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)10.12.48.0/20

network10.12.48.0/20

broadcast10.12.63.255

first host10.12.48.1

last host10.12.63.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.12.48.0/20

address00001010.00001100.00110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001100.00110000.00000000

broadcast00001010.00001100.00111111.11111111

green = network part, grey = host part

hex0x0a0c3000

decimal168570880

reverse dns0.48.12.10.in-addr.arpa

ipv4-mapped::ffff:a0c:3000

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	10.12.48.0/29	10.12.48.1 – 10.12.48.6	10.12.48.7
2	10.12.48.8/29	10.12.48.9 – 10.12.48.14	10.12.48.15
3	10.12.48.16/29	10.12.48.17 – 10.12.48.22	10.12.48.23
4	10.12.48.24/29	10.12.48.25 – 10.12.48.30	10.12.48.31
5	10.12.48.32/29	10.12.48.33 – 10.12.48.38	10.12.48.39
6	10.12.48.40/29	10.12.48.41 – 10.12.48.46	10.12.48.47
7	10.12.48.48/29	10.12.48.49 – 10.12.48.54	10.12.48.55
8	10.12.48.56/29	10.12.48.57 – 10.12.48.62	10.12.48.63
9	10.12.48.64/29	10.12.48.65 – 10.12.48.70	10.12.48.71
10	10.12.48.72/29	10.12.48.73 – 10.12.48.78	10.12.48.79
11	10.12.48.80/29	10.12.48.81 – 10.12.48.86	10.12.48.87
12	10.12.48.88/29	10.12.48.89 – 10.12.48.94	10.12.48.95
13	10.12.48.96/29	10.12.48.97 – 10.12.48.102	10.12.48.103
14	10.12.48.104/29	10.12.48.105 – 10.12.48.110	10.12.48.111
15	10.12.48.112/29	10.12.48.113 – 10.12.48.118	10.12.48.119
16	10.12.48.120/29	10.12.48.121 – 10.12.48.126	10.12.48.127
17	10.12.48.128/29	10.12.48.129 – 10.12.48.134	10.12.48.135
18	10.12.48.136/29	10.12.48.137 – 10.12.48.142	10.12.48.143
19	10.12.48.144/29	10.12.48.145 – 10.12.48.150	10.12.48.151
20	10.12.48.152/29	10.12.48.153 – 10.12.48.158	10.12.48.159
21	10.12.48.160/29	10.12.48.161 – 10.12.48.166	10.12.48.167
22	10.12.48.168/29	10.12.48.169 – 10.12.48.174	10.12.48.175
23	10.12.48.176/29	10.12.48.177 – 10.12.48.182	10.12.48.183
24	10.12.48.184/29	10.12.48.185 – 10.12.48.190	10.12.48.191
25	10.12.48.192/29	10.12.48.193 – 10.12.48.198	10.12.48.199
26	10.12.48.200/29	10.12.48.201 – 10.12.48.206	10.12.48.207
27	10.12.48.208/29	10.12.48.209 – 10.12.48.214	10.12.48.215
28	10.12.48.216/29	10.12.48.217 – 10.12.48.222	10.12.48.223
29	10.12.48.224/29	10.12.48.225 – 10.12.48.230	10.12.48.231
30	10.12.48.232/29	10.12.48.233 – 10.12.48.238	10.12.48.239
31	10.12.48.240/29	10.12.48.241 – 10.12.48.246	10.12.48.247
32	10.12.48.248/29	10.12.48.249 – 10.12.48.254	10.12.48.255
33	10.12.49.0/29	10.12.49.1 – 10.12.49.6	10.12.49.7
34	10.12.49.8/29	10.12.49.9 – 10.12.49.14	10.12.49.15
35	10.12.49.16/29	10.12.49.17 – 10.12.49.22	10.12.49.23
36	10.12.49.24/29	10.12.49.25 – 10.12.49.30	10.12.49.31
37	10.12.49.32/29	10.12.49.33 – 10.12.49.38	10.12.49.39
38	10.12.49.40/29	10.12.49.41 – 10.12.49.46	10.12.49.47
39	10.12.49.48/29	10.12.49.49 – 10.12.49.54	10.12.49.55
40	10.12.49.56/29	10.12.49.57 – 10.12.49.62	10.12.49.63
41	10.12.49.64/29	10.12.49.65 – 10.12.49.70	10.12.49.71
42	10.12.49.72/29	10.12.49.73 – 10.12.49.78	10.12.49.79
43	10.12.49.80/29	10.12.49.81 – 10.12.49.86	10.12.49.87
44	10.12.49.88/29	10.12.49.89 – 10.12.49.94	10.12.49.95
45	10.12.49.96/29	10.12.49.97 – 10.12.49.102	10.12.49.103
46	10.12.49.104/29	10.12.49.105 – 10.12.49.110	10.12.49.111
47	10.12.49.112/29	10.12.49.113 – 10.12.49.118	10.12.49.119
48	10.12.49.120/29	10.12.49.121 – 10.12.49.126	10.12.49.127
49	10.12.49.128/29	10.12.49.129 – 10.12.49.134	10.12.49.135
50	10.12.49.136/29	10.12.49.137 – 10.12.49.142	10.12.49.143
51	10.12.49.144/29	10.12.49.145 – 10.12.49.150	10.12.49.151
52	10.12.49.152/29	10.12.49.153 – 10.12.49.158	10.12.49.159
53	10.12.49.160/29	10.12.49.161 – 10.12.49.166	10.12.49.167
54	10.12.49.168/29	10.12.49.169 – 10.12.49.174	10.12.49.175
55	10.12.49.176/29	10.12.49.177 – 10.12.49.182	10.12.49.183
56	10.12.49.184/29	10.12.49.185 – 10.12.49.190	10.12.49.191
57	10.12.49.192/29	10.12.49.193 – 10.12.49.198	10.12.49.199
58	10.12.49.200/29	10.12.49.201 – 10.12.49.206	10.12.49.207
59	10.12.49.208/29	10.12.49.209 – 10.12.49.214	10.12.49.215
60	10.12.49.216/29	10.12.49.217 – 10.12.49.222	10.12.49.223
61	10.12.49.224/29	10.12.49.225 – 10.12.49.230	10.12.49.231
62	10.12.49.232/29	10.12.49.233 – 10.12.49.238	10.12.49.239
63	10.12.49.240/29	10.12.49.241 – 10.12.49.246	10.12.49.247
64	10.12.49.248/29	10.12.49.249 – 10.12.49.254	10.12.49.255
65	10.12.50.0/29	10.12.50.1 – 10.12.50.6	10.12.50.7
66	10.12.50.8/29	10.12.50.9 – 10.12.50.14	10.12.50.15
67	10.12.50.16/29	10.12.50.17 – 10.12.50.22	10.12.50.23
68	10.12.50.24/29	10.12.50.25 – 10.12.50.30	10.12.50.31
69	10.12.50.32/29	10.12.50.33 – 10.12.50.38	10.12.50.39
70	10.12.50.40/29	10.12.50.41 – 10.12.50.46	10.12.50.47
71	10.12.50.48/29	10.12.50.49 – 10.12.50.54	10.12.50.55
72	10.12.50.56/29	10.12.50.57 – 10.12.50.62	10.12.50.63
73	10.12.50.64/29	10.12.50.65 – 10.12.50.70	10.12.50.71
74	10.12.50.72/29	10.12.50.73 – 10.12.50.78	10.12.50.79
75	10.12.50.80/29	10.12.50.81 – 10.12.50.86	10.12.50.87
76	10.12.50.88/29	10.12.50.89 – 10.12.50.94	10.12.50.95
77	10.12.50.96/29	10.12.50.97 – 10.12.50.102	10.12.50.103
78	10.12.50.104/29	10.12.50.105 – 10.12.50.110	10.12.50.111
79	10.12.50.112/29	10.12.50.113 – 10.12.50.118	10.12.50.119
80	10.12.50.120/29	10.12.50.121 – 10.12.50.126	10.12.50.127
81	10.12.50.128/29	10.12.50.129 – 10.12.50.134	10.12.50.135
82	10.12.50.136/29	10.12.50.137 – 10.12.50.142	10.12.50.143
83	10.12.50.144/29	10.12.50.145 – 10.12.50.150	10.12.50.151
84	10.12.50.152/29	10.12.50.153 – 10.12.50.158	10.12.50.159
85	10.12.50.160/29	10.12.50.161 – 10.12.50.166	10.12.50.167
86	10.12.50.168/29	10.12.50.169 – 10.12.50.174	10.12.50.175
87	10.12.50.176/29	10.12.50.177 – 10.12.50.182	10.12.50.183
88	10.12.50.184/29	10.12.50.185 – 10.12.50.190	10.12.50.191
89	10.12.50.192/29	10.12.50.193 – 10.12.50.198	10.12.50.199
90	10.12.50.200/29	10.12.50.201 – 10.12.50.206	10.12.50.207
91	10.12.50.208/29	10.12.50.209 – 10.12.50.214	10.12.50.215
92	10.12.50.216/29	10.12.50.217 – 10.12.50.222	10.12.50.223
93	10.12.50.224/29	10.12.50.225 – 10.12.50.230	10.12.50.231
94	10.12.50.232/29	10.12.50.233 – 10.12.50.238	10.12.50.239
95	10.12.50.240/29	10.12.50.241 – 10.12.50.246	10.12.50.247
96	10.12.50.248/29	10.12.50.249 – 10.12.50.254	10.12.50.255
97	10.12.51.0/29	10.12.51.1 – 10.12.51.6	10.12.51.7
98	10.12.51.8/29	10.12.51.9 – 10.12.51.14	10.12.51.15
99	10.12.51.16/29	10.12.51.17 – 10.12.51.22	10.12.51.23
100	10.12.51.24/29	10.12.51.25 – 10.12.51.30	10.12.51.31
101	10.12.51.32/29	10.12.51.33 – 10.12.51.38	10.12.51.39
102	10.12.51.40/29	10.12.51.41 – 10.12.51.46	10.12.51.47
103	10.12.51.48/29	10.12.51.49 – 10.12.51.54	10.12.51.55
104	10.12.51.56/29	10.12.51.57 – 10.12.51.62	10.12.51.63
105	10.12.51.64/29	10.12.51.65 – 10.12.51.70	10.12.51.71
106	10.12.51.72/29	10.12.51.73 – 10.12.51.78	10.12.51.79
107	10.12.51.80/29	10.12.51.81 – 10.12.51.86	10.12.51.87
108	10.12.51.88/29	10.12.51.89 – 10.12.51.94	10.12.51.95
109	10.12.51.96/29	10.12.51.97 – 10.12.51.102	10.12.51.103
110	10.12.51.104/29	10.12.51.105 – 10.12.51.110	10.12.51.111
111	10.12.51.112/29	10.12.51.113 – 10.12.51.118	10.12.51.119
112	10.12.51.120/29	10.12.51.121 – 10.12.51.126	10.12.51.127
113	10.12.51.128/29	10.12.51.129 – 10.12.51.134	10.12.51.135
114	10.12.51.136/29	10.12.51.137 – 10.12.51.142	10.12.51.143
115	10.12.51.144/29	10.12.51.145 – 10.12.51.150	10.12.51.151
116	10.12.51.152/29	10.12.51.153 – 10.12.51.158	10.12.51.159
117	10.12.51.160/29	10.12.51.161 – 10.12.51.166	10.12.51.167
118	10.12.51.168/29	10.12.51.169 – 10.12.51.174	10.12.51.175
119	10.12.51.176/29	10.12.51.177 – 10.12.51.182	10.12.51.183
120	10.12.51.184/29	10.12.51.185 – 10.12.51.190	10.12.51.191
121	10.12.51.192/29	10.12.51.193 – 10.12.51.198	10.12.51.199
122	10.12.51.200/29	10.12.51.201 – 10.12.51.206	10.12.51.207
123	10.12.51.208/29	10.12.51.209 – 10.12.51.214	10.12.51.215
124	10.12.51.216/29	10.12.51.217 – 10.12.51.222	10.12.51.223
125	10.12.51.224/29	10.12.51.225 – 10.12.51.230	10.12.51.231
126	10.12.51.232/29	10.12.51.233 – 10.12.51.238	10.12.51.239
127	10.12.51.240/29	10.12.51.241 – 10.12.51.246	10.12.51.247
128	10.12.51.248/29	10.12.51.249 – 10.12.51.254	10.12.51.255
129	10.12.52.0/29	10.12.52.1 – 10.12.52.6	10.12.52.7
130	10.12.52.8/29	10.12.52.9 – 10.12.52.14	10.12.52.15
131	10.12.52.16/29	10.12.52.17 – 10.12.52.22	10.12.52.23
132	10.12.52.24/29	10.12.52.25 – 10.12.52.30	10.12.52.31
133	10.12.52.32/29	10.12.52.33 – 10.12.52.38	10.12.52.39
134	10.12.52.40/29	10.12.52.41 – 10.12.52.46	10.12.52.47
135	10.12.52.48/29	10.12.52.49 – 10.12.52.54	10.12.52.55
136	10.12.52.56/29	10.12.52.57 – 10.12.52.62	10.12.52.63
137	10.12.52.64/29	10.12.52.65 – 10.12.52.70	10.12.52.71
138	10.12.52.72/29	10.12.52.73 – 10.12.52.78	10.12.52.79
139	10.12.52.80/29	10.12.52.81 – 10.12.52.86	10.12.52.87
140	10.12.52.88/29	10.12.52.89 – 10.12.52.94	10.12.52.95
141	10.12.52.96/29	10.12.52.97 – 10.12.52.102	10.12.52.103
142	10.12.52.104/29	10.12.52.105 – 10.12.52.110	10.12.52.111
143	10.12.52.112/29	10.12.52.113 – 10.12.52.118	10.12.52.119
144	10.12.52.120/29	10.12.52.121 – 10.12.52.126	10.12.52.127
145	10.12.52.128/29	10.12.52.129 – 10.12.52.134	10.12.52.135
146	10.12.52.136/29	10.12.52.137 – 10.12.52.142	10.12.52.143
147	10.12.52.144/29	10.12.52.145 – 10.12.52.150	10.12.52.151
148	10.12.52.152/29	10.12.52.153 – 10.12.52.158	10.12.52.159
149	10.12.52.160/29	10.12.52.161 – 10.12.52.166	10.12.52.167
150	10.12.52.168/29	10.12.52.169 – 10.12.52.174	10.12.52.175
151	10.12.52.176/29	10.12.52.177 – 10.12.52.182	10.12.52.183
152	10.12.52.184/29	10.12.52.185 – 10.12.52.190	10.12.52.191
153	10.12.52.192/29	10.12.52.193 – 10.12.52.198	10.12.52.199
154	10.12.52.200/29	10.12.52.201 – 10.12.52.206	10.12.52.207
155	10.12.52.208/29	10.12.52.209 – 10.12.52.214	10.12.52.215
156	10.12.52.216/29	10.12.52.217 – 10.12.52.222	10.12.52.223
157	10.12.52.224/29	10.12.52.225 – 10.12.52.230	10.12.52.231
158	10.12.52.232/29	10.12.52.233 – 10.12.52.238	10.12.52.239
159	10.12.52.240/29	10.12.52.241 – 10.12.52.246	10.12.52.247
160	10.12.52.248/29	10.12.52.249 – 10.12.52.254	10.12.52.255
161	10.12.53.0/29	10.12.53.1 – 10.12.53.6	10.12.53.7
162	10.12.53.8/29	10.12.53.9 – 10.12.53.14	10.12.53.15
163	10.12.53.16/29	10.12.53.17 – 10.12.53.22	10.12.53.23
164	10.12.53.24/29	10.12.53.25 – 10.12.53.30	10.12.53.31
165	10.12.53.32/29	10.12.53.33 – 10.12.53.38	10.12.53.39
166	10.12.53.40/29	10.12.53.41 – 10.12.53.46	10.12.53.47
167	10.12.53.48/29	10.12.53.49 – 10.12.53.54	10.12.53.55
168	10.12.53.56/29	10.12.53.57 – 10.12.53.62	10.12.53.63
169	10.12.53.64/29	10.12.53.65 – 10.12.53.70	10.12.53.71
170	10.12.53.72/29	10.12.53.73 – 10.12.53.78	10.12.53.79
171	10.12.53.80/29	10.12.53.81 – 10.12.53.86	10.12.53.87
172	10.12.53.88/29	10.12.53.89 – 10.12.53.94	10.12.53.95
173	10.12.53.96/29	10.12.53.97 – 10.12.53.102	10.12.53.103
174	10.12.53.104/29	10.12.53.105 – 10.12.53.110	10.12.53.111
175	10.12.53.112/29	10.12.53.113 – 10.12.53.118	10.12.53.119
176	10.12.53.120/29	10.12.53.121 – 10.12.53.126	10.12.53.127
177	10.12.53.128/29	10.12.53.129 – 10.12.53.134	10.12.53.135
178	10.12.53.136/29	10.12.53.137 – 10.12.53.142	10.12.53.143
179	10.12.53.144/29	10.12.53.145 – 10.12.53.150	10.12.53.151
180	10.12.53.152/29	10.12.53.153 – 10.12.53.158	10.12.53.159
181	10.12.53.160/29	10.12.53.161 – 10.12.53.166	10.12.53.167
182	10.12.53.168/29	10.12.53.169 – 10.12.53.174	10.12.53.175
183	10.12.53.176/29	10.12.53.177 – 10.12.53.182	10.12.53.183
184	10.12.53.184/29	10.12.53.185 – 10.12.53.190	10.12.53.191
185	10.12.53.192/29	10.12.53.193 – 10.12.53.198	10.12.53.199
186	10.12.53.200/29	10.12.53.201 – 10.12.53.206	10.12.53.207
187	10.12.53.208/29	10.12.53.209 – 10.12.53.214	10.12.53.215
188	10.12.53.216/29	10.12.53.217 – 10.12.53.222	10.12.53.223
189	10.12.53.224/29	10.12.53.225 – 10.12.53.230	10.12.53.231
190	10.12.53.232/29	10.12.53.233 – 10.12.53.238	10.12.53.239
191	10.12.53.240/29	10.12.53.241 – 10.12.53.246	10.12.53.247
192	10.12.53.248/29	10.12.53.249 – 10.12.53.254	10.12.53.255
193	10.12.54.0/29	10.12.54.1 – 10.12.54.6	10.12.54.7
194	10.12.54.8/29	10.12.54.9 – 10.12.54.14	10.12.54.15
195	10.12.54.16/29	10.12.54.17 – 10.12.54.22	10.12.54.23
196	10.12.54.24/29	10.12.54.25 – 10.12.54.30	10.12.54.31
197	10.12.54.32/29	10.12.54.33 – 10.12.54.38	10.12.54.39
198	10.12.54.40/29	10.12.54.41 – 10.12.54.46	10.12.54.47
199	10.12.54.48/29	10.12.54.49 – 10.12.54.54	10.12.54.55
200	10.12.54.56/29	10.12.54.57 – 10.12.54.62	10.12.54.63
201	10.12.54.64/29	10.12.54.65 – 10.12.54.70	10.12.54.71
202	10.12.54.72/29	10.12.54.73 – 10.12.54.78	10.12.54.79
203	10.12.54.80/29	10.12.54.81 – 10.12.54.86	10.12.54.87
204	10.12.54.88/29	10.12.54.89 – 10.12.54.94	10.12.54.95
205	10.12.54.96/29	10.12.54.97 – 10.12.54.102	10.12.54.103
206	10.12.54.104/29	10.12.54.105 – 10.12.54.110	10.12.54.111
207	10.12.54.112/29	10.12.54.113 – 10.12.54.118	10.12.54.119
208	10.12.54.120/29	10.12.54.121 – 10.12.54.126	10.12.54.127
209	10.12.54.128/29	10.12.54.129 – 10.12.54.134	10.12.54.135
210	10.12.54.136/29	10.12.54.137 – 10.12.54.142	10.12.54.143
211	10.12.54.144/29	10.12.54.145 – 10.12.54.150	10.12.54.151
212	10.12.54.152/29	10.12.54.153 – 10.12.54.158	10.12.54.159
213	10.12.54.160/29	10.12.54.161 – 10.12.54.166	10.12.54.167
214	10.12.54.168/29	10.12.54.169 – 10.12.54.174	10.12.54.175
215	10.12.54.176/29	10.12.54.177 – 10.12.54.182	10.12.54.183
216	10.12.54.184/29	10.12.54.185 – 10.12.54.190	10.12.54.191
217	10.12.54.192/29	10.12.54.193 – 10.12.54.198	10.12.54.199
218	10.12.54.200/29	10.12.54.201 – 10.12.54.206	10.12.54.207
219	10.12.54.208/29	10.12.54.209 – 10.12.54.214	10.12.54.215
220	10.12.54.216/29	10.12.54.217 – 10.12.54.222	10.12.54.223
221	10.12.54.224/29	10.12.54.225 – 10.12.54.230	10.12.54.231
222	10.12.54.232/29	10.12.54.233 – 10.12.54.238	10.12.54.239
223	10.12.54.240/29	10.12.54.241 – 10.12.54.246	10.12.54.247
224	10.12.54.248/29	10.12.54.249 – 10.12.54.254	10.12.54.255
225	10.12.55.0/29	10.12.55.1 – 10.12.55.6	10.12.55.7
226	10.12.55.8/29	10.12.55.9 – 10.12.55.14	10.12.55.15
227	10.12.55.16/29	10.12.55.17 – 10.12.55.22	10.12.55.23
228	10.12.55.24/29	10.12.55.25 – 10.12.55.30	10.12.55.31
229	10.12.55.32/29	10.12.55.33 – 10.12.55.38	10.12.55.39
230	10.12.55.40/29	10.12.55.41 – 10.12.55.46	10.12.55.47
231	10.12.55.48/29	10.12.55.49 – 10.12.55.54	10.12.55.55
232	10.12.55.56/29	10.12.55.57 – 10.12.55.62	10.12.55.63
233	10.12.55.64/29	10.12.55.65 – 10.12.55.70	10.12.55.71
234	10.12.55.72/29	10.12.55.73 – 10.12.55.78	10.12.55.79
235	10.12.55.80/29	10.12.55.81 – 10.12.55.86	10.12.55.87
236	10.12.55.88/29	10.12.55.89 – 10.12.55.94	10.12.55.95
237	10.12.55.96/29	10.12.55.97 – 10.12.55.102	10.12.55.103
238	10.12.55.104/29	10.12.55.105 – 10.12.55.110	10.12.55.111
239	10.12.55.112/29	10.12.55.113 – 10.12.55.118	10.12.55.119
240	10.12.55.120/29	10.12.55.121 – 10.12.55.126	10.12.55.127
241	10.12.55.128/29	10.12.55.129 – 10.12.55.134	10.12.55.135
242	10.12.55.136/29	10.12.55.137 – 10.12.55.142	10.12.55.143
243	10.12.55.144/29	10.12.55.145 – 10.12.55.150	10.12.55.151
244	10.12.55.152/29	10.12.55.153 – 10.12.55.158	10.12.55.159
245	10.12.55.160/29	10.12.55.161 – 10.12.55.166	10.12.55.167
246	10.12.55.168/29	10.12.55.169 – 10.12.55.174	10.12.55.175
247	10.12.55.176/29	10.12.55.177 – 10.12.55.182	10.12.55.183
248	10.12.55.184/29	10.12.55.185 – 10.12.55.190	10.12.55.191
249	10.12.55.192/29	10.12.55.193 – 10.12.55.198	10.12.55.199
250	10.12.55.200/29	10.12.55.201 – 10.12.55.206	10.12.55.207
251	10.12.55.208/29	10.12.55.209 – 10.12.55.214	10.12.55.215
252	10.12.55.216/29	10.12.55.217 – 10.12.55.222	10.12.55.223
253	10.12.55.224/29	10.12.55.225 – 10.12.55.230	10.12.55.231
254	10.12.55.232/29	10.12.55.233 – 10.12.55.238	10.12.55.239
255	10.12.55.240/29	10.12.55.241 – 10.12.55.246	10.12.55.247
256	10.12.55.248/29	10.12.55.249 – 10.12.55.254	10.12.55.255

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 →