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)10.12.128.0/20

network10.12.128.0/20

broadcast10.12.143.255

first host10.12.128.1

last host10.12.143.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.12.128.0/20

address00001010.00001100.10000000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001100.10000000.00000000

broadcast00001010.00001100.10001111.11111111

green = network part, grey = host part

hex0x0a0c8000

decimal168591360

reverse dns0.128.12.10.in-addr.arpa

ipv4-mapped::ffff:a0c:8000

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	10.12.128.0/29	10.12.128.1 – 10.12.128.6	10.12.128.7
2	10.12.128.8/29	10.12.128.9 – 10.12.128.14	10.12.128.15
3	10.12.128.16/29	10.12.128.17 – 10.12.128.22	10.12.128.23
4	10.12.128.24/29	10.12.128.25 – 10.12.128.30	10.12.128.31
5	10.12.128.32/29	10.12.128.33 – 10.12.128.38	10.12.128.39
6	10.12.128.40/29	10.12.128.41 – 10.12.128.46	10.12.128.47
7	10.12.128.48/29	10.12.128.49 – 10.12.128.54	10.12.128.55
8	10.12.128.56/29	10.12.128.57 – 10.12.128.62	10.12.128.63
9	10.12.128.64/29	10.12.128.65 – 10.12.128.70	10.12.128.71
10	10.12.128.72/29	10.12.128.73 – 10.12.128.78	10.12.128.79
11	10.12.128.80/29	10.12.128.81 – 10.12.128.86	10.12.128.87
12	10.12.128.88/29	10.12.128.89 – 10.12.128.94	10.12.128.95
13	10.12.128.96/29	10.12.128.97 – 10.12.128.102	10.12.128.103
14	10.12.128.104/29	10.12.128.105 – 10.12.128.110	10.12.128.111
15	10.12.128.112/29	10.12.128.113 – 10.12.128.118	10.12.128.119
16	10.12.128.120/29	10.12.128.121 – 10.12.128.126	10.12.128.127
17	10.12.128.128/29	10.12.128.129 – 10.12.128.134	10.12.128.135
18	10.12.128.136/29	10.12.128.137 – 10.12.128.142	10.12.128.143
19	10.12.128.144/29	10.12.128.145 – 10.12.128.150	10.12.128.151
20	10.12.128.152/29	10.12.128.153 – 10.12.128.158	10.12.128.159
21	10.12.128.160/29	10.12.128.161 – 10.12.128.166	10.12.128.167
22	10.12.128.168/29	10.12.128.169 – 10.12.128.174	10.12.128.175
23	10.12.128.176/29	10.12.128.177 – 10.12.128.182	10.12.128.183
24	10.12.128.184/29	10.12.128.185 – 10.12.128.190	10.12.128.191
25	10.12.128.192/29	10.12.128.193 – 10.12.128.198	10.12.128.199
26	10.12.128.200/29	10.12.128.201 – 10.12.128.206	10.12.128.207
27	10.12.128.208/29	10.12.128.209 – 10.12.128.214	10.12.128.215
28	10.12.128.216/29	10.12.128.217 – 10.12.128.222	10.12.128.223
29	10.12.128.224/29	10.12.128.225 – 10.12.128.230	10.12.128.231
30	10.12.128.232/29	10.12.128.233 – 10.12.128.238	10.12.128.239
31	10.12.128.240/29	10.12.128.241 – 10.12.128.246	10.12.128.247
32	10.12.128.248/29	10.12.128.249 – 10.12.128.254	10.12.128.255
33	10.12.129.0/29	10.12.129.1 – 10.12.129.6	10.12.129.7
34	10.12.129.8/29	10.12.129.9 – 10.12.129.14	10.12.129.15
35	10.12.129.16/29	10.12.129.17 – 10.12.129.22	10.12.129.23
36	10.12.129.24/29	10.12.129.25 – 10.12.129.30	10.12.129.31
37	10.12.129.32/29	10.12.129.33 – 10.12.129.38	10.12.129.39
38	10.12.129.40/29	10.12.129.41 – 10.12.129.46	10.12.129.47
39	10.12.129.48/29	10.12.129.49 – 10.12.129.54	10.12.129.55
40	10.12.129.56/29	10.12.129.57 – 10.12.129.62	10.12.129.63
41	10.12.129.64/29	10.12.129.65 – 10.12.129.70	10.12.129.71
42	10.12.129.72/29	10.12.129.73 – 10.12.129.78	10.12.129.79
43	10.12.129.80/29	10.12.129.81 – 10.12.129.86	10.12.129.87
44	10.12.129.88/29	10.12.129.89 – 10.12.129.94	10.12.129.95
45	10.12.129.96/29	10.12.129.97 – 10.12.129.102	10.12.129.103
46	10.12.129.104/29	10.12.129.105 – 10.12.129.110	10.12.129.111
47	10.12.129.112/29	10.12.129.113 – 10.12.129.118	10.12.129.119
48	10.12.129.120/29	10.12.129.121 – 10.12.129.126	10.12.129.127
49	10.12.129.128/29	10.12.129.129 – 10.12.129.134	10.12.129.135
50	10.12.129.136/29	10.12.129.137 – 10.12.129.142	10.12.129.143
51	10.12.129.144/29	10.12.129.145 – 10.12.129.150	10.12.129.151
52	10.12.129.152/29	10.12.129.153 – 10.12.129.158	10.12.129.159
53	10.12.129.160/29	10.12.129.161 – 10.12.129.166	10.12.129.167
54	10.12.129.168/29	10.12.129.169 – 10.12.129.174	10.12.129.175
55	10.12.129.176/29	10.12.129.177 – 10.12.129.182	10.12.129.183
56	10.12.129.184/29	10.12.129.185 – 10.12.129.190	10.12.129.191
57	10.12.129.192/29	10.12.129.193 – 10.12.129.198	10.12.129.199
58	10.12.129.200/29	10.12.129.201 – 10.12.129.206	10.12.129.207
59	10.12.129.208/29	10.12.129.209 – 10.12.129.214	10.12.129.215
60	10.12.129.216/29	10.12.129.217 – 10.12.129.222	10.12.129.223
61	10.12.129.224/29	10.12.129.225 – 10.12.129.230	10.12.129.231
62	10.12.129.232/29	10.12.129.233 – 10.12.129.238	10.12.129.239
63	10.12.129.240/29	10.12.129.241 – 10.12.129.246	10.12.129.247
64	10.12.129.248/29	10.12.129.249 – 10.12.129.254	10.12.129.255
65	10.12.130.0/29	10.12.130.1 – 10.12.130.6	10.12.130.7
66	10.12.130.8/29	10.12.130.9 – 10.12.130.14	10.12.130.15
67	10.12.130.16/29	10.12.130.17 – 10.12.130.22	10.12.130.23
68	10.12.130.24/29	10.12.130.25 – 10.12.130.30	10.12.130.31
69	10.12.130.32/29	10.12.130.33 – 10.12.130.38	10.12.130.39
70	10.12.130.40/29	10.12.130.41 – 10.12.130.46	10.12.130.47
71	10.12.130.48/29	10.12.130.49 – 10.12.130.54	10.12.130.55
72	10.12.130.56/29	10.12.130.57 – 10.12.130.62	10.12.130.63
73	10.12.130.64/29	10.12.130.65 – 10.12.130.70	10.12.130.71
74	10.12.130.72/29	10.12.130.73 – 10.12.130.78	10.12.130.79
75	10.12.130.80/29	10.12.130.81 – 10.12.130.86	10.12.130.87
76	10.12.130.88/29	10.12.130.89 – 10.12.130.94	10.12.130.95
77	10.12.130.96/29	10.12.130.97 – 10.12.130.102	10.12.130.103
78	10.12.130.104/29	10.12.130.105 – 10.12.130.110	10.12.130.111
79	10.12.130.112/29	10.12.130.113 – 10.12.130.118	10.12.130.119
80	10.12.130.120/29	10.12.130.121 – 10.12.130.126	10.12.130.127
81	10.12.130.128/29	10.12.130.129 – 10.12.130.134	10.12.130.135
82	10.12.130.136/29	10.12.130.137 – 10.12.130.142	10.12.130.143
83	10.12.130.144/29	10.12.130.145 – 10.12.130.150	10.12.130.151
84	10.12.130.152/29	10.12.130.153 – 10.12.130.158	10.12.130.159
85	10.12.130.160/29	10.12.130.161 – 10.12.130.166	10.12.130.167
86	10.12.130.168/29	10.12.130.169 – 10.12.130.174	10.12.130.175
87	10.12.130.176/29	10.12.130.177 – 10.12.130.182	10.12.130.183
88	10.12.130.184/29	10.12.130.185 – 10.12.130.190	10.12.130.191
89	10.12.130.192/29	10.12.130.193 – 10.12.130.198	10.12.130.199
90	10.12.130.200/29	10.12.130.201 – 10.12.130.206	10.12.130.207
91	10.12.130.208/29	10.12.130.209 – 10.12.130.214	10.12.130.215
92	10.12.130.216/29	10.12.130.217 – 10.12.130.222	10.12.130.223
93	10.12.130.224/29	10.12.130.225 – 10.12.130.230	10.12.130.231
94	10.12.130.232/29	10.12.130.233 – 10.12.130.238	10.12.130.239
95	10.12.130.240/29	10.12.130.241 – 10.12.130.246	10.12.130.247
96	10.12.130.248/29	10.12.130.249 – 10.12.130.254	10.12.130.255
97	10.12.131.0/29	10.12.131.1 – 10.12.131.6	10.12.131.7
98	10.12.131.8/29	10.12.131.9 – 10.12.131.14	10.12.131.15
99	10.12.131.16/29	10.12.131.17 – 10.12.131.22	10.12.131.23
100	10.12.131.24/29	10.12.131.25 – 10.12.131.30	10.12.131.31
101	10.12.131.32/29	10.12.131.33 – 10.12.131.38	10.12.131.39
102	10.12.131.40/29	10.12.131.41 – 10.12.131.46	10.12.131.47
103	10.12.131.48/29	10.12.131.49 – 10.12.131.54	10.12.131.55
104	10.12.131.56/29	10.12.131.57 – 10.12.131.62	10.12.131.63
105	10.12.131.64/29	10.12.131.65 – 10.12.131.70	10.12.131.71
106	10.12.131.72/29	10.12.131.73 – 10.12.131.78	10.12.131.79
107	10.12.131.80/29	10.12.131.81 – 10.12.131.86	10.12.131.87
108	10.12.131.88/29	10.12.131.89 – 10.12.131.94	10.12.131.95
109	10.12.131.96/29	10.12.131.97 – 10.12.131.102	10.12.131.103
110	10.12.131.104/29	10.12.131.105 – 10.12.131.110	10.12.131.111
111	10.12.131.112/29	10.12.131.113 – 10.12.131.118	10.12.131.119
112	10.12.131.120/29	10.12.131.121 – 10.12.131.126	10.12.131.127
113	10.12.131.128/29	10.12.131.129 – 10.12.131.134	10.12.131.135
114	10.12.131.136/29	10.12.131.137 – 10.12.131.142	10.12.131.143
115	10.12.131.144/29	10.12.131.145 – 10.12.131.150	10.12.131.151
116	10.12.131.152/29	10.12.131.153 – 10.12.131.158	10.12.131.159
117	10.12.131.160/29	10.12.131.161 – 10.12.131.166	10.12.131.167
118	10.12.131.168/29	10.12.131.169 – 10.12.131.174	10.12.131.175
119	10.12.131.176/29	10.12.131.177 – 10.12.131.182	10.12.131.183
120	10.12.131.184/29	10.12.131.185 – 10.12.131.190	10.12.131.191
121	10.12.131.192/29	10.12.131.193 – 10.12.131.198	10.12.131.199
122	10.12.131.200/29	10.12.131.201 – 10.12.131.206	10.12.131.207
123	10.12.131.208/29	10.12.131.209 – 10.12.131.214	10.12.131.215
124	10.12.131.216/29	10.12.131.217 – 10.12.131.222	10.12.131.223
125	10.12.131.224/29	10.12.131.225 – 10.12.131.230	10.12.131.231
126	10.12.131.232/29	10.12.131.233 – 10.12.131.238	10.12.131.239
127	10.12.131.240/29	10.12.131.241 – 10.12.131.246	10.12.131.247
128	10.12.131.248/29	10.12.131.249 – 10.12.131.254	10.12.131.255
129	10.12.132.0/29	10.12.132.1 – 10.12.132.6	10.12.132.7
130	10.12.132.8/29	10.12.132.9 – 10.12.132.14	10.12.132.15
131	10.12.132.16/29	10.12.132.17 – 10.12.132.22	10.12.132.23
132	10.12.132.24/29	10.12.132.25 – 10.12.132.30	10.12.132.31
133	10.12.132.32/29	10.12.132.33 – 10.12.132.38	10.12.132.39
134	10.12.132.40/29	10.12.132.41 – 10.12.132.46	10.12.132.47
135	10.12.132.48/29	10.12.132.49 – 10.12.132.54	10.12.132.55
136	10.12.132.56/29	10.12.132.57 – 10.12.132.62	10.12.132.63
137	10.12.132.64/29	10.12.132.65 – 10.12.132.70	10.12.132.71
138	10.12.132.72/29	10.12.132.73 – 10.12.132.78	10.12.132.79
139	10.12.132.80/29	10.12.132.81 – 10.12.132.86	10.12.132.87
140	10.12.132.88/29	10.12.132.89 – 10.12.132.94	10.12.132.95
141	10.12.132.96/29	10.12.132.97 – 10.12.132.102	10.12.132.103
142	10.12.132.104/29	10.12.132.105 – 10.12.132.110	10.12.132.111
143	10.12.132.112/29	10.12.132.113 – 10.12.132.118	10.12.132.119
144	10.12.132.120/29	10.12.132.121 – 10.12.132.126	10.12.132.127
145	10.12.132.128/29	10.12.132.129 – 10.12.132.134	10.12.132.135
146	10.12.132.136/29	10.12.132.137 – 10.12.132.142	10.12.132.143
147	10.12.132.144/29	10.12.132.145 – 10.12.132.150	10.12.132.151
148	10.12.132.152/29	10.12.132.153 – 10.12.132.158	10.12.132.159
149	10.12.132.160/29	10.12.132.161 – 10.12.132.166	10.12.132.167
150	10.12.132.168/29	10.12.132.169 – 10.12.132.174	10.12.132.175
151	10.12.132.176/29	10.12.132.177 – 10.12.132.182	10.12.132.183
152	10.12.132.184/29	10.12.132.185 – 10.12.132.190	10.12.132.191
153	10.12.132.192/29	10.12.132.193 – 10.12.132.198	10.12.132.199
154	10.12.132.200/29	10.12.132.201 – 10.12.132.206	10.12.132.207
155	10.12.132.208/29	10.12.132.209 – 10.12.132.214	10.12.132.215
156	10.12.132.216/29	10.12.132.217 – 10.12.132.222	10.12.132.223
157	10.12.132.224/29	10.12.132.225 – 10.12.132.230	10.12.132.231
158	10.12.132.232/29	10.12.132.233 – 10.12.132.238	10.12.132.239
159	10.12.132.240/29	10.12.132.241 – 10.12.132.246	10.12.132.247
160	10.12.132.248/29	10.12.132.249 – 10.12.132.254	10.12.132.255
161	10.12.133.0/29	10.12.133.1 – 10.12.133.6	10.12.133.7
162	10.12.133.8/29	10.12.133.9 – 10.12.133.14	10.12.133.15
163	10.12.133.16/29	10.12.133.17 – 10.12.133.22	10.12.133.23
164	10.12.133.24/29	10.12.133.25 – 10.12.133.30	10.12.133.31
165	10.12.133.32/29	10.12.133.33 – 10.12.133.38	10.12.133.39
166	10.12.133.40/29	10.12.133.41 – 10.12.133.46	10.12.133.47
167	10.12.133.48/29	10.12.133.49 – 10.12.133.54	10.12.133.55
168	10.12.133.56/29	10.12.133.57 – 10.12.133.62	10.12.133.63
169	10.12.133.64/29	10.12.133.65 – 10.12.133.70	10.12.133.71
170	10.12.133.72/29	10.12.133.73 – 10.12.133.78	10.12.133.79
171	10.12.133.80/29	10.12.133.81 – 10.12.133.86	10.12.133.87
172	10.12.133.88/29	10.12.133.89 – 10.12.133.94	10.12.133.95
173	10.12.133.96/29	10.12.133.97 – 10.12.133.102	10.12.133.103
174	10.12.133.104/29	10.12.133.105 – 10.12.133.110	10.12.133.111
175	10.12.133.112/29	10.12.133.113 – 10.12.133.118	10.12.133.119
176	10.12.133.120/29	10.12.133.121 – 10.12.133.126	10.12.133.127
177	10.12.133.128/29	10.12.133.129 – 10.12.133.134	10.12.133.135
178	10.12.133.136/29	10.12.133.137 – 10.12.133.142	10.12.133.143
179	10.12.133.144/29	10.12.133.145 – 10.12.133.150	10.12.133.151
180	10.12.133.152/29	10.12.133.153 – 10.12.133.158	10.12.133.159
181	10.12.133.160/29	10.12.133.161 – 10.12.133.166	10.12.133.167
182	10.12.133.168/29	10.12.133.169 – 10.12.133.174	10.12.133.175
183	10.12.133.176/29	10.12.133.177 – 10.12.133.182	10.12.133.183
184	10.12.133.184/29	10.12.133.185 – 10.12.133.190	10.12.133.191
185	10.12.133.192/29	10.12.133.193 – 10.12.133.198	10.12.133.199
186	10.12.133.200/29	10.12.133.201 – 10.12.133.206	10.12.133.207
187	10.12.133.208/29	10.12.133.209 – 10.12.133.214	10.12.133.215
188	10.12.133.216/29	10.12.133.217 – 10.12.133.222	10.12.133.223
189	10.12.133.224/29	10.12.133.225 – 10.12.133.230	10.12.133.231
190	10.12.133.232/29	10.12.133.233 – 10.12.133.238	10.12.133.239
191	10.12.133.240/29	10.12.133.241 – 10.12.133.246	10.12.133.247
192	10.12.133.248/29	10.12.133.249 – 10.12.133.254	10.12.133.255
193	10.12.134.0/29	10.12.134.1 – 10.12.134.6	10.12.134.7
194	10.12.134.8/29	10.12.134.9 – 10.12.134.14	10.12.134.15
195	10.12.134.16/29	10.12.134.17 – 10.12.134.22	10.12.134.23
196	10.12.134.24/29	10.12.134.25 – 10.12.134.30	10.12.134.31
197	10.12.134.32/29	10.12.134.33 – 10.12.134.38	10.12.134.39
198	10.12.134.40/29	10.12.134.41 – 10.12.134.46	10.12.134.47
199	10.12.134.48/29	10.12.134.49 – 10.12.134.54	10.12.134.55
200	10.12.134.56/29	10.12.134.57 – 10.12.134.62	10.12.134.63
201	10.12.134.64/29	10.12.134.65 – 10.12.134.70	10.12.134.71
202	10.12.134.72/29	10.12.134.73 – 10.12.134.78	10.12.134.79
203	10.12.134.80/29	10.12.134.81 – 10.12.134.86	10.12.134.87
204	10.12.134.88/29	10.12.134.89 – 10.12.134.94	10.12.134.95
205	10.12.134.96/29	10.12.134.97 – 10.12.134.102	10.12.134.103
206	10.12.134.104/29	10.12.134.105 – 10.12.134.110	10.12.134.111
207	10.12.134.112/29	10.12.134.113 – 10.12.134.118	10.12.134.119
208	10.12.134.120/29	10.12.134.121 – 10.12.134.126	10.12.134.127
209	10.12.134.128/29	10.12.134.129 – 10.12.134.134	10.12.134.135
210	10.12.134.136/29	10.12.134.137 – 10.12.134.142	10.12.134.143
211	10.12.134.144/29	10.12.134.145 – 10.12.134.150	10.12.134.151
212	10.12.134.152/29	10.12.134.153 – 10.12.134.158	10.12.134.159
213	10.12.134.160/29	10.12.134.161 – 10.12.134.166	10.12.134.167
214	10.12.134.168/29	10.12.134.169 – 10.12.134.174	10.12.134.175
215	10.12.134.176/29	10.12.134.177 – 10.12.134.182	10.12.134.183
216	10.12.134.184/29	10.12.134.185 – 10.12.134.190	10.12.134.191
217	10.12.134.192/29	10.12.134.193 – 10.12.134.198	10.12.134.199
218	10.12.134.200/29	10.12.134.201 – 10.12.134.206	10.12.134.207
219	10.12.134.208/29	10.12.134.209 – 10.12.134.214	10.12.134.215
220	10.12.134.216/29	10.12.134.217 – 10.12.134.222	10.12.134.223
221	10.12.134.224/29	10.12.134.225 – 10.12.134.230	10.12.134.231
222	10.12.134.232/29	10.12.134.233 – 10.12.134.238	10.12.134.239
223	10.12.134.240/29	10.12.134.241 – 10.12.134.246	10.12.134.247
224	10.12.134.248/29	10.12.134.249 – 10.12.134.254	10.12.134.255
225	10.12.135.0/29	10.12.135.1 – 10.12.135.6	10.12.135.7
226	10.12.135.8/29	10.12.135.9 – 10.12.135.14	10.12.135.15
227	10.12.135.16/29	10.12.135.17 – 10.12.135.22	10.12.135.23
228	10.12.135.24/29	10.12.135.25 – 10.12.135.30	10.12.135.31
229	10.12.135.32/29	10.12.135.33 – 10.12.135.38	10.12.135.39
230	10.12.135.40/29	10.12.135.41 – 10.12.135.46	10.12.135.47
231	10.12.135.48/29	10.12.135.49 – 10.12.135.54	10.12.135.55
232	10.12.135.56/29	10.12.135.57 – 10.12.135.62	10.12.135.63
233	10.12.135.64/29	10.12.135.65 – 10.12.135.70	10.12.135.71
234	10.12.135.72/29	10.12.135.73 – 10.12.135.78	10.12.135.79
235	10.12.135.80/29	10.12.135.81 – 10.12.135.86	10.12.135.87
236	10.12.135.88/29	10.12.135.89 – 10.12.135.94	10.12.135.95
237	10.12.135.96/29	10.12.135.97 – 10.12.135.102	10.12.135.103
238	10.12.135.104/29	10.12.135.105 – 10.12.135.110	10.12.135.111
239	10.12.135.112/29	10.12.135.113 – 10.12.135.118	10.12.135.119
240	10.12.135.120/29	10.12.135.121 – 10.12.135.126	10.12.135.127
241	10.12.135.128/29	10.12.135.129 – 10.12.135.134	10.12.135.135
242	10.12.135.136/29	10.12.135.137 – 10.12.135.142	10.12.135.143
243	10.12.135.144/29	10.12.135.145 – 10.12.135.150	10.12.135.151
244	10.12.135.152/29	10.12.135.153 – 10.12.135.158	10.12.135.159
245	10.12.135.160/29	10.12.135.161 – 10.12.135.166	10.12.135.167
246	10.12.135.168/29	10.12.135.169 – 10.12.135.174	10.12.135.175
247	10.12.135.176/29	10.12.135.177 – 10.12.135.182	10.12.135.183
248	10.12.135.184/29	10.12.135.185 – 10.12.135.190	10.12.135.191
249	10.12.135.192/29	10.12.135.193 – 10.12.135.198	10.12.135.199
250	10.12.135.200/29	10.12.135.201 – 10.12.135.206	10.12.135.207
251	10.12.135.208/29	10.12.135.209 – 10.12.135.214	10.12.135.215
252	10.12.135.216/29	10.12.135.217 – 10.12.135.222	10.12.135.223
253	10.12.135.224/29	10.12.135.225 – 10.12.135.230	10.12.135.231
254	10.12.135.232/29	10.12.135.233 – 10.12.135.238	10.12.135.239
255	10.12.135.240/29	10.12.135.241 – 10.12.135.246	10.12.135.247
256	10.12.135.248/29	10.12.135.249 – 10.12.135.254	10.12.135.255

showing 256 of 512

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 →