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)10.221.0.0/16

network10.221.0.0/16

broadcast10.221.255.255

first host10.221.0.1

last host10.221.255.254

subnet mask255.255.0.0

wildcard0.0.255.255

addresses65,536

usable hosts65,534

classA

ipcalc 10.221.0.0/16

address00001010.11011101.00000000.00000000

subnet mask11111111.11111111.00000000.00000000

network00001010.11011101.00000000.00000000

broadcast00001010.11011101.11111111.11111111

green = network part, grey = host part

hex0x0add0000

decimal182255616

reverse dns0.0.221.10.in-addr.arpa

ipv4-mapped::ffff:add:0

/16 split into /28 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.221.0.0/28	10.221.0.1 – 10.221.0.14	10.221.0.15
2	10.221.0.16/28	10.221.0.17 – 10.221.0.30	10.221.0.31
3	10.221.0.32/28	10.221.0.33 – 10.221.0.46	10.221.0.47
4	10.221.0.48/28	10.221.0.49 – 10.221.0.62	10.221.0.63
5	10.221.0.64/28	10.221.0.65 – 10.221.0.78	10.221.0.79
6	10.221.0.80/28	10.221.0.81 – 10.221.0.94	10.221.0.95
7	10.221.0.96/28	10.221.0.97 – 10.221.0.110	10.221.0.111
8	10.221.0.112/28	10.221.0.113 – 10.221.0.126	10.221.0.127
9	10.221.0.128/28	10.221.0.129 – 10.221.0.142	10.221.0.143
10	10.221.0.144/28	10.221.0.145 – 10.221.0.158	10.221.0.159
11	10.221.0.160/28	10.221.0.161 – 10.221.0.174	10.221.0.175
12	10.221.0.176/28	10.221.0.177 – 10.221.0.190	10.221.0.191
13	10.221.0.192/28	10.221.0.193 – 10.221.0.206	10.221.0.207
14	10.221.0.208/28	10.221.0.209 – 10.221.0.222	10.221.0.223
15	10.221.0.224/28	10.221.0.225 – 10.221.0.238	10.221.0.239
16	10.221.0.240/28	10.221.0.241 – 10.221.0.254	10.221.0.255
17	10.221.1.0/28	10.221.1.1 – 10.221.1.14	10.221.1.15
18	10.221.1.16/28	10.221.1.17 – 10.221.1.30	10.221.1.31
19	10.221.1.32/28	10.221.1.33 – 10.221.1.46	10.221.1.47
20	10.221.1.48/28	10.221.1.49 – 10.221.1.62	10.221.1.63
21	10.221.1.64/28	10.221.1.65 – 10.221.1.78	10.221.1.79
22	10.221.1.80/28	10.221.1.81 – 10.221.1.94	10.221.1.95
23	10.221.1.96/28	10.221.1.97 – 10.221.1.110	10.221.1.111
24	10.221.1.112/28	10.221.1.113 – 10.221.1.126	10.221.1.127
25	10.221.1.128/28	10.221.1.129 – 10.221.1.142	10.221.1.143
26	10.221.1.144/28	10.221.1.145 – 10.221.1.158	10.221.1.159
27	10.221.1.160/28	10.221.1.161 – 10.221.1.174	10.221.1.175
28	10.221.1.176/28	10.221.1.177 – 10.221.1.190	10.221.1.191
29	10.221.1.192/28	10.221.1.193 – 10.221.1.206	10.221.1.207
30	10.221.1.208/28	10.221.1.209 – 10.221.1.222	10.221.1.223
31	10.221.1.224/28	10.221.1.225 – 10.221.1.238	10.221.1.239
32	10.221.1.240/28	10.221.1.241 – 10.221.1.254	10.221.1.255
33	10.221.2.0/28	10.221.2.1 – 10.221.2.14	10.221.2.15
34	10.221.2.16/28	10.221.2.17 – 10.221.2.30	10.221.2.31
35	10.221.2.32/28	10.221.2.33 – 10.221.2.46	10.221.2.47
36	10.221.2.48/28	10.221.2.49 – 10.221.2.62	10.221.2.63
37	10.221.2.64/28	10.221.2.65 – 10.221.2.78	10.221.2.79
38	10.221.2.80/28	10.221.2.81 – 10.221.2.94	10.221.2.95
39	10.221.2.96/28	10.221.2.97 – 10.221.2.110	10.221.2.111
40	10.221.2.112/28	10.221.2.113 – 10.221.2.126	10.221.2.127
41	10.221.2.128/28	10.221.2.129 – 10.221.2.142	10.221.2.143
42	10.221.2.144/28	10.221.2.145 – 10.221.2.158	10.221.2.159
43	10.221.2.160/28	10.221.2.161 – 10.221.2.174	10.221.2.175
44	10.221.2.176/28	10.221.2.177 – 10.221.2.190	10.221.2.191
45	10.221.2.192/28	10.221.2.193 – 10.221.2.206	10.221.2.207
46	10.221.2.208/28	10.221.2.209 – 10.221.2.222	10.221.2.223
47	10.221.2.224/28	10.221.2.225 – 10.221.2.238	10.221.2.239
48	10.221.2.240/28	10.221.2.241 – 10.221.2.254	10.221.2.255
49	10.221.3.0/28	10.221.3.1 – 10.221.3.14	10.221.3.15
50	10.221.3.16/28	10.221.3.17 – 10.221.3.30	10.221.3.31
51	10.221.3.32/28	10.221.3.33 – 10.221.3.46	10.221.3.47
52	10.221.3.48/28	10.221.3.49 – 10.221.3.62	10.221.3.63
53	10.221.3.64/28	10.221.3.65 – 10.221.3.78	10.221.3.79
54	10.221.3.80/28	10.221.3.81 – 10.221.3.94	10.221.3.95
55	10.221.3.96/28	10.221.3.97 – 10.221.3.110	10.221.3.111
56	10.221.3.112/28	10.221.3.113 – 10.221.3.126	10.221.3.127
57	10.221.3.128/28	10.221.3.129 – 10.221.3.142	10.221.3.143
58	10.221.3.144/28	10.221.3.145 – 10.221.3.158	10.221.3.159
59	10.221.3.160/28	10.221.3.161 – 10.221.3.174	10.221.3.175
60	10.221.3.176/28	10.221.3.177 – 10.221.3.190	10.221.3.191
61	10.221.3.192/28	10.221.3.193 – 10.221.3.206	10.221.3.207
62	10.221.3.208/28	10.221.3.209 – 10.221.3.222	10.221.3.223
63	10.221.3.224/28	10.221.3.225 – 10.221.3.238	10.221.3.239
64	10.221.3.240/28	10.221.3.241 – 10.221.3.254	10.221.3.255
65	10.221.4.0/28	10.221.4.1 – 10.221.4.14	10.221.4.15
66	10.221.4.16/28	10.221.4.17 – 10.221.4.30	10.221.4.31
67	10.221.4.32/28	10.221.4.33 – 10.221.4.46	10.221.4.47
68	10.221.4.48/28	10.221.4.49 – 10.221.4.62	10.221.4.63
69	10.221.4.64/28	10.221.4.65 – 10.221.4.78	10.221.4.79
70	10.221.4.80/28	10.221.4.81 – 10.221.4.94	10.221.4.95
71	10.221.4.96/28	10.221.4.97 – 10.221.4.110	10.221.4.111
72	10.221.4.112/28	10.221.4.113 – 10.221.4.126	10.221.4.127
73	10.221.4.128/28	10.221.4.129 – 10.221.4.142	10.221.4.143
74	10.221.4.144/28	10.221.4.145 – 10.221.4.158	10.221.4.159
75	10.221.4.160/28	10.221.4.161 – 10.221.4.174	10.221.4.175
76	10.221.4.176/28	10.221.4.177 – 10.221.4.190	10.221.4.191
77	10.221.4.192/28	10.221.4.193 – 10.221.4.206	10.221.4.207
78	10.221.4.208/28	10.221.4.209 – 10.221.4.222	10.221.4.223
79	10.221.4.224/28	10.221.4.225 – 10.221.4.238	10.221.4.239
80	10.221.4.240/28	10.221.4.241 – 10.221.4.254	10.221.4.255
81	10.221.5.0/28	10.221.5.1 – 10.221.5.14	10.221.5.15
82	10.221.5.16/28	10.221.5.17 – 10.221.5.30	10.221.5.31
83	10.221.5.32/28	10.221.5.33 – 10.221.5.46	10.221.5.47
84	10.221.5.48/28	10.221.5.49 – 10.221.5.62	10.221.5.63
85	10.221.5.64/28	10.221.5.65 – 10.221.5.78	10.221.5.79
86	10.221.5.80/28	10.221.5.81 – 10.221.5.94	10.221.5.95
87	10.221.5.96/28	10.221.5.97 – 10.221.5.110	10.221.5.111
88	10.221.5.112/28	10.221.5.113 – 10.221.5.126	10.221.5.127
89	10.221.5.128/28	10.221.5.129 – 10.221.5.142	10.221.5.143
90	10.221.5.144/28	10.221.5.145 – 10.221.5.158	10.221.5.159
91	10.221.5.160/28	10.221.5.161 – 10.221.5.174	10.221.5.175
92	10.221.5.176/28	10.221.5.177 – 10.221.5.190	10.221.5.191
93	10.221.5.192/28	10.221.5.193 – 10.221.5.206	10.221.5.207
94	10.221.5.208/28	10.221.5.209 – 10.221.5.222	10.221.5.223
95	10.221.5.224/28	10.221.5.225 – 10.221.5.238	10.221.5.239
96	10.221.5.240/28	10.221.5.241 – 10.221.5.254	10.221.5.255
97	10.221.6.0/28	10.221.6.1 – 10.221.6.14	10.221.6.15
98	10.221.6.16/28	10.221.6.17 – 10.221.6.30	10.221.6.31
99	10.221.6.32/28	10.221.6.33 – 10.221.6.46	10.221.6.47
100	10.221.6.48/28	10.221.6.49 – 10.221.6.62	10.221.6.63
101	10.221.6.64/28	10.221.6.65 – 10.221.6.78	10.221.6.79
102	10.221.6.80/28	10.221.6.81 – 10.221.6.94	10.221.6.95
103	10.221.6.96/28	10.221.6.97 – 10.221.6.110	10.221.6.111
104	10.221.6.112/28	10.221.6.113 – 10.221.6.126	10.221.6.127
105	10.221.6.128/28	10.221.6.129 – 10.221.6.142	10.221.6.143
106	10.221.6.144/28	10.221.6.145 – 10.221.6.158	10.221.6.159
107	10.221.6.160/28	10.221.6.161 – 10.221.6.174	10.221.6.175
108	10.221.6.176/28	10.221.6.177 – 10.221.6.190	10.221.6.191
109	10.221.6.192/28	10.221.6.193 – 10.221.6.206	10.221.6.207
110	10.221.6.208/28	10.221.6.209 – 10.221.6.222	10.221.6.223
111	10.221.6.224/28	10.221.6.225 – 10.221.6.238	10.221.6.239
112	10.221.6.240/28	10.221.6.241 – 10.221.6.254	10.221.6.255
113	10.221.7.0/28	10.221.7.1 – 10.221.7.14	10.221.7.15
114	10.221.7.16/28	10.221.7.17 – 10.221.7.30	10.221.7.31
115	10.221.7.32/28	10.221.7.33 – 10.221.7.46	10.221.7.47
116	10.221.7.48/28	10.221.7.49 – 10.221.7.62	10.221.7.63
117	10.221.7.64/28	10.221.7.65 – 10.221.7.78	10.221.7.79
118	10.221.7.80/28	10.221.7.81 – 10.221.7.94	10.221.7.95
119	10.221.7.96/28	10.221.7.97 – 10.221.7.110	10.221.7.111
120	10.221.7.112/28	10.221.7.113 – 10.221.7.126	10.221.7.127
121	10.221.7.128/28	10.221.7.129 – 10.221.7.142	10.221.7.143
122	10.221.7.144/28	10.221.7.145 – 10.221.7.158	10.221.7.159
123	10.221.7.160/28	10.221.7.161 – 10.221.7.174	10.221.7.175
124	10.221.7.176/28	10.221.7.177 – 10.221.7.190	10.221.7.191
125	10.221.7.192/28	10.221.7.193 – 10.221.7.206	10.221.7.207
126	10.221.7.208/28	10.221.7.209 – 10.221.7.222	10.221.7.223
127	10.221.7.224/28	10.221.7.225 – 10.221.7.238	10.221.7.239
128	10.221.7.240/28	10.221.7.241 – 10.221.7.254	10.221.7.255
129	10.221.8.0/28	10.221.8.1 – 10.221.8.14	10.221.8.15
130	10.221.8.16/28	10.221.8.17 – 10.221.8.30	10.221.8.31
131	10.221.8.32/28	10.221.8.33 – 10.221.8.46	10.221.8.47
132	10.221.8.48/28	10.221.8.49 – 10.221.8.62	10.221.8.63
133	10.221.8.64/28	10.221.8.65 – 10.221.8.78	10.221.8.79
134	10.221.8.80/28	10.221.8.81 – 10.221.8.94	10.221.8.95
135	10.221.8.96/28	10.221.8.97 – 10.221.8.110	10.221.8.111
136	10.221.8.112/28	10.221.8.113 – 10.221.8.126	10.221.8.127
137	10.221.8.128/28	10.221.8.129 – 10.221.8.142	10.221.8.143
138	10.221.8.144/28	10.221.8.145 – 10.221.8.158	10.221.8.159
139	10.221.8.160/28	10.221.8.161 – 10.221.8.174	10.221.8.175
140	10.221.8.176/28	10.221.8.177 – 10.221.8.190	10.221.8.191
141	10.221.8.192/28	10.221.8.193 – 10.221.8.206	10.221.8.207
142	10.221.8.208/28	10.221.8.209 – 10.221.8.222	10.221.8.223
143	10.221.8.224/28	10.221.8.225 – 10.221.8.238	10.221.8.239
144	10.221.8.240/28	10.221.8.241 – 10.221.8.254	10.221.8.255
145	10.221.9.0/28	10.221.9.1 – 10.221.9.14	10.221.9.15
146	10.221.9.16/28	10.221.9.17 – 10.221.9.30	10.221.9.31
147	10.221.9.32/28	10.221.9.33 – 10.221.9.46	10.221.9.47
148	10.221.9.48/28	10.221.9.49 – 10.221.9.62	10.221.9.63
149	10.221.9.64/28	10.221.9.65 – 10.221.9.78	10.221.9.79
150	10.221.9.80/28	10.221.9.81 – 10.221.9.94	10.221.9.95
151	10.221.9.96/28	10.221.9.97 – 10.221.9.110	10.221.9.111
152	10.221.9.112/28	10.221.9.113 – 10.221.9.126	10.221.9.127
153	10.221.9.128/28	10.221.9.129 – 10.221.9.142	10.221.9.143
154	10.221.9.144/28	10.221.9.145 – 10.221.9.158	10.221.9.159
155	10.221.9.160/28	10.221.9.161 – 10.221.9.174	10.221.9.175
156	10.221.9.176/28	10.221.9.177 – 10.221.9.190	10.221.9.191
157	10.221.9.192/28	10.221.9.193 – 10.221.9.206	10.221.9.207
158	10.221.9.208/28	10.221.9.209 – 10.221.9.222	10.221.9.223
159	10.221.9.224/28	10.221.9.225 – 10.221.9.238	10.221.9.239
160	10.221.9.240/28	10.221.9.241 – 10.221.9.254	10.221.9.255
161	10.221.10.0/28	10.221.10.1 – 10.221.10.14	10.221.10.15
162	10.221.10.16/28	10.221.10.17 – 10.221.10.30	10.221.10.31
163	10.221.10.32/28	10.221.10.33 – 10.221.10.46	10.221.10.47
164	10.221.10.48/28	10.221.10.49 – 10.221.10.62	10.221.10.63
165	10.221.10.64/28	10.221.10.65 – 10.221.10.78	10.221.10.79
166	10.221.10.80/28	10.221.10.81 – 10.221.10.94	10.221.10.95
167	10.221.10.96/28	10.221.10.97 – 10.221.10.110	10.221.10.111
168	10.221.10.112/28	10.221.10.113 – 10.221.10.126	10.221.10.127
169	10.221.10.128/28	10.221.10.129 – 10.221.10.142	10.221.10.143
170	10.221.10.144/28	10.221.10.145 – 10.221.10.158	10.221.10.159
171	10.221.10.160/28	10.221.10.161 – 10.221.10.174	10.221.10.175
172	10.221.10.176/28	10.221.10.177 – 10.221.10.190	10.221.10.191
173	10.221.10.192/28	10.221.10.193 – 10.221.10.206	10.221.10.207
174	10.221.10.208/28	10.221.10.209 – 10.221.10.222	10.221.10.223
175	10.221.10.224/28	10.221.10.225 – 10.221.10.238	10.221.10.239
176	10.221.10.240/28	10.221.10.241 – 10.221.10.254	10.221.10.255
177	10.221.11.0/28	10.221.11.1 – 10.221.11.14	10.221.11.15
178	10.221.11.16/28	10.221.11.17 – 10.221.11.30	10.221.11.31
179	10.221.11.32/28	10.221.11.33 – 10.221.11.46	10.221.11.47
180	10.221.11.48/28	10.221.11.49 – 10.221.11.62	10.221.11.63
181	10.221.11.64/28	10.221.11.65 – 10.221.11.78	10.221.11.79
182	10.221.11.80/28	10.221.11.81 – 10.221.11.94	10.221.11.95
183	10.221.11.96/28	10.221.11.97 – 10.221.11.110	10.221.11.111
184	10.221.11.112/28	10.221.11.113 – 10.221.11.126	10.221.11.127
185	10.221.11.128/28	10.221.11.129 – 10.221.11.142	10.221.11.143
186	10.221.11.144/28	10.221.11.145 – 10.221.11.158	10.221.11.159
187	10.221.11.160/28	10.221.11.161 – 10.221.11.174	10.221.11.175
188	10.221.11.176/28	10.221.11.177 – 10.221.11.190	10.221.11.191
189	10.221.11.192/28	10.221.11.193 – 10.221.11.206	10.221.11.207
190	10.221.11.208/28	10.221.11.209 – 10.221.11.222	10.221.11.223
191	10.221.11.224/28	10.221.11.225 – 10.221.11.238	10.221.11.239
192	10.221.11.240/28	10.221.11.241 – 10.221.11.254	10.221.11.255
193	10.221.12.0/28	10.221.12.1 – 10.221.12.14	10.221.12.15
194	10.221.12.16/28	10.221.12.17 – 10.221.12.30	10.221.12.31
195	10.221.12.32/28	10.221.12.33 – 10.221.12.46	10.221.12.47
196	10.221.12.48/28	10.221.12.49 – 10.221.12.62	10.221.12.63
197	10.221.12.64/28	10.221.12.65 – 10.221.12.78	10.221.12.79
198	10.221.12.80/28	10.221.12.81 – 10.221.12.94	10.221.12.95
199	10.221.12.96/28	10.221.12.97 – 10.221.12.110	10.221.12.111
200	10.221.12.112/28	10.221.12.113 – 10.221.12.126	10.221.12.127
201	10.221.12.128/28	10.221.12.129 – 10.221.12.142	10.221.12.143
202	10.221.12.144/28	10.221.12.145 – 10.221.12.158	10.221.12.159
203	10.221.12.160/28	10.221.12.161 – 10.221.12.174	10.221.12.175
204	10.221.12.176/28	10.221.12.177 – 10.221.12.190	10.221.12.191
205	10.221.12.192/28	10.221.12.193 – 10.221.12.206	10.221.12.207
206	10.221.12.208/28	10.221.12.209 – 10.221.12.222	10.221.12.223
207	10.221.12.224/28	10.221.12.225 – 10.221.12.238	10.221.12.239
208	10.221.12.240/28	10.221.12.241 – 10.221.12.254	10.221.12.255
209	10.221.13.0/28	10.221.13.1 – 10.221.13.14	10.221.13.15
210	10.221.13.16/28	10.221.13.17 – 10.221.13.30	10.221.13.31
211	10.221.13.32/28	10.221.13.33 – 10.221.13.46	10.221.13.47
212	10.221.13.48/28	10.221.13.49 – 10.221.13.62	10.221.13.63
213	10.221.13.64/28	10.221.13.65 – 10.221.13.78	10.221.13.79
214	10.221.13.80/28	10.221.13.81 – 10.221.13.94	10.221.13.95
215	10.221.13.96/28	10.221.13.97 – 10.221.13.110	10.221.13.111
216	10.221.13.112/28	10.221.13.113 – 10.221.13.126	10.221.13.127
217	10.221.13.128/28	10.221.13.129 – 10.221.13.142	10.221.13.143
218	10.221.13.144/28	10.221.13.145 – 10.221.13.158	10.221.13.159
219	10.221.13.160/28	10.221.13.161 – 10.221.13.174	10.221.13.175
220	10.221.13.176/28	10.221.13.177 – 10.221.13.190	10.221.13.191
221	10.221.13.192/28	10.221.13.193 – 10.221.13.206	10.221.13.207
222	10.221.13.208/28	10.221.13.209 – 10.221.13.222	10.221.13.223
223	10.221.13.224/28	10.221.13.225 – 10.221.13.238	10.221.13.239
224	10.221.13.240/28	10.221.13.241 – 10.221.13.254	10.221.13.255
225	10.221.14.0/28	10.221.14.1 – 10.221.14.14	10.221.14.15
226	10.221.14.16/28	10.221.14.17 – 10.221.14.30	10.221.14.31
227	10.221.14.32/28	10.221.14.33 – 10.221.14.46	10.221.14.47
228	10.221.14.48/28	10.221.14.49 – 10.221.14.62	10.221.14.63
229	10.221.14.64/28	10.221.14.65 – 10.221.14.78	10.221.14.79
230	10.221.14.80/28	10.221.14.81 – 10.221.14.94	10.221.14.95
231	10.221.14.96/28	10.221.14.97 – 10.221.14.110	10.221.14.111
232	10.221.14.112/28	10.221.14.113 – 10.221.14.126	10.221.14.127
233	10.221.14.128/28	10.221.14.129 – 10.221.14.142	10.221.14.143
234	10.221.14.144/28	10.221.14.145 – 10.221.14.158	10.221.14.159
235	10.221.14.160/28	10.221.14.161 – 10.221.14.174	10.221.14.175
236	10.221.14.176/28	10.221.14.177 – 10.221.14.190	10.221.14.191
237	10.221.14.192/28	10.221.14.193 – 10.221.14.206	10.221.14.207
238	10.221.14.208/28	10.221.14.209 – 10.221.14.222	10.221.14.223
239	10.221.14.224/28	10.221.14.225 – 10.221.14.238	10.221.14.239
240	10.221.14.240/28	10.221.14.241 – 10.221.14.254	10.221.14.255
241	10.221.15.0/28	10.221.15.1 – 10.221.15.14	10.221.15.15
242	10.221.15.16/28	10.221.15.17 – 10.221.15.30	10.221.15.31
243	10.221.15.32/28	10.221.15.33 – 10.221.15.46	10.221.15.47
244	10.221.15.48/28	10.221.15.49 – 10.221.15.62	10.221.15.63
245	10.221.15.64/28	10.221.15.65 – 10.221.15.78	10.221.15.79
246	10.221.15.80/28	10.221.15.81 – 10.221.15.94	10.221.15.95
247	10.221.15.96/28	10.221.15.97 – 10.221.15.110	10.221.15.111
248	10.221.15.112/28	10.221.15.113 – 10.221.15.126	10.221.15.127
249	10.221.15.128/28	10.221.15.129 – 10.221.15.142	10.221.15.143
250	10.221.15.144/28	10.221.15.145 – 10.221.15.158	10.221.15.159
251	10.221.15.160/28	10.221.15.161 – 10.221.15.174	10.221.15.175
252	10.221.15.176/28	10.221.15.177 – 10.221.15.190	10.221.15.191
253	10.221.15.192/28	10.221.15.193 – 10.221.15.206	10.221.15.207
254	10.221.15.208/28	10.221.15.209 – 10.221.15.222	10.221.15.223
255	10.221.15.224/28	10.221.15.225 – 10.221.15.238	10.221.15.239
256	10.221.15.240/28	10.221.15.241 – 10.221.15.254	10.221.15.255

showing 256 of 4,096

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 /16
/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	1
/17	255.255.128.0	32,768	32,766	2 split →
/18	255.255.192.0	16,384	16,382	4 split →
/19	255.255.224.0	8,192	8,190	8 split →
/20	255.255.240.0	4,096	4,094	16 split →
/21	255.255.248.0	2,048	2,046	32 split →
/22	255.255.252.0	1,024	1,022	64 split →
/23	255.255.254.0	512	510	128 split →
/24	255.255.255.0	256	254	256 split →
/25	255.255.255.128	128	126	512 split →
/26	255.255.255.192	64	62	1,024 split →
/27	255.255.255.224	32	30	2,048 split →
/28	255.255.255.240	16	14	4,096 split →
/29	255.255.255.248	8	6	8,192 split →
/30	255.255.255.252	4	2	16,384 split →
/31	255.255.255.254	2	2	32,768 split →
/32	255.255.255.255	1	1	65,536 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 →