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)10.18.128.0/17

network10.18.128.0/17

broadcast10.18.255.255

first host10.18.128.1

last host10.18.255.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.18.128.0/17

address00001010.00010010.10000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.00010010.10000000.00000000

broadcast00001010.00010010.11111111.11111111

green = network part, grey = host part

hex0x0a128000

decimal168984576

reverse dns0.128.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:8000

/17 split into /29 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.18.128.0/29	10.18.128.1 – 10.18.128.6	10.18.128.7
2	10.18.128.8/29	10.18.128.9 – 10.18.128.14	10.18.128.15
3	10.18.128.16/29	10.18.128.17 – 10.18.128.22	10.18.128.23
4	10.18.128.24/29	10.18.128.25 – 10.18.128.30	10.18.128.31
5	10.18.128.32/29	10.18.128.33 – 10.18.128.38	10.18.128.39
6	10.18.128.40/29	10.18.128.41 – 10.18.128.46	10.18.128.47
7	10.18.128.48/29	10.18.128.49 – 10.18.128.54	10.18.128.55
8	10.18.128.56/29	10.18.128.57 – 10.18.128.62	10.18.128.63
9	10.18.128.64/29	10.18.128.65 – 10.18.128.70	10.18.128.71
10	10.18.128.72/29	10.18.128.73 – 10.18.128.78	10.18.128.79
11	10.18.128.80/29	10.18.128.81 – 10.18.128.86	10.18.128.87
12	10.18.128.88/29	10.18.128.89 – 10.18.128.94	10.18.128.95
13	10.18.128.96/29	10.18.128.97 – 10.18.128.102	10.18.128.103
14	10.18.128.104/29	10.18.128.105 – 10.18.128.110	10.18.128.111
15	10.18.128.112/29	10.18.128.113 – 10.18.128.118	10.18.128.119
16	10.18.128.120/29	10.18.128.121 – 10.18.128.126	10.18.128.127
17	10.18.128.128/29	10.18.128.129 – 10.18.128.134	10.18.128.135
18	10.18.128.136/29	10.18.128.137 – 10.18.128.142	10.18.128.143
19	10.18.128.144/29	10.18.128.145 – 10.18.128.150	10.18.128.151
20	10.18.128.152/29	10.18.128.153 – 10.18.128.158	10.18.128.159
21	10.18.128.160/29	10.18.128.161 – 10.18.128.166	10.18.128.167
22	10.18.128.168/29	10.18.128.169 – 10.18.128.174	10.18.128.175
23	10.18.128.176/29	10.18.128.177 – 10.18.128.182	10.18.128.183
24	10.18.128.184/29	10.18.128.185 – 10.18.128.190	10.18.128.191
25	10.18.128.192/29	10.18.128.193 – 10.18.128.198	10.18.128.199
26	10.18.128.200/29	10.18.128.201 – 10.18.128.206	10.18.128.207
27	10.18.128.208/29	10.18.128.209 – 10.18.128.214	10.18.128.215
28	10.18.128.216/29	10.18.128.217 – 10.18.128.222	10.18.128.223
29	10.18.128.224/29	10.18.128.225 – 10.18.128.230	10.18.128.231
30	10.18.128.232/29	10.18.128.233 – 10.18.128.238	10.18.128.239
31	10.18.128.240/29	10.18.128.241 – 10.18.128.246	10.18.128.247
32	10.18.128.248/29	10.18.128.249 – 10.18.128.254	10.18.128.255
33	10.18.129.0/29	10.18.129.1 – 10.18.129.6	10.18.129.7
34	10.18.129.8/29	10.18.129.9 – 10.18.129.14	10.18.129.15
35	10.18.129.16/29	10.18.129.17 – 10.18.129.22	10.18.129.23
36	10.18.129.24/29	10.18.129.25 – 10.18.129.30	10.18.129.31
37	10.18.129.32/29	10.18.129.33 – 10.18.129.38	10.18.129.39
38	10.18.129.40/29	10.18.129.41 – 10.18.129.46	10.18.129.47
39	10.18.129.48/29	10.18.129.49 – 10.18.129.54	10.18.129.55
40	10.18.129.56/29	10.18.129.57 – 10.18.129.62	10.18.129.63
41	10.18.129.64/29	10.18.129.65 – 10.18.129.70	10.18.129.71
42	10.18.129.72/29	10.18.129.73 – 10.18.129.78	10.18.129.79
43	10.18.129.80/29	10.18.129.81 – 10.18.129.86	10.18.129.87
44	10.18.129.88/29	10.18.129.89 – 10.18.129.94	10.18.129.95
45	10.18.129.96/29	10.18.129.97 – 10.18.129.102	10.18.129.103
46	10.18.129.104/29	10.18.129.105 – 10.18.129.110	10.18.129.111
47	10.18.129.112/29	10.18.129.113 – 10.18.129.118	10.18.129.119
48	10.18.129.120/29	10.18.129.121 – 10.18.129.126	10.18.129.127
49	10.18.129.128/29	10.18.129.129 – 10.18.129.134	10.18.129.135
50	10.18.129.136/29	10.18.129.137 – 10.18.129.142	10.18.129.143
51	10.18.129.144/29	10.18.129.145 – 10.18.129.150	10.18.129.151
52	10.18.129.152/29	10.18.129.153 – 10.18.129.158	10.18.129.159
53	10.18.129.160/29	10.18.129.161 – 10.18.129.166	10.18.129.167
54	10.18.129.168/29	10.18.129.169 – 10.18.129.174	10.18.129.175
55	10.18.129.176/29	10.18.129.177 – 10.18.129.182	10.18.129.183
56	10.18.129.184/29	10.18.129.185 – 10.18.129.190	10.18.129.191
57	10.18.129.192/29	10.18.129.193 – 10.18.129.198	10.18.129.199
58	10.18.129.200/29	10.18.129.201 – 10.18.129.206	10.18.129.207
59	10.18.129.208/29	10.18.129.209 – 10.18.129.214	10.18.129.215
60	10.18.129.216/29	10.18.129.217 – 10.18.129.222	10.18.129.223
61	10.18.129.224/29	10.18.129.225 – 10.18.129.230	10.18.129.231
62	10.18.129.232/29	10.18.129.233 – 10.18.129.238	10.18.129.239
63	10.18.129.240/29	10.18.129.241 – 10.18.129.246	10.18.129.247
64	10.18.129.248/29	10.18.129.249 – 10.18.129.254	10.18.129.255
65	10.18.130.0/29	10.18.130.1 – 10.18.130.6	10.18.130.7
66	10.18.130.8/29	10.18.130.9 – 10.18.130.14	10.18.130.15
67	10.18.130.16/29	10.18.130.17 – 10.18.130.22	10.18.130.23
68	10.18.130.24/29	10.18.130.25 – 10.18.130.30	10.18.130.31
69	10.18.130.32/29	10.18.130.33 – 10.18.130.38	10.18.130.39
70	10.18.130.40/29	10.18.130.41 – 10.18.130.46	10.18.130.47
71	10.18.130.48/29	10.18.130.49 – 10.18.130.54	10.18.130.55
72	10.18.130.56/29	10.18.130.57 – 10.18.130.62	10.18.130.63
73	10.18.130.64/29	10.18.130.65 – 10.18.130.70	10.18.130.71
74	10.18.130.72/29	10.18.130.73 – 10.18.130.78	10.18.130.79
75	10.18.130.80/29	10.18.130.81 – 10.18.130.86	10.18.130.87
76	10.18.130.88/29	10.18.130.89 – 10.18.130.94	10.18.130.95
77	10.18.130.96/29	10.18.130.97 – 10.18.130.102	10.18.130.103
78	10.18.130.104/29	10.18.130.105 – 10.18.130.110	10.18.130.111
79	10.18.130.112/29	10.18.130.113 – 10.18.130.118	10.18.130.119
80	10.18.130.120/29	10.18.130.121 – 10.18.130.126	10.18.130.127
81	10.18.130.128/29	10.18.130.129 – 10.18.130.134	10.18.130.135
82	10.18.130.136/29	10.18.130.137 – 10.18.130.142	10.18.130.143
83	10.18.130.144/29	10.18.130.145 – 10.18.130.150	10.18.130.151
84	10.18.130.152/29	10.18.130.153 – 10.18.130.158	10.18.130.159
85	10.18.130.160/29	10.18.130.161 – 10.18.130.166	10.18.130.167
86	10.18.130.168/29	10.18.130.169 – 10.18.130.174	10.18.130.175
87	10.18.130.176/29	10.18.130.177 – 10.18.130.182	10.18.130.183
88	10.18.130.184/29	10.18.130.185 – 10.18.130.190	10.18.130.191
89	10.18.130.192/29	10.18.130.193 – 10.18.130.198	10.18.130.199
90	10.18.130.200/29	10.18.130.201 – 10.18.130.206	10.18.130.207
91	10.18.130.208/29	10.18.130.209 – 10.18.130.214	10.18.130.215
92	10.18.130.216/29	10.18.130.217 – 10.18.130.222	10.18.130.223
93	10.18.130.224/29	10.18.130.225 – 10.18.130.230	10.18.130.231
94	10.18.130.232/29	10.18.130.233 – 10.18.130.238	10.18.130.239
95	10.18.130.240/29	10.18.130.241 – 10.18.130.246	10.18.130.247
96	10.18.130.248/29	10.18.130.249 – 10.18.130.254	10.18.130.255
97	10.18.131.0/29	10.18.131.1 – 10.18.131.6	10.18.131.7
98	10.18.131.8/29	10.18.131.9 – 10.18.131.14	10.18.131.15
99	10.18.131.16/29	10.18.131.17 – 10.18.131.22	10.18.131.23
100	10.18.131.24/29	10.18.131.25 – 10.18.131.30	10.18.131.31
101	10.18.131.32/29	10.18.131.33 – 10.18.131.38	10.18.131.39
102	10.18.131.40/29	10.18.131.41 – 10.18.131.46	10.18.131.47
103	10.18.131.48/29	10.18.131.49 – 10.18.131.54	10.18.131.55
104	10.18.131.56/29	10.18.131.57 – 10.18.131.62	10.18.131.63
105	10.18.131.64/29	10.18.131.65 – 10.18.131.70	10.18.131.71
106	10.18.131.72/29	10.18.131.73 – 10.18.131.78	10.18.131.79
107	10.18.131.80/29	10.18.131.81 – 10.18.131.86	10.18.131.87
108	10.18.131.88/29	10.18.131.89 – 10.18.131.94	10.18.131.95
109	10.18.131.96/29	10.18.131.97 – 10.18.131.102	10.18.131.103
110	10.18.131.104/29	10.18.131.105 – 10.18.131.110	10.18.131.111
111	10.18.131.112/29	10.18.131.113 – 10.18.131.118	10.18.131.119
112	10.18.131.120/29	10.18.131.121 – 10.18.131.126	10.18.131.127
113	10.18.131.128/29	10.18.131.129 – 10.18.131.134	10.18.131.135
114	10.18.131.136/29	10.18.131.137 – 10.18.131.142	10.18.131.143
115	10.18.131.144/29	10.18.131.145 – 10.18.131.150	10.18.131.151
116	10.18.131.152/29	10.18.131.153 – 10.18.131.158	10.18.131.159
117	10.18.131.160/29	10.18.131.161 – 10.18.131.166	10.18.131.167
118	10.18.131.168/29	10.18.131.169 – 10.18.131.174	10.18.131.175
119	10.18.131.176/29	10.18.131.177 – 10.18.131.182	10.18.131.183
120	10.18.131.184/29	10.18.131.185 – 10.18.131.190	10.18.131.191
121	10.18.131.192/29	10.18.131.193 – 10.18.131.198	10.18.131.199
122	10.18.131.200/29	10.18.131.201 – 10.18.131.206	10.18.131.207
123	10.18.131.208/29	10.18.131.209 – 10.18.131.214	10.18.131.215
124	10.18.131.216/29	10.18.131.217 – 10.18.131.222	10.18.131.223
125	10.18.131.224/29	10.18.131.225 – 10.18.131.230	10.18.131.231
126	10.18.131.232/29	10.18.131.233 – 10.18.131.238	10.18.131.239
127	10.18.131.240/29	10.18.131.241 – 10.18.131.246	10.18.131.247
128	10.18.131.248/29	10.18.131.249 – 10.18.131.254	10.18.131.255
129	10.18.132.0/29	10.18.132.1 – 10.18.132.6	10.18.132.7
130	10.18.132.8/29	10.18.132.9 – 10.18.132.14	10.18.132.15
131	10.18.132.16/29	10.18.132.17 – 10.18.132.22	10.18.132.23
132	10.18.132.24/29	10.18.132.25 – 10.18.132.30	10.18.132.31
133	10.18.132.32/29	10.18.132.33 – 10.18.132.38	10.18.132.39
134	10.18.132.40/29	10.18.132.41 – 10.18.132.46	10.18.132.47
135	10.18.132.48/29	10.18.132.49 – 10.18.132.54	10.18.132.55
136	10.18.132.56/29	10.18.132.57 – 10.18.132.62	10.18.132.63
137	10.18.132.64/29	10.18.132.65 – 10.18.132.70	10.18.132.71
138	10.18.132.72/29	10.18.132.73 – 10.18.132.78	10.18.132.79
139	10.18.132.80/29	10.18.132.81 – 10.18.132.86	10.18.132.87
140	10.18.132.88/29	10.18.132.89 – 10.18.132.94	10.18.132.95
141	10.18.132.96/29	10.18.132.97 – 10.18.132.102	10.18.132.103
142	10.18.132.104/29	10.18.132.105 – 10.18.132.110	10.18.132.111
143	10.18.132.112/29	10.18.132.113 – 10.18.132.118	10.18.132.119
144	10.18.132.120/29	10.18.132.121 – 10.18.132.126	10.18.132.127
145	10.18.132.128/29	10.18.132.129 – 10.18.132.134	10.18.132.135
146	10.18.132.136/29	10.18.132.137 – 10.18.132.142	10.18.132.143
147	10.18.132.144/29	10.18.132.145 – 10.18.132.150	10.18.132.151
148	10.18.132.152/29	10.18.132.153 – 10.18.132.158	10.18.132.159
149	10.18.132.160/29	10.18.132.161 – 10.18.132.166	10.18.132.167
150	10.18.132.168/29	10.18.132.169 – 10.18.132.174	10.18.132.175
151	10.18.132.176/29	10.18.132.177 – 10.18.132.182	10.18.132.183
152	10.18.132.184/29	10.18.132.185 – 10.18.132.190	10.18.132.191
153	10.18.132.192/29	10.18.132.193 – 10.18.132.198	10.18.132.199
154	10.18.132.200/29	10.18.132.201 – 10.18.132.206	10.18.132.207
155	10.18.132.208/29	10.18.132.209 – 10.18.132.214	10.18.132.215
156	10.18.132.216/29	10.18.132.217 – 10.18.132.222	10.18.132.223
157	10.18.132.224/29	10.18.132.225 – 10.18.132.230	10.18.132.231
158	10.18.132.232/29	10.18.132.233 – 10.18.132.238	10.18.132.239
159	10.18.132.240/29	10.18.132.241 – 10.18.132.246	10.18.132.247
160	10.18.132.248/29	10.18.132.249 – 10.18.132.254	10.18.132.255
161	10.18.133.0/29	10.18.133.1 – 10.18.133.6	10.18.133.7
162	10.18.133.8/29	10.18.133.9 – 10.18.133.14	10.18.133.15
163	10.18.133.16/29	10.18.133.17 – 10.18.133.22	10.18.133.23
164	10.18.133.24/29	10.18.133.25 – 10.18.133.30	10.18.133.31
165	10.18.133.32/29	10.18.133.33 – 10.18.133.38	10.18.133.39
166	10.18.133.40/29	10.18.133.41 – 10.18.133.46	10.18.133.47
167	10.18.133.48/29	10.18.133.49 – 10.18.133.54	10.18.133.55
168	10.18.133.56/29	10.18.133.57 – 10.18.133.62	10.18.133.63
169	10.18.133.64/29	10.18.133.65 – 10.18.133.70	10.18.133.71
170	10.18.133.72/29	10.18.133.73 – 10.18.133.78	10.18.133.79
171	10.18.133.80/29	10.18.133.81 – 10.18.133.86	10.18.133.87
172	10.18.133.88/29	10.18.133.89 – 10.18.133.94	10.18.133.95
173	10.18.133.96/29	10.18.133.97 – 10.18.133.102	10.18.133.103
174	10.18.133.104/29	10.18.133.105 – 10.18.133.110	10.18.133.111
175	10.18.133.112/29	10.18.133.113 – 10.18.133.118	10.18.133.119
176	10.18.133.120/29	10.18.133.121 – 10.18.133.126	10.18.133.127
177	10.18.133.128/29	10.18.133.129 – 10.18.133.134	10.18.133.135
178	10.18.133.136/29	10.18.133.137 – 10.18.133.142	10.18.133.143
179	10.18.133.144/29	10.18.133.145 – 10.18.133.150	10.18.133.151
180	10.18.133.152/29	10.18.133.153 – 10.18.133.158	10.18.133.159
181	10.18.133.160/29	10.18.133.161 – 10.18.133.166	10.18.133.167
182	10.18.133.168/29	10.18.133.169 – 10.18.133.174	10.18.133.175
183	10.18.133.176/29	10.18.133.177 – 10.18.133.182	10.18.133.183
184	10.18.133.184/29	10.18.133.185 – 10.18.133.190	10.18.133.191
185	10.18.133.192/29	10.18.133.193 – 10.18.133.198	10.18.133.199
186	10.18.133.200/29	10.18.133.201 – 10.18.133.206	10.18.133.207
187	10.18.133.208/29	10.18.133.209 – 10.18.133.214	10.18.133.215
188	10.18.133.216/29	10.18.133.217 – 10.18.133.222	10.18.133.223
189	10.18.133.224/29	10.18.133.225 – 10.18.133.230	10.18.133.231
190	10.18.133.232/29	10.18.133.233 – 10.18.133.238	10.18.133.239
191	10.18.133.240/29	10.18.133.241 – 10.18.133.246	10.18.133.247
192	10.18.133.248/29	10.18.133.249 – 10.18.133.254	10.18.133.255
193	10.18.134.0/29	10.18.134.1 – 10.18.134.6	10.18.134.7
194	10.18.134.8/29	10.18.134.9 – 10.18.134.14	10.18.134.15
195	10.18.134.16/29	10.18.134.17 – 10.18.134.22	10.18.134.23
196	10.18.134.24/29	10.18.134.25 – 10.18.134.30	10.18.134.31
197	10.18.134.32/29	10.18.134.33 – 10.18.134.38	10.18.134.39
198	10.18.134.40/29	10.18.134.41 – 10.18.134.46	10.18.134.47
199	10.18.134.48/29	10.18.134.49 – 10.18.134.54	10.18.134.55
200	10.18.134.56/29	10.18.134.57 – 10.18.134.62	10.18.134.63
201	10.18.134.64/29	10.18.134.65 – 10.18.134.70	10.18.134.71
202	10.18.134.72/29	10.18.134.73 – 10.18.134.78	10.18.134.79
203	10.18.134.80/29	10.18.134.81 – 10.18.134.86	10.18.134.87
204	10.18.134.88/29	10.18.134.89 – 10.18.134.94	10.18.134.95
205	10.18.134.96/29	10.18.134.97 – 10.18.134.102	10.18.134.103
206	10.18.134.104/29	10.18.134.105 – 10.18.134.110	10.18.134.111
207	10.18.134.112/29	10.18.134.113 – 10.18.134.118	10.18.134.119
208	10.18.134.120/29	10.18.134.121 – 10.18.134.126	10.18.134.127
209	10.18.134.128/29	10.18.134.129 – 10.18.134.134	10.18.134.135
210	10.18.134.136/29	10.18.134.137 – 10.18.134.142	10.18.134.143
211	10.18.134.144/29	10.18.134.145 – 10.18.134.150	10.18.134.151
212	10.18.134.152/29	10.18.134.153 – 10.18.134.158	10.18.134.159
213	10.18.134.160/29	10.18.134.161 – 10.18.134.166	10.18.134.167
214	10.18.134.168/29	10.18.134.169 – 10.18.134.174	10.18.134.175
215	10.18.134.176/29	10.18.134.177 – 10.18.134.182	10.18.134.183
216	10.18.134.184/29	10.18.134.185 – 10.18.134.190	10.18.134.191
217	10.18.134.192/29	10.18.134.193 – 10.18.134.198	10.18.134.199
218	10.18.134.200/29	10.18.134.201 – 10.18.134.206	10.18.134.207
219	10.18.134.208/29	10.18.134.209 – 10.18.134.214	10.18.134.215
220	10.18.134.216/29	10.18.134.217 – 10.18.134.222	10.18.134.223
221	10.18.134.224/29	10.18.134.225 – 10.18.134.230	10.18.134.231
222	10.18.134.232/29	10.18.134.233 – 10.18.134.238	10.18.134.239
223	10.18.134.240/29	10.18.134.241 – 10.18.134.246	10.18.134.247
224	10.18.134.248/29	10.18.134.249 – 10.18.134.254	10.18.134.255
225	10.18.135.0/29	10.18.135.1 – 10.18.135.6	10.18.135.7
226	10.18.135.8/29	10.18.135.9 – 10.18.135.14	10.18.135.15
227	10.18.135.16/29	10.18.135.17 – 10.18.135.22	10.18.135.23
228	10.18.135.24/29	10.18.135.25 – 10.18.135.30	10.18.135.31
229	10.18.135.32/29	10.18.135.33 – 10.18.135.38	10.18.135.39
230	10.18.135.40/29	10.18.135.41 – 10.18.135.46	10.18.135.47
231	10.18.135.48/29	10.18.135.49 – 10.18.135.54	10.18.135.55
232	10.18.135.56/29	10.18.135.57 – 10.18.135.62	10.18.135.63
233	10.18.135.64/29	10.18.135.65 – 10.18.135.70	10.18.135.71
234	10.18.135.72/29	10.18.135.73 – 10.18.135.78	10.18.135.79
235	10.18.135.80/29	10.18.135.81 – 10.18.135.86	10.18.135.87
236	10.18.135.88/29	10.18.135.89 – 10.18.135.94	10.18.135.95
237	10.18.135.96/29	10.18.135.97 – 10.18.135.102	10.18.135.103
238	10.18.135.104/29	10.18.135.105 – 10.18.135.110	10.18.135.111
239	10.18.135.112/29	10.18.135.113 – 10.18.135.118	10.18.135.119
240	10.18.135.120/29	10.18.135.121 – 10.18.135.126	10.18.135.127
241	10.18.135.128/29	10.18.135.129 – 10.18.135.134	10.18.135.135
242	10.18.135.136/29	10.18.135.137 – 10.18.135.142	10.18.135.143
243	10.18.135.144/29	10.18.135.145 – 10.18.135.150	10.18.135.151
244	10.18.135.152/29	10.18.135.153 – 10.18.135.158	10.18.135.159
245	10.18.135.160/29	10.18.135.161 – 10.18.135.166	10.18.135.167
246	10.18.135.168/29	10.18.135.169 – 10.18.135.174	10.18.135.175
247	10.18.135.176/29	10.18.135.177 – 10.18.135.182	10.18.135.183
248	10.18.135.184/29	10.18.135.185 – 10.18.135.190	10.18.135.191
249	10.18.135.192/29	10.18.135.193 – 10.18.135.198	10.18.135.199
250	10.18.135.200/29	10.18.135.201 – 10.18.135.206	10.18.135.207
251	10.18.135.208/29	10.18.135.209 – 10.18.135.214	10.18.135.215
252	10.18.135.216/29	10.18.135.217 – 10.18.135.222	10.18.135.223
253	10.18.135.224/29	10.18.135.225 – 10.18.135.230	10.18.135.231
254	10.18.135.232/29	10.18.135.233 – 10.18.135.238	10.18.135.239
255	10.18.135.240/29	10.18.135.241 – 10.18.135.246	10.18.135.247
256	10.18.135.248/29	10.18.135.249 – 10.18.135.254	10.18.135.255

showing 256 of 4,096

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 /17
/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	1
/18	255.255.192.0	16,384	16,382	2 split →
/19	255.255.224.0	8,192	8,190	4 split →
/20	255.255.240.0	4,096	4,094	8 split →
/21	255.255.248.0	2,048	2,046	16 split →
/22	255.255.252.0	1,024	1,022	32 split →
/23	255.255.254.0	512	510	64 split →
/24	255.255.255.0	256	254	128 split →
/25	255.255.255.128	128	126	256 split →
/26	255.255.255.192	64	62	512 split →
/27	255.255.255.224	32	30	1,024 split →
/28	255.255.255.240	16	14	2,048 split →
/29	255.255.255.248	8	6	4,096 split →
/30	255.255.255.252	4	2	8,192 split →
/31	255.255.255.254	2	2	16,384 split →
/32	255.255.255.255	1	1	32,768 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 →