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)10.17.128.0/18

network10.17.128.0/18

broadcast10.17.191.255

first host10.17.128.1

last host10.17.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.17.128.0/18

address00001010.00010001.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00010001.10000000.00000000

broadcast00001010.00010001.10111111.11111111

green = network part, grey = host part

hex0x0a118000

decimal168919040

reverse dns0.128.17.10.in-addr.arpa

ipv4-mapped::ffff:a11:8000

/18 split into /29 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.17.128.0/29	10.17.128.1 – 10.17.128.6	10.17.128.7
2	10.17.128.8/29	10.17.128.9 – 10.17.128.14	10.17.128.15
3	10.17.128.16/29	10.17.128.17 – 10.17.128.22	10.17.128.23
4	10.17.128.24/29	10.17.128.25 – 10.17.128.30	10.17.128.31
5	10.17.128.32/29	10.17.128.33 – 10.17.128.38	10.17.128.39
6	10.17.128.40/29	10.17.128.41 – 10.17.128.46	10.17.128.47
7	10.17.128.48/29	10.17.128.49 – 10.17.128.54	10.17.128.55
8	10.17.128.56/29	10.17.128.57 – 10.17.128.62	10.17.128.63
9	10.17.128.64/29	10.17.128.65 – 10.17.128.70	10.17.128.71
10	10.17.128.72/29	10.17.128.73 – 10.17.128.78	10.17.128.79
11	10.17.128.80/29	10.17.128.81 – 10.17.128.86	10.17.128.87
12	10.17.128.88/29	10.17.128.89 – 10.17.128.94	10.17.128.95
13	10.17.128.96/29	10.17.128.97 – 10.17.128.102	10.17.128.103
14	10.17.128.104/29	10.17.128.105 – 10.17.128.110	10.17.128.111
15	10.17.128.112/29	10.17.128.113 – 10.17.128.118	10.17.128.119
16	10.17.128.120/29	10.17.128.121 – 10.17.128.126	10.17.128.127
17	10.17.128.128/29	10.17.128.129 – 10.17.128.134	10.17.128.135
18	10.17.128.136/29	10.17.128.137 – 10.17.128.142	10.17.128.143
19	10.17.128.144/29	10.17.128.145 – 10.17.128.150	10.17.128.151
20	10.17.128.152/29	10.17.128.153 – 10.17.128.158	10.17.128.159
21	10.17.128.160/29	10.17.128.161 – 10.17.128.166	10.17.128.167
22	10.17.128.168/29	10.17.128.169 – 10.17.128.174	10.17.128.175
23	10.17.128.176/29	10.17.128.177 – 10.17.128.182	10.17.128.183
24	10.17.128.184/29	10.17.128.185 – 10.17.128.190	10.17.128.191
25	10.17.128.192/29	10.17.128.193 – 10.17.128.198	10.17.128.199
26	10.17.128.200/29	10.17.128.201 – 10.17.128.206	10.17.128.207
27	10.17.128.208/29	10.17.128.209 – 10.17.128.214	10.17.128.215
28	10.17.128.216/29	10.17.128.217 – 10.17.128.222	10.17.128.223
29	10.17.128.224/29	10.17.128.225 – 10.17.128.230	10.17.128.231
30	10.17.128.232/29	10.17.128.233 – 10.17.128.238	10.17.128.239
31	10.17.128.240/29	10.17.128.241 – 10.17.128.246	10.17.128.247
32	10.17.128.248/29	10.17.128.249 – 10.17.128.254	10.17.128.255
33	10.17.129.0/29	10.17.129.1 – 10.17.129.6	10.17.129.7
34	10.17.129.8/29	10.17.129.9 – 10.17.129.14	10.17.129.15
35	10.17.129.16/29	10.17.129.17 – 10.17.129.22	10.17.129.23
36	10.17.129.24/29	10.17.129.25 – 10.17.129.30	10.17.129.31
37	10.17.129.32/29	10.17.129.33 – 10.17.129.38	10.17.129.39
38	10.17.129.40/29	10.17.129.41 – 10.17.129.46	10.17.129.47
39	10.17.129.48/29	10.17.129.49 – 10.17.129.54	10.17.129.55
40	10.17.129.56/29	10.17.129.57 – 10.17.129.62	10.17.129.63
41	10.17.129.64/29	10.17.129.65 – 10.17.129.70	10.17.129.71
42	10.17.129.72/29	10.17.129.73 – 10.17.129.78	10.17.129.79
43	10.17.129.80/29	10.17.129.81 – 10.17.129.86	10.17.129.87
44	10.17.129.88/29	10.17.129.89 – 10.17.129.94	10.17.129.95
45	10.17.129.96/29	10.17.129.97 – 10.17.129.102	10.17.129.103
46	10.17.129.104/29	10.17.129.105 – 10.17.129.110	10.17.129.111
47	10.17.129.112/29	10.17.129.113 – 10.17.129.118	10.17.129.119
48	10.17.129.120/29	10.17.129.121 – 10.17.129.126	10.17.129.127
49	10.17.129.128/29	10.17.129.129 – 10.17.129.134	10.17.129.135
50	10.17.129.136/29	10.17.129.137 – 10.17.129.142	10.17.129.143
51	10.17.129.144/29	10.17.129.145 – 10.17.129.150	10.17.129.151
52	10.17.129.152/29	10.17.129.153 – 10.17.129.158	10.17.129.159
53	10.17.129.160/29	10.17.129.161 – 10.17.129.166	10.17.129.167
54	10.17.129.168/29	10.17.129.169 – 10.17.129.174	10.17.129.175
55	10.17.129.176/29	10.17.129.177 – 10.17.129.182	10.17.129.183
56	10.17.129.184/29	10.17.129.185 – 10.17.129.190	10.17.129.191
57	10.17.129.192/29	10.17.129.193 – 10.17.129.198	10.17.129.199
58	10.17.129.200/29	10.17.129.201 – 10.17.129.206	10.17.129.207
59	10.17.129.208/29	10.17.129.209 – 10.17.129.214	10.17.129.215
60	10.17.129.216/29	10.17.129.217 – 10.17.129.222	10.17.129.223
61	10.17.129.224/29	10.17.129.225 – 10.17.129.230	10.17.129.231
62	10.17.129.232/29	10.17.129.233 – 10.17.129.238	10.17.129.239
63	10.17.129.240/29	10.17.129.241 – 10.17.129.246	10.17.129.247
64	10.17.129.248/29	10.17.129.249 – 10.17.129.254	10.17.129.255
65	10.17.130.0/29	10.17.130.1 – 10.17.130.6	10.17.130.7
66	10.17.130.8/29	10.17.130.9 – 10.17.130.14	10.17.130.15
67	10.17.130.16/29	10.17.130.17 – 10.17.130.22	10.17.130.23
68	10.17.130.24/29	10.17.130.25 – 10.17.130.30	10.17.130.31
69	10.17.130.32/29	10.17.130.33 – 10.17.130.38	10.17.130.39
70	10.17.130.40/29	10.17.130.41 – 10.17.130.46	10.17.130.47
71	10.17.130.48/29	10.17.130.49 – 10.17.130.54	10.17.130.55
72	10.17.130.56/29	10.17.130.57 – 10.17.130.62	10.17.130.63
73	10.17.130.64/29	10.17.130.65 – 10.17.130.70	10.17.130.71
74	10.17.130.72/29	10.17.130.73 – 10.17.130.78	10.17.130.79
75	10.17.130.80/29	10.17.130.81 – 10.17.130.86	10.17.130.87
76	10.17.130.88/29	10.17.130.89 – 10.17.130.94	10.17.130.95
77	10.17.130.96/29	10.17.130.97 – 10.17.130.102	10.17.130.103
78	10.17.130.104/29	10.17.130.105 – 10.17.130.110	10.17.130.111
79	10.17.130.112/29	10.17.130.113 – 10.17.130.118	10.17.130.119
80	10.17.130.120/29	10.17.130.121 – 10.17.130.126	10.17.130.127
81	10.17.130.128/29	10.17.130.129 – 10.17.130.134	10.17.130.135
82	10.17.130.136/29	10.17.130.137 – 10.17.130.142	10.17.130.143
83	10.17.130.144/29	10.17.130.145 – 10.17.130.150	10.17.130.151
84	10.17.130.152/29	10.17.130.153 – 10.17.130.158	10.17.130.159
85	10.17.130.160/29	10.17.130.161 – 10.17.130.166	10.17.130.167
86	10.17.130.168/29	10.17.130.169 – 10.17.130.174	10.17.130.175
87	10.17.130.176/29	10.17.130.177 – 10.17.130.182	10.17.130.183
88	10.17.130.184/29	10.17.130.185 – 10.17.130.190	10.17.130.191
89	10.17.130.192/29	10.17.130.193 – 10.17.130.198	10.17.130.199
90	10.17.130.200/29	10.17.130.201 – 10.17.130.206	10.17.130.207
91	10.17.130.208/29	10.17.130.209 – 10.17.130.214	10.17.130.215
92	10.17.130.216/29	10.17.130.217 – 10.17.130.222	10.17.130.223
93	10.17.130.224/29	10.17.130.225 – 10.17.130.230	10.17.130.231
94	10.17.130.232/29	10.17.130.233 – 10.17.130.238	10.17.130.239
95	10.17.130.240/29	10.17.130.241 – 10.17.130.246	10.17.130.247
96	10.17.130.248/29	10.17.130.249 – 10.17.130.254	10.17.130.255
97	10.17.131.0/29	10.17.131.1 – 10.17.131.6	10.17.131.7
98	10.17.131.8/29	10.17.131.9 – 10.17.131.14	10.17.131.15
99	10.17.131.16/29	10.17.131.17 – 10.17.131.22	10.17.131.23
100	10.17.131.24/29	10.17.131.25 – 10.17.131.30	10.17.131.31
101	10.17.131.32/29	10.17.131.33 – 10.17.131.38	10.17.131.39
102	10.17.131.40/29	10.17.131.41 – 10.17.131.46	10.17.131.47
103	10.17.131.48/29	10.17.131.49 – 10.17.131.54	10.17.131.55
104	10.17.131.56/29	10.17.131.57 – 10.17.131.62	10.17.131.63
105	10.17.131.64/29	10.17.131.65 – 10.17.131.70	10.17.131.71
106	10.17.131.72/29	10.17.131.73 – 10.17.131.78	10.17.131.79
107	10.17.131.80/29	10.17.131.81 – 10.17.131.86	10.17.131.87
108	10.17.131.88/29	10.17.131.89 – 10.17.131.94	10.17.131.95
109	10.17.131.96/29	10.17.131.97 – 10.17.131.102	10.17.131.103
110	10.17.131.104/29	10.17.131.105 – 10.17.131.110	10.17.131.111
111	10.17.131.112/29	10.17.131.113 – 10.17.131.118	10.17.131.119
112	10.17.131.120/29	10.17.131.121 – 10.17.131.126	10.17.131.127
113	10.17.131.128/29	10.17.131.129 – 10.17.131.134	10.17.131.135
114	10.17.131.136/29	10.17.131.137 – 10.17.131.142	10.17.131.143
115	10.17.131.144/29	10.17.131.145 – 10.17.131.150	10.17.131.151
116	10.17.131.152/29	10.17.131.153 – 10.17.131.158	10.17.131.159
117	10.17.131.160/29	10.17.131.161 – 10.17.131.166	10.17.131.167
118	10.17.131.168/29	10.17.131.169 – 10.17.131.174	10.17.131.175
119	10.17.131.176/29	10.17.131.177 – 10.17.131.182	10.17.131.183
120	10.17.131.184/29	10.17.131.185 – 10.17.131.190	10.17.131.191
121	10.17.131.192/29	10.17.131.193 – 10.17.131.198	10.17.131.199
122	10.17.131.200/29	10.17.131.201 – 10.17.131.206	10.17.131.207
123	10.17.131.208/29	10.17.131.209 – 10.17.131.214	10.17.131.215
124	10.17.131.216/29	10.17.131.217 – 10.17.131.222	10.17.131.223
125	10.17.131.224/29	10.17.131.225 – 10.17.131.230	10.17.131.231
126	10.17.131.232/29	10.17.131.233 – 10.17.131.238	10.17.131.239
127	10.17.131.240/29	10.17.131.241 – 10.17.131.246	10.17.131.247
128	10.17.131.248/29	10.17.131.249 – 10.17.131.254	10.17.131.255
129	10.17.132.0/29	10.17.132.1 – 10.17.132.6	10.17.132.7
130	10.17.132.8/29	10.17.132.9 – 10.17.132.14	10.17.132.15
131	10.17.132.16/29	10.17.132.17 – 10.17.132.22	10.17.132.23
132	10.17.132.24/29	10.17.132.25 – 10.17.132.30	10.17.132.31
133	10.17.132.32/29	10.17.132.33 – 10.17.132.38	10.17.132.39
134	10.17.132.40/29	10.17.132.41 – 10.17.132.46	10.17.132.47
135	10.17.132.48/29	10.17.132.49 – 10.17.132.54	10.17.132.55
136	10.17.132.56/29	10.17.132.57 – 10.17.132.62	10.17.132.63
137	10.17.132.64/29	10.17.132.65 – 10.17.132.70	10.17.132.71
138	10.17.132.72/29	10.17.132.73 – 10.17.132.78	10.17.132.79
139	10.17.132.80/29	10.17.132.81 – 10.17.132.86	10.17.132.87
140	10.17.132.88/29	10.17.132.89 – 10.17.132.94	10.17.132.95
141	10.17.132.96/29	10.17.132.97 – 10.17.132.102	10.17.132.103
142	10.17.132.104/29	10.17.132.105 – 10.17.132.110	10.17.132.111
143	10.17.132.112/29	10.17.132.113 – 10.17.132.118	10.17.132.119
144	10.17.132.120/29	10.17.132.121 – 10.17.132.126	10.17.132.127
145	10.17.132.128/29	10.17.132.129 – 10.17.132.134	10.17.132.135
146	10.17.132.136/29	10.17.132.137 – 10.17.132.142	10.17.132.143
147	10.17.132.144/29	10.17.132.145 – 10.17.132.150	10.17.132.151
148	10.17.132.152/29	10.17.132.153 – 10.17.132.158	10.17.132.159
149	10.17.132.160/29	10.17.132.161 – 10.17.132.166	10.17.132.167
150	10.17.132.168/29	10.17.132.169 – 10.17.132.174	10.17.132.175
151	10.17.132.176/29	10.17.132.177 – 10.17.132.182	10.17.132.183
152	10.17.132.184/29	10.17.132.185 – 10.17.132.190	10.17.132.191
153	10.17.132.192/29	10.17.132.193 – 10.17.132.198	10.17.132.199
154	10.17.132.200/29	10.17.132.201 – 10.17.132.206	10.17.132.207
155	10.17.132.208/29	10.17.132.209 – 10.17.132.214	10.17.132.215
156	10.17.132.216/29	10.17.132.217 – 10.17.132.222	10.17.132.223
157	10.17.132.224/29	10.17.132.225 – 10.17.132.230	10.17.132.231
158	10.17.132.232/29	10.17.132.233 – 10.17.132.238	10.17.132.239
159	10.17.132.240/29	10.17.132.241 – 10.17.132.246	10.17.132.247
160	10.17.132.248/29	10.17.132.249 – 10.17.132.254	10.17.132.255
161	10.17.133.0/29	10.17.133.1 – 10.17.133.6	10.17.133.7
162	10.17.133.8/29	10.17.133.9 – 10.17.133.14	10.17.133.15
163	10.17.133.16/29	10.17.133.17 – 10.17.133.22	10.17.133.23
164	10.17.133.24/29	10.17.133.25 – 10.17.133.30	10.17.133.31
165	10.17.133.32/29	10.17.133.33 – 10.17.133.38	10.17.133.39
166	10.17.133.40/29	10.17.133.41 – 10.17.133.46	10.17.133.47
167	10.17.133.48/29	10.17.133.49 – 10.17.133.54	10.17.133.55
168	10.17.133.56/29	10.17.133.57 – 10.17.133.62	10.17.133.63
169	10.17.133.64/29	10.17.133.65 – 10.17.133.70	10.17.133.71
170	10.17.133.72/29	10.17.133.73 – 10.17.133.78	10.17.133.79
171	10.17.133.80/29	10.17.133.81 – 10.17.133.86	10.17.133.87
172	10.17.133.88/29	10.17.133.89 – 10.17.133.94	10.17.133.95
173	10.17.133.96/29	10.17.133.97 – 10.17.133.102	10.17.133.103
174	10.17.133.104/29	10.17.133.105 – 10.17.133.110	10.17.133.111
175	10.17.133.112/29	10.17.133.113 – 10.17.133.118	10.17.133.119
176	10.17.133.120/29	10.17.133.121 – 10.17.133.126	10.17.133.127
177	10.17.133.128/29	10.17.133.129 – 10.17.133.134	10.17.133.135
178	10.17.133.136/29	10.17.133.137 – 10.17.133.142	10.17.133.143
179	10.17.133.144/29	10.17.133.145 – 10.17.133.150	10.17.133.151
180	10.17.133.152/29	10.17.133.153 – 10.17.133.158	10.17.133.159
181	10.17.133.160/29	10.17.133.161 – 10.17.133.166	10.17.133.167
182	10.17.133.168/29	10.17.133.169 – 10.17.133.174	10.17.133.175
183	10.17.133.176/29	10.17.133.177 – 10.17.133.182	10.17.133.183
184	10.17.133.184/29	10.17.133.185 – 10.17.133.190	10.17.133.191
185	10.17.133.192/29	10.17.133.193 – 10.17.133.198	10.17.133.199
186	10.17.133.200/29	10.17.133.201 – 10.17.133.206	10.17.133.207
187	10.17.133.208/29	10.17.133.209 – 10.17.133.214	10.17.133.215
188	10.17.133.216/29	10.17.133.217 – 10.17.133.222	10.17.133.223
189	10.17.133.224/29	10.17.133.225 – 10.17.133.230	10.17.133.231
190	10.17.133.232/29	10.17.133.233 – 10.17.133.238	10.17.133.239
191	10.17.133.240/29	10.17.133.241 – 10.17.133.246	10.17.133.247
192	10.17.133.248/29	10.17.133.249 – 10.17.133.254	10.17.133.255
193	10.17.134.0/29	10.17.134.1 – 10.17.134.6	10.17.134.7
194	10.17.134.8/29	10.17.134.9 – 10.17.134.14	10.17.134.15
195	10.17.134.16/29	10.17.134.17 – 10.17.134.22	10.17.134.23
196	10.17.134.24/29	10.17.134.25 – 10.17.134.30	10.17.134.31
197	10.17.134.32/29	10.17.134.33 – 10.17.134.38	10.17.134.39
198	10.17.134.40/29	10.17.134.41 – 10.17.134.46	10.17.134.47
199	10.17.134.48/29	10.17.134.49 – 10.17.134.54	10.17.134.55
200	10.17.134.56/29	10.17.134.57 – 10.17.134.62	10.17.134.63
201	10.17.134.64/29	10.17.134.65 – 10.17.134.70	10.17.134.71
202	10.17.134.72/29	10.17.134.73 – 10.17.134.78	10.17.134.79
203	10.17.134.80/29	10.17.134.81 – 10.17.134.86	10.17.134.87
204	10.17.134.88/29	10.17.134.89 – 10.17.134.94	10.17.134.95
205	10.17.134.96/29	10.17.134.97 – 10.17.134.102	10.17.134.103
206	10.17.134.104/29	10.17.134.105 – 10.17.134.110	10.17.134.111
207	10.17.134.112/29	10.17.134.113 – 10.17.134.118	10.17.134.119
208	10.17.134.120/29	10.17.134.121 – 10.17.134.126	10.17.134.127
209	10.17.134.128/29	10.17.134.129 – 10.17.134.134	10.17.134.135
210	10.17.134.136/29	10.17.134.137 – 10.17.134.142	10.17.134.143
211	10.17.134.144/29	10.17.134.145 – 10.17.134.150	10.17.134.151
212	10.17.134.152/29	10.17.134.153 – 10.17.134.158	10.17.134.159
213	10.17.134.160/29	10.17.134.161 – 10.17.134.166	10.17.134.167
214	10.17.134.168/29	10.17.134.169 – 10.17.134.174	10.17.134.175
215	10.17.134.176/29	10.17.134.177 – 10.17.134.182	10.17.134.183
216	10.17.134.184/29	10.17.134.185 – 10.17.134.190	10.17.134.191
217	10.17.134.192/29	10.17.134.193 – 10.17.134.198	10.17.134.199
218	10.17.134.200/29	10.17.134.201 – 10.17.134.206	10.17.134.207
219	10.17.134.208/29	10.17.134.209 – 10.17.134.214	10.17.134.215
220	10.17.134.216/29	10.17.134.217 – 10.17.134.222	10.17.134.223
221	10.17.134.224/29	10.17.134.225 – 10.17.134.230	10.17.134.231
222	10.17.134.232/29	10.17.134.233 – 10.17.134.238	10.17.134.239
223	10.17.134.240/29	10.17.134.241 – 10.17.134.246	10.17.134.247
224	10.17.134.248/29	10.17.134.249 – 10.17.134.254	10.17.134.255
225	10.17.135.0/29	10.17.135.1 – 10.17.135.6	10.17.135.7
226	10.17.135.8/29	10.17.135.9 – 10.17.135.14	10.17.135.15
227	10.17.135.16/29	10.17.135.17 – 10.17.135.22	10.17.135.23
228	10.17.135.24/29	10.17.135.25 – 10.17.135.30	10.17.135.31
229	10.17.135.32/29	10.17.135.33 – 10.17.135.38	10.17.135.39
230	10.17.135.40/29	10.17.135.41 – 10.17.135.46	10.17.135.47
231	10.17.135.48/29	10.17.135.49 – 10.17.135.54	10.17.135.55
232	10.17.135.56/29	10.17.135.57 – 10.17.135.62	10.17.135.63
233	10.17.135.64/29	10.17.135.65 – 10.17.135.70	10.17.135.71
234	10.17.135.72/29	10.17.135.73 – 10.17.135.78	10.17.135.79
235	10.17.135.80/29	10.17.135.81 – 10.17.135.86	10.17.135.87
236	10.17.135.88/29	10.17.135.89 – 10.17.135.94	10.17.135.95
237	10.17.135.96/29	10.17.135.97 – 10.17.135.102	10.17.135.103
238	10.17.135.104/29	10.17.135.105 – 10.17.135.110	10.17.135.111
239	10.17.135.112/29	10.17.135.113 – 10.17.135.118	10.17.135.119
240	10.17.135.120/29	10.17.135.121 – 10.17.135.126	10.17.135.127
241	10.17.135.128/29	10.17.135.129 – 10.17.135.134	10.17.135.135
242	10.17.135.136/29	10.17.135.137 – 10.17.135.142	10.17.135.143
243	10.17.135.144/29	10.17.135.145 – 10.17.135.150	10.17.135.151
244	10.17.135.152/29	10.17.135.153 – 10.17.135.158	10.17.135.159
245	10.17.135.160/29	10.17.135.161 – 10.17.135.166	10.17.135.167
246	10.17.135.168/29	10.17.135.169 – 10.17.135.174	10.17.135.175
247	10.17.135.176/29	10.17.135.177 – 10.17.135.182	10.17.135.183
248	10.17.135.184/29	10.17.135.185 – 10.17.135.190	10.17.135.191
249	10.17.135.192/29	10.17.135.193 – 10.17.135.198	10.17.135.199
250	10.17.135.200/29	10.17.135.201 – 10.17.135.206	10.17.135.207
251	10.17.135.208/29	10.17.135.209 – 10.17.135.214	10.17.135.215
252	10.17.135.216/29	10.17.135.217 – 10.17.135.222	10.17.135.223
253	10.17.135.224/29	10.17.135.225 – 10.17.135.230	10.17.135.231
254	10.17.135.232/29	10.17.135.233 – 10.17.135.238	10.17.135.239
255	10.17.135.240/29	10.17.135.241 – 10.17.135.246	10.17.135.247
256	10.17.135.248/29	10.17.135.249 – 10.17.135.254	10.17.135.255

showing 256 of 2,048

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →