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)10.3.128.0/18

network10.3.128.0/18

broadcast10.3.191.255

first host10.3.128.1

last host10.3.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.3.128.0/18

address00001010.00000011.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00000011.10000000.00000000

broadcast00001010.00000011.10111111.11111111

green = network part, grey = host part

hex0x0a038000

decimal168001536

reverse dns0.128.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:8000

/18 split into /26 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.128.0/26	10.3.128.1 – 10.3.128.62	10.3.128.63
2	10.3.128.64/26	10.3.128.65 – 10.3.128.126	10.3.128.127
3	10.3.128.128/26	10.3.128.129 – 10.3.128.190	10.3.128.191
4	10.3.128.192/26	10.3.128.193 – 10.3.128.254	10.3.128.255
5	10.3.129.0/26	10.3.129.1 – 10.3.129.62	10.3.129.63
6	10.3.129.64/26	10.3.129.65 – 10.3.129.126	10.3.129.127
7	10.3.129.128/26	10.3.129.129 – 10.3.129.190	10.3.129.191
8	10.3.129.192/26	10.3.129.193 – 10.3.129.254	10.3.129.255
9	10.3.130.0/26	10.3.130.1 – 10.3.130.62	10.3.130.63
10	10.3.130.64/26	10.3.130.65 – 10.3.130.126	10.3.130.127
11	10.3.130.128/26	10.3.130.129 – 10.3.130.190	10.3.130.191
12	10.3.130.192/26	10.3.130.193 – 10.3.130.254	10.3.130.255
13	10.3.131.0/26	10.3.131.1 – 10.3.131.62	10.3.131.63
14	10.3.131.64/26	10.3.131.65 – 10.3.131.126	10.3.131.127
15	10.3.131.128/26	10.3.131.129 – 10.3.131.190	10.3.131.191
16	10.3.131.192/26	10.3.131.193 – 10.3.131.254	10.3.131.255
17	10.3.132.0/26	10.3.132.1 – 10.3.132.62	10.3.132.63
18	10.3.132.64/26	10.3.132.65 – 10.3.132.126	10.3.132.127
19	10.3.132.128/26	10.3.132.129 – 10.3.132.190	10.3.132.191
20	10.3.132.192/26	10.3.132.193 – 10.3.132.254	10.3.132.255
21	10.3.133.0/26	10.3.133.1 – 10.3.133.62	10.3.133.63
22	10.3.133.64/26	10.3.133.65 – 10.3.133.126	10.3.133.127
23	10.3.133.128/26	10.3.133.129 – 10.3.133.190	10.3.133.191
24	10.3.133.192/26	10.3.133.193 – 10.3.133.254	10.3.133.255
25	10.3.134.0/26	10.3.134.1 – 10.3.134.62	10.3.134.63
26	10.3.134.64/26	10.3.134.65 – 10.3.134.126	10.3.134.127
27	10.3.134.128/26	10.3.134.129 – 10.3.134.190	10.3.134.191
28	10.3.134.192/26	10.3.134.193 – 10.3.134.254	10.3.134.255
29	10.3.135.0/26	10.3.135.1 – 10.3.135.62	10.3.135.63
30	10.3.135.64/26	10.3.135.65 – 10.3.135.126	10.3.135.127
31	10.3.135.128/26	10.3.135.129 – 10.3.135.190	10.3.135.191
32	10.3.135.192/26	10.3.135.193 – 10.3.135.254	10.3.135.255
33	10.3.136.0/26	10.3.136.1 – 10.3.136.62	10.3.136.63
34	10.3.136.64/26	10.3.136.65 – 10.3.136.126	10.3.136.127
35	10.3.136.128/26	10.3.136.129 – 10.3.136.190	10.3.136.191
36	10.3.136.192/26	10.3.136.193 – 10.3.136.254	10.3.136.255
37	10.3.137.0/26	10.3.137.1 – 10.3.137.62	10.3.137.63
38	10.3.137.64/26	10.3.137.65 – 10.3.137.126	10.3.137.127
39	10.3.137.128/26	10.3.137.129 – 10.3.137.190	10.3.137.191
40	10.3.137.192/26	10.3.137.193 – 10.3.137.254	10.3.137.255
41	10.3.138.0/26	10.3.138.1 – 10.3.138.62	10.3.138.63
42	10.3.138.64/26	10.3.138.65 – 10.3.138.126	10.3.138.127
43	10.3.138.128/26	10.3.138.129 – 10.3.138.190	10.3.138.191
44	10.3.138.192/26	10.3.138.193 – 10.3.138.254	10.3.138.255
45	10.3.139.0/26	10.3.139.1 – 10.3.139.62	10.3.139.63
46	10.3.139.64/26	10.3.139.65 – 10.3.139.126	10.3.139.127
47	10.3.139.128/26	10.3.139.129 – 10.3.139.190	10.3.139.191
48	10.3.139.192/26	10.3.139.193 – 10.3.139.254	10.3.139.255
49	10.3.140.0/26	10.3.140.1 – 10.3.140.62	10.3.140.63
50	10.3.140.64/26	10.3.140.65 – 10.3.140.126	10.3.140.127
51	10.3.140.128/26	10.3.140.129 – 10.3.140.190	10.3.140.191
52	10.3.140.192/26	10.3.140.193 – 10.3.140.254	10.3.140.255
53	10.3.141.0/26	10.3.141.1 – 10.3.141.62	10.3.141.63
54	10.3.141.64/26	10.3.141.65 – 10.3.141.126	10.3.141.127
55	10.3.141.128/26	10.3.141.129 – 10.3.141.190	10.3.141.191
56	10.3.141.192/26	10.3.141.193 – 10.3.141.254	10.3.141.255
57	10.3.142.0/26	10.3.142.1 – 10.3.142.62	10.3.142.63
58	10.3.142.64/26	10.3.142.65 – 10.3.142.126	10.3.142.127
59	10.3.142.128/26	10.3.142.129 – 10.3.142.190	10.3.142.191
60	10.3.142.192/26	10.3.142.193 – 10.3.142.254	10.3.142.255
61	10.3.143.0/26	10.3.143.1 – 10.3.143.62	10.3.143.63
62	10.3.143.64/26	10.3.143.65 – 10.3.143.126	10.3.143.127
63	10.3.143.128/26	10.3.143.129 – 10.3.143.190	10.3.143.191
64	10.3.143.192/26	10.3.143.193 – 10.3.143.254	10.3.143.255
65	10.3.144.0/26	10.3.144.1 – 10.3.144.62	10.3.144.63
66	10.3.144.64/26	10.3.144.65 – 10.3.144.126	10.3.144.127
67	10.3.144.128/26	10.3.144.129 – 10.3.144.190	10.3.144.191
68	10.3.144.192/26	10.3.144.193 – 10.3.144.254	10.3.144.255
69	10.3.145.0/26	10.3.145.1 – 10.3.145.62	10.3.145.63
70	10.3.145.64/26	10.3.145.65 – 10.3.145.126	10.3.145.127
71	10.3.145.128/26	10.3.145.129 – 10.3.145.190	10.3.145.191
72	10.3.145.192/26	10.3.145.193 – 10.3.145.254	10.3.145.255
73	10.3.146.0/26	10.3.146.1 – 10.3.146.62	10.3.146.63
74	10.3.146.64/26	10.3.146.65 – 10.3.146.126	10.3.146.127
75	10.3.146.128/26	10.3.146.129 – 10.3.146.190	10.3.146.191
76	10.3.146.192/26	10.3.146.193 – 10.3.146.254	10.3.146.255
77	10.3.147.0/26	10.3.147.1 – 10.3.147.62	10.3.147.63
78	10.3.147.64/26	10.3.147.65 – 10.3.147.126	10.3.147.127
79	10.3.147.128/26	10.3.147.129 – 10.3.147.190	10.3.147.191
80	10.3.147.192/26	10.3.147.193 – 10.3.147.254	10.3.147.255
81	10.3.148.0/26	10.3.148.1 – 10.3.148.62	10.3.148.63
82	10.3.148.64/26	10.3.148.65 – 10.3.148.126	10.3.148.127
83	10.3.148.128/26	10.3.148.129 – 10.3.148.190	10.3.148.191
84	10.3.148.192/26	10.3.148.193 – 10.3.148.254	10.3.148.255
85	10.3.149.0/26	10.3.149.1 – 10.3.149.62	10.3.149.63
86	10.3.149.64/26	10.3.149.65 – 10.3.149.126	10.3.149.127
87	10.3.149.128/26	10.3.149.129 – 10.3.149.190	10.3.149.191
88	10.3.149.192/26	10.3.149.193 – 10.3.149.254	10.3.149.255
89	10.3.150.0/26	10.3.150.1 – 10.3.150.62	10.3.150.63
90	10.3.150.64/26	10.3.150.65 – 10.3.150.126	10.3.150.127
91	10.3.150.128/26	10.3.150.129 – 10.3.150.190	10.3.150.191
92	10.3.150.192/26	10.3.150.193 – 10.3.150.254	10.3.150.255
93	10.3.151.0/26	10.3.151.1 – 10.3.151.62	10.3.151.63
94	10.3.151.64/26	10.3.151.65 – 10.3.151.126	10.3.151.127
95	10.3.151.128/26	10.3.151.129 – 10.3.151.190	10.3.151.191
96	10.3.151.192/26	10.3.151.193 – 10.3.151.254	10.3.151.255
97	10.3.152.0/26	10.3.152.1 – 10.3.152.62	10.3.152.63
98	10.3.152.64/26	10.3.152.65 – 10.3.152.126	10.3.152.127
99	10.3.152.128/26	10.3.152.129 – 10.3.152.190	10.3.152.191
100	10.3.152.192/26	10.3.152.193 – 10.3.152.254	10.3.152.255
101	10.3.153.0/26	10.3.153.1 – 10.3.153.62	10.3.153.63
102	10.3.153.64/26	10.3.153.65 – 10.3.153.126	10.3.153.127
103	10.3.153.128/26	10.3.153.129 – 10.3.153.190	10.3.153.191
104	10.3.153.192/26	10.3.153.193 – 10.3.153.254	10.3.153.255
105	10.3.154.0/26	10.3.154.1 – 10.3.154.62	10.3.154.63
106	10.3.154.64/26	10.3.154.65 – 10.3.154.126	10.3.154.127
107	10.3.154.128/26	10.3.154.129 – 10.3.154.190	10.3.154.191
108	10.3.154.192/26	10.3.154.193 – 10.3.154.254	10.3.154.255
109	10.3.155.0/26	10.3.155.1 – 10.3.155.62	10.3.155.63
110	10.3.155.64/26	10.3.155.65 – 10.3.155.126	10.3.155.127
111	10.3.155.128/26	10.3.155.129 – 10.3.155.190	10.3.155.191
112	10.3.155.192/26	10.3.155.193 – 10.3.155.254	10.3.155.255
113	10.3.156.0/26	10.3.156.1 – 10.3.156.62	10.3.156.63
114	10.3.156.64/26	10.3.156.65 – 10.3.156.126	10.3.156.127
115	10.3.156.128/26	10.3.156.129 – 10.3.156.190	10.3.156.191
116	10.3.156.192/26	10.3.156.193 – 10.3.156.254	10.3.156.255
117	10.3.157.0/26	10.3.157.1 – 10.3.157.62	10.3.157.63
118	10.3.157.64/26	10.3.157.65 – 10.3.157.126	10.3.157.127
119	10.3.157.128/26	10.3.157.129 – 10.3.157.190	10.3.157.191
120	10.3.157.192/26	10.3.157.193 – 10.3.157.254	10.3.157.255
121	10.3.158.0/26	10.3.158.1 – 10.3.158.62	10.3.158.63
122	10.3.158.64/26	10.3.158.65 – 10.3.158.126	10.3.158.127
123	10.3.158.128/26	10.3.158.129 – 10.3.158.190	10.3.158.191
124	10.3.158.192/26	10.3.158.193 – 10.3.158.254	10.3.158.255
125	10.3.159.0/26	10.3.159.1 – 10.3.159.62	10.3.159.63
126	10.3.159.64/26	10.3.159.65 – 10.3.159.126	10.3.159.127
127	10.3.159.128/26	10.3.159.129 – 10.3.159.190	10.3.159.191
128	10.3.159.192/26	10.3.159.193 – 10.3.159.254	10.3.159.255
129	10.3.160.0/26	10.3.160.1 – 10.3.160.62	10.3.160.63
130	10.3.160.64/26	10.3.160.65 – 10.3.160.126	10.3.160.127
131	10.3.160.128/26	10.3.160.129 – 10.3.160.190	10.3.160.191
132	10.3.160.192/26	10.3.160.193 – 10.3.160.254	10.3.160.255
133	10.3.161.0/26	10.3.161.1 – 10.3.161.62	10.3.161.63
134	10.3.161.64/26	10.3.161.65 – 10.3.161.126	10.3.161.127
135	10.3.161.128/26	10.3.161.129 – 10.3.161.190	10.3.161.191
136	10.3.161.192/26	10.3.161.193 – 10.3.161.254	10.3.161.255
137	10.3.162.0/26	10.3.162.1 – 10.3.162.62	10.3.162.63
138	10.3.162.64/26	10.3.162.65 – 10.3.162.126	10.3.162.127
139	10.3.162.128/26	10.3.162.129 – 10.3.162.190	10.3.162.191
140	10.3.162.192/26	10.3.162.193 – 10.3.162.254	10.3.162.255
141	10.3.163.0/26	10.3.163.1 – 10.3.163.62	10.3.163.63
142	10.3.163.64/26	10.3.163.65 – 10.3.163.126	10.3.163.127
143	10.3.163.128/26	10.3.163.129 – 10.3.163.190	10.3.163.191
144	10.3.163.192/26	10.3.163.193 – 10.3.163.254	10.3.163.255
145	10.3.164.0/26	10.3.164.1 – 10.3.164.62	10.3.164.63
146	10.3.164.64/26	10.3.164.65 – 10.3.164.126	10.3.164.127
147	10.3.164.128/26	10.3.164.129 – 10.3.164.190	10.3.164.191
148	10.3.164.192/26	10.3.164.193 – 10.3.164.254	10.3.164.255
149	10.3.165.0/26	10.3.165.1 – 10.3.165.62	10.3.165.63
150	10.3.165.64/26	10.3.165.65 – 10.3.165.126	10.3.165.127
151	10.3.165.128/26	10.3.165.129 – 10.3.165.190	10.3.165.191
152	10.3.165.192/26	10.3.165.193 – 10.3.165.254	10.3.165.255
153	10.3.166.0/26	10.3.166.1 – 10.3.166.62	10.3.166.63
154	10.3.166.64/26	10.3.166.65 – 10.3.166.126	10.3.166.127
155	10.3.166.128/26	10.3.166.129 – 10.3.166.190	10.3.166.191
156	10.3.166.192/26	10.3.166.193 – 10.3.166.254	10.3.166.255
157	10.3.167.0/26	10.3.167.1 – 10.3.167.62	10.3.167.63
158	10.3.167.64/26	10.3.167.65 – 10.3.167.126	10.3.167.127
159	10.3.167.128/26	10.3.167.129 – 10.3.167.190	10.3.167.191
160	10.3.167.192/26	10.3.167.193 – 10.3.167.254	10.3.167.255
161	10.3.168.0/26	10.3.168.1 – 10.3.168.62	10.3.168.63
162	10.3.168.64/26	10.3.168.65 – 10.3.168.126	10.3.168.127
163	10.3.168.128/26	10.3.168.129 – 10.3.168.190	10.3.168.191
164	10.3.168.192/26	10.3.168.193 – 10.3.168.254	10.3.168.255
165	10.3.169.0/26	10.3.169.1 – 10.3.169.62	10.3.169.63
166	10.3.169.64/26	10.3.169.65 – 10.3.169.126	10.3.169.127
167	10.3.169.128/26	10.3.169.129 – 10.3.169.190	10.3.169.191
168	10.3.169.192/26	10.3.169.193 – 10.3.169.254	10.3.169.255
169	10.3.170.0/26	10.3.170.1 – 10.3.170.62	10.3.170.63
170	10.3.170.64/26	10.3.170.65 – 10.3.170.126	10.3.170.127
171	10.3.170.128/26	10.3.170.129 – 10.3.170.190	10.3.170.191
172	10.3.170.192/26	10.3.170.193 – 10.3.170.254	10.3.170.255
173	10.3.171.0/26	10.3.171.1 – 10.3.171.62	10.3.171.63
174	10.3.171.64/26	10.3.171.65 – 10.3.171.126	10.3.171.127
175	10.3.171.128/26	10.3.171.129 – 10.3.171.190	10.3.171.191
176	10.3.171.192/26	10.3.171.193 – 10.3.171.254	10.3.171.255
177	10.3.172.0/26	10.3.172.1 – 10.3.172.62	10.3.172.63
178	10.3.172.64/26	10.3.172.65 – 10.3.172.126	10.3.172.127
179	10.3.172.128/26	10.3.172.129 – 10.3.172.190	10.3.172.191
180	10.3.172.192/26	10.3.172.193 – 10.3.172.254	10.3.172.255
181	10.3.173.0/26	10.3.173.1 – 10.3.173.62	10.3.173.63
182	10.3.173.64/26	10.3.173.65 – 10.3.173.126	10.3.173.127
183	10.3.173.128/26	10.3.173.129 – 10.3.173.190	10.3.173.191
184	10.3.173.192/26	10.3.173.193 – 10.3.173.254	10.3.173.255
185	10.3.174.0/26	10.3.174.1 – 10.3.174.62	10.3.174.63
186	10.3.174.64/26	10.3.174.65 – 10.3.174.126	10.3.174.127
187	10.3.174.128/26	10.3.174.129 – 10.3.174.190	10.3.174.191
188	10.3.174.192/26	10.3.174.193 – 10.3.174.254	10.3.174.255
189	10.3.175.0/26	10.3.175.1 – 10.3.175.62	10.3.175.63
190	10.3.175.64/26	10.3.175.65 – 10.3.175.126	10.3.175.127
191	10.3.175.128/26	10.3.175.129 – 10.3.175.190	10.3.175.191
192	10.3.175.192/26	10.3.175.193 – 10.3.175.254	10.3.175.255
193	10.3.176.0/26	10.3.176.1 – 10.3.176.62	10.3.176.63
194	10.3.176.64/26	10.3.176.65 – 10.3.176.126	10.3.176.127
195	10.3.176.128/26	10.3.176.129 – 10.3.176.190	10.3.176.191
196	10.3.176.192/26	10.3.176.193 – 10.3.176.254	10.3.176.255
197	10.3.177.0/26	10.3.177.1 – 10.3.177.62	10.3.177.63
198	10.3.177.64/26	10.3.177.65 – 10.3.177.126	10.3.177.127
199	10.3.177.128/26	10.3.177.129 – 10.3.177.190	10.3.177.191
200	10.3.177.192/26	10.3.177.193 – 10.3.177.254	10.3.177.255
201	10.3.178.0/26	10.3.178.1 – 10.3.178.62	10.3.178.63
202	10.3.178.64/26	10.3.178.65 – 10.3.178.126	10.3.178.127
203	10.3.178.128/26	10.3.178.129 – 10.3.178.190	10.3.178.191
204	10.3.178.192/26	10.3.178.193 – 10.3.178.254	10.3.178.255
205	10.3.179.0/26	10.3.179.1 – 10.3.179.62	10.3.179.63
206	10.3.179.64/26	10.3.179.65 – 10.3.179.126	10.3.179.127
207	10.3.179.128/26	10.3.179.129 – 10.3.179.190	10.3.179.191
208	10.3.179.192/26	10.3.179.193 – 10.3.179.254	10.3.179.255
209	10.3.180.0/26	10.3.180.1 – 10.3.180.62	10.3.180.63
210	10.3.180.64/26	10.3.180.65 – 10.3.180.126	10.3.180.127
211	10.3.180.128/26	10.3.180.129 – 10.3.180.190	10.3.180.191
212	10.3.180.192/26	10.3.180.193 – 10.3.180.254	10.3.180.255
213	10.3.181.0/26	10.3.181.1 – 10.3.181.62	10.3.181.63
214	10.3.181.64/26	10.3.181.65 – 10.3.181.126	10.3.181.127
215	10.3.181.128/26	10.3.181.129 – 10.3.181.190	10.3.181.191
216	10.3.181.192/26	10.3.181.193 – 10.3.181.254	10.3.181.255
217	10.3.182.0/26	10.3.182.1 – 10.3.182.62	10.3.182.63
218	10.3.182.64/26	10.3.182.65 – 10.3.182.126	10.3.182.127
219	10.3.182.128/26	10.3.182.129 – 10.3.182.190	10.3.182.191
220	10.3.182.192/26	10.3.182.193 – 10.3.182.254	10.3.182.255
221	10.3.183.0/26	10.3.183.1 – 10.3.183.62	10.3.183.63
222	10.3.183.64/26	10.3.183.65 – 10.3.183.126	10.3.183.127
223	10.3.183.128/26	10.3.183.129 – 10.3.183.190	10.3.183.191
224	10.3.183.192/26	10.3.183.193 – 10.3.183.254	10.3.183.255
225	10.3.184.0/26	10.3.184.1 – 10.3.184.62	10.3.184.63
226	10.3.184.64/26	10.3.184.65 – 10.3.184.126	10.3.184.127
227	10.3.184.128/26	10.3.184.129 – 10.3.184.190	10.3.184.191
228	10.3.184.192/26	10.3.184.193 – 10.3.184.254	10.3.184.255
229	10.3.185.0/26	10.3.185.1 – 10.3.185.62	10.3.185.63
230	10.3.185.64/26	10.3.185.65 – 10.3.185.126	10.3.185.127
231	10.3.185.128/26	10.3.185.129 – 10.3.185.190	10.3.185.191
232	10.3.185.192/26	10.3.185.193 – 10.3.185.254	10.3.185.255
233	10.3.186.0/26	10.3.186.1 – 10.3.186.62	10.3.186.63
234	10.3.186.64/26	10.3.186.65 – 10.3.186.126	10.3.186.127
235	10.3.186.128/26	10.3.186.129 – 10.3.186.190	10.3.186.191
236	10.3.186.192/26	10.3.186.193 – 10.3.186.254	10.3.186.255
237	10.3.187.0/26	10.3.187.1 – 10.3.187.62	10.3.187.63
238	10.3.187.64/26	10.3.187.65 – 10.3.187.126	10.3.187.127
239	10.3.187.128/26	10.3.187.129 – 10.3.187.190	10.3.187.191
240	10.3.187.192/26	10.3.187.193 – 10.3.187.254	10.3.187.255
241	10.3.188.0/26	10.3.188.1 – 10.3.188.62	10.3.188.63
242	10.3.188.64/26	10.3.188.65 – 10.3.188.126	10.3.188.127
243	10.3.188.128/26	10.3.188.129 – 10.3.188.190	10.3.188.191
244	10.3.188.192/26	10.3.188.193 – 10.3.188.254	10.3.188.255
245	10.3.189.0/26	10.3.189.1 – 10.3.189.62	10.3.189.63
246	10.3.189.64/26	10.3.189.65 – 10.3.189.126	10.3.189.127
247	10.3.189.128/26	10.3.189.129 – 10.3.189.190	10.3.189.191
248	10.3.189.192/26	10.3.189.193 – 10.3.189.254	10.3.189.255
249	10.3.190.0/26	10.3.190.1 – 10.3.190.62	10.3.190.63
250	10.3.190.64/26	10.3.190.65 – 10.3.190.126	10.3.190.127
251	10.3.190.128/26	10.3.190.129 – 10.3.190.190	10.3.190.191
252	10.3.190.192/26	10.3.190.193 – 10.3.190.254	10.3.190.255
253	10.3.191.0/26	10.3.191.1 – 10.3.191.62	10.3.191.63
254	10.3.191.64/26	10.3.191.65 – 10.3.191.126	10.3.191.127
255	10.3.191.128/26	10.3.191.129 – 10.3.191.190	10.3.191.191
256	10.3.191.192/26	10.3.191.193 – 10.3.191.254	10.3.191.255

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 →