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 /29 · 8,192 subnets

close ×

#	network	host range	broadcast
1	10.221.0.0/29	10.221.0.1 – 10.221.0.6	10.221.0.7
2	10.221.0.8/29	10.221.0.9 – 10.221.0.14	10.221.0.15
3	10.221.0.16/29	10.221.0.17 – 10.221.0.22	10.221.0.23
4	10.221.0.24/29	10.221.0.25 – 10.221.0.30	10.221.0.31
5	10.221.0.32/29	10.221.0.33 – 10.221.0.38	10.221.0.39
6	10.221.0.40/29	10.221.0.41 – 10.221.0.46	10.221.0.47
7	10.221.0.48/29	10.221.0.49 – 10.221.0.54	10.221.0.55
8	10.221.0.56/29	10.221.0.57 – 10.221.0.62	10.221.0.63
9	10.221.0.64/29	10.221.0.65 – 10.221.0.70	10.221.0.71
10	10.221.0.72/29	10.221.0.73 – 10.221.0.78	10.221.0.79
11	10.221.0.80/29	10.221.0.81 – 10.221.0.86	10.221.0.87
12	10.221.0.88/29	10.221.0.89 – 10.221.0.94	10.221.0.95
13	10.221.0.96/29	10.221.0.97 – 10.221.0.102	10.221.0.103
14	10.221.0.104/29	10.221.0.105 – 10.221.0.110	10.221.0.111
15	10.221.0.112/29	10.221.0.113 – 10.221.0.118	10.221.0.119
16	10.221.0.120/29	10.221.0.121 – 10.221.0.126	10.221.0.127
17	10.221.0.128/29	10.221.0.129 – 10.221.0.134	10.221.0.135
18	10.221.0.136/29	10.221.0.137 – 10.221.0.142	10.221.0.143
19	10.221.0.144/29	10.221.0.145 – 10.221.0.150	10.221.0.151
20	10.221.0.152/29	10.221.0.153 – 10.221.0.158	10.221.0.159
21	10.221.0.160/29	10.221.0.161 – 10.221.0.166	10.221.0.167
22	10.221.0.168/29	10.221.0.169 – 10.221.0.174	10.221.0.175
23	10.221.0.176/29	10.221.0.177 – 10.221.0.182	10.221.0.183
24	10.221.0.184/29	10.221.0.185 – 10.221.0.190	10.221.0.191
25	10.221.0.192/29	10.221.0.193 – 10.221.0.198	10.221.0.199
26	10.221.0.200/29	10.221.0.201 – 10.221.0.206	10.221.0.207
27	10.221.0.208/29	10.221.0.209 – 10.221.0.214	10.221.0.215
28	10.221.0.216/29	10.221.0.217 – 10.221.0.222	10.221.0.223
29	10.221.0.224/29	10.221.0.225 – 10.221.0.230	10.221.0.231
30	10.221.0.232/29	10.221.0.233 – 10.221.0.238	10.221.0.239
31	10.221.0.240/29	10.221.0.241 – 10.221.0.246	10.221.0.247
32	10.221.0.248/29	10.221.0.249 – 10.221.0.254	10.221.0.255
33	10.221.1.0/29	10.221.1.1 – 10.221.1.6	10.221.1.7
34	10.221.1.8/29	10.221.1.9 – 10.221.1.14	10.221.1.15
35	10.221.1.16/29	10.221.1.17 – 10.221.1.22	10.221.1.23
36	10.221.1.24/29	10.221.1.25 – 10.221.1.30	10.221.1.31
37	10.221.1.32/29	10.221.1.33 – 10.221.1.38	10.221.1.39
38	10.221.1.40/29	10.221.1.41 – 10.221.1.46	10.221.1.47
39	10.221.1.48/29	10.221.1.49 – 10.221.1.54	10.221.1.55
40	10.221.1.56/29	10.221.1.57 – 10.221.1.62	10.221.1.63
41	10.221.1.64/29	10.221.1.65 – 10.221.1.70	10.221.1.71
42	10.221.1.72/29	10.221.1.73 – 10.221.1.78	10.221.1.79
43	10.221.1.80/29	10.221.1.81 – 10.221.1.86	10.221.1.87
44	10.221.1.88/29	10.221.1.89 – 10.221.1.94	10.221.1.95
45	10.221.1.96/29	10.221.1.97 – 10.221.1.102	10.221.1.103
46	10.221.1.104/29	10.221.1.105 – 10.221.1.110	10.221.1.111
47	10.221.1.112/29	10.221.1.113 – 10.221.1.118	10.221.1.119
48	10.221.1.120/29	10.221.1.121 – 10.221.1.126	10.221.1.127
49	10.221.1.128/29	10.221.1.129 – 10.221.1.134	10.221.1.135
50	10.221.1.136/29	10.221.1.137 – 10.221.1.142	10.221.1.143
51	10.221.1.144/29	10.221.1.145 – 10.221.1.150	10.221.1.151
52	10.221.1.152/29	10.221.1.153 – 10.221.1.158	10.221.1.159
53	10.221.1.160/29	10.221.1.161 – 10.221.1.166	10.221.1.167
54	10.221.1.168/29	10.221.1.169 – 10.221.1.174	10.221.1.175
55	10.221.1.176/29	10.221.1.177 – 10.221.1.182	10.221.1.183
56	10.221.1.184/29	10.221.1.185 – 10.221.1.190	10.221.1.191
57	10.221.1.192/29	10.221.1.193 – 10.221.1.198	10.221.1.199
58	10.221.1.200/29	10.221.1.201 – 10.221.1.206	10.221.1.207
59	10.221.1.208/29	10.221.1.209 – 10.221.1.214	10.221.1.215
60	10.221.1.216/29	10.221.1.217 – 10.221.1.222	10.221.1.223
61	10.221.1.224/29	10.221.1.225 – 10.221.1.230	10.221.1.231
62	10.221.1.232/29	10.221.1.233 – 10.221.1.238	10.221.1.239
63	10.221.1.240/29	10.221.1.241 – 10.221.1.246	10.221.1.247
64	10.221.1.248/29	10.221.1.249 – 10.221.1.254	10.221.1.255
65	10.221.2.0/29	10.221.2.1 – 10.221.2.6	10.221.2.7
66	10.221.2.8/29	10.221.2.9 – 10.221.2.14	10.221.2.15
67	10.221.2.16/29	10.221.2.17 – 10.221.2.22	10.221.2.23
68	10.221.2.24/29	10.221.2.25 – 10.221.2.30	10.221.2.31
69	10.221.2.32/29	10.221.2.33 – 10.221.2.38	10.221.2.39
70	10.221.2.40/29	10.221.2.41 – 10.221.2.46	10.221.2.47
71	10.221.2.48/29	10.221.2.49 – 10.221.2.54	10.221.2.55
72	10.221.2.56/29	10.221.2.57 – 10.221.2.62	10.221.2.63
73	10.221.2.64/29	10.221.2.65 – 10.221.2.70	10.221.2.71
74	10.221.2.72/29	10.221.2.73 – 10.221.2.78	10.221.2.79
75	10.221.2.80/29	10.221.2.81 – 10.221.2.86	10.221.2.87
76	10.221.2.88/29	10.221.2.89 – 10.221.2.94	10.221.2.95
77	10.221.2.96/29	10.221.2.97 – 10.221.2.102	10.221.2.103
78	10.221.2.104/29	10.221.2.105 – 10.221.2.110	10.221.2.111
79	10.221.2.112/29	10.221.2.113 – 10.221.2.118	10.221.2.119
80	10.221.2.120/29	10.221.2.121 – 10.221.2.126	10.221.2.127
81	10.221.2.128/29	10.221.2.129 – 10.221.2.134	10.221.2.135
82	10.221.2.136/29	10.221.2.137 – 10.221.2.142	10.221.2.143
83	10.221.2.144/29	10.221.2.145 – 10.221.2.150	10.221.2.151
84	10.221.2.152/29	10.221.2.153 – 10.221.2.158	10.221.2.159
85	10.221.2.160/29	10.221.2.161 – 10.221.2.166	10.221.2.167
86	10.221.2.168/29	10.221.2.169 – 10.221.2.174	10.221.2.175
87	10.221.2.176/29	10.221.2.177 – 10.221.2.182	10.221.2.183
88	10.221.2.184/29	10.221.2.185 – 10.221.2.190	10.221.2.191
89	10.221.2.192/29	10.221.2.193 – 10.221.2.198	10.221.2.199
90	10.221.2.200/29	10.221.2.201 – 10.221.2.206	10.221.2.207
91	10.221.2.208/29	10.221.2.209 – 10.221.2.214	10.221.2.215
92	10.221.2.216/29	10.221.2.217 – 10.221.2.222	10.221.2.223
93	10.221.2.224/29	10.221.2.225 – 10.221.2.230	10.221.2.231
94	10.221.2.232/29	10.221.2.233 – 10.221.2.238	10.221.2.239
95	10.221.2.240/29	10.221.2.241 – 10.221.2.246	10.221.2.247
96	10.221.2.248/29	10.221.2.249 – 10.221.2.254	10.221.2.255
97	10.221.3.0/29	10.221.3.1 – 10.221.3.6	10.221.3.7
98	10.221.3.8/29	10.221.3.9 – 10.221.3.14	10.221.3.15
99	10.221.3.16/29	10.221.3.17 – 10.221.3.22	10.221.3.23
100	10.221.3.24/29	10.221.3.25 – 10.221.3.30	10.221.3.31
101	10.221.3.32/29	10.221.3.33 – 10.221.3.38	10.221.3.39
102	10.221.3.40/29	10.221.3.41 – 10.221.3.46	10.221.3.47
103	10.221.3.48/29	10.221.3.49 – 10.221.3.54	10.221.3.55
104	10.221.3.56/29	10.221.3.57 – 10.221.3.62	10.221.3.63
105	10.221.3.64/29	10.221.3.65 – 10.221.3.70	10.221.3.71
106	10.221.3.72/29	10.221.3.73 – 10.221.3.78	10.221.3.79
107	10.221.3.80/29	10.221.3.81 – 10.221.3.86	10.221.3.87
108	10.221.3.88/29	10.221.3.89 – 10.221.3.94	10.221.3.95
109	10.221.3.96/29	10.221.3.97 – 10.221.3.102	10.221.3.103
110	10.221.3.104/29	10.221.3.105 – 10.221.3.110	10.221.3.111
111	10.221.3.112/29	10.221.3.113 – 10.221.3.118	10.221.3.119
112	10.221.3.120/29	10.221.3.121 – 10.221.3.126	10.221.3.127
113	10.221.3.128/29	10.221.3.129 – 10.221.3.134	10.221.3.135
114	10.221.3.136/29	10.221.3.137 – 10.221.3.142	10.221.3.143
115	10.221.3.144/29	10.221.3.145 – 10.221.3.150	10.221.3.151
116	10.221.3.152/29	10.221.3.153 – 10.221.3.158	10.221.3.159
117	10.221.3.160/29	10.221.3.161 – 10.221.3.166	10.221.3.167
118	10.221.3.168/29	10.221.3.169 – 10.221.3.174	10.221.3.175
119	10.221.3.176/29	10.221.3.177 – 10.221.3.182	10.221.3.183
120	10.221.3.184/29	10.221.3.185 – 10.221.3.190	10.221.3.191
121	10.221.3.192/29	10.221.3.193 – 10.221.3.198	10.221.3.199
122	10.221.3.200/29	10.221.3.201 – 10.221.3.206	10.221.3.207
123	10.221.3.208/29	10.221.3.209 – 10.221.3.214	10.221.3.215
124	10.221.3.216/29	10.221.3.217 – 10.221.3.222	10.221.3.223
125	10.221.3.224/29	10.221.3.225 – 10.221.3.230	10.221.3.231
126	10.221.3.232/29	10.221.3.233 – 10.221.3.238	10.221.3.239
127	10.221.3.240/29	10.221.3.241 – 10.221.3.246	10.221.3.247
128	10.221.3.248/29	10.221.3.249 – 10.221.3.254	10.221.3.255
129	10.221.4.0/29	10.221.4.1 – 10.221.4.6	10.221.4.7
130	10.221.4.8/29	10.221.4.9 – 10.221.4.14	10.221.4.15
131	10.221.4.16/29	10.221.4.17 – 10.221.4.22	10.221.4.23
132	10.221.4.24/29	10.221.4.25 – 10.221.4.30	10.221.4.31
133	10.221.4.32/29	10.221.4.33 – 10.221.4.38	10.221.4.39
134	10.221.4.40/29	10.221.4.41 – 10.221.4.46	10.221.4.47
135	10.221.4.48/29	10.221.4.49 – 10.221.4.54	10.221.4.55
136	10.221.4.56/29	10.221.4.57 – 10.221.4.62	10.221.4.63
137	10.221.4.64/29	10.221.4.65 – 10.221.4.70	10.221.4.71
138	10.221.4.72/29	10.221.4.73 – 10.221.4.78	10.221.4.79
139	10.221.4.80/29	10.221.4.81 – 10.221.4.86	10.221.4.87
140	10.221.4.88/29	10.221.4.89 – 10.221.4.94	10.221.4.95
141	10.221.4.96/29	10.221.4.97 – 10.221.4.102	10.221.4.103
142	10.221.4.104/29	10.221.4.105 – 10.221.4.110	10.221.4.111
143	10.221.4.112/29	10.221.4.113 – 10.221.4.118	10.221.4.119
144	10.221.4.120/29	10.221.4.121 – 10.221.4.126	10.221.4.127
145	10.221.4.128/29	10.221.4.129 – 10.221.4.134	10.221.4.135
146	10.221.4.136/29	10.221.4.137 – 10.221.4.142	10.221.4.143
147	10.221.4.144/29	10.221.4.145 – 10.221.4.150	10.221.4.151
148	10.221.4.152/29	10.221.4.153 – 10.221.4.158	10.221.4.159
149	10.221.4.160/29	10.221.4.161 – 10.221.4.166	10.221.4.167
150	10.221.4.168/29	10.221.4.169 – 10.221.4.174	10.221.4.175
151	10.221.4.176/29	10.221.4.177 – 10.221.4.182	10.221.4.183
152	10.221.4.184/29	10.221.4.185 – 10.221.4.190	10.221.4.191
153	10.221.4.192/29	10.221.4.193 – 10.221.4.198	10.221.4.199
154	10.221.4.200/29	10.221.4.201 – 10.221.4.206	10.221.4.207
155	10.221.4.208/29	10.221.4.209 – 10.221.4.214	10.221.4.215
156	10.221.4.216/29	10.221.4.217 – 10.221.4.222	10.221.4.223
157	10.221.4.224/29	10.221.4.225 – 10.221.4.230	10.221.4.231
158	10.221.4.232/29	10.221.4.233 – 10.221.4.238	10.221.4.239
159	10.221.4.240/29	10.221.4.241 – 10.221.4.246	10.221.4.247
160	10.221.4.248/29	10.221.4.249 – 10.221.4.254	10.221.4.255
161	10.221.5.0/29	10.221.5.1 – 10.221.5.6	10.221.5.7
162	10.221.5.8/29	10.221.5.9 – 10.221.5.14	10.221.5.15
163	10.221.5.16/29	10.221.5.17 – 10.221.5.22	10.221.5.23
164	10.221.5.24/29	10.221.5.25 – 10.221.5.30	10.221.5.31
165	10.221.5.32/29	10.221.5.33 – 10.221.5.38	10.221.5.39
166	10.221.5.40/29	10.221.5.41 – 10.221.5.46	10.221.5.47
167	10.221.5.48/29	10.221.5.49 – 10.221.5.54	10.221.5.55
168	10.221.5.56/29	10.221.5.57 – 10.221.5.62	10.221.5.63
169	10.221.5.64/29	10.221.5.65 – 10.221.5.70	10.221.5.71
170	10.221.5.72/29	10.221.5.73 – 10.221.5.78	10.221.5.79
171	10.221.5.80/29	10.221.5.81 – 10.221.5.86	10.221.5.87
172	10.221.5.88/29	10.221.5.89 – 10.221.5.94	10.221.5.95
173	10.221.5.96/29	10.221.5.97 – 10.221.5.102	10.221.5.103
174	10.221.5.104/29	10.221.5.105 – 10.221.5.110	10.221.5.111
175	10.221.5.112/29	10.221.5.113 – 10.221.5.118	10.221.5.119
176	10.221.5.120/29	10.221.5.121 – 10.221.5.126	10.221.5.127
177	10.221.5.128/29	10.221.5.129 – 10.221.5.134	10.221.5.135
178	10.221.5.136/29	10.221.5.137 – 10.221.5.142	10.221.5.143
179	10.221.5.144/29	10.221.5.145 – 10.221.5.150	10.221.5.151
180	10.221.5.152/29	10.221.5.153 – 10.221.5.158	10.221.5.159
181	10.221.5.160/29	10.221.5.161 – 10.221.5.166	10.221.5.167
182	10.221.5.168/29	10.221.5.169 – 10.221.5.174	10.221.5.175
183	10.221.5.176/29	10.221.5.177 – 10.221.5.182	10.221.5.183
184	10.221.5.184/29	10.221.5.185 – 10.221.5.190	10.221.5.191
185	10.221.5.192/29	10.221.5.193 – 10.221.5.198	10.221.5.199
186	10.221.5.200/29	10.221.5.201 – 10.221.5.206	10.221.5.207
187	10.221.5.208/29	10.221.5.209 – 10.221.5.214	10.221.5.215
188	10.221.5.216/29	10.221.5.217 – 10.221.5.222	10.221.5.223
189	10.221.5.224/29	10.221.5.225 – 10.221.5.230	10.221.5.231
190	10.221.5.232/29	10.221.5.233 – 10.221.5.238	10.221.5.239
191	10.221.5.240/29	10.221.5.241 – 10.221.5.246	10.221.5.247
192	10.221.5.248/29	10.221.5.249 – 10.221.5.254	10.221.5.255
193	10.221.6.0/29	10.221.6.1 – 10.221.6.6	10.221.6.7
194	10.221.6.8/29	10.221.6.9 – 10.221.6.14	10.221.6.15
195	10.221.6.16/29	10.221.6.17 – 10.221.6.22	10.221.6.23
196	10.221.6.24/29	10.221.6.25 – 10.221.6.30	10.221.6.31
197	10.221.6.32/29	10.221.6.33 – 10.221.6.38	10.221.6.39
198	10.221.6.40/29	10.221.6.41 – 10.221.6.46	10.221.6.47
199	10.221.6.48/29	10.221.6.49 – 10.221.6.54	10.221.6.55
200	10.221.6.56/29	10.221.6.57 – 10.221.6.62	10.221.6.63
201	10.221.6.64/29	10.221.6.65 – 10.221.6.70	10.221.6.71
202	10.221.6.72/29	10.221.6.73 – 10.221.6.78	10.221.6.79
203	10.221.6.80/29	10.221.6.81 – 10.221.6.86	10.221.6.87
204	10.221.6.88/29	10.221.6.89 – 10.221.6.94	10.221.6.95
205	10.221.6.96/29	10.221.6.97 – 10.221.6.102	10.221.6.103
206	10.221.6.104/29	10.221.6.105 – 10.221.6.110	10.221.6.111
207	10.221.6.112/29	10.221.6.113 – 10.221.6.118	10.221.6.119
208	10.221.6.120/29	10.221.6.121 – 10.221.6.126	10.221.6.127
209	10.221.6.128/29	10.221.6.129 – 10.221.6.134	10.221.6.135
210	10.221.6.136/29	10.221.6.137 – 10.221.6.142	10.221.6.143
211	10.221.6.144/29	10.221.6.145 – 10.221.6.150	10.221.6.151
212	10.221.6.152/29	10.221.6.153 – 10.221.6.158	10.221.6.159
213	10.221.6.160/29	10.221.6.161 – 10.221.6.166	10.221.6.167
214	10.221.6.168/29	10.221.6.169 – 10.221.6.174	10.221.6.175
215	10.221.6.176/29	10.221.6.177 – 10.221.6.182	10.221.6.183
216	10.221.6.184/29	10.221.6.185 – 10.221.6.190	10.221.6.191
217	10.221.6.192/29	10.221.6.193 – 10.221.6.198	10.221.6.199
218	10.221.6.200/29	10.221.6.201 – 10.221.6.206	10.221.6.207
219	10.221.6.208/29	10.221.6.209 – 10.221.6.214	10.221.6.215
220	10.221.6.216/29	10.221.6.217 – 10.221.6.222	10.221.6.223
221	10.221.6.224/29	10.221.6.225 – 10.221.6.230	10.221.6.231
222	10.221.6.232/29	10.221.6.233 – 10.221.6.238	10.221.6.239
223	10.221.6.240/29	10.221.6.241 – 10.221.6.246	10.221.6.247
224	10.221.6.248/29	10.221.6.249 – 10.221.6.254	10.221.6.255
225	10.221.7.0/29	10.221.7.1 – 10.221.7.6	10.221.7.7
226	10.221.7.8/29	10.221.7.9 – 10.221.7.14	10.221.7.15
227	10.221.7.16/29	10.221.7.17 – 10.221.7.22	10.221.7.23
228	10.221.7.24/29	10.221.7.25 – 10.221.7.30	10.221.7.31
229	10.221.7.32/29	10.221.7.33 – 10.221.7.38	10.221.7.39
230	10.221.7.40/29	10.221.7.41 – 10.221.7.46	10.221.7.47
231	10.221.7.48/29	10.221.7.49 – 10.221.7.54	10.221.7.55
232	10.221.7.56/29	10.221.7.57 – 10.221.7.62	10.221.7.63
233	10.221.7.64/29	10.221.7.65 – 10.221.7.70	10.221.7.71
234	10.221.7.72/29	10.221.7.73 – 10.221.7.78	10.221.7.79
235	10.221.7.80/29	10.221.7.81 – 10.221.7.86	10.221.7.87
236	10.221.7.88/29	10.221.7.89 – 10.221.7.94	10.221.7.95
237	10.221.7.96/29	10.221.7.97 – 10.221.7.102	10.221.7.103
238	10.221.7.104/29	10.221.7.105 – 10.221.7.110	10.221.7.111
239	10.221.7.112/29	10.221.7.113 – 10.221.7.118	10.221.7.119
240	10.221.7.120/29	10.221.7.121 – 10.221.7.126	10.221.7.127
241	10.221.7.128/29	10.221.7.129 – 10.221.7.134	10.221.7.135
242	10.221.7.136/29	10.221.7.137 – 10.221.7.142	10.221.7.143
243	10.221.7.144/29	10.221.7.145 – 10.221.7.150	10.221.7.151
244	10.221.7.152/29	10.221.7.153 – 10.221.7.158	10.221.7.159
245	10.221.7.160/29	10.221.7.161 – 10.221.7.166	10.221.7.167
246	10.221.7.168/29	10.221.7.169 – 10.221.7.174	10.221.7.175
247	10.221.7.176/29	10.221.7.177 – 10.221.7.182	10.221.7.183
248	10.221.7.184/29	10.221.7.185 – 10.221.7.190	10.221.7.191
249	10.221.7.192/29	10.221.7.193 – 10.221.7.198	10.221.7.199
250	10.221.7.200/29	10.221.7.201 – 10.221.7.206	10.221.7.207
251	10.221.7.208/29	10.221.7.209 – 10.221.7.214	10.221.7.215
252	10.221.7.216/29	10.221.7.217 – 10.221.7.222	10.221.7.223
253	10.221.7.224/29	10.221.7.225 – 10.221.7.230	10.221.7.231
254	10.221.7.232/29	10.221.7.233 – 10.221.7.238	10.221.7.239
255	10.221.7.240/29	10.221.7.241 – 10.221.7.246	10.221.7.247
256	10.221.7.248/29	10.221.7.249 – 10.221.7.254	10.221.7.255

showing 256 of 8,192

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 →