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)10.12.144.0/20

network10.12.144.0/20

broadcast10.12.159.255

first host10.12.144.1

last host10.12.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.12.144.0/20

address00001010.00001100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001100.10010000.00000000

broadcast00001010.00001100.10011111.11111111

green = network part, grey = host part

hex0x0a0c9000

decimal168595456

reverse dns0.144.12.10.in-addr.arpa

ipv4-mapped::ffff:a0c:9000

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	10.12.144.0/29	10.12.144.1 – 10.12.144.6	10.12.144.7
2	10.12.144.8/29	10.12.144.9 – 10.12.144.14	10.12.144.15
3	10.12.144.16/29	10.12.144.17 – 10.12.144.22	10.12.144.23
4	10.12.144.24/29	10.12.144.25 – 10.12.144.30	10.12.144.31
5	10.12.144.32/29	10.12.144.33 – 10.12.144.38	10.12.144.39
6	10.12.144.40/29	10.12.144.41 – 10.12.144.46	10.12.144.47
7	10.12.144.48/29	10.12.144.49 – 10.12.144.54	10.12.144.55
8	10.12.144.56/29	10.12.144.57 – 10.12.144.62	10.12.144.63
9	10.12.144.64/29	10.12.144.65 – 10.12.144.70	10.12.144.71
10	10.12.144.72/29	10.12.144.73 – 10.12.144.78	10.12.144.79
11	10.12.144.80/29	10.12.144.81 – 10.12.144.86	10.12.144.87
12	10.12.144.88/29	10.12.144.89 – 10.12.144.94	10.12.144.95
13	10.12.144.96/29	10.12.144.97 – 10.12.144.102	10.12.144.103
14	10.12.144.104/29	10.12.144.105 – 10.12.144.110	10.12.144.111
15	10.12.144.112/29	10.12.144.113 – 10.12.144.118	10.12.144.119
16	10.12.144.120/29	10.12.144.121 – 10.12.144.126	10.12.144.127
17	10.12.144.128/29	10.12.144.129 – 10.12.144.134	10.12.144.135
18	10.12.144.136/29	10.12.144.137 – 10.12.144.142	10.12.144.143
19	10.12.144.144/29	10.12.144.145 – 10.12.144.150	10.12.144.151
20	10.12.144.152/29	10.12.144.153 – 10.12.144.158	10.12.144.159
21	10.12.144.160/29	10.12.144.161 – 10.12.144.166	10.12.144.167
22	10.12.144.168/29	10.12.144.169 – 10.12.144.174	10.12.144.175
23	10.12.144.176/29	10.12.144.177 – 10.12.144.182	10.12.144.183
24	10.12.144.184/29	10.12.144.185 – 10.12.144.190	10.12.144.191
25	10.12.144.192/29	10.12.144.193 – 10.12.144.198	10.12.144.199
26	10.12.144.200/29	10.12.144.201 – 10.12.144.206	10.12.144.207
27	10.12.144.208/29	10.12.144.209 – 10.12.144.214	10.12.144.215
28	10.12.144.216/29	10.12.144.217 – 10.12.144.222	10.12.144.223
29	10.12.144.224/29	10.12.144.225 – 10.12.144.230	10.12.144.231
30	10.12.144.232/29	10.12.144.233 – 10.12.144.238	10.12.144.239
31	10.12.144.240/29	10.12.144.241 – 10.12.144.246	10.12.144.247
32	10.12.144.248/29	10.12.144.249 – 10.12.144.254	10.12.144.255
33	10.12.145.0/29	10.12.145.1 – 10.12.145.6	10.12.145.7
34	10.12.145.8/29	10.12.145.9 – 10.12.145.14	10.12.145.15
35	10.12.145.16/29	10.12.145.17 – 10.12.145.22	10.12.145.23
36	10.12.145.24/29	10.12.145.25 – 10.12.145.30	10.12.145.31
37	10.12.145.32/29	10.12.145.33 – 10.12.145.38	10.12.145.39
38	10.12.145.40/29	10.12.145.41 – 10.12.145.46	10.12.145.47
39	10.12.145.48/29	10.12.145.49 – 10.12.145.54	10.12.145.55
40	10.12.145.56/29	10.12.145.57 – 10.12.145.62	10.12.145.63
41	10.12.145.64/29	10.12.145.65 – 10.12.145.70	10.12.145.71
42	10.12.145.72/29	10.12.145.73 – 10.12.145.78	10.12.145.79
43	10.12.145.80/29	10.12.145.81 – 10.12.145.86	10.12.145.87
44	10.12.145.88/29	10.12.145.89 – 10.12.145.94	10.12.145.95
45	10.12.145.96/29	10.12.145.97 – 10.12.145.102	10.12.145.103
46	10.12.145.104/29	10.12.145.105 – 10.12.145.110	10.12.145.111
47	10.12.145.112/29	10.12.145.113 – 10.12.145.118	10.12.145.119
48	10.12.145.120/29	10.12.145.121 – 10.12.145.126	10.12.145.127
49	10.12.145.128/29	10.12.145.129 – 10.12.145.134	10.12.145.135
50	10.12.145.136/29	10.12.145.137 – 10.12.145.142	10.12.145.143
51	10.12.145.144/29	10.12.145.145 – 10.12.145.150	10.12.145.151
52	10.12.145.152/29	10.12.145.153 – 10.12.145.158	10.12.145.159
53	10.12.145.160/29	10.12.145.161 – 10.12.145.166	10.12.145.167
54	10.12.145.168/29	10.12.145.169 – 10.12.145.174	10.12.145.175
55	10.12.145.176/29	10.12.145.177 – 10.12.145.182	10.12.145.183
56	10.12.145.184/29	10.12.145.185 – 10.12.145.190	10.12.145.191
57	10.12.145.192/29	10.12.145.193 – 10.12.145.198	10.12.145.199
58	10.12.145.200/29	10.12.145.201 – 10.12.145.206	10.12.145.207
59	10.12.145.208/29	10.12.145.209 – 10.12.145.214	10.12.145.215
60	10.12.145.216/29	10.12.145.217 – 10.12.145.222	10.12.145.223
61	10.12.145.224/29	10.12.145.225 – 10.12.145.230	10.12.145.231
62	10.12.145.232/29	10.12.145.233 – 10.12.145.238	10.12.145.239
63	10.12.145.240/29	10.12.145.241 – 10.12.145.246	10.12.145.247
64	10.12.145.248/29	10.12.145.249 – 10.12.145.254	10.12.145.255
65	10.12.146.0/29	10.12.146.1 – 10.12.146.6	10.12.146.7
66	10.12.146.8/29	10.12.146.9 – 10.12.146.14	10.12.146.15
67	10.12.146.16/29	10.12.146.17 – 10.12.146.22	10.12.146.23
68	10.12.146.24/29	10.12.146.25 – 10.12.146.30	10.12.146.31
69	10.12.146.32/29	10.12.146.33 – 10.12.146.38	10.12.146.39
70	10.12.146.40/29	10.12.146.41 – 10.12.146.46	10.12.146.47
71	10.12.146.48/29	10.12.146.49 – 10.12.146.54	10.12.146.55
72	10.12.146.56/29	10.12.146.57 – 10.12.146.62	10.12.146.63
73	10.12.146.64/29	10.12.146.65 – 10.12.146.70	10.12.146.71
74	10.12.146.72/29	10.12.146.73 – 10.12.146.78	10.12.146.79
75	10.12.146.80/29	10.12.146.81 – 10.12.146.86	10.12.146.87
76	10.12.146.88/29	10.12.146.89 – 10.12.146.94	10.12.146.95
77	10.12.146.96/29	10.12.146.97 – 10.12.146.102	10.12.146.103
78	10.12.146.104/29	10.12.146.105 – 10.12.146.110	10.12.146.111
79	10.12.146.112/29	10.12.146.113 – 10.12.146.118	10.12.146.119
80	10.12.146.120/29	10.12.146.121 – 10.12.146.126	10.12.146.127
81	10.12.146.128/29	10.12.146.129 – 10.12.146.134	10.12.146.135
82	10.12.146.136/29	10.12.146.137 – 10.12.146.142	10.12.146.143
83	10.12.146.144/29	10.12.146.145 – 10.12.146.150	10.12.146.151
84	10.12.146.152/29	10.12.146.153 – 10.12.146.158	10.12.146.159
85	10.12.146.160/29	10.12.146.161 – 10.12.146.166	10.12.146.167
86	10.12.146.168/29	10.12.146.169 – 10.12.146.174	10.12.146.175
87	10.12.146.176/29	10.12.146.177 – 10.12.146.182	10.12.146.183
88	10.12.146.184/29	10.12.146.185 – 10.12.146.190	10.12.146.191
89	10.12.146.192/29	10.12.146.193 – 10.12.146.198	10.12.146.199
90	10.12.146.200/29	10.12.146.201 – 10.12.146.206	10.12.146.207
91	10.12.146.208/29	10.12.146.209 – 10.12.146.214	10.12.146.215
92	10.12.146.216/29	10.12.146.217 – 10.12.146.222	10.12.146.223
93	10.12.146.224/29	10.12.146.225 – 10.12.146.230	10.12.146.231
94	10.12.146.232/29	10.12.146.233 – 10.12.146.238	10.12.146.239
95	10.12.146.240/29	10.12.146.241 – 10.12.146.246	10.12.146.247
96	10.12.146.248/29	10.12.146.249 – 10.12.146.254	10.12.146.255
97	10.12.147.0/29	10.12.147.1 – 10.12.147.6	10.12.147.7
98	10.12.147.8/29	10.12.147.9 – 10.12.147.14	10.12.147.15
99	10.12.147.16/29	10.12.147.17 – 10.12.147.22	10.12.147.23
100	10.12.147.24/29	10.12.147.25 – 10.12.147.30	10.12.147.31
101	10.12.147.32/29	10.12.147.33 – 10.12.147.38	10.12.147.39
102	10.12.147.40/29	10.12.147.41 – 10.12.147.46	10.12.147.47
103	10.12.147.48/29	10.12.147.49 – 10.12.147.54	10.12.147.55
104	10.12.147.56/29	10.12.147.57 – 10.12.147.62	10.12.147.63
105	10.12.147.64/29	10.12.147.65 – 10.12.147.70	10.12.147.71
106	10.12.147.72/29	10.12.147.73 – 10.12.147.78	10.12.147.79
107	10.12.147.80/29	10.12.147.81 – 10.12.147.86	10.12.147.87
108	10.12.147.88/29	10.12.147.89 – 10.12.147.94	10.12.147.95
109	10.12.147.96/29	10.12.147.97 – 10.12.147.102	10.12.147.103
110	10.12.147.104/29	10.12.147.105 – 10.12.147.110	10.12.147.111
111	10.12.147.112/29	10.12.147.113 – 10.12.147.118	10.12.147.119
112	10.12.147.120/29	10.12.147.121 – 10.12.147.126	10.12.147.127
113	10.12.147.128/29	10.12.147.129 – 10.12.147.134	10.12.147.135
114	10.12.147.136/29	10.12.147.137 – 10.12.147.142	10.12.147.143
115	10.12.147.144/29	10.12.147.145 – 10.12.147.150	10.12.147.151
116	10.12.147.152/29	10.12.147.153 – 10.12.147.158	10.12.147.159
117	10.12.147.160/29	10.12.147.161 – 10.12.147.166	10.12.147.167
118	10.12.147.168/29	10.12.147.169 – 10.12.147.174	10.12.147.175
119	10.12.147.176/29	10.12.147.177 – 10.12.147.182	10.12.147.183
120	10.12.147.184/29	10.12.147.185 – 10.12.147.190	10.12.147.191
121	10.12.147.192/29	10.12.147.193 – 10.12.147.198	10.12.147.199
122	10.12.147.200/29	10.12.147.201 – 10.12.147.206	10.12.147.207
123	10.12.147.208/29	10.12.147.209 – 10.12.147.214	10.12.147.215
124	10.12.147.216/29	10.12.147.217 – 10.12.147.222	10.12.147.223
125	10.12.147.224/29	10.12.147.225 – 10.12.147.230	10.12.147.231
126	10.12.147.232/29	10.12.147.233 – 10.12.147.238	10.12.147.239
127	10.12.147.240/29	10.12.147.241 – 10.12.147.246	10.12.147.247
128	10.12.147.248/29	10.12.147.249 – 10.12.147.254	10.12.147.255
129	10.12.148.0/29	10.12.148.1 – 10.12.148.6	10.12.148.7
130	10.12.148.8/29	10.12.148.9 – 10.12.148.14	10.12.148.15
131	10.12.148.16/29	10.12.148.17 – 10.12.148.22	10.12.148.23
132	10.12.148.24/29	10.12.148.25 – 10.12.148.30	10.12.148.31
133	10.12.148.32/29	10.12.148.33 – 10.12.148.38	10.12.148.39
134	10.12.148.40/29	10.12.148.41 – 10.12.148.46	10.12.148.47
135	10.12.148.48/29	10.12.148.49 – 10.12.148.54	10.12.148.55
136	10.12.148.56/29	10.12.148.57 – 10.12.148.62	10.12.148.63
137	10.12.148.64/29	10.12.148.65 – 10.12.148.70	10.12.148.71
138	10.12.148.72/29	10.12.148.73 – 10.12.148.78	10.12.148.79
139	10.12.148.80/29	10.12.148.81 – 10.12.148.86	10.12.148.87
140	10.12.148.88/29	10.12.148.89 – 10.12.148.94	10.12.148.95
141	10.12.148.96/29	10.12.148.97 – 10.12.148.102	10.12.148.103
142	10.12.148.104/29	10.12.148.105 – 10.12.148.110	10.12.148.111
143	10.12.148.112/29	10.12.148.113 – 10.12.148.118	10.12.148.119
144	10.12.148.120/29	10.12.148.121 – 10.12.148.126	10.12.148.127
145	10.12.148.128/29	10.12.148.129 – 10.12.148.134	10.12.148.135
146	10.12.148.136/29	10.12.148.137 – 10.12.148.142	10.12.148.143
147	10.12.148.144/29	10.12.148.145 – 10.12.148.150	10.12.148.151
148	10.12.148.152/29	10.12.148.153 – 10.12.148.158	10.12.148.159
149	10.12.148.160/29	10.12.148.161 – 10.12.148.166	10.12.148.167
150	10.12.148.168/29	10.12.148.169 – 10.12.148.174	10.12.148.175
151	10.12.148.176/29	10.12.148.177 – 10.12.148.182	10.12.148.183
152	10.12.148.184/29	10.12.148.185 – 10.12.148.190	10.12.148.191
153	10.12.148.192/29	10.12.148.193 – 10.12.148.198	10.12.148.199
154	10.12.148.200/29	10.12.148.201 – 10.12.148.206	10.12.148.207
155	10.12.148.208/29	10.12.148.209 – 10.12.148.214	10.12.148.215
156	10.12.148.216/29	10.12.148.217 – 10.12.148.222	10.12.148.223
157	10.12.148.224/29	10.12.148.225 – 10.12.148.230	10.12.148.231
158	10.12.148.232/29	10.12.148.233 – 10.12.148.238	10.12.148.239
159	10.12.148.240/29	10.12.148.241 – 10.12.148.246	10.12.148.247
160	10.12.148.248/29	10.12.148.249 – 10.12.148.254	10.12.148.255
161	10.12.149.0/29	10.12.149.1 – 10.12.149.6	10.12.149.7
162	10.12.149.8/29	10.12.149.9 – 10.12.149.14	10.12.149.15
163	10.12.149.16/29	10.12.149.17 – 10.12.149.22	10.12.149.23
164	10.12.149.24/29	10.12.149.25 – 10.12.149.30	10.12.149.31
165	10.12.149.32/29	10.12.149.33 – 10.12.149.38	10.12.149.39
166	10.12.149.40/29	10.12.149.41 – 10.12.149.46	10.12.149.47
167	10.12.149.48/29	10.12.149.49 – 10.12.149.54	10.12.149.55
168	10.12.149.56/29	10.12.149.57 – 10.12.149.62	10.12.149.63
169	10.12.149.64/29	10.12.149.65 – 10.12.149.70	10.12.149.71
170	10.12.149.72/29	10.12.149.73 – 10.12.149.78	10.12.149.79
171	10.12.149.80/29	10.12.149.81 – 10.12.149.86	10.12.149.87
172	10.12.149.88/29	10.12.149.89 – 10.12.149.94	10.12.149.95
173	10.12.149.96/29	10.12.149.97 – 10.12.149.102	10.12.149.103
174	10.12.149.104/29	10.12.149.105 – 10.12.149.110	10.12.149.111
175	10.12.149.112/29	10.12.149.113 – 10.12.149.118	10.12.149.119
176	10.12.149.120/29	10.12.149.121 – 10.12.149.126	10.12.149.127
177	10.12.149.128/29	10.12.149.129 – 10.12.149.134	10.12.149.135
178	10.12.149.136/29	10.12.149.137 – 10.12.149.142	10.12.149.143
179	10.12.149.144/29	10.12.149.145 – 10.12.149.150	10.12.149.151
180	10.12.149.152/29	10.12.149.153 – 10.12.149.158	10.12.149.159
181	10.12.149.160/29	10.12.149.161 – 10.12.149.166	10.12.149.167
182	10.12.149.168/29	10.12.149.169 – 10.12.149.174	10.12.149.175
183	10.12.149.176/29	10.12.149.177 – 10.12.149.182	10.12.149.183
184	10.12.149.184/29	10.12.149.185 – 10.12.149.190	10.12.149.191
185	10.12.149.192/29	10.12.149.193 – 10.12.149.198	10.12.149.199
186	10.12.149.200/29	10.12.149.201 – 10.12.149.206	10.12.149.207
187	10.12.149.208/29	10.12.149.209 – 10.12.149.214	10.12.149.215
188	10.12.149.216/29	10.12.149.217 – 10.12.149.222	10.12.149.223
189	10.12.149.224/29	10.12.149.225 – 10.12.149.230	10.12.149.231
190	10.12.149.232/29	10.12.149.233 – 10.12.149.238	10.12.149.239
191	10.12.149.240/29	10.12.149.241 – 10.12.149.246	10.12.149.247
192	10.12.149.248/29	10.12.149.249 – 10.12.149.254	10.12.149.255
193	10.12.150.0/29	10.12.150.1 – 10.12.150.6	10.12.150.7
194	10.12.150.8/29	10.12.150.9 – 10.12.150.14	10.12.150.15
195	10.12.150.16/29	10.12.150.17 – 10.12.150.22	10.12.150.23
196	10.12.150.24/29	10.12.150.25 – 10.12.150.30	10.12.150.31
197	10.12.150.32/29	10.12.150.33 – 10.12.150.38	10.12.150.39
198	10.12.150.40/29	10.12.150.41 – 10.12.150.46	10.12.150.47
199	10.12.150.48/29	10.12.150.49 – 10.12.150.54	10.12.150.55
200	10.12.150.56/29	10.12.150.57 – 10.12.150.62	10.12.150.63
201	10.12.150.64/29	10.12.150.65 – 10.12.150.70	10.12.150.71
202	10.12.150.72/29	10.12.150.73 – 10.12.150.78	10.12.150.79
203	10.12.150.80/29	10.12.150.81 – 10.12.150.86	10.12.150.87
204	10.12.150.88/29	10.12.150.89 – 10.12.150.94	10.12.150.95
205	10.12.150.96/29	10.12.150.97 – 10.12.150.102	10.12.150.103
206	10.12.150.104/29	10.12.150.105 – 10.12.150.110	10.12.150.111
207	10.12.150.112/29	10.12.150.113 – 10.12.150.118	10.12.150.119
208	10.12.150.120/29	10.12.150.121 – 10.12.150.126	10.12.150.127
209	10.12.150.128/29	10.12.150.129 – 10.12.150.134	10.12.150.135
210	10.12.150.136/29	10.12.150.137 – 10.12.150.142	10.12.150.143
211	10.12.150.144/29	10.12.150.145 – 10.12.150.150	10.12.150.151
212	10.12.150.152/29	10.12.150.153 – 10.12.150.158	10.12.150.159
213	10.12.150.160/29	10.12.150.161 – 10.12.150.166	10.12.150.167
214	10.12.150.168/29	10.12.150.169 – 10.12.150.174	10.12.150.175
215	10.12.150.176/29	10.12.150.177 – 10.12.150.182	10.12.150.183
216	10.12.150.184/29	10.12.150.185 – 10.12.150.190	10.12.150.191
217	10.12.150.192/29	10.12.150.193 – 10.12.150.198	10.12.150.199
218	10.12.150.200/29	10.12.150.201 – 10.12.150.206	10.12.150.207
219	10.12.150.208/29	10.12.150.209 – 10.12.150.214	10.12.150.215
220	10.12.150.216/29	10.12.150.217 – 10.12.150.222	10.12.150.223
221	10.12.150.224/29	10.12.150.225 – 10.12.150.230	10.12.150.231
222	10.12.150.232/29	10.12.150.233 – 10.12.150.238	10.12.150.239
223	10.12.150.240/29	10.12.150.241 – 10.12.150.246	10.12.150.247
224	10.12.150.248/29	10.12.150.249 – 10.12.150.254	10.12.150.255
225	10.12.151.0/29	10.12.151.1 – 10.12.151.6	10.12.151.7
226	10.12.151.8/29	10.12.151.9 – 10.12.151.14	10.12.151.15
227	10.12.151.16/29	10.12.151.17 – 10.12.151.22	10.12.151.23
228	10.12.151.24/29	10.12.151.25 – 10.12.151.30	10.12.151.31
229	10.12.151.32/29	10.12.151.33 – 10.12.151.38	10.12.151.39
230	10.12.151.40/29	10.12.151.41 – 10.12.151.46	10.12.151.47
231	10.12.151.48/29	10.12.151.49 – 10.12.151.54	10.12.151.55
232	10.12.151.56/29	10.12.151.57 – 10.12.151.62	10.12.151.63
233	10.12.151.64/29	10.12.151.65 – 10.12.151.70	10.12.151.71
234	10.12.151.72/29	10.12.151.73 – 10.12.151.78	10.12.151.79
235	10.12.151.80/29	10.12.151.81 – 10.12.151.86	10.12.151.87
236	10.12.151.88/29	10.12.151.89 – 10.12.151.94	10.12.151.95
237	10.12.151.96/29	10.12.151.97 – 10.12.151.102	10.12.151.103
238	10.12.151.104/29	10.12.151.105 – 10.12.151.110	10.12.151.111
239	10.12.151.112/29	10.12.151.113 – 10.12.151.118	10.12.151.119
240	10.12.151.120/29	10.12.151.121 – 10.12.151.126	10.12.151.127
241	10.12.151.128/29	10.12.151.129 – 10.12.151.134	10.12.151.135
242	10.12.151.136/29	10.12.151.137 – 10.12.151.142	10.12.151.143
243	10.12.151.144/29	10.12.151.145 – 10.12.151.150	10.12.151.151
244	10.12.151.152/29	10.12.151.153 – 10.12.151.158	10.12.151.159
245	10.12.151.160/29	10.12.151.161 – 10.12.151.166	10.12.151.167
246	10.12.151.168/29	10.12.151.169 – 10.12.151.174	10.12.151.175
247	10.12.151.176/29	10.12.151.177 – 10.12.151.182	10.12.151.183
248	10.12.151.184/29	10.12.151.185 – 10.12.151.190	10.12.151.191
249	10.12.151.192/29	10.12.151.193 – 10.12.151.198	10.12.151.199
250	10.12.151.200/29	10.12.151.201 – 10.12.151.206	10.12.151.207
251	10.12.151.208/29	10.12.151.209 – 10.12.151.214	10.12.151.215
252	10.12.151.216/29	10.12.151.217 – 10.12.151.222	10.12.151.223
253	10.12.151.224/29	10.12.151.225 – 10.12.151.230	10.12.151.231
254	10.12.151.232/29	10.12.151.233 – 10.12.151.238	10.12.151.239
255	10.12.151.240/29	10.12.151.241 – 10.12.151.246	10.12.151.247
256	10.12.151.248/29	10.12.151.249 – 10.12.151.254	10.12.151.255

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 →