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)10.3.184.0/21

network10.3.184.0/21

broadcast10.3.191.255

first host10.3.184.1

last host10.3.191.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.184.0/21

address00001010.00000011.10111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.10111000.00000000

broadcast00001010.00000011.10111111.11111111

green = network part, grey = host part

hex0x0a03b800

decimal168015872

reverse dns0.184.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:b800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.184.0/29	10.3.184.1 – 10.3.184.6	10.3.184.7
2	10.3.184.8/29	10.3.184.9 – 10.3.184.14	10.3.184.15
3	10.3.184.16/29	10.3.184.17 – 10.3.184.22	10.3.184.23
4	10.3.184.24/29	10.3.184.25 – 10.3.184.30	10.3.184.31
5	10.3.184.32/29	10.3.184.33 – 10.3.184.38	10.3.184.39
6	10.3.184.40/29	10.3.184.41 – 10.3.184.46	10.3.184.47
7	10.3.184.48/29	10.3.184.49 – 10.3.184.54	10.3.184.55
8	10.3.184.56/29	10.3.184.57 – 10.3.184.62	10.3.184.63
9	10.3.184.64/29	10.3.184.65 – 10.3.184.70	10.3.184.71
10	10.3.184.72/29	10.3.184.73 – 10.3.184.78	10.3.184.79
11	10.3.184.80/29	10.3.184.81 – 10.3.184.86	10.3.184.87
12	10.3.184.88/29	10.3.184.89 – 10.3.184.94	10.3.184.95
13	10.3.184.96/29	10.3.184.97 – 10.3.184.102	10.3.184.103
14	10.3.184.104/29	10.3.184.105 – 10.3.184.110	10.3.184.111
15	10.3.184.112/29	10.3.184.113 – 10.3.184.118	10.3.184.119
16	10.3.184.120/29	10.3.184.121 – 10.3.184.126	10.3.184.127
17	10.3.184.128/29	10.3.184.129 – 10.3.184.134	10.3.184.135
18	10.3.184.136/29	10.3.184.137 – 10.3.184.142	10.3.184.143
19	10.3.184.144/29	10.3.184.145 – 10.3.184.150	10.3.184.151
20	10.3.184.152/29	10.3.184.153 – 10.3.184.158	10.3.184.159
21	10.3.184.160/29	10.3.184.161 – 10.3.184.166	10.3.184.167
22	10.3.184.168/29	10.3.184.169 – 10.3.184.174	10.3.184.175
23	10.3.184.176/29	10.3.184.177 – 10.3.184.182	10.3.184.183
24	10.3.184.184/29	10.3.184.185 – 10.3.184.190	10.3.184.191
25	10.3.184.192/29	10.3.184.193 – 10.3.184.198	10.3.184.199
26	10.3.184.200/29	10.3.184.201 – 10.3.184.206	10.3.184.207
27	10.3.184.208/29	10.3.184.209 – 10.3.184.214	10.3.184.215
28	10.3.184.216/29	10.3.184.217 – 10.3.184.222	10.3.184.223
29	10.3.184.224/29	10.3.184.225 – 10.3.184.230	10.3.184.231
30	10.3.184.232/29	10.3.184.233 – 10.3.184.238	10.3.184.239
31	10.3.184.240/29	10.3.184.241 – 10.3.184.246	10.3.184.247
32	10.3.184.248/29	10.3.184.249 – 10.3.184.254	10.3.184.255
33	10.3.185.0/29	10.3.185.1 – 10.3.185.6	10.3.185.7
34	10.3.185.8/29	10.3.185.9 – 10.3.185.14	10.3.185.15
35	10.3.185.16/29	10.3.185.17 – 10.3.185.22	10.3.185.23
36	10.3.185.24/29	10.3.185.25 – 10.3.185.30	10.3.185.31
37	10.3.185.32/29	10.3.185.33 – 10.3.185.38	10.3.185.39
38	10.3.185.40/29	10.3.185.41 – 10.3.185.46	10.3.185.47
39	10.3.185.48/29	10.3.185.49 – 10.3.185.54	10.3.185.55
40	10.3.185.56/29	10.3.185.57 – 10.3.185.62	10.3.185.63
41	10.3.185.64/29	10.3.185.65 – 10.3.185.70	10.3.185.71
42	10.3.185.72/29	10.3.185.73 – 10.3.185.78	10.3.185.79
43	10.3.185.80/29	10.3.185.81 – 10.3.185.86	10.3.185.87
44	10.3.185.88/29	10.3.185.89 – 10.3.185.94	10.3.185.95
45	10.3.185.96/29	10.3.185.97 – 10.3.185.102	10.3.185.103
46	10.3.185.104/29	10.3.185.105 – 10.3.185.110	10.3.185.111
47	10.3.185.112/29	10.3.185.113 – 10.3.185.118	10.3.185.119
48	10.3.185.120/29	10.3.185.121 – 10.3.185.126	10.3.185.127
49	10.3.185.128/29	10.3.185.129 – 10.3.185.134	10.3.185.135
50	10.3.185.136/29	10.3.185.137 – 10.3.185.142	10.3.185.143
51	10.3.185.144/29	10.3.185.145 – 10.3.185.150	10.3.185.151
52	10.3.185.152/29	10.3.185.153 – 10.3.185.158	10.3.185.159
53	10.3.185.160/29	10.3.185.161 – 10.3.185.166	10.3.185.167
54	10.3.185.168/29	10.3.185.169 – 10.3.185.174	10.3.185.175
55	10.3.185.176/29	10.3.185.177 – 10.3.185.182	10.3.185.183
56	10.3.185.184/29	10.3.185.185 – 10.3.185.190	10.3.185.191
57	10.3.185.192/29	10.3.185.193 – 10.3.185.198	10.3.185.199
58	10.3.185.200/29	10.3.185.201 – 10.3.185.206	10.3.185.207
59	10.3.185.208/29	10.3.185.209 – 10.3.185.214	10.3.185.215
60	10.3.185.216/29	10.3.185.217 – 10.3.185.222	10.3.185.223
61	10.3.185.224/29	10.3.185.225 – 10.3.185.230	10.3.185.231
62	10.3.185.232/29	10.3.185.233 – 10.3.185.238	10.3.185.239
63	10.3.185.240/29	10.3.185.241 – 10.3.185.246	10.3.185.247
64	10.3.185.248/29	10.3.185.249 – 10.3.185.254	10.3.185.255
65	10.3.186.0/29	10.3.186.1 – 10.3.186.6	10.3.186.7
66	10.3.186.8/29	10.3.186.9 – 10.3.186.14	10.3.186.15
67	10.3.186.16/29	10.3.186.17 – 10.3.186.22	10.3.186.23
68	10.3.186.24/29	10.3.186.25 – 10.3.186.30	10.3.186.31
69	10.3.186.32/29	10.3.186.33 – 10.3.186.38	10.3.186.39
70	10.3.186.40/29	10.3.186.41 – 10.3.186.46	10.3.186.47
71	10.3.186.48/29	10.3.186.49 – 10.3.186.54	10.3.186.55
72	10.3.186.56/29	10.3.186.57 – 10.3.186.62	10.3.186.63
73	10.3.186.64/29	10.3.186.65 – 10.3.186.70	10.3.186.71
74	10.3.186.72/29	10.3.186.73 – 10.3.186.78	10.3.186.79
75	10.3.186.80/29	10.3.186.81 – 10.3.186.86	10.3.186.87
76	10.3.186.88/29	10.3.186.89 – 10.3.186.94	10.3.186.95
77	10.3.186.96/29	10.3.186.97 – 10.3.186.102	10.3.186.103
78	10.3.186.104/29	10.3.186.105 – 10.3.186.110	10.3.186.111
79	10.3.186.112/29	10.3.186.113 – 10.3.186.118	10.3.186.119
80	10.3.186.120/29	10.3.186.121 – 10.3.186.126	10.3.186.127
81	10.3.186.128/29	10.3.186.129 – 10.3.186.134	10.3.186.135
82	10.3.186.136/29	10.3.186.137 – 10.3.186.142	10.3.186.143
83	10.3.186.144/29	10.3.186.145 – 10.3.186.150	10.3.186.151
84	10.3.186.152/29	10.3.186.153 – 10.3.186.158	10.3.186.159
85	10.3.186.160/29	10.3.186.161 – 10.3.186.166	10.3.186.167
86	10.3.186.168/29	10.3.186.169 – 10.3.186.174	10.3.186.175
87	10.3.186.176/29	10.3.186.177 – 10.3.186.182	10.3.186.183
88	10.3.186.184/29	10.3.186.185 – 10.3.186.190	10.3.186.191
89	10.3.186.192/29	10.3.186.193 – 10.3.186.198	10.3.186.199
90	10.3.186.200/29	10.3.186.201 – 10.3.186.206	10.3.186.207
91	10.3.186.208/29	10.3.186.209 – 10.3.186.214	10.3.186.215
92	10.3.186.216/29	10.3.186.217 – 10.3.186.222	10.3.186.223
93	10.3.186.224/29	10.3.186.225 – 10.3.186.230	10.3.186.231
94	10.3.186.232/29	10.3.186.233 – 10.3.186.238	10.3.186.239
95	10.3.186.240/29	10.3.186.241 – 10.3.186.246	10.3.186.247
96	10.3.186.248/29	10.3.186.249 – 10.3.186.254	10.3.186.255
97	10.3.187.0/29	10.3.187.1 – 10.3.187.6	10.3.187.7
98	10.3.187.8/29	10.3.187.9 – 10.3.187.14	10.3.187.15
99	10.3.187.16/29	10.3.187.17 – 10.3.187.22	10.3.187.23
100	10.3.187.24/29	10.3.187.25 – 10.3.187.30	10.3.187.31
101	10.3.187.32/29	10.3.187.33 – 10.3.187.38	10.3.187.39
102	10.3.187.40/29	10.3.187.41 – 10.3.187.46	10.3.187.47
103	10.3.187.48/29	10.3.187.49 – 10.3.187.54	10.3.187.55
104	10.3.187.56/29	10.3.187.57 – 10.3.187.62	10.3.187.63
105	10.3.187.64/29	10.3.187.65 – 10.3.187.70	10.3.187.71
106	10.3.187.72/29	10.3.187.73 – 10.3.187.78	10.3.187.79
107	10.3.187.80/29	10.3.187.81 – 10.3.187.86	10.3.187.87
108	10.3.187.88/29	10.3.187.89 – 10.3.187.94	10.3.187.95
109	10.3.187.96/29	10.3.187.97 – 10.3.187.102	10.3.187.103
110	10.3.187.104/29	10.3.187.105 – 10.3.187.110	10.3.187.111
111	10.3.187.112/29	10.3.187.113 – 10.3.187.118	10.3.187.119
112	10.3.187.120/29	10.3.187.121 – 10.3.187.126	10.3.187.127
113	10.3.187.128/29	10.3.187.129 – 10.3.187.134	10.3.187.135
114	10.3.187.136/29	10.3.187.137 – 10.3.187.142	10.3.187.143
115	10.3.187.144/29	10.3.187.145 – 10.3.187.150	10.3.187.151
116	10.3.187.152/29	10.3.187.153 – 10.3.187.158	10.3.187.159
117	10.3.187.160/29	10.3.187.161 – 10.3.187.166	10.3.187.167
118	10.3.187.168/29	10.3.187.169 – 10.3.187.174	10.3.187.175
119	10.3.187.176/29	10.3.187.177 – 10.3.187.182	10.3.187.183
120	10.3.187.184/29	10.3.187.185 – 10.3.187.190	10.3.187.191
121	10.3.187.192/29	10.3.187.193 – 10.3.187.198	10.3.187.199
122	10.3.187.200/29	10.3.187.201 – 10.3.187.206	10.3.187.207
123	10.3.187.208/29	10.3.187.209 – 10.3.187.214	10.3.187.215
124	10.3.187.216/29	10.3.187.217 – 10.3.187.222	10.3.187.223
125	10.3.187.224/29	10.3.187.225 – 10.3.187.230	10.3.187.231
126	10.3.187.232/29	10.3.187.233 – 10.3.187.238	10.3.187.239
127	10.3.187.240/29	10.3.187.241 – 10.3.187.246	10.3.187.247
128	10.3.187.248/29	10.3.187.249 – 10.3.187.254	10.3.187.255
129	10.3.188.0/29	10.3.188.1 – 10.3.188.6	10.3.188.7
130	10.3.188.8/29	10.3.188.9 – 10.3.188.14	10.3.188.15
131	10.3.188.16/29	10.3.188.17 – 10.3.188.22	10.3.188.23
132	10.3.188.24/29	10.3.188.25 – 10.3.188.30	10.3.188.31
133	10.3.188.32/29	10.3.188.33 – 10.3.188.38	10.3.188.39
134	10.3.188.40/29	10.3.188.41 – 10.3.188.46	10.3.188.47
135	10.3.188.48/29	10.3.188.49 – 10.3.188.54	10.3.188.55
136	10.3.188.56/29	10.3.188.57 – 10.3.188.62	10.3.188.63
137	10.3.188.64/29	10.3.188.65 – 10.3.188.70	10.3.188.71
138	10.3.188.72/29	10.3.188.73 – 10.3.188.78	10.3.188.79
139	10.3.188.80/29	10.3.188.81 – 10.3.188.86	10.3.188.87
140	10.3.188.88/29	10.3.188.89 – 10.3.188.94	10.3.188.95
141	10.3.188.96/29	10.3.188.97 – 10.3.188.102	10.3.188.103
142	10.3.188.104/29	10.3.188.105 – 10.3.188.110	10.3.188.111
143	10.3.188.112/29	10.3.188.113 – 10.3.188.118	10.3.188.119
144	10.3.188.120/29	10.3.188.121 – 10.3.188.126	10.3.188.127
145	10.3.188.128/29	10.3.188.129 – 10.3.188.134	10.3.188.135
146	10.3.188.136/29	10.3.188.137 – 10.3.188.142	10.3.188.143
147	10.3.188.144/29	10.3.188.145 – 10.3.188.150	10.3.188.151
148	10.3.188.152/29	10.3.188.153 – 10.3.188.158	10.3.188.159
149	10.3.188.160/29	10.3.188.161 – 10.3.188.166	10.3.188.167
150	10.3.188.168/29	10.3.188.169 – 10.3.188.174	10.3.188.175
151	10.3.188.176/29	10.3.188.177 – 10.3.188.182	10.3.188.183
152	10.3.188.184/29	10.3.188.185 – 10.3.188.190	10.3.188.191
153	10.3.188.192/29	10.3.188.193 – 10.3.188.198	10.3.188.199
154	10.3.188.200/29	10.3.188.201 – 10.3.188.206	10.3.188.207
155	10.3.188.208/29	10.3.188.209 – 10.3.188.214	10.3.188.215
156	10.3.188.216/29	10.3.188.217 – 10.3.188.222	10.3.188.223
157	10.3.188.224/29	10.3.188.225 – 10.3.188.230	10.3.188.231
158	10.3.188.232/29	10.3.188.233 – 10.3.188.238	10.3.188.239
159	10.3.188.240/29	10.3.188.241 – 10.3.188.246	10.3.188.247
160	10.3.188.248/29	10.3.188.249 – 10.3.188.254	10.3.188.255
161	10.3.189.0/29	10.3.189.1 – 10.3.189.6	10.3.189.7
162	10.3.189.8/29	10.3.189.9 – 10.3.189.14	10.3.189.15
163	10.3.189.16/29	10.3.189.17 – 10.3.189.22	10.3.189.23
164	10.3.189.24/29	10.3.189.25 – 10.3.189.30	10.3.189.31
165	10.3.189.32/29	10.3.189.33 – 10.3.189.38	10.3.189.39
166	10.3.189.40/29	10.3.189.41 – 10.3.189.46	10.3.189.47
167	10.3.189.48/29	10.3.189.49 – 10.3.189.54	10.3.189.55
168	10.3.189.56/29	10.3.189.57 – 10.3.189.62	10.3.189.63
169	10.3.189.64/29	10.3.189.65 – 10.3.189.70	10.3.189.71
170	10.3.189.72/29	10.3.189.73 – 10.3.189.78	10.3.189.79
171	10.3.189.80/29	10.3.189.81 – 10.3.189.86	10.3.189.87
172	10.3.189.88/29	10.3.189.89 – 10.3.189.94	10.3.189.95
173	10.3.189.96/29	10.3.189.97 – 10.3.189.102	10.3.189.103
174	10.3.189.104/29	10.3.189.105 – 10.3.189.110	10.3.189.111
175	10.3.189.112/29	10.3.189.113 – 10.3.189.118	10.3.189.119
176	10.3.189.120/29	10.3.189.121 – 10.3.189.126	10.3.189.127
177	10.3.189.128/29	10.3.189.129 – 10.3.189.134	10.3.189.135
178	10.3.189.136/29	10.3.189.137 – 10.3.189.142	10.3.189.143
179	10.3.189.144/29	10.3.189.145 – 10.3.189.150	10.3.189.151
180	10.3.189.152/29	10.3.189.153 – 10.3.189.158	10.3.189.159
181	10.3.189.160/29	10.3.189.161 – 10.3.189.166	10.3.189.167
182	10.3.189.168/29	10.3.189.169 – 10.3.189.174	10.3.189.175
183	10.3.189.176/29	10.3.189.177 – 10.3.189.182	10.3.189.183
184	10.3.189.184/29	10.3.189.185 – 10.3.189.190	10.3.189.191
185	10.3.189.192/29	10.3.189.193 – 10.3.189.198	10.3.189.199
186	10.3.189.200/29	10.3.189.201 – 10.3.189.206	10.3.189.207
187	10.3.189.208/29	10.3.189.209 – 10.3.189.214	10.3.189.215
188	10.3.189.216/29	10.3.189.217 – 10.3.189.222	10.3.189.223
189	10.3.189.224/29	10.3.189.225 – 10.3.189.230	10.3.189.231
190	10.3.189.232/29	10.3.189.233 – 10.3.189.238	10.3.189.239
191	10.3.189.240/29	10.3.189.241 – 10.3.189.246	10.3.189.247
192	10.3.189.248/29	10.3.189.249 – 10.3.189.254	10.3.189.255
193	10.3.190.0/29	10.3.190.1 – 10.3.190.6	10.3.190.7
194	10.3.190.8/29	10.3.190.9 – 10.3.190.14	10.3.190.15
195	10.3.190.16/29	10.3.190.17 – 10.3.190.22	10.3.190.23
196	10.3.190.24/29	10.3.190.25 – 10.3.190.30	10.3.190.31
197	10.3.190.32/29	10.3.190.33 – 10.3.190.38	10.3.190.39
198	10.3.190.40/29	10.3.190.41 – 10.3.190.46	10.3.190.47
199	10.3.190.48/29	10.3.190.49 – 10.3.190.54	10.3.190.55
200	10.3.190.56/29	10.3.190.57 – 10.3.190.62	10.3.190.63
201	10.3.190.64/29	10.3.190.65 – 10.3.190.70	10.3.190.71
202	10.3.190.72/29	10.3.190.73 – 10.3.190.78	10.3.190.79
203	10.3.190.80/29	10.3.190.81 – 10.3.190.86	10.3.190.87
204	10.3.190.88/29	10.3.190.89 – 10.3.190.94	10.3.190.95
205	10.3.190.96/29	10.3.190.97 – 10.3.190.102	10.3.190.103
206	10.3.190.104/29	10.3.190.105 – 10.3.190.110	10.3.190.111
207	10.3.190.112/29	10.3.190.113 – 10.3.190.118	10.3.190.119
208	10.3.190.120/29	10.3.190.121 – 10.3.190.126	10.3.190.127
209	10.3.190.128/29	10.3.190.129 – 10.3.190.134	10.3.190.135
210	10.3.190.136/29	10.3.190.137 – 10.3.190.142	10.3.190.143
211	10.3.190.144/29	10.3.190.145 – 10.3.190.150	10.3.190.151
212	10.3.190.152/29	10.3.190.153 – 10.3.190.158	10.3.190.159
213	10.3.190.160/29	10.3.190.161 – 10.3.190.166	10.3.190.167
214	10.3.190.168/29	10.3.190.169 – 10.3.190.174	10.3.190.175
215	10.3.190.176/29	10.3.190.177 – 10.3.190.182	10.3.190.183
216	10.3.190.184/29	10.3.190.185 – 10.3.190.190	10.3.190.191
217	10.3.190.192/29	10.3.190.193 – 10.3.190.198	10.3.190.199
218	10.3.190.200/29	10.3.190.201 – 10.3.190.206	10.3.190.207
219	10.3.190.208/29	10.3.190.209 – 10.3.190.214	10.3.190.215
220	10.3.190.216/29	10.3.190.217 – 10.3.190.222	10.3.190.223
221	10.3.190.224/29	10.3.190.225 – 10.3.190.230	10.3.190.231
222	10.3.190.232/29	10.3.190.233 – 10.3.190.238	10.3.190.239
223	10.3.190.240/29	10.3.190.241 – 10.3.190.246	10.3.190.247
224	10.3.190.248/29	10.3.190.249 – 10.3.190.254	10.3.190.255
225	10.3.191.0/29	10.3.191.1 – 10.3.191.6	10.3.191.7
226	10.3.191.8/29	10.3.191.9 – 10.3.191.14	10.3.191.15
227	10.3.191.16/29	10.3.191.17 – 10.3.191.22	10.3.191.23
228	10.3.191.24/29	10.3.191.25 – 10.3.191.30	10.3.191.31
229	10.3.191.32/29	10.3.191.33 – 10.3.191.38	10.3.191.39
230	10.3.191.40/29	10.3.191.41 – 10.3.191.46	10.3.191.47
231	10.3.191.48/29	10.3.191.49 – 10.3.191.54	10.3.191.55
232	10.3.191.56/29	10.3.191.57 – 10.3.191.62	10.3.191.63
233	10.3.191.64/29	10.3.191.65 – 10.3.191.70	10.3.191.71
234	10.3.191.72/29	10.3.191.73 – 10.3.191.78	10.3.191.79
235	10.3.191.80/29	10.3.191.81 – 10.3.191.86	10.3.191.87
236	10.3.191.88/29	10.3.191.89 – 10.3.191.94	10.3.191.95
237	10.3.191.96/29	10.3.191.97 – 10.3.191.102	10.3.191.103
238	10.3.191.104/29	10.3.191.105 – 10.3.191.110	10.3.191.111
239	10.3.191.112/29	10.3.191.113 – 10.3.191.118	10.3.191.119
240	10.3.191.120/29	10.3.191.121 – 10.3.191.126	10.3.191.127
241	10.3.191.128/29	10.3.191.129 – 10.3.191.134	10.3.191.135
242	10.3.191.136/29	10.3.191.137 – 10.3.191.142	10.3.191.143
243	10.3.191.144/29	10.3.191.145 – 10.3.191.150	10.3.191.151
244	10.3.191.152/29	10.3.191.153 – 10.3.191.158	10.3.191.159
245	10.3.191.160/29	10.3.191.161 – 10.3.191.166	10.3.191.167
246	10.3.191.168/29	10.3.191.169 – 10.3.191.174	10.3.191.175
247	10.3.191.176/29	10.3.191.177 – 10.3.191.182	10.3.191.183
248	10.3.191.184/29	10.3.191.185 – 10.3.191.190	10.3.191.191
249	10.3.191.192/29	10.3.191.193 – 10.3.191.198	10.3.191.199
250	10.3.191.200/29	10.3.191.201 – 10.3.191.206	10.3.191.207
251	10.3.191.208/29	10.3.191.209 – 10.3.191.214	10.3.191.215
252	10.3.191.216/29	10.3.191.217 – 10.3.191.222	10.3.191.223
253	10.3.191.224/29	10.3.191.225 – 10.3.191.230	10.3.191.231
254	10.3.191.232/29	10.3.191.233 – 10.3.191.238	10.3.191.239
255	10.3.191.240/29	10.3.191.241 – 10.3.191.246	10.3.191.247
256	10.3.191.248/29	10.3.191.249 – 10.3.191.254	10.3.191.255

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 →