.2.25.95
151	10.2.25.96/28	10.2.25.97 – 10.2.25.110	10.2.25.111
152	10.2.25.112/28	10.2.25.113 – 10.2.25.126	10.2.25.127
153	10.2.25.128/28	10.2.25.129 – 10.2.25.142	10.2.25.143
154	10.2.25.144/28	10.2.25.145 – 10.2.25.158	10.2.25.159
155	10.2.25.160/28	10.2.25.161 – 10.2.25.174	10.2.25.175
156	10.2.25.176/28	10.2.25.177 – 10.2.25.190	10.2.25.191
157	10.2.25.192/28	10.2.25.193 – 10.2.25.206	10.2.25.207
158	10.2.25.208/28	10.2.25.209 – 10.2.25.222	10.2.25.223
159	10.2.25.224/28	10.2.25.225 – 10.2.25.238	10.2.25.239
160	10.2.25.240/28	10.2.25.241 – 10.2.25.254	10.2.25.255
161	10.2.26.0/28	10.2.26.1 – 10.2.26.14	10.2.26.15
162	10.2.26.16/28	10.2.26.17 – 10.2.26.30	10.2.26.31
163	10.2.26.32/28	10.2.26.33 – 10.2.26.46	10.2.26.47
164	10.2.26.48/28	10.2.26.49 – 10.2.26.62	10.2.26.63
165	10.2.26.64/28	10.2.26.65 – 10.2.26.78	10.2.26.79
166	10.2.26.80/28	10.2.26.81 – 10.2.26.94	10.2.26.95
167	10.2.26.96/28	10.2.26.97 – 10.2.26.110	10.2.26.111
168	10.2.26.112/28	10.2.26.113 – 10.2.26.126	10.2.26.127
169	10.2.26.128/28	10.2.26.129 – 10.2.26.142	10.2.26.143
170	10.2.26.144/28	10.2.26.145 – 10.2.26.158	10.2.26.159
171	10.2.26.160/28	10.2.26.161 – 10.2.26.174	10.2.26.175
172	10.2.26.176/28	10.2.26.177 – 10.2.26.190	10.2.26.191
173	10.2.26.192/28	10.2.26.193 – 10.2.26.206	10.2.26.207
174	10.2.26.208/28	10.2.26.209 – 10.2.26.222	10.2.26.223
175	10.2.26.224/28	10.2.26.225 – 10.2.26.238	10.2.26.239
176	10.2.26.240/28	10.2.26.241 – 10.2.26.254	10.2.26.255
177	10.2.27.0/28	10.2.27.1 – 10.2.27.14	10.2.27.15
178	10.2.27.16/28	10.2.27.17 – 10.2.27.30	10.2.27.31
179	10.2.27.32/28	10.2.27.33 – 10.2.27.46	10.2.27.47
180	10.2.27.48/28	10.2.27.49 – 10.2.27.62	10.2.27.63
181	10.2.27.64/28	10.2.27.65 – 10.2.27.78	10.2.27.79
182	10.2.27.80/28	10.2.27.81 – 10.2.27.94	10.2.27.95
183	10.2.27.96/28	10.2.27.97 – 10.2.27.110	10.2.27.111
184	10.2.27.112/28	10.2.27.113 – 10.2.27.126	10.2.27.127
185	10.2.27.128/28	10.2.27.129 – 10.2.27.142	10.2.27.143
186	10.2.27.144/28	10.2.27.145 – 10.2.27.158	10.2.27.159
187	10.2.27.160/28	10.2.27.161 – 10.2.27.174	10.2.27.175
188	10.2.27.176/28	10.2.27.177 – 10.2.27.190	10.2.27.191
189	10.2.27.192/28	10.2.27.193 – 10.2.27.206	10.2.27.207
190	10.2.27.208/28	10.2.27.209 – 10.2.27.222	10.2.27.223
191	10.2.27.224/28	10.2.27.225 – 10.2.27.238	10.2.27.239
192	10.2.27.240/28	10.2.27.241 – 10.2.27.254	10.2.27.255
193	10.2.28.0/28	10.2.28.1 – 10.2.28.14	10.2.28.15
194	10.2.28.16/28	10.2.28.17 – 10.2.28.30	10.2.28.31
195	10.2.28.32/28	10.2.28.33 – 10.2.28.46	10.2.28.47
196	10.2.28.48/28	10.2.28.49 – 10.2.28.62	10.2.28.63
197	10.2.28.64/28	10.2.28.65 – 10.2.28.78	10.2.28.79
198	10.2.28.80/28	10.2.28.81 – 10.2.28.94	10.2.28.95
199	10.2.28.96/28	10.2.28.97 – 10.2.28.110	10.2.28.111
200	10.2.28.112/28	10.2.28.113 – 10.2.28.126	10.2.28.127
201	10.2.28.128/28	10.2.28.129 – 10.2.28.142	10.2.28.143
202	10.2.28.144/28	10.2.28.145 – 10.2.28.158	10.2.28.159
203	10.2.28.160/28	10.2.28.161 – 10.2.28.174	10.2.28.175
204	10.2.28.176/28	10.2.28.177 – 10.2.28.190	10.2.28.191
205	10.2.28.192/28	10.2.28.193 – 10.2.28.206	10.2.28.207
206	10.2.28.208/28	10.2.28.209 – 10.2.28.222	10.2.28.223
207	10.2.28.224/28	10.2.28.225 – 10.2.28.238	10.2.28.239
208	10.2.28.240/28	10.2.28.241 – 10.2.28.254	10.2.28.255
209	10.2.29.0/28	10.2.29.1 – 10.2.29.14	10.2.29.15
210	10.2.29.16/28	10.2.29.17 – 10.2.29.30	10.2.29.31
211	10.2.29.32/28	10.2.29.33 – 10.2.29.46	10.2.29.47
212	10.2.29.48/28	10.2.29.49 – 10.2.29.62	10.2.29.63
213	10.2.29.64/28	10.2.29.65 – 10.2.29.78	10.2.29.79
214	10.2.29.80/28	10.2.29.81 – 10.2.29.94	10.2.29.95
215	10.2.29.96/28	10.2.29.97 – 10.2.29.110	10.2.29.111
216	10.2.29.112/28	10.2.29.113 – 10.2.29.126	10.2.29.127
217	10.2.29.128/28	10.2.29.129 – 10.2.29.142	10.2.29.143
218	10.2.29.144/28	10.2.29.145 – 10.2.29.158	10.2.29.159
219	10.2.29.160/28	10.2.29.161 – 10.2.29.174	10.2.29.175
220	10.2.29.176/28	10.2.29.177 – 10.2.29.190	10.2.29.191
221	10.2.29.192/28	10.2.29.193 – 10.2.29.206	10.2.29.207
222	10.2.29.208/28	10.2.29.209 – 10.2.29.222	10.2.29.223
223	10.2.29.224/28	10.2.29.225 – 10.2.29.238	10.2.29.239
224	10.2.29.240/28	10.2.29.241 – 10.2.29.254	10.2.29.255
225	10.2.30.0/28	10.2.30.1 – 10.2.30.14	10.2.30.15
226	10.2.30.16/28	10.2.30.17 – 10.2.30.30	10.2.30.31
227	10.2.30.32/28	10.2.30.33 – 10.2.30.46	10.2.30.47
228	10.2.30.48/28	10.2.30.49 – 10.2.30.62	10.2.30.63
229	10.2.30.64/28	10.2.30.65 – 10.2.30.78	10.2.30.79
230	10.2.30.80/28	10.2.30.81 – 10.2.30.94	10.2.30.95
231	10.2.30.96/28	10.2.30.97 – 10.2.30.110	10.2.30.111
232	10.2.30.112/28	10.2.30.113 – 10.2.30.126	10.2.30.127
233	10.2.30.128/28	10.2.30.129 – 10.2.30.142	10.2.30.143
234	10.2.30.144/28	10.2.30.145 – 10.2.30.158	10.2.30.159
235	10.2.30.160/28	10.2.30.161 – 10.2.30.174	10.2.30.175
236	10.2.30.176/28	10.2.30.177 – 10.2.30.190	10.2.30.191
237	10.2.30.192/28	10.2.30.193 – 10.2.30.206	10.2.30.207
238	10.2.30.208/28	10.2.30.209 – 10.2.30.222	10.2.30.223
239	10.2.30.224/28	10.2.30.225 – 10.2.30.238	10.2.30.239
240	10.2.30.240/28	10.2.30.241 – 10.2.30.254	10.2.30.255
241	10.2.31.0/28	10.2.31.1 – 10.2.31.14	10.2.31.15
242	10.2.31.16/28	10.2.31.17 – 10.2.31.30	10.2.31.31
243	10.2.31.32/28	10.2.31.33 – 10.2.31.46	10.2.31.47
244	10.2.31.48/28	10.2.31.49 – 10.2.31.62	10.2.31.63
245	10.2.31.64/28	10.2.31.65 – 10.2.31.78	10.2.31.79
246	10.2.31.80/28	10.2.31.81 – 10.2.31.94	10.2.31.95
247	10.2.31.96/28	10.2.31.97 – 10.2.31.110	10.2.31.111
248	10.2.31.112/28	10.2.31.113 – 10.2.31.126	10.2.31.127
249	10.2.31.128/28	10.2.31.129 – 10.2.31.142	10.2.31.143
250	10.2.31.144/28	10.2.31.145 – 10.2.31.158	10.2.31.159
251	10.2.31.160/28	10.2.31.161 – 10.2.31.174	10.2.31.175
252	10.2.31.176/28	10.2.31.177 – 10.2.31.190	10.2.31.191
253	10.2.31.192/28	10.2.31.193 – 10.2.31.206	10.2.31.207
254	10.2.31.208/28	10.2.31.209 – 10.2.31.222	10.2.31.223
255	10.2.31.224/28	10.2.31.225 – 10.2.31.238	10.2.31.239
256	10.2.31.240/28	10.2.31.241 – 10.2.31.254	10.2.31.255

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 →