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)10.42.128.0/18

network10.42.128.0/18

broadcast10.42.191.255

first host10.42.128.1

last host10.42.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.42.128.0/18

address00001010.00101010.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101010.10000000.00000000

broadcast00001010.00101010.10111111.11111111

green = network part, grey = host part

hex0x0a2a8000

decimal170557440

reverse dns0.128.42.10.in-addr.arpa

ipv4-mapped::ffff:a2a:8000

/18 split into /26 · 256 subnets

close ×

#	network	host range	broadcast
1	10.42.128.0/26	10.42.128.1 – 10.42.128.62	10.42.128.63
2	10.42.128.64/26	10.42.128.65 – 10.42.128.126	10.42.128.127
3	10.42.128.128/26	10.42.128.129 – 10.42.128.190	10.42.128.191
4	10.42.128.192/26	10.42.128.193 – 10.42.128.254	10.42.128.255
5	10.42.129.0/26	10.42.129.1 – 10.42.129.62	10.42.129.63
6	10.42.129.64/26	10.42.129.65 – 10.42.129.126	10.42.129.127
7	10.42.129.128/26	10.42.129.129 – 10.42.129.190	10.42.129.191
8	10.42.129.192/26	10.42.129.193 – 10.42.129.254	10.42.129.255
9	10.42.130.0/26	10.42.130.1 – 10.42.130.62	10.42.130.63
10	10.42.130.64/26	10.42.130.65 – 10.42.130.126	10.42.130.127
11	10.42.130.128/26	10.42.130.129 – 10.42.130.190	10.42.130.191
12	10.42.130.192/26	10.42.130.193 – 10.42.130.254	10.42.130.255
13	10.42.131.0/26	10.42.131.1 – 10.42.131.62	10.42.131.63
14	10.42.131.64/26	10.42.131.65 – 10.42.131.126	10.42.131.127
15	10.42.131.128/26	10.42.131.129 – 10.42.131.190	10.42.131.191
16	10.42.131.192/26	10.42.131.193 – 10.42.131.254	10.42.131.255
17	10.42.132.0/26	10.42.132.1 – 10.42.132.62	10.42.132.63
18	10.42.132.64/26	10.42.132.65 – 10.42.132.126	10.42.132.127
19	10.42.132.128/26	10.42.132.129 – 10.42.132.190	10.42.132.191
20	10.42.132.192/26	10.42.132.193 – 10.42.132.254	10.42.132.255
21	10.42.133.0/26	10.42.133.1 – 10.42.133.62	10.42.133.63
22	10.42.133.64/26	10.42.133.65 – 10.42.133.126	10.42.133.127
23	10.42.133.128/26	10.42.133.129 – 10.42.133.190	10.42.133.191
24	10.42.133.192/26	10.42.133.193 – 10.42.133.254	10.42.133.255
25	10.42.134.0/26	10.42.134.1 – 10.42.134.62	10.42.134.63
26	10.42.134.64/26	10.42.134.65 – 10.42.134.126	10.42.134.127
27	10.42.134.128/26	10.42.134.129 – 10.42.134.190	10.42.134.191
28	10.42.134.192/26	10.42.134.193 – 10.42.134.254	10.42.134.255
29	10.42.135.0/26	10.42.135.1 – 10.42.135.62	10.42.135.63
30	10.42.135.64/26	10.42.135.65 – 10.42.135.126	10.42.135.127
31	10.42.135.128/26	10.42.135.129 – 10.42.135.190	10.42.135.191
32	10.42.135.192/26	10.42.135.193 – 10.42.135.254	10.42.135.255
33	10.42.136.0/26	10.42.136.1 – 10.42.136.62	10.42.136.63
34	10.42.136.64/26	10.42.136.65 – 10.42.136.126	10.42.136.127
35	10.42.136.128/26	10.42.136.129 – 10.42.136.190	10.42.136.191
36	10.42.136.192/26	10.42.136.193 – 10.42.136.254	10.42.136.255
37	10.42.137.0/26	10.42.137.1 – 10.42.137.62	10.42.137.63
38	10.42.137.64/26	10.42.137.65 – 10.42.137.126	10.42.137.127
39	10.42.137.128/26	10.42.137.129 – 10.42.137.190	10.42.137.191
40	10.42.137.192/26	10.42.137.193 – 10.42.137.254	10.42.137.255
41	10.42.138.0/26	10.42.138.1 – 10.42.138.62	10.42.138.63
42	10.42.138.64/26	10.42.138.65 – 10.42.138.126	10.42.138.127
43	10.42.138.128/26	10.42.138.129 – 10.42.138.190	10.42.138.191
44	10.42.138.192/26	10.42.138.193 – 10.42.138.254	10.42.138.255
45	10.42.139.0/26	10.42.139.1 – 10.42.139.62	10.42.139.63
46	10.42.139.64/26	10.42.139.65 – 10.42.139.126	10.42.139.127
47	10.42.139.128/26	10.42.139.129 – 10.42.139.190	10.42.139.191
48	10.42.139.192/26	10.42.139.193 – 10.42.139.254	10.42.139.255
49	10.42.140.0/26	10.42.140.1 – 10.42.140.62	10.42.140.63
50	10.42.140.64/26	10.42.140.65 – 10.42.140.126	10.42.140.127
51	10.42.140.128/26	10.42.140.129 – 10.42.140.190	10.42.140.191
52	10.42.140.192/26	10.42.140.193 – 10.42.140.254	10.42.140.255
53	10.42.141.0/26	10.42.141.1 – 10.42.141.62	10.42.141.63
54	10.42.141.64/26	10.42.141.65 – 10.42.141.126	10.42.141.127
55	10.42.141.128/26	10.42.141.129 – 10.42.141.190	10.42.141.191
56	10.42.141.192/26	10.42.141.193 – 10.42.141.254	10.42.141.255
57	10.42.142.0/26	10.42.142.1 – 10.42.142.62	10.42.142.63
58	10.42.142.64/26	10.42.142.65 – 10.42.142.126	10.42.142.127
59	10.42.142.128/26	10.42.142.129 – 10.42.142.190	10.42.142.191
60	10.42.142.192/26	10.42.142.193 – 10.42.142.254	10.42.142.255
61	10.42.143.0/26	10.42.143.1 – 10.42.143.62	10.42.143.63
62	10.42.143.64/26	10.42.143.65 – 10.42.143.126	10.42.143.127
63	10.42.143.128/26	10.42.143.129 – 10.42.143.190	10.42.143.191
64	10.42.143.192/26	10.42.143.193 – 10.42.143.254	10.42.143.255
65	10.42.144.0/26	10.42.144.1 – 10.42.144.62	10.42.144.63
66	10.42.144.64/26	10.42.144.65 – 10.42.144.126	10.42.144.127
67	10.42.144.128/26	10.42.144.129 – 10.42.144.190	10.42.144.191
68	10.42.144.192/26	10.42.144.193 – 10.42.144.254	10.42.144.255
69	10.42.145.0/26	10.42.145.1 – 10.42.145.62	10.42.145.63
70	10.42.145.64/26	10.42.145.65 – 10.42.145.126	10.42.145.127
71	10.42.145.128/26	10.42.145.129 – 10.42.145.190	10.42.145.191
72	10.42.145.192/26	10.42.145.193 – 10.42.145.254	10.42.145.255
73	10.42.146.0/26	10.42.146.1 – 10.42.146.62	10.42.146.63
74	10.42.146.64/26	10.42.146.65 – 10.42.146.126	10.42.146.127
75	10.42.146.128/26	10.42.146.129 – 10.42.146.190	10.42.146.191
76	10.42.146.192/26	10.42.146.193 – 10.42.146.254	10.42.146.255
77	10.42.147.0/26	10.42.147.1 – 10.42.147.62	10.42.147.63
78	10.42.147.64/26	10.42.147.65 – 10.42.147.126	10.42.147.127
79	10.42.147.128/26	10.42.147.129 – 10.42.147.190	10.42.147.191
80	10.42.147.192/26	10.42.147.193 – 10.42.147.254	10.42.147.255
81	10.42.148.0/26	10.42.148.1 – 10.42.148.62	10.42.148.63
82	10.42.148.64/26	10.42.148.65 – 10.42.148.126	10.42.148.127
83	10.42.148.128/26	10.42.148.129 – 10.42.148.190	10.42.148.191
84	10.42.148.192/26	10.42.148.193 – 10.42.148.254	10.42.148.255
85	10.42.149.0/26	10.42.149.1 – 10.42.149.62	10.42.149.63
86	10.42.149.64/26	10.42.149.65 – 10.42.149.126	10.42.149.127
87	10.42.149.128/26	10.42.149.129 – 10.42.149.190	10.42.149.191
88	10.42.149.192/26	10.42.149.193 – 10.42.149.254	10.42.149.255
89	10.42.150.0/26	10.42.150.1 – 10.42.150.62	10.42.150.63
90	10.42.150.64/26	10.42.150.65 – 10.42.150.126	10.42.150.127
91	10.42.150.128/26	10.42.150.129 – 10.42.150.190	10.42.150.191
92	10.42.150.192/26	10.42.150.193 – 10.42.150.254	10.42.150.255
93	10.42.151.0/26	10.42.151.1 – 10.42.151.62	10.42.151.63
94	10.42.151.64/26	10.42.151.65 – 10.42.151.126	10.42.151.127
95	10.42.151.128/26	10.42.151.129 – 10.42.151.190	10.42.151.191
96	10.42.151.192/26	10.42.151.193 – 10.42.151.254	10.42.151.255
97	10.42.152.0/26	10.42.152.1 – 10.42.152.62	10.42.152.63
98	10.42.152.64/26	10.42.152.65 – 10.42.152.126	10.42.152.127
99	10.42.152.128/26	10.42.152.129 – 10.42.152.190	10.42.152.191
100	10.42.152.192/26	10.42.152.193 – 10.42.152.254	10.42.152.255
101	10.42.153.0/26	10.42.153.1 – 10.42.153.62	10.42.153.63
102	10.42.153.64/26	10.42.153.65 – 10.42.153.126	10.42.153.127
103	10.42.153.128/26	10.42.153.129 – 10.42.153.190	10.42.153.191
104	10.42.153.192/26	10.42.153.193 – 10.42.153.254	10.42.153.255
105	10.42.154.0/26	10.42.154.1 – 10.42.154.62	10.42.154.63
106	10.42.154.64/26	10.42.154.65 – 10.42.154.126	10.42.154.127
107	10.42.154.128/26	10.42.154.129 – 10.42.154.190	10.42.154.191
108	10.42.154.192/26	10.42.154.193 – 10.42.154.254	10.42.154.255
109	10.42.155.0/26	10.42.155.1 – 10.42.155.62	10.42.155.63
110	10.42.155.64/26	10.42.155.65 – 10.42.155.126	10.42.155.127
111	10.42.155.128/26	10.42.155.129 – 10.42.155.190	10.42.155.191
112	10.42.155.192/26	10.42.155.193 – 10.42.155.254	10.42.155.255
113	10.42.156.0/26	10.42.156.1 – 10.42.156.62	10.42.156.63
114	10.42.156.64/26	10.42.156.65 – 10.42.156.126	10.42.156.127
115	10.42.156.128/26	10.42.156.129 – 10.42.156.190	10.42.156.191
116	10.42.156.192/26	10.42.156.193 – 10.42.156.254	10.42.156.255
117	10.42.157.0/26	10.42.157.1 – 10.42.157.62	10.42.157.63
118	10.42.157.64/26	10.42.157.65 – 10.42.157.126	10.42.157.127
119	10.42.157.128/26	10.42.157.129 – 10.42.157.190	10.42.157.191
120	10.42.157.192/26	10.42.157.193 – 10.42.157.254	10.42.157.255
121	10.42.158.0/26	10.42.158.1 – 10.42.158.62	10.42.158.63
122	10.42.158.64/26	10.42.158.65 – 10.42.158.126	10.42.158.127
123	10.42.158.128/26	10.42.158.129 – 10.42.158.190	10.42.158.191
124	10.42.158.192/26	10.42.158.193 – 10.42.158.254	10.42.158.255
125	10.42.159.0/26	10.42.159.1 – 10.42.159.62	10.42.159.63
126	10.42.159.64/26	10.42.159.65 – 10.42.159.126	10.42.159.127
127	10.42.159.128/26	10.42.159.129 – 10.42.159.190	10.42.159.191
128	10.42.159.192/26	10.42.159.193 – 10.42.159.254	10.42.159.255
129	10.42.160.0/26	10.42.160.1 – 10.42.160.62	10.42.160.63
130	10.42.160.64/26	10.42.160.65 – 10.42.160.126	10.42.160.127
131	10.42.160.128/26	10.42.160.129 – 10.42.160.190	10.42.160.191
132	10.42.160.192/26	10.42.160.193 – 10.42.160.254	10.42.160.255
133	10.42.161.0/26	10.42.161.1 – 10.42.161.62	10.42.161.63
134	10.42.161.64/26	10.42.161.65 – 10.42.161.126	10.42.161.127
135	10.42.161.128/26	10.42.161.129 – 10.42.161.190	10.42.161.191
136	10.42.161.192/26	10.42.161.193 – 10.42.161.254	10.42.161.255
137	10.42.162.0/26	10.42.162.1 – 10.42.162.62	10.42.162.63
138	10.42.162.64/26	10.42.162.65 – 10.42.162.126	10.42.162.127
139	10.42.162.128/26	10.42.162.129 – 10.42.162.190	10.42.162.191
140	10.42.162.192/26	10.42.162.193 – 10.42.162.254	10.42.162.255
141	10.42.163.0/26	10.42.163.1 – 10.42.163.62	10.42.163.63
142	10.42.163.64/26	10.42.163.65 – 10.42.163.126	10.42.163.127
143	10.42.163.128/26	10.42.163.129 – 10.42.163.190	10.42.163.191
144	10.42.163.192/26	10.42.163.193 – 10.42.163.254	10.42.163.255
145	10.42.164.0/26	10.42.164.1 – 10.42.164.62	10.42.164.63
146	10.42.164.64/26	10.42.164.65 – 10.42.164.126	10.42.164.127
147	10.42.164.128/26	10.42.164.129 – 10.42.164.190	10.42.164.191
148	10.42.164.192/26	10.42.164.193 – 10.42.164.254	10.42.164.255
149	10.42.165.0/26	10.42.165.1 – 10.42.165.62	10.42.165.63
150	10.42.165.64/26	10.42.165.65 – 10.42.165.126	10.42.165.127
151	10.42.165.128/26	10.42.165.129 – 10.42.165.190	10.42.165.191
152	10.42.165.192/26	10.42.165.193 – 10.42.165.254	10.42.165.255
153	10.42.166.0/26	10.42.166.1 – 10.42.166.62	10.42.166.63
154	10.42.166.64/26	10.42.166.65 – 10.42.166.126	10.42.166.127
155	10.42.166.128/26	10.42.166.129 – 10.42.166.190	10.42.166.191
156	10.42.166.192/26	10.42.166.193 – 10.42.166.254	10.42.166.255
157	10.42.167.0/26	10.42.167.1 – 10.42.167.62	10.42.167.63
158	10.42.167.64/26	10.42.167.65 – 10.42.167.126	10.42.167.127
159	10.42.167.128/26	10.42.167.129 – 10.42.167.190	10.42.167.191
160	10.42.167.192/26	10.42.167.193 – 10.42.167.254	10.42.167.255
161	10.42.168.0/26	10.42.168.1 – 10.42.168.62	10.42.168.63
162	10.42.168.64/26	10.42.168.65 – 10.42.168.126	10.42.168.127
163	10.42.168.128/26	10.42.168.129 – 10.42.168.190	10.42.168.191
164	10.42.168.192/26	10.42.168.193 – 10.42.168.254	10.42.168.255
165	10.42.169.0/26	10.42.169.1 – 10.42.169.62	10.42.169.63
166	10.42.169.64/26	10.42.169.65 – 10.42.169.126	10.42.169.127
167	10.42.169.128/26	10.42.169.129 – 10.42.169.190	10.42.169.191
168	10.42.169.192/26	10.42.169.193 – 10.42.169.254	10.42.169.255
169	10.42.170.0/26	10.42.170.1 – 10.42.170.62	10.42.170.63
170	10.42.170.64/26	10.42.170.65 – 10.42.170.126	10.42.170.127
171	10.42.170.128/26	10.42.170.129 – 10.42.170.190	10.42.170.191
172	10.42.170.192/26	10.42.170.193 – 10.42.170.254	10.42.170.255
173	10.42.171.0/26	10.42.171.1 – 10.42.171.62	10.42.171.63
174	10.42.171.64/26	10.42.171.65 – 10.42.171.126	10.42.171.127
175	10.42.171.128/26	10.42.171.129 – 10.42.171.190	10.42.171.191
176	10.42.171.192/26	10.42.171.193 – 10.42.171.254	10.42.171.255
177	10.42.172.0/26	10.42.172.1 – 10.42.172.62	10.42.172.63
178	10.42.172.64/26	10.42.172.65 – 10.42.172.126	10.42.172.127
179	10.42.172.128/26	10.42.172.129 – 10.42.172.190	10.42.172.191
180	10.42.172.192/26	10.42.172.193 – 10.42.172.254	10.42.172.255
181	10.42.173.0/26	10.42.173.1 – 10.42.173.62	10.42.173.63
182	10.42.173.64/26	10.42.173.65 – 10.42.173.126	10.42.173.127
183	10.42.173.128/26	10.42.173.129 – 10.42.173.190	10.42.173.191
184	10.42.173.192/26	10.42.173.193 – 10.42.173.254	10.42.173.255
185	10.42.174.0/26	10.42.174.1 – 10.42.174.62	10.42.174.63
186	10.42.174.64/26	10.42.174.65 – 10.42.174.126	10.42.174.127
187	10.42.174.128/26	10.42.174.129 – 10.42.174.190	10.42.174.191
188	10.42.174.192/26	10.42.174.193 – 10.42.174.254	10.42.174.255
189	10.42.175.0/26	10.42.175.1 – 10.42.175.62	10.42.175.63
190	10.42.175.64/26	10.42.175.65 – 10.42.175.126	10.42.175.127
191	10.42.175.128/26	10.42.175.129 – 10.42.175.190	10.42.175.191
192	10.42.175.192/26	10.42.175.193 – 10.42.175.254	10.42.175.255
193	10.42.176.0/26	10.42.176.1 – 10.42.176.62	10.42.176.63
194	10.42.176.64/26	10.42.176.65 – 10.42.176.126	10.42.176.127
195	10.42.176.128/26	10.42.176.129 – 10.42.176.190	10.42.176.191
196	10.42.176.192/26	10.42.176.193 – 10.42.176.254	10.42.176.255
197	10.42.177.0/26	10.42.177.1 – 10.42.177.62	10.42.177.63
198	10.42.177.64/26	10.42.177.65 – 10.42.177.126	10.42.177.127
199	10.42.177.128/26	10.42.177.129 – 10.42.177.190	10.42.177.191
200	10.42.177.192/26	10.42.177.193 – 10.42.177.254	10.42.177.255
201	10.42.178.0/26	10.42.178.1 – 10.42.178.62	10.42.178.63
202	10.42.178.64/26	10.42.178.65 – 10.42.178.126	10.42.178.127
203	10.42.178.128/26	10.42.178.129 – 10.42.178.190	10.42.178.191
204	10.42.178.192/26	10.42.178.193 – 10.42.178.254	10.42.178.255
205	10.42.179.0/26	10.42.179.1 – 10.42.179.62	10.42.179.63
206	10.42.179.64/26	10.42.179.65 – 10.42.179.126	10.42.179.127
207	10.42.179.128/26	10.42.179.129 – 10.42.179.190	10.42.179.191
208	10.42.179.192/26	10.42.179.193 – 10.42.179.254	10.42.179.255
209	10.42.180.0/26	10.42.180.1 – 10.42.180.62	10.42.180.63
210	10.42.180.64/26	10.42.180.65 – 10.42.180.126	10.42.180.127
211	10.42.180.128/26	10.42.180.129 – 10.42.180.190	10.42.180.191
212	10.42.180.192/26	10.42.180.193 – 10.42.180.254	10.42.180.255
213	10.42.181.0/26	10.42.181.1 – 10.42.181.62	10.42.181.63
214	10.42.181.64/26	10.42.181.65 – 10.42.181.126	10.42.181.127
215	10.42.181.128/26	10.42.181.129 – 10.42.181.190	10.42.181.191
216	10.42.181.192/26	10.42.181.193 – 10.42.181.254	10.42.181.255
217	10.42.182.0/26	10.42.182.1 – 10.42.182.62	10.42.182.63
218	10.42.182.64/26	10.42.182.65 – 10.42.182.126	10.42.182.127
219	10.42.182.128/26	10.42.182.129 – 10.42.182.190	10.42.182.191
220	10.42.182.192/26	10.42.182.193 – 10.42.182.254	10.42.182.255
221	10.42.183.0/26	10.42.183.1 – 10.42.183.62	10.42.183.63
222	10.42.183.64/26	10.42.183.65 – 10.42.183.126	10.42.183.127
223	10.42.183.128/26	10.42.183.129 – 10.42.183.190	10.42.183.191
224	10.42.183.192/26	10.42.183.193 – 10.42.183.254	10.42.183.255
225	10.42.184.0/26	10.42.184.1 – 10.42.184.62	10.42.184.63
226	10.42.184.64/26	10.42.184.65 – 10.42.184.126	10.42.184.127
227	10.42.184.128/26	10.42.184.129 – 10.42.184.190	10.42.184.191
228	10.42.184.192/26	10.42.184.193 – 10.42.184.254	10.42.184.255
229	10.42.185.0/26	10.42.185.1 – 10.42.185.62	10.42.185.63
230	10.42.185.64/26	10.42.185.65 – 10.42.185.126	10.42.185.127
231	10.42.185.128/26	10.42.185.129 – 10.42.185.190	10.42.185.191
232	10.42.185.192/26	10.42.185.193 – 10.42.185.254	10.42.185.255
233	10.42.186.0/26	10.42.186.1 – 10.42.186.62	10.42.186.63
234	10.42.186.64/26	10.42.186.65 – 10.42.186.126	10.42.186.127
235	10.42.186.128/26	10.42.186.129 – 10.42.186.190	10.42.186.191
236	10.42.186.192/26	10.42.186.193 – 10.42.186.254	10.42.186.255
237	10.42.187.0/26	10.42.187.1 – 10.42.187.62	10.42.187.63
238	10.42.187.64/26	10.42.187.65 – 10.42.187.126	10.42.187.127
239	10.42.187.128/26	10.42.187.129 – 10.42.187.190	10.42.187.191
240	10.42.187.192/26	10.42.187.193 – 10.42.187.254	10.42.187.255
241	10.42.188.0/26	10.42.188.1 – 10.42.188.62	10.42.188.63
242	10.42.188.64/26	10.42.188.65 – 10.42.188.126	10.42.188.127
243	10.42.188.128/26	10.42.188.129 – 10.42.188.190	10.42.188.191
244	10.42.188.192/26	10.42.188.193 – 10.42.188.254	10.42.188.255
245	10.42.189.0/26	10.42.189.1 – 10.42.189.62	10.42.189.63
246	10.42.189.64/26	10.42.189.65 – 10.42.189.126	10.42.189.127
247	10.42.189.128/26	10.42.189.129 – 10.42.189.190	10.42.189.191
248	10.42.189.192/26	10.42.189.193 – 10.42.189.254	10.42.189.255
249	10.42.190.0/26	10.42.190.1 – 10.42.190.62	10.42.190.63
250	10.42.190.64/26	10.42.190.65 – 10.42.190.126	10.42.190.127
251	10.42.190.128/26	10.42.190.129 – 10.42.190.190	10.42.190.191
252	10.42.190.192/26	10.42.190.193 – 10.42.190.254	10.42.190.255
253	10.42.191.0/26	10.42.191.1 – 10.42.191.62	10.42.191.63
254	10.42.191.64/26	10.42.191.65 – 10.42.191.126	10.42.191.127
255	10.42.191.128/26	10.42.191.129 – 10.42.191.190	10.42.191.191
256	10.42.191.192/26	10.42.191.193 – 10.42.191.254	10.42.191.255

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 →