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)10.3.16.0/20

network10.3.16.0/20

broadcast10.3.31.255

first host10.3.16.1

last host10.3.31.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.16.0/20

address00001010.00000011.00010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.00010000.00000000

broadcast00001010.00000011.00011111.11111111

green = network part, grey = host part

hex0x0a031000

decimal167972864

reverse dns0.16.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:1000

/20 split into /28 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.16.0/28	10.3.16.1 – 10.3.16.14	10.3.16.15
2	10.3.16.16/28	10.3.16.17 – 10.3.16.30	10.3.16.31
3	10.3.16.32/28	10.3.16.33 – 10.3.16.46	10.3.16.47
4	10.3.16.48/28	10.3.16.49 – 10.3.16.62	10.3.16.63
5	10.3.16.64/28	10.3.16.65 – 10.3.16.78	10.3.16.79
6	10.3.16.80/28	10.3.16.81 – 10.3.16.94	10.3.16.95
7	10.3.16.96/28	10.3.16.97 – 10.3.16.110	10.3.16.111
8	10.3.16.112/28	10.3.16.113 – 10.3.16.126	10.3.16.127
9	10.3.16.128/28	10.3.16.129 – 10.3.16.142	10.3.16.143
10	10.3.16.144/28	10.3.16.145 – 10.3.16.158	10.3.16.159
11	10.3.16.160/28	10.3.16.161 – 10.3.16.174	10.3.16.175
12	10.3.16.176/28	10.3.16.177 – 10.3.16.190	10.3.16.191
13	10.3.16.192/28	10.3.16.193 – 10.3.16.206	10.3.16.207
14	10.3.16.208/28	10.3.16.209 – 10.3.16.222	10.3.16.223
15	10.3.16.224/28	10.3.16.225 – 10.3.16.238	10.3.16.239
16	10.3.16.240/28	10.3.16.241 – 10.3.16.254	10.3.16.255
17	10.3.17.0/28	10.3.17.1 – 10.3.17.14	10.3.17.15
18	10.3.17.16/28	10.3.17.17 – 10.3.17.30	10.3.17.31
19	10.3.17.32/28	10.3.17.33 – 10.3.17.46	10.3.17.47
20	10.3.17.48/28	10.3.17.49 – 10.3.17.62	10.3.17.63
21	10.3.17.64/28	10.3.17.65 – 10.3.17.78	10.3.17.79
22	10.3.17.80/28	10.3.17.81 – 10.3.17.94	10.3.17.95
23	10.3.17.96/28	10.3.17.97 – 10.3.17.110	10.3.17.111
24	10.3.17.112/28	10.3.17.113 – 10.3.17.126	10.3.17.127
25	10.3.17.128/28	10.3.17.129 – 10.3.17.142	10.3.17.143
26	10.3.17.144/28	10.3.17.145 – 10.3.17.158	10.3.17.159
27	10.3.17.160/28	10.3.17.161 – 10.3.17.174	10.3.17.175
28	10.3.17.176/28	10.3.17.177 – 10.3.17.190	10.3.17.191
29	10.3.17.192/28	10.3.17.193 – 10.3.17.206	10.3.17.207
30	10.3.17.208/28	10.3.17.209 – 10.3.17.222	10.3.17.223
31	10.3.17.224/28	10.3.17.225 – 10.3.17.238	10.3.17.239
32	10.3.17.240/28	10.3.17.241 – 10.3.17.254	10.3.17.255
33	10.3.18.0/28	10.3.18.1 – 10.3.18.14	10.3.18.15
34	10.3.18.16/28	10.3.18.17 – 10.3.18.30	10.3.18.31
35	10.3.18.32/28	10.3.18.33 – 10.3.18.46	10.3.18.47
36	10.3.18.48/28	10.3.18.49 – 10.3.18.62	10.3.18.63
37	10.3.18.64/28	10.3.18.65 – 10.3.18.78	10.3.18.79
38	10.3.18.80/28	10.3.18.81 – 10.3.18.94	10.3.18.95
39	10.3.18.96/28	10.3.18.97 – 10.3.18.110	10.3.18.111
40	10.3.18.112/28	10.3.18.113 – 10.3.18.126	10.3.18.127
41	10.3.18.128/28	10.3.18.129 – 10.3.18.142	10.3.18.143
42	10.3.18.144/28	10.3.18.145 – 10.3.18.158	10.3.18.159
43	10.3.18.160/28	10.3.18.161 – 10.3.18.174	10.3.18.175
44	10.3.18.176/28	10.3.18.177 – 10.3.18.190	10.3.18.191
45	10.3.18.192/28	10.3.18.193 – 10.3.18.206	10.3.18.207
46	10.3.18.208/28	10.3.18.209 – 10.3.18.222	10.3.18.223
47	10.3.18.224/28	10.3.18.225 – 10.3.18.238	10.3.18.239
48	10.3.18.240/28	10.3.18.241 – 10.3.18.254	10.3.18.255
49	10.3.19.0/28	10.3.19.1 – 10.3.19.14	10.3.19.15
50	10.3.19.16/28	10.3.19.17 – 10.3.19.30	10.3.19.31
51	10.3.19.32/28	10.3.19.33 – 10.3.19.46	10.3.19.47
52	10.3.19.48/28	10.3.19.49 – 10.3.19.62	10.3.19.63
53	10.3.19.64/28	10.3.19.65 – 10.3.19.78	10.3.19.79
54	10.3.19.80/28	10.3.19.81 – 10.3.19.94	10.3.19.95
55	10.3.19.96/28	10.3.19.97 – 10.3.19.110	10.3.19.111
56	10.3.19.112/28	10.3.19.113 – 10.3.19.126	10.3.19.127
57	10.3.19.128/28	10.3.19.129 – 10.3.19.142	10.3.19.143
58	10.3.19.144/28	10.3.19.145 – 10.3.19.158	10.3.19.159
59	10.3.19.160/28	10.3.19.161 – 10.3.19.174	10.3.19.175
60	10.3.19.176/28	10.3.19.177 – 10.3.19.190	10.3.19.191
61	10.3.19.192/28	10.3.19.193 – 10.3.19.206	10.3.19.207
62	10.3.19.208/28	10.3.19.209 – 10.3.19.222	10.3.19.223
63	10.3.19.224/28	10.3.19.225 – 10.3.19.238	10.3.19.239
64	10.3.19.240/28	10.3.19.241 – 10.3.19.254	10.3.19.255
65	10.3.20.0/28	10.3.20.1 – 10.3.20.14	10.3.20.15
66	10.3.20.16/28	10.3.20.17 – 10.3.20.30	10.3.20.31
67	10.3.20.32/28	10.3.20.33 – 10.3.20.46	10.3.20.47
68	10.3.20.48/28	10.3.20.49 – 10.3.20.62	10.3.20.63
69	10.3.20.64/28	10.3.20.65 – 10.3.20.78	10.3.20.79
70	10.3.20.80/28	10.3.20.81 – 10.3.20.94	10.3.20.95
71	10.3.20.96/28	10.3.20.97 – 10.3.20.110	10.3.20.111
72	10.3.20.112/28	10.3.20.113 – 10.3.20.126	10.3.20.127
73	10.3.20.128/28	10.3.20.129 – 10.3.20.142	10.3.20.143
74	10.3.20.144/28	10.3.20.145 – 10.3.20.158	10.3.20.159
75	10.3.20.160/28	10.3.20.161 – 10.3.20.174	10.3.20.175
76	10.3.20.176/28	10.3.20.177 – 10.3.20.190	10.3.20.191
77	10.3.20.192/28	10.3.20.193 – 10.3.20.206	10.3.20.207
78	10.3.20.208/28	10.3.20.209 – 10.3.20.222	10.3.20.223
79	10.3.20.224/28	10.3.20.225 – 10.3.20.238	10.3.20.239
80	10.3.20.240/28	10.3.20.241 – 10.3.20.254	10.3.20.255
81	10.3.21.0/28	10.3.21.1 – 10.3.21.14	10.3.21.15
82	10.3.21.16/28	10.3.21.17 – 10.3.21.30	10.3.21.31
83	10.3.21.32/28	10.3.21.33 – 10.3.21.46	10.3.21.47
84	10.3.21.48/28	10.3.21.49 – 10.3.21.62	10.3.21.63
85	10.3.21.64/28	10.3.21.65 – 10.3.21.78	10.3.21.79
86	10.3.21.80/28	10.3.21.81 – 10.3.21.94	10.3.21.95
87	10.3.21.96/28	10.3.21.97 – 10.3.21.110	10.3.21.111
88	10.3.21.112/28	10.3.21.113 – 10.3.21.126	10.3.21.127
89	10.3.21.128/28	10.3.21.129 – 10.3.21.142	10.3.21.143
90	10.3.21.144/28	10.3.21.145 – 10.3.21.158	10.3.21.159
91	10.3.21.160/28	10.3.21.161 – 10.3.21.174	10.3.21.175
92	10.3.21.176/28	10.3.21.177 – 10.3.21.190	10.3.21.191
93	10.3.21.192/28	10.3.21.193 – 10.3.21.206	10.3.21.207
94	10.3.21.208/28	10.3.21.209 – 10.3.21.222	10.3.21.223
95	10.3.21.224/28	10.3.21.225 – 10.3.21.238	10.3.21.239
96	10.3.21.240/28	10.3.21.241 – 10.3.21.254	10.3.21.255
97	10.3.22.0/28	10.3.22.1 – 10.3.22.14	10.3.22.15
98	10.3.22.16/28	10.3.22.17 – 10.3.22.30	10.3.22.31
99	10.3.22.32/28	10.3.22.33 – 10.3.22.46	10.3.22.47
100	10.3.22.48/28	10.3.22.49 – 10.3.22.62	10.3.22.63
101	10.3.22.64/28	10.3.22.65 – 10.3.22.78	10.3.22.79
102	10.3.22.80/28	10.3.22.81 – 10.3.22.94	10.3.22.95
103	10.3.22.96/28	10.3.22.97 – 10.3.22.110	10.3.22.111
104	10.3.22.112/28	10.3.22.113 – 10.3.22.126	10.3.22.127
105	10.3.22.128/28	10.3.22.129 – 10.3.22.142	10.3.22.143
106	10.3.22.144/28	10.3.22.145 – 10.3.22.158	10.3.22.159
107	10.3.22.160/28	10.3.22.161 – 10.3.22.174	10.3.22.175
108	10.3.22.176/28	10.3.22.177 – 10.3.22.190	10.3.22.191
109	10.3.22.192/28	10.3.22.193 – 10.3.22.206	10.3.22.207
110	10.3.22.208/28	10.3.22.209 – 10.3.22.222	10.3.22.223
111	10.3.22.224/28	10.3.22.225 – 10.3.22.238	10.3.22.239
112	10.3.22.240/28	10.3.22.241 – 10.3.22.254	10.3.22.255
113	10.3.23.0/28	10.3.23.1 – 10.3.23.14	10.3.23.15
114	10.3.23.16/28	10.3.23.17 – 10.3.23.30	10.3.23.31
115	10.3.23.32/28	10.3.23.33 – 10.3.23.46	10.3.23.47
116	10.3.23.48/28	10.3.23.49 – 10.3.23.62	10.3.23.63
117	10.3.23.64/28	10.3.23.65 – 10.3.23.78	10.3.23.79
118	10.3.23.80/28	10.3.23.81 – 10.3.23.94	10.3.23.95
119	10.3.23.96/28	10.3.23.97 – 10.3.23.110	10.3.23.111
120	10.3.23.112/28	10.3.23.113 – 10.3.23.126	10.3.23.127
121	10.3.23.128/28	10.3.23.129 – 10.3.23.142	10.3.23.143
122	10.3.23.144/28	10.3.23.145 – 10.3.23.158	10.3.23.159
123	10.3.23.160/28	10.3.23.161 – 10.3.23.174	10.3.23.175
124	10.3.23.176/28	10.3.23.177 – 10.3.23.190	10.3.23.191
125	10.3.23.192/28	10.3.23.193 – 10.3.23.206	10.3.23.207
126	10.3.23.208/28	10.3.23.209 – 10.3.23.222	10.3.23.223
127	10.3.23.224/28	10.3.23.225 – 10.3.23.238	10.3.23.239
128	10.3.23.240/28	10.3.23.241 – 10.3.23.254	10.3.23.255
129	10.3.24.0/28	10.3.24.1 – 10.3.24.14	10.3.24.15
130	10.3.24.16/28	10.3.24.17 – 10.3.24.30	10.3.24.31
131	10.3.24.32/28	10.3.24.33 – 10.3.24.46	10.3.24.47
132	10.3.24.48/28	10.3.24.49 – 10.3.24.62	10.3.24.63
133	10.3.24.64/28	10.3.24.65 – 10.3.24.78	10.3.24.79
134	10.3.24.80/28	10.3.24.81 – 10.3.24.94	10.3.24.95
135	10.3.24.96/28	10.3.24.97 – 10.3.24.110	10.3.24.111
136	10.3.24.112/28	10.3.24.113 – 10.3.24.126	10.3.24.127
137	10.3.24.128/28	10.3.24.129 – 10.3.24.142	10.3.24.143
138	10.3.24.144/28	10.3.24.145 – 10.3.24.158	10.3.24.159
139	10.3.24.160/28	10.3.24.161 – 10.3.24.174	10.3.24.175
140	10.3.24.176/28	10.3.24.177 – 10.3.24.190	10.3.24.191
141	10.3.24.192/28	10.3.24.193 – 10.3.24.206	10.3.24.207
142	10.3.24.208/28	10.3.24.209 – 10.3.24.222	10.3.24.223
143	10.3.24.224/28	10.3.24.225 – 10.3.24.238	10.3.24.239
144	10.3.24.240/28	10.3.24.241 – 10.3.24.254	10.3.24.255
145	10.3.25.0/28	10.3.25.1 – 10.3.25.14	10.3.25.15
146	10.3.25.16/28	10.3.25.17 – 10.3.25.30	10.3.25.31
147	10.3.25.32/28	10.3.25.33 – 10.3.25.46	10.3.25.47
148	10.3.25.48/28	10.3.25.49 – 10.3.25.62	10.3.25.63
149	10.3.25.64/28	10.3.25.65 – 10.3.25.78	10.3.25.79
150	10.3.25.80/28	10.3.25.81 – 10.3.25.94	10.3.25.95
151	10.3.25.96/28	10.3.25.97 – 10.3.25.110	10.3.25.111
152	10.3.25.112/28	10.3.25.113 – 10.3.25.126	10.3.25.127
153	10.3.25.128/28	10.3.25.129 – 10.3.25.142	10.3.25.143
154	10.3.25.144/28	10.3.25.145 – 10.3.25.158	10.3.25.159
155	10.3.25.160/28	10.3.25.161 – 10.3.25.174	10.3.25.175
156	10.3.25.176/28	10.3.25.177 – 10.3.25.190	10.3.25.191
157	10.3.25.192/28	10.3.25.193 – 10.3.25.206	10.3.25.207
158	10.3.25.208/28	10.3.25.209 – 10.3.25.222	10.3.25.223
159	10.3.25.224/28	10.3.25.225 – 10.3.25.238	10.3.25.239
160	10.3.25.240/28	10.3.25.241 – 10.3.25.254	10.3.25.255
161	10.3.26.0/28	10.3.26.1 – 10.3.26.14	10.3.26.15
162	10.3.26.16/28	10.3.26.17 – 10.3.26.30	10.3.26.31
163	10.3.26.32/28	10.3.26.33 – 10.3.26.46	10.3.26.47
164	10.3.26.48/28	10.3.26.49 – 10.3.26.62	10.3.26.63
165	10.3.26.64/28	10.3.26.65 – 10.3.26.78	10.3.26.79
166	10.3.26.80/28	10.3.26.81 – 10.3.26.94	10.3.26.95
167	10.3.26.96/28	10.3.26.97 – 10.3.26.110	10.3.26.111
168	10.3.26.112/28	10.3.26.113 – 10.3.26.126	10.3.26.127
169	10.3.26.128/28	10.3.26.129 – 10.3.26.142	10.3.26.143
170	10.3.26.144/28	10.3.26.145 – 10.3.26.158	10.3.26.159
171	10.3.26.160/28	10.3.26.161 – 10.3.26.174	10.3.26.175
172	10.3.26.176/28	10.3.26.177 – 10.3.26.190	10.3.26.191
173	10.3.26.192/28	10.3.26.193 – 10.3.26.206	10.3.26.207
174	10.3.26.208/28	10.3.26.209 – 10.3.26.222	10.3.26.223
175	10.3.26.224/28	10.3.26.225 – 10.3.26.238	10.3.26.239
176	10.3.26.240/28	10.3.26.241 – 10.3.26.254	10.3.26.255
177	10.3.27.0/28	10.3.27.1 – 10.3.27.14	10.3.27.15
178	10.3.27.16/28	10.3.27.17 – 10.3.27.30	10.3.27.31
179	10.3.27.32/28	10.3.27.33 – 10.3.27.46	10.3.27.47
180	10.3.27.48/28	10.3.27.49 – 10.3.27.62	10.3.27.63
181	10.3.27.64/28	10.3.27.65 – 10.3.27.78	10.3.27.79
182	10.3.27.80/28	10.3.27.81 – 10.3.27.94	10.3.27.95
183	10.3.27.96/28	10.3.27.97 – 10.3.27.110	10.3.27.111
184	10.3.27.112/28	10.3.27.113 – 10.3.27.126	10.3.27.127
185	10.3.27.128/28	10.3.27.129 – 10.3.27.142	10.3.27.143
186	10.3.27.144/28	10.3.27.145 – 10.3.27.158	10.3.27.159
187	10.3.27.160/28	10.3.27.161 – 10.3.27.174	10.3.27.175
188	10.3.27.176/28	10.3.27.177 – 10.3.27.190	10.3.27.191
189	10.3.27.192/28	10.3.27.193 – 10.3.27.206	10.3.27.207
190	10.3.27.208/28	10.3.27.209 – 10.3.27.222	10.3.27.223
191	10.3.27.224/28	10.3.27.225 – 10.3.27.238	10.3.27.239
192	10.3.27.240/28	10.3.27.241 – 10.3.27.254	10.3.27.255
193	10.3.28.0/28	10.3.28.1 – 10.3.28.14	10.3.28.15
194	10.3.28.16/28	10.3.28.17 – 10.3.28.30	10.3.28.31
195	10.3.28.32/28	10.3.28.33 – 10.3.28.46	10.3.28.47
196	10.3.28.48/28	10.3.28.49 – 10.3.28.62	10.3.28.63
197	10.3.28.64/28	10.3.28.65 – 10.3.28.78	10.3.28.79
198	10.3.28.80/28	10.3.28.81 – 10.3.28.94	10.3.28.95
199	10.3.28.96/28	10.3.28.97 – 10.3.28.110	10.3.28.111
200	10.3.28.112/28	10.3.28.113 – 10.3.28.126	10.3.28.127
201	10.3.28.128/28	10.3.28.129 – 10.3.28.142	10.3.28.143
202	10.3.28.144/28	10.3.28.145 – 10.3.28.158	10.3.28.159
203	10.3.28.160/28	10.3.28.161 – 10.3.28.174	10.3.28.175
204	10.3.28.176/28	10.3.28.177 – 10.3.28.190	10.3.28.191
205	10.3.28.192/28	10.3.28.193 – 10.3.28.206	10.3.28.207
206	10.3.28.208/28	10.3.28.209 – 10.3.28.222	10.3.28.223
207	10.3.28.224/28	10.3.28.225 – 10.3.28.238	10.3.28.239
208	10.3.28.240/28	10.3.28.241 – 10.3.28.254	10.3.28.255
209	10.3.29.0/28	10.3.29.1 – 10.3.29.14	10.3.29.15
210	10.3.29.16/28	10.3.29.17 – 10.3.29.30	10.3.29.31
211	10.3.29.32/28	10.3.29.33 – 10.3.29.46	10.3.29.47
212	10.3.29.48/28	10.3.29.49 – 10.3.29.62	10.3.29.63
213	10.3.29.64/28	10.3.29.65 – 10.3.29.78	10.3.29.79
214	10.3.29.80/28	10.3.29.81 – 10.3.29.94	10.3.29.95
215	10.3.29.96/28	10.3.29.97 – 10.3.29.110	10.3.29.111
216	10.3.29.112/28	10.3.29.113 – 10.3.29.126	10.3.29.127
217	10.3.29.128/28	10.3.29.129 – 10.3.29.142	10.3.29.143
218	10.3.29.144/28	10.3.29.145 – 10.3.29.158	10.3.29.159
219	10.3.29.160/28	10.3.29.161 – 10.3.29.174	10.3.29.175
220	10.3.29.176/28	10.3.29.177 – 10.3.29.190	10.3.29.191
221	10.3.29.192/28	10.3.29.193 – 10.3.29.206	10.3.29.207
222	10.3.29.208/28	10.3.29.209 – 10.3.29.222	10.3.29.223
223	10.3.29.224/28	10.3.29.225 – 10.3.29.238	10.3.29.239
224	10.3.29.240/28	10.3.29.241 – 10.3.29.254	10.3.29.255
225	10.3.30.0/28	10.3.30.1 – 10.3.30.14	10.3.30.15
226	10.3.30.16/28	10.3.30.17 – 10.3.30.30	10.3.30.31
227	10.3.30.32/28	10.3.30.33 – 10.3.30.46	10.3.30.47
228	10.3.30.48/28	10.3.30.49 – 10.3.30.62	10.3.30.63
229	10.3.30.64/28	10.3.30.65 – 10.3.30.78	10.3.30.79
230	10.3.30.80/28	10.3.30.81 – 10.3.30.94	10.3.30.95
231	10.3.30.96/28	10.3.30.97 – 10.3.30.110	10.3.30.111
232	10.3.30.112/28	10.3.30.113 – 10.3.30.126	10.3.30.127
233	10.3.30.128/28	10.3.30.129 – 10.3.30.142	10.3.30.143
234	10.3.30.144/28	10.3.30.145 – 10.3.30.158	10.3.30.159
235	10.3.30.160/28	10.3.30.161 – 10.3.30.174	10.3.30.175
236	10.3.30.176/28	10.3.30.177 – 10.3.30.190	10.3.30.191
237	10.3.30.192/28	10.3.30.193 – 10.3.30.206	10.3.30.207
238	10.3.30.208/28	10.3.30.209 – 10.3.30.222	10.3.30.223
239	10.3.30.224/28	10.3.30.225 – 10.3.30.238	10.3.30.239
240	10.3.30.240/28	10.3.30.241 – 10.3.30.254	10.3.30.255
241	10.3.31.0/28	10.3.31.1 – 10.3.31.14	10.3.31.15
242	10.3.31.16/28	10.3.31.17 – 10.3.31.30	10.3.31.31
243	10.3.31.32/28	10.3.31.33 – 10.3.31.46	10.3.31.47
244	10.3.31.48/28	10.3.31.49 – 10.3.31.62	10.3.31.63
245	10.3.31.64/28	10.3.31.65 – 10.3.31.78	10.3.31.79
246	10.3.31.80/28	10.3.31.81 – 10.3.31.94	10.3.31.95
247	10.3.31.96/28	10.3.31.97 – 10.3.31.110	10.3.31.111
248	10.3.31.112/28	10.3.31.113 – 10.3.31.126	10.3.31.127
249	10.3.31.128/28	10.3.31.129 – 10.3.31.142	10.3.31.143
250	10.3.31.144/28	10.3.31.145 – 10.3.31.158	10.3.31.159
251	10.3.31.160/28	10.3.31.161 – 10.3.31.174	10.3.31.175
252	10.3.31.176/28	10.3.31.177 – 10.3.31.190	10.3.31.191
253	10.3.31.192/28	10.3.31.193 – 10.3.31.206	10.3.31.207
254	10.3.31.208/28	10.3.31.209 – 10.3.31.222	10.3.31.223
255	10.3.31.224/28	10.3.31.225 – 10.3.31.238	10.3.31.239
256	10.3.31.240/28	10.3.31.241 – 10.3.31.254	10.3.31.255

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 →