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)10.3.232.0/21

network10.3.232.0/21

broadcast10.3.239.255

first host10.3.232.1

last host10.3.239.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.232.0/21

address00001010.00000011.11101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.11101000.00000000

broadcast00001010.00000011.11101111.11111111

green = network part, grey = host part

hex0x0a03e800

decimal168028160

reverse dns0.232.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.232.0/29	10.3.232.1 – 10.3.232.6	10.3.232.7
2	10.3.232.8/29	10.3.232.9 – 10.3.232.14	10.3.232.15
3	10.3.232.16/29	10.3.232.17 – 10.3.232.22	10.3.232.23
4	10.3.232.24/29	10.3.232.25 – 10.3.232.30	10.3.232.31
5	10.3.232.32/29	10.3.232.33 – 10.3.232.38	10.3.232.39
6	10.3.232.40/29	10.3.232.41 – 10.3.232.46	10.3.232.47
7	10.3.232.48/29	10.3.232.49 – 10.3.232.54	10.3.232.55
8	10.3.232.56/29	10.3.232.57 – 10.3.232.62	10.3.232.63
9	10.3.232.64/29	10.3.232.65 – 10.3.232.70	10.3.232.71
10	10.3.232.72/29	10.3.232.73 – 10.3.232.78	10.3.232.79
11	10.3.232.80/29	10.3.232.81 – 10.3.232.86	10.3.232.87
12	10.3.232.88/29	10.3.232.89 – 10.3.232.94	10.3.232.95
13	10.3.232.96/29	10.3.232.97 – 10.3.232.102	10.3.232.103
14	10.3.232.104/29	10.3.232.105 – 10.3.232.110	10.3.232.111
15	10.3.232.112/29	10.3.232.113 – 10.3.232.118	10.3.232.119
16	10.3.232.120/29	10.3.232.121 – 10.3.232.126	10.3.232.127
17	10.3.232.128/29	10.3.232.129 – 10.3.232.134	10.3.232.135
18	10.3.232.136/29	10.3.232.137 – 10.3.232.142	10.3.232.143
19	10.3.232.144/29	10.3.232.145 – 10.3.232.150	10.3.232.151
20	10.3.232.152/29	10.3.232.153 – 10.3.232.158	10.3.232.159
21	10.3.232.160/29	10.3.232.161 – 10.3.232.166	10.3.232.167
22	10.3.232.168/29	10.3.232.169 – 10.3.232.174	10.3.232.175
23	10.3.232.176/29	10.3.232.177 – 10.3.232.182	10.3.232.183
24	10.3.232.184/29	10.3.232.185 – 10.3.232.190	10.3.232.191
25	10.3.232.192/29	10.3.232.193 – 10.3.232.198	10.3.232.199
26	10.3.232.200/29	10.3.232.201 – 10.3.232.206	10.3.232.207
27	10.3.232.208/29	10.3.232.209 – 10.3.232.214	10.3.232.215
28	10.3.232.216/29	10.3.232.217 – 10.3.232.222	10.3.232.223
29	10.3.232.224/29	10.3.232.225 – 10.3.232.230	10.3.232.231
30	10.3.232.232/29	10.3.232.233 – 10.3.232.238	10.3.232.239
31	10.3.232.240/29	10.3.232.241 – 10.3.232.246	10.3.232.247
32	10.3.232.248/29	10.3.232.249 – 10.3.232.254	10.3.232.255
33	10.3.233.0/29	10.3.233.1 – 10.3.233.6	10.3.233.7
34	10.3.233.8/29	10.3.233.9 – 10.3.233.14	10.3.233.15
35	10.3.233.16/29	10.3.233.17 – 10.3.233.22	10.3.233.23
36	10.3.233.24/29	10.3.233.25 – 10.3.233.30	10.3.233.31
37	10.3.233.32/29	10.3.233.33 – 10.3.233.38	10.3.233.39
38	10.3.233.40/29	10.3.233.41 – 10.3.233.46	10.3.233.47
39	10.3.233.48/29	10.3.233.49 – 10.3.233.54	10.3.233.55
40	10.3.233.56/29	10.3.233.57 – 10.3.233.62	10.3.233.63
41	10.3.233.64/29	10.3.233.65 – 10.3.233.70	10.3.233.71
42	10.3.233.72/29	10.3.233.73 – 10.3.233.78	10.3.233.79
43	10.3.233.80/29	10.3.233.81 – 10.3.233.86	10.3.233.87
44	10.3.233.88/29	10.3.233.89 – 10.3.233.94	10.3.233.95
45	10.3.233.96/29	10.3.233.97 – 10.3.233.102	10.3.233.103
46	10.3.233.104/29	10.3.233.105 – 10.3.233.110	10.3.233.111
47	10.3.233.112/29	10.3.233.113 – 10.3.233.118	10.3.233.119
48	10.3.233.120/29	10.3.233.121 – 10.3.233.126	10.3.233.127
49	10.3.233.128/29	10.3.233.129 – 10.3.233.134	10.3.233.135
50	10.3.233.136/29	10.3.233.137 – 10.3.233.142	10.3.233.143
51	10.3.233.144/29	10.3.233.145 – 10.3.233.150	10.3.233.151
52	10.3.233.152/29	10.3.233.153 – 10.3.233.158	10.3.233.159
53	10.3.233.160/29	10.3.233.161 – 10.3.233.166	10.3.233.167
54	10.3.233.168/29	10.3.233.169 – 10.3.233.174	10.3.233.175
55	10.3.233.176/29	10.3.233.177 – 10.3.233.182	10.3.233.183
56	10.3.233.184/29	10.3.233.185 – 10.3.233.190	10.3.233.191
57	10.3.233.192/29	10.3.233.193 – 10.3.233.198	10.3.233.199
58	10.3.233.200/29	10.3.233.201 – 10.3.233.206	10.3.233.207
59	10.3.233.208/29	10.3.233.209 – 10.3.233.214	10.3.233.215
60	10.3.233.216/29	10.3.233.217 – 10.3.233.222	10.3.233.223
61	10.3.233.224/29	10.3.233.225 – 10.3.233.230	10.3.233.231
62	10.3.233.232/29	10.3.233.233 – 10.3.233.238	10.3.233.239
63	10.3.233.240/29	10.3.233.241 – 10.3.233.246	10.3.233.247
64	10.3.233.248/29	10.3.233.249 – 10.3.233.254	10.3.233.255
65	10.3.234.0/29	10.3.234.1 – 10.3.234.6	10.3.234.7
66	10.3.234.8/29	10.3.234.9 – 10.3.234.14	10.3.234.15
67	10.3.234.16/29	10.3.234.17 – 10.3.234.22	10.3.234.23
68	10.3.234.24/29	10.3.234.25 – 10.3.234.30	10.3.234.31
69	10.3.234.32/29	10.3.234.33 – 10.3.234.38	10.3.234.39
70	10.3.234.40/29	10.3.234.41 – 10.3.234.46	10.3.234.47
71	10.3.234.48/29	10.3.234.49 – 10.3.234.54	10.3.234.55
72	10.3.234.56/29	10.3.234.57 – 10.3.234.62	10.3.234.63
73	10.3.234.64/29	10.3.234.65 – 10.3.234.70	10.3.234.71
74	10.3.234.72/29	10.3.234.73 – 10.3.234.78	10.3.234.79
75	10.3.234.80/29	10.3.234.81 – 10.3.234.86	10.3.234.87
76	10.3.234.88/29	10.3.234.89 – 10.3.234.94	10.3.234.95
77	10.3.234.96/29	10.3.234.97 – 10.3.234.102	10.3.234.103
78	10.3.234.104/29	10.3.234.105 – 10.3.234.110	10.3.234.111
79	10.3.234.112/29	10.3.234.113 – 10.3.234.118	10.3.234.119
80	10.3.234.120/29	10.3.234.121 – 10.3.234.126	10.3.234.127
81	10.3.234.128/29	10.3.234.129 – 10.3.234.134	10.3.234.135
82	10.3.234.136/29	10.3.234.137 – 10.3.234.142	10.3.234.143
83	10.3.234.144/29	10.3.234.145 – 10.3.234.150	10.3.234.151
84	10.3.234.152/29	10.3.234.153 – 10.3.234.158	10.3.234.159
85	10.3.234.160/29	10.3.234.161 – 10.3.234.166	10.3.234.167
86	10.3.234.168/29	10.3.234.169 – 10.3.234.174	10.3.234.175
87	10.3.234.176/29	10.3.234.177 – 10.3.234.182	10.3.234.183
88	10.3.234.184/29	10.3.234.185 – 10.3.234.190	10.3.234.191
89	10.3.234.192/29	10.3.234.193 – 10.3.234.198	10.3.234.199
90	10.3.234.200/29	10.3.234.201 – 10.3.234.206	10.3.234.207
91	10.3.234.208/29	10.3.234.209 – 10.3.234.214	10.3.234.215
92	10.3.234.216/29	10.3.234.217 – 10.3.234.222	10.3.234.223
93	10.3.234.224/29	10.3.234.225 – 10.3.234.230	10.3.234.231
94	10.3.234.232/29	10.3.234.233 – 10.3.234.238	10.3.234.239
95	10.3.234.240/29	10.3.234.241 – 10.3.234.246	10.3.234.247
96	10.3.234.248/29	10.3.234.249 – 10.3.234.254	10.3.234.255
97	10.3.235.0/29	10.3.235.1 – 10.3.235.6	10.3.235.7
98	10.3.235.8/29	10.3.235.9 – 10.3.235.14	10.3.235.15
99	10.3.235.16/29	10.3.235.17 – 10.3.235.22	10.3.235.23
100	10.3.235.24/29	10.3.235.25 – 10.3.235.30	10.3.235.31
101	10.3.235.32/29	10.3.235.33 – 10.3.235.38	10.3.235.39
102	10.3.235.40/29	10.3.235.41 – 10.3.235.46	10.3.235.47
103	10.3.235.48/29	10.3.235.49 – 10.3.235.54	10.3.235.55
104	10.3.235.56/29	10.3.235.57 – 10.3.235.62	10.3.235.63
105	10.3.235.64/29	10.3.235.65 – 10.3.235.70	10.3.235.71
106	10.3.235.72/29	10.3.235.73 – 10.3.235.78	10.3.235.79
107	10.3.235.80/29	10.3.235.81 – 10.3.235.86	10.3.235.87
108	10.3.235.88/29	10.3.235.89 – 10.3.235.94	10.3.235.95
109	10.3.235.96/29	10.3.235.97 – 10.3.235.102	10.3.235.103
110	10.3.235.104/29	10.3.235.105 – 10.3.235.110	10.3.235.111
111	10.3.235.112/29	10.3.235.113 – 10.3.235.118	10.3.235.119
112	10.3.235.120/29	10.3.235.121 – 10.3.235.126	10.3.235.127
113	10.3.235.128/29	10.3.235.129 – 10.3.235.134	10.3.235.135
114	10.3.235.136/29	10.3.235.137 – 10.3.235.142	10.3.235.143
115	10.3.235.144/29	10.3.235.145 – 10.3.235.150	10.3.235.151
116	10.3.235.152/29	10.3.235.153 – 10.3.235.158	10.3.235.159
117	10.3.235.160/29	10.3.235.161 – 10.3.235.166	10.3.235.167
118	10.3.235.168/29	10.3.235.169 – 10.3.235.174	10.3.235.175
119	10.3.235.176/29	10.3.235.177 – 10.3.235.182	10.3.235.183
120	10.3.235.184/29	10.3.235.185 – 10.3.235.190	10.3.235.191
121	10.3.235.192/29	10.3.235.193 – 10.3.235.198	10.3.235.199
122	10.3.235.200/29	10.3.235.201 – 10.3.235.206	10.3.235.207
123	10.3.235.208/29	10.3.235.209 – 10.3.235.214	10.3.235.215
124	10.3.235.216/29	10.3.235.217 – 10.3.235.222	10.3.235.223
125	10.3.235.224/29	10.3.235.225 – 10.3.235.230	10.3.235.231
126	10.3.235.232/29	10.3.235.233 – 10.3.235.238	10.3.235.239
127	10.3.235.240/29	10.3.235.241 – 10.3.235.246	10.3.235.247
128	10.3.235.248/29	10.3.235.249 – 10.3.235.254	10.3.235.255
129	10.3.236.0/29	10.3.236.1 – 10.3.236.6	10.3.236.7
130	10.3.236.8/29	10.3.236.9 – 10.3.236.14	10.3.236.15
131	10.3.236.16/29	10.3.236.17 – 10.3.236.22	10.3.236.23
132	10.3.236.24/29	10.3.236.25 – 10.3.236.30	10.3.236.31
133	10.3.236.32/29	10.3.236.33 – 10.3.236.38	10.3.236.39
134	10.3.236.40/29	10.3.236.41 – 10.3.236.46	10.3.236.47
135	10.3.236.48/29	10.3.236.49 – 10.3.236.54	10.3.236.55
136	10.3.236.56/29	10.3.236.57 – 10.3.236.62	10.3.236.63
137	10.3.236.64/29	10.3.236.65 – 10.3.236.70	10.3.236.71
138	10.3.236.72/29	10.3.236.73 – 10.3.236.78	10.3.236.79
139	10.3.236.80/29	10.3.236.81 – 10.3.236.86	10.3.236.87
140	10.3.236.88/29	10.3.236.89 – 10.3.236.94	10.3.236.95
141	10.3.236.96/29	10.3.236.97 – 10.3.236.102	10.3.236.103
142	10.3.236.104/29	10.3.236.105 – 10.3.236.110	10.3.236.111
143	10.3.236.112/29	10.3.236.113 – 10.3.236.118	10.3.236.119
144	10.3.236.120/29	10.3.236.121 – 10.3.236.126	10.3.236.127
145	10.3.236.128/29	10.3.236.129 – 10.3.236.134	10.3.236.135
146	10.3.236.136/29	10.3.236.137 – 10.3.236.142	10.3.236.143
147	10.3.236.144/29	10.3.236.145 – 10.3.236.150	10.3.236.151
148	10.3.236.152/29	10.3.236.153 – 10.3.236.158	10.3.236.159
149	10.3.236.160/29	10.3.236.161 – 10.3.236.166	10.3.236.167
150	10.3.236.168/29	10.3.236.169 – 10.3.236.174	10.3.236.175
151	10.3.236.176/29	10.3.236.177 – 10.3.236.182	10.3.236.183
152	10.3.236.184/29	10.3.236.185 – 10.3.236.190	10.3.236.191
153	10.3.236.192/29	10.3.236.193 – 10.3.236.198	10.3.236.199
154	10.3.236.200/29	10.3.236.201 – 10.3.236.206	10.3.236.207
155	10.3.236.208/29	10.3.236.209 – 10.3.236.214	10.3.236.215
156	10.3.236.216/29	10.3.236.217 – 10.3.236.222	10.3.236.223
157	10.3.236.224/29	10.3.236.225 – 10.3.236.230	10.3.236.231
158	10.3.236.232/29	10.3.236.233 – 10.3.236.238	10.3.236.239
159	10.3.236.240/29	10.3.236.241 – 10.3.236.246	10.3.236.247
160	10.3.236.248/29	10.3.236.249 – 10.3.236.254	10.3.236.255
161	10.3.237.0/29	10.3.237.1 – 10.3.237.6	10.3.237.7
162	10.3.237.8/29	10.3.237.9 – 10.3.237.14	10.3.237.15
163	10.3.237.16/29	10.3.237.17 – 10.3.237.22	10.3.237.23
164	10.3.237.24/29	10.3.237.25 – 10.3.237.30	10.3.237.31
165	10.3.237.32/29	10.3.237.33 – 10.3.237.38	10.3.237.39
166	10.3.237.40/29	10.3.237.41 – 10.3.237.46	10.3.237.47
167	10.3.237.48/29	10.3.237.49 – 10.3.237.54	10.3.237.55
168	10.3.237.56/29	10.3.237.57 – 10.3.237.62	10.3.237.63
169	10.3.237.64/29	10.3.237.65 – 10.3.237.70	10.3.237.71
170	10.3.237.72/29	10.3.237.73 – 10.3.237.78	10.3.237.79
171	10.3.237.80/29	10.3.237.81 – 10.3.237.86	10.3.237.87
172	10.3.237.88/29	10.3.237.89 – 10.3.237.94	10.3.237.95
173	10.3.237.96/29	10.3.237.97 – 10.3.237.102	10.3.237.103
174	10.3.237.104/29	10.3.237.105 – 10.3.237.110	10.3.237.111
175	10.3.237.112/29	10.3.237.113 – 10.3.237.118	10.3.237.119
176	10.3.237.120/29	10.3.237.121 – 10.3.237.126	10.3.237.127
177	10.3.237.128/29	10.3.237.129 – 10.3.237.134	10.3.237.135
178	10.3.237.136/29	10.3.237.137 – 10.3.237.142	10.3.237.143
179	10.3.237.144/29	10.3.237.145 – 10.3.237.150	10.3.237.151
180	10.3.237.152/29	10.3.237.153 – 10.3.237.158	10.3.237.159
181	10.3.237.160/29	10.3.237.161 – 10.3.237.166	10.3.237.167
182	10.3.237.168/29	10.3.237.169 – 10.3.237.174	10.3.237.175
183	10.3.237.176/29	10.3.237.177 – 10.3.237.182	10.3.237.183
184	10.3.237.184/29	10.3.237.185 – 10.3.237.190	10.3.237.191
185	10.3.237.192/29	10.3.237.193 – 10.3.237.198	10.3.237.199
186	10.3.237.200/29	10.3.237.201 – 10.3.237.206	10.3.237.207
187	10.3.237.208/29	10.3.237.209 – 10.3.237.214	10.3.237.215
188	10.3.237.216/29	10.3.237.217 – 10.3.237.222	10.3.237.223
189	10.3.237.224/29	10.3.237.225 – 10.3.237.230	10.3.237.231
190	10.3.237.232/29	10.3.237.233 – 10.3.237.238	10.3.237.239
191	10.3.237.240/29	10.3.237.241 – 10.3.237.246	10.3.237.247
192	10.3.237.248/29	10.3.237.249 – 10.3.237.254	10.3.237.255
193	10.3.238.0/29	10.3.238.1 – 10.3.238.6	10.3.238.7
194	10.3.238.8/29	10.3.238.9 – 10.3.238.14	10.3.238.15
195	10.3.238.16/29	10.3.238.17 – 10.3.238.22	10.3.238.23
196	10.3.238.24/29	10.3.238.25 – 10.3.238.30	10.3.238.31
197	10.3.238.32/29	10.3.238.33 – 10.3.238.38	10.3.238.39
198	10.3.238.40/29	10.3.238.41 – 10.3.238.46	10.3.238.47
199	10.3.238.48/29	10.3.238.49 – 10.3.238.54	10.3.238.55
200	10.3.238.56/29	10.3.238.57 – 10.3.238.62	10.3.238.63
201	10.3.238.64/29	10.3.238.65 – 10.3.238.70	10.3.238.71
202	10.3.238.72/29	10.3.238.73 – 10.3.238.78	10.3.238.79
203	10.3.238.80/29	10.3.238.81 – 10.3.238.86	10.3.238.87
204	10.3.238.88/29	10.3.238.89 – 10.3.238.94	10.3.238.95
205	10.3.238.96/29	10.3.238.97 – 10.3.238.102	10.3.238.103
206	10.3.238.104/29	10.3.238.105 – 10.3.238.110	10.3.238.111
207	10.3.238.112/29	10.3.238.113 – 10.3.238.118	10.3.238.119
208	10.3.238.120/29	10.3.238.121 – 10.3.238.126	10.3.238.127
209	10.3.238.128/29	10.3.238.129 – 10.3.238.134	10.3.238.135
210	10.3.238.136/29	10.3.238.137 – 10.3.238.142	10.3.238.143
211	10.3.238.144/29	10.3.238.145 – 10.3.238.150	10.3.238.151
212	10.3.238.152/29	10.3.238.153 – 10.3.238.158	10.3.238.159
213	10.3.238.160/29	10.3.238.161 – 10.3.238.166	10.3.238.167
214	10.3.238.168/29	10.3.238.169 – 10.3.238.174	10.3.238.175
215	10.3.238.176/29	10.3.238.177 – 10.3.238.182	10.3.238.183
216	10.3.238.184/29	10.3.238.185 – 10.3.238.190	10.3.238.191
217	10.3.238.192/29	10.3.238.193 – 10.3.238.198	10.3.238.199
218	10.3.238.200/29	10.3.238.201 – 10.3.238.206	10.3.238.207
219	10.3.238.208/29	10.3.238.209 – 10.3.238.214	10.3.238.215
220	10.3.238.216/29	10.3.238.217 – 10.3.238.222	10.3.238.223
221	10.3.238.224/29	10.3.238.225 – 10.3.238.230	10.3.238.231
222	10.3.238.232/29	10.3.238.233 – 10.3.238.238	10.3.238.239
223	10.3.238.240/29	10.3.238.241 – 10.3.238.246	10.3.238.247
224	10.3.238.248/29	10.3.238.249 – 10.3.238.254	10.3.238.255
225	10.3.239.0/29	10.3.239.1 – 10.3.239.6	10.3.239.7
226	10.3.239.8/29	10.3.239.9 – 10.3.239.14	10.3.239.15
227	10.3.239.16/29	10.3.239.17 – 10.3.239.22	10.3.239.23
228	10.3.239.24/29	10.3.239.25 – 10.3.239.30	10.3.239.31
229	10.3.239.32/29	10.3.239.33 – 10.3.239.38	10.3.239.39
230	10.3.239.40/29	10.3.239.41 – 10.3.239.46	10.3.239.47
231	10.3.239.48/29	10.3.239.49 – 10.3.239.54	10.3.239.55
232	10.3.239.56/29	10.3.239.57 – 10.3.239.62	10.3.239.63
233	10.3.239.64/29	10.3.239.65 – 10.3.239.70	10.3.239.71
234	10.3.239.72/29	10.3.239.73 – 10.3.239.78	10.3.239.79
235	10.3.239.80/29	10.3.239.81 – 10.3.239.86	10.3.239.87
236	10.3.239.88/29	10.3.239.89 – 10.3.239.94	10.3.239.95
237	10.3.239.96/29	10.3.239.97 – 10.3.239.102	10.3.239.103
238	10.3.239.104/29	10.3.239.105 – 10.3.239.110	10.3.239.111
239	10.3.239.112/29	10.3.239.113 – 10.3.239.118	10.3.239.119
240	10.3.239.120/29	10.3.239.121 – 10.3.239.126	10.3.239.127
241	10.3.239.128/29	10.3.239.129 – 10.3.239.134	10.3.239.135
242	10.3.239.136/29	10.3.239.137 – 10.3.239.142	10.3.239.143
243	10.3.239.144/29	10.3.239.145 – 10.3.239.150	10.3.239.151
244	10.3.239.152/29	10.3.239.153 – 10.3.239.158	10.3.239.159
245	10.3.239.160/29	10.3.239.161 – 10.3.239.166	10.3.239.167
246	10.3.239.168/29	10.3.239.169 – 10.3.239.174	10.3.239.175
247	10.3.239.176/29	10.3.239.177 – 10.3.239.182	10.3.239.183
248	10.3.239.184/29	10.3.239.185 – 10.3.239.190	10.3.239.191
249	10.3.239.192/29	10.3.239.193 – 10.3.239.198	10.3.239.199
250	10.3.239.200/29	10.3.239.201 – 10.3.239.206	10.3.239.207
251	10.3.239.208/29	10.3.239.209 – 10.3.239.214	10.3.239.215
252	10.3.239.216/29	10.3.239.217 – 10.3.239.222	10.3.239.223
253	10.3.239.224/29	10.3.239.225 – 10.3.239.230	10.3.239.231
254	10.3.239.232/29	10.3.239.233 – 10.3.239.238	10.3.239.239
255	10.3.239.240/29	10.3.239.241 – 10.3.239.246	10.3.239.247
256	10.3.239.248/29	10.3.239.249 – 10.3.239.254	10.3.239.255

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 /21
/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	-
/21	255.255.248.0	2,048	2,046	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →