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)10.30.128.0/18

network10.30.128.0/18

broadcast10.30.191.255

first host10.30.128.1

last host10.30.191.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.30.128.0/18

address00001010.00011110.10000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00011110.10000000.00000000

broadcast00001010.00011110.10111111.11111111

green = network part, grey = host part

hex0x0a1e8000

decimal169771008

reverse dns0.128.30.10.in-addr.arpa

ipv4-mapped::ffff:a1e:8000

/18 split into /27 · 512 subnets

close ×

#	network	host range	broadcast
1	10.30.128.0/27	10.30.128.1 – 10.30.128.30	10.30.128.31
2	10.30.128.32/27	10.30.128.33 – 10.30.128.62	10.30.128.63
3	10.30.128.64/27	10.30.128.65 – 10.30.128.94	10.30.128.95
4	10.30.128.96/27	10.30.128.97 – 10.30.128.126	10.30.128.127
5	10.30.128.128/27	10.30.128.129 – 10.30.128.158	10.30.128.159
6	10.30.128.160/27	10.30.128.161 – 10.30.128.190	10.30.128.191
7	10.30.128.192/27	10.30.128.193 – 10.30.128.222	10.30.128.223
8	10.30.128.224/27	10.30.128.225 – 10.30.128.254	10.30.128.255
9	10.30.129.0/27	10.30.129.1 – 10.30.129.30	10.30.129.31
10	10.30.129.32/27	10.30.129.33 – 10.30.129.62	10.30.129.63
11	10.30.129.64/27	10.30.129.65 – 10.30.129.94	10.30.129.95
12	10.30.129.96/27	10.30.129.97 – 10.30.129.126	10.30.129.127
13	10.30.129.128/27	10.30.129.129 – 10.30.129.158	10.30.129.159
14	10.30.129.160/27	10.30.129.161 – 10.30.129.190	10.30.129.191
15	10.30.129.192/27	10.30.129.193 – 10.30.129.222	10.30.129.223
16	10.30.129.224/27	10.30.129.225 – 10.30.129.254	10.30.129.255
17	10.30.130.0/27	10.30.130.1 – 10.30.130.30	10.30.130.31
18	10.30.130.32/27	10.30.130.33 – 10.30.130.62	10.30.130.63
19	10.30.130.64/27	10.30.130.65 – 10.30.130.94	10.30.130.95
20	10.30.130.96/27	10.30.130.97 – 10.30.130.126	10.30.130.127
21	10.30.130.128/27	10.30.130.129 – 10.30.130.158	10.30.130.159
22	10.30.130.160/27	10.30.130.161 – 10.30.130.190	10.30.130.191
23	10.30.130.192/27	10.30.130.193 – 10.30.130.222	10.30.130.223
24	10.30.130.224/27	10.30.130.225 – 10.30.130.254	10.30.130.255
25	10.30.131.0/27	10.30.131.1 – 10.30.131.30	10.30.131.31
26	10.30.131.32/27	10.30.131.33 – 10.30.131.62	10.30.131.63
27	10.30.131.64/27	10.30.131.65 – 10.30.131.94	10.30.131.95
28	10.30.131.96/27	10.30.131.97 – 10.30.131.126	10.30.131.127
29	10.30.131.128/27	10.30.131.129 – 10.30.131.158	10.30.131.159
30	10.30.131.160/27	10.30.131.161 – 10.30.131.190	10.30.131.191
31	10.30.131.192/27	10.30.131.193 – 10.30.131.222	10.30.131.223
32	10.30.131.224/27	10.30.131.225 – 10.30.131.254	10.30.131.255
33	10.30.132.0/27	10.30.132.1 – 10.30.132.30	10.30.132.31
34	10.30.132.32/27	10.30.132.33 – 10.30.132.62	10.30.132.63
35	10.30.132.64/27	10.30.132.65 – 10.30.132.94	10.30.132.95
36	10.30.132.96/27	10.30.132.97 – 10.30.132.126	10.30.132.127
37	10.30.132.128/27	10.30.132.129 – 10.30.132.158	10.30.132.159
38	10.30.132.160/27	10.30.132.161 – 10.30.132.190	10.30.132.191
39	10.30.132.192/27	10.30.132.193 – 10.30.132.222	10.30.132.223
40	10.30.132.224/27	10.30.132.225 – 10.30.132.254	10.30.132.255
41	10.30.133.0/27	10.30.133.1 – 10.30.133.30	10.30.133.31
42	10.30.133.32/27	10.30.133.33 – 10.30.133.62	10.30.133.63
43	10.30.133.64/27	10.30.133.65 – 10.30.133.94	10.30.133.95
44	10.30.133.96/27	10.30.133.97 – 10.30.133.126	10.30.133.127
45	10.30.133.128/27	10.30.133.129 – 10.30.133.158	10.30.133.159
46	10.30.133.160/27	10.30.133.161 – 10.30.133.190	10.30.133.191
47	10.30.133.192/27	10.30.133.193 – 10.30.133.222	10.30.133.223
48	10.30.133.224/27	10.30.133.225 – 10.30.133.254	10.30.133.255
49	10.30.134.0/27	10.30.134.1 – 10.30.134.30	10.30.134.31
50	10.30.134.32/27	10.30.134.33 – 10.30.134.62	10.30.134.63
51	10.30.134.64/27	10.30.134.65 – 10.30.134.94	10.30.134.95
52	10.30.134.96/27	10.30.134.97 – 10.30.134.126	10.30.134.127
53	10.30.134.128/27	10.30.134.129 – 10.30.134.158	10.30.134.159
54	10.30.134.160/27	10.30.134.161 – 10.30.134.190	10.30.134.191
55	10.30.134.192/27	10.30.134.193 – 10.30.134.222	10.30.134.223
56	10.30.134.224/27	10.30.134.225 – 10.30.134.254	10.30.134.255
57	10.30.135.0/27	10.30.135.1 – 10.30.135.30	10.30.135.31
58	10.30.135.32/27	10.30.135.33 – 10.30.135.62	10.30.135.63
59	10.30.135.64/27	10.30.135.65 – 10.30.135.94	10.30.135.95
60	10.30.135.96/27	10.30.135.97 – 10.30.135.126	10.30.135.127
61	10.30.135.128/27	10.30.135.129 – 10.30.135.158	10.30.135.159
62	10.30.135.160/27	10.30.135.161 – 10.30.135.190	10.30.135.191
63	10.30.135.192/27	10.30.135.193 – 10.30.135.222	10.30.135.223
64	10.30.135.224/27	10.30.135.225 – 10.30.135.254	10.30.135.255
65	10.30.136.0/27	10.30.136.1 – 10.30.136.30	10.30.136.31
66	10.30.136.32/27	10.30.136.33 – 10.30.136.62	10.30.136.63
67	10.30.136.64/27	10.30.136.65 – 10.30.136.94	10.30.136.95
68	10.30.136.96/27	10.30.136.97 – 10.30.136.126	10.30.136.127
69	10.30.136.128/27	10.30.136.129 – 10.30.136.158	10.30.136.159
70	10.30.136.160/27	10.30.136.161 – 10.30.136.190	10.30.136.191
71	10.30.136.192/27	10.30.136.193 – 10.30.136.222	10.30.136.223
72	10.30.136.224/27	10.30.136.225 – 10.30.136.254	10.30.136.255
73	10.30.137.0/27	10.30.137.1 – 10.30.137.30	10.30.137.31
74	10.30.137.32/27	10.30.137.33 – 10.30.137.62	10.30.137.63
75	10.30.137.64/27	10.30.137.65 – 10.30.137.94	10.30.137.95
76	10.30.137.96/27	10.30.137.97 – 10.30.137.126	10.30.137.127
77	10.30.137.128/27	10.30.137.129 – 10.30.137.158	10.30.137.159
78	10.30.137.160/27	10.30.137.161 – 10.30.137.190	10.30.137.191
79	10.30.137.192/27	10.30.137.193 – 10.30.137.222	10.30.137.223
80	10.30.137.224/27	10.30.137.225 – 10.30.137.254	10.30.137.255
81	10.30.138.0/27	10.30.138.1 – 10.30.138.30	10.30.138.31
82	10.30.138.32/27	10.30.138.33 – 10.30.138.62	10.30.138.63
83	10.30.138.64/27	10.30.138.65 – 10.30.138.94	10.30.138.95
84	10.30.138.96/27	10.30.138.97 – 10.30.138.126	10.30.138.127
85	10.30.138.128/27	10.30.138.129 – 10.30.138.158	10.30.138.159
86	10.30.138.160/27	10.30.138.161 – 10.30.138.190	10.30.138.191
87	10.30.138.192/27	10.30.138.193 – 10.30.138.222	10.30.138.223
88	10.30.138.224/27	10.30.138.225 – 10.30.138.254	10.30.138.255
89	10.30.139.0/27	10.30.139.1 – 10.30.139.30	10.30.139.31
90	10.30.139.32/27	10.30.139.33 – 10.30.139.62	10.30.139.63
91	10.30.139.64/27	10.30.139.65 – 10.30.139.94	10.30.139.95
92	10.30.139.96/27	10.30.139.97 – 10.30.139.126	10.30.139.127
93	10.30.139.128/27	10.30.139.129 – 10.30.139.158	10.30.139.159
94	10.30.139.160/27	10.30.139.161 – 10.30.139.190	10.30.139.191
95	10.30.139.192/27	10.30.139.193 – 10.30.139.222	10.30.139.223
96	10.30.139.224/27	10.30.139.225 – 10.30.139.254	10.30.139.255
97	10.30.140.0/27	10.30.140.1 – 10.30.140.30	10.30.140.31
98	10.30.140.32/27	10.30.140.33 – 10.30.140.62	10.30.140.63
99	10.30.140.64/27	10.30.140.65 – 10.30.140.94	10.30.140.95
100	10.30.140.96/27	10.30.140.97 – 10.30.140.126	10.30.140.127
101	10.30.140.128/27	10.30.140.129 – 10.30.140.158	10.30.140.159
102	10.30.140.160/27	10.30.140.161 – 10.30.140.190	10.30.140.191
103	10.30.140.192/27	10.30.140.193 – 10.30.140.222	10.30.140.223
104	10.30.140.224/27	10.30.140.225 – 10.30.140.254	10.30.140.255
105	10.30.141.0/27	10.30.141.1 – 10.30.141.30	10.30.141.31
106	10.30.141.32/27	10.30.141.33 – 10.30.141.62	10.30.141.63
107	10.30.141.64/27	10.30.141.65 – 10.30.141.94	10.30.141.95
108	10.30.141.96/27	10.30.141.97 – 10.30.141.126	10.30.141.127
109	10.30.141.128/27	10.30.141.129 – 10.30.141.158	10.30.141.159
110	10.30.141.160/27	10.30.141.161 – 10.30.141.190	10.30.141.191
111	10.30.141.192/27	10.30.141.193 – 10.30.141.222	10.30.141.223
112	10.30.141.224/27	10.30.141.225 – 10.30.141.254	10.30.141.255
113	10.30.142.0/27	10.30.142.1 – 10.30.142.30	10.30.142.31
114	10.30.142.32/27	10.30.142.33 – 10.30.142.62	10.30.142.63
115	10.30.142.64/27	10.30.142.65 – 10.30.142.94	10.30.142.95
116	10.30.142.96/27	10.30.142.97 – 10.30.142.126	10.30.142.127
117	10.30.142.128/27	10.30.142.129 – 10.30.142.158	10.30.142.159
118	10.30.142.160/27	10.30.142.161 – 10.30.142.190	10.30.142.191
119	10.30.142.192/27	10.30.142.193 – 10.30.142.222	10.30.142.223
120	10.30.142.224/27	10.30.142.225 – 10.30.142.254	10.30.142.255
121	10.30.143.0/27	10.30.143.1 – 10.30.143.30	10.30.143.31
122	10.30.143.32/27	10.30.143.33 – 10.30.143.62	10.30.143.63
123	10.30.143.64/27	10.30.143.65 – 10.30.143.94	10.30.143.95
124	10.30.143.96/27	10.30.143.97 – 10.30.143.126	10.30.143.127
125	10.30.143.128/27	10.30.143.129 – 10.30.143.158	10.30.143.159
126	10.30.143.160/27	10.30.143.161 – 10.30.143.190	10.30.143.191
127	10.30.143.192/27	10.30.143.193 – 10.30.143.222	10.30.143.223
128	10.30.143.224/27	10.30.143.225 – 10.30.143.254	10.30.143.255
129	10.30.144.0/27	10.30.144.1 – 10.30.144.30	10.30.144.31
130	10.30.144.32/27	10.30.144.33 – 10.30.144.62	10.30.144.63
131	10.30.144.64/27	10.30.144.65 – 10.30.144.94	10.30.144.95
132	10.30.144.96/27	10.30.144.97 – 10.30.144.126	10.30.144.127
133	10.30.144.128/27	10.30.144.129 – 10.30.144.158	10.30.144.159
134	10.30.144.160/27	10.30.144.161 – 10.30.144.190	10.30.144.191
135	10.30.144.192/27	10.30.144.193 – 10.30.144.222	10.30.144.223
136	10.30.144.224/27	10.30.144.225 – 10.30.144.254	10.30.144.255
137	10.30.145.0/27	10.30.145.1 – 10.30.145.30	10.30.145.31
138	10.30.145.32/27	10.30.145.33 – 10.30.145.62	10.30.145.63
139	10.30.145.64/27	10.30.145.65 – 10.30.145.94	10.30.145.95
140	10.30.145.96/27	10.30.145.97 – 10.30.145.126	10.30.145.127
141	10.30.145.128/27	10.30.145.129 – 10.30.145.158	10.30.145.159
142	10.30.145.160/27	10.30.145.161 – 10.30.145.190	10.30.145.191
143	10.30.145.192/27	10.30.145.193 – 10.30.145.222	10.30.145.223
144	10.30.145.224/27	10.30.145.225 – 10.30.145.254	10.30.145.255
145	10.30.146.0/27	10.30.146.1 – 10.30.146.30	10.30.146.31
146	10.30.146.32/27	10.30.146.33 – 10.30.146.62	10.30.146.63
147	10.30.146.64/27	10.30.146.65 – 10.30.146.94	10.30.146.95
148	10.30.146.96/27	10.30.146.97 – 10.30.146.126	10.30.146.127
149	10.30.146.128/27	10.30.146.129 – 10.30.146.158	10.30.146.159
150	10.30.146.160/27	10.30.146.161 – 10.30.146.190	10.30.146.191
151	10.30.146.192/27	10.30.146.193 – 10.30.146.222	10.30.146.223
152	10.30.146.224/27	10.30.146.225 – 10.30.146.254	10.30.146.255
153	10.30.147.0/27	10.30.147.1 – 10.30.147.30	10.30.147.31
154	10.30.147.32/27	10.30.147.33 – 10.30.147.62	10.30.147.63
155	10.30.147.64/27	10.30.147.65 – 10.30.147.94	10.30.147.95
156	10.30.147.96/27	10.30.147.97 – 10.30.147.126	10.30.147.127
157	10.30.147.128/27	10.30.147.129 – 10.30.147.158	10.30.147.159
158	10.30.147.160/27	10.30.147.161 – 10.30.147.190	10.30.147.191
159	10.30.147.192/27	10.30.147.193 – 10.30.147.222	10.30.147.223
160	10.30.147.224/27	10.30.147.225 – 10.30.147.254	10.30.147.255
161	10.30.148.0/27	10.30.148.1 – 10.30.148.30	10.30.148.31
162	10.30.148.32/27	10.30.148.33 – 10.30.148.62	10.30.148.63
163	10.30.148.64/27	10.30.148.65 – 10.30.148.94	10.30.148.95
164	10.30.148.96/27	10.30.148.97 – 10.30.148.126	10.30.148.127
165	10.30.148.128/27	10.30.148.129 – 10.30.148.158	10.30.148.159
166	10.30.148.160/27	10.30.148.161 – 10.30.148.190	10.30.148.191
167	10.30.148.192/27	10.30.148.193 – 10.30.148.222	10.30.148.223
168	10.30.148.224/27	10.30.148.225 – 10.30.148.254	10.30.148.255
169	10.30.149.0/27	10.30.149.1 – 10.30.149.30	10.30.149.31
170	10.30.149.32/27	10.30.149.33 – 10.30.149.62	10.30.149.63
171	10.30.149.64/27	10.30.149.65 – 10.30.149.94	10.30.149.95
172	10.30.149.96/27	10.30.149.97 – 10.30.149.126	10.30.149.127
173	10.30.149.128/27	10.30.149.129 – 10.30.149.158	10.30.149.159
174	10.30.149.160/27	10.30.149.161 – 10.30.149.190	10.30.149.191
175	10.30.149.192/27	10.30.149.193 – 10.30.149.222	10.30.149.223
176	10.30.149.224/27	10.30.149.225 – 10.30.149.254	10.30.149.255
177	10.30.150.0/27	10.30.150.1 – 10.30.150.30	10.30.150.31
178	10.30.150.32/27	10.30.150.33 – 10.30.150.62	10.30.150.63
179	10.30.150.64/27	10.30.150.65 – 10.30.150.94	10.30.150.95
180	10.30.150.96/27	10.30.150.97 – 10.30.150.126	10.30.150.127
181	10.30.150.128/27	10.30.150.129 – 10.30.150.158	10.30.150.159
182	10.30.150.160/27	10.30.150.161 – 10.30.150.190	10.30.150.191
183	10.30.150.192/27	10.30.150.193 – 10.30.150.222	10.30.150.223
184	10.30.150.224/27	10.30.150.225 – 10.30.150.254	10.30.150.255
185	10.30.151.0/27	10.30.151.1 – 10.30.151.30	10.30.151.31
186	10.30.151.32/27	10.30.151.33 – 10.30.151.62	10.30.151.63
187	10.30.151.64/27	10.30.151.65 – 10.30.151.94	10.30.151.95
188	10.30.151.96/27	10.30.151.97 – 10.30.151.126	10.30.151.127
189	10.30.151.128/27	10.30.151.129 – 10.30.151.158	10.30.151.159
190	10.30.151.160/27	10.30.151.161 – 10.30.151.190	10.30.151.191
191	10.30.151.192/27	10.30.151.193 – 10.30.151.222	10.30.151.223
192	10.30.151.224/27	10.30.151.225 – 10.30.151.254	10.30.151.255
193	10.30.152.0/27	10.30.152.1 – 10.30.152.30	10.30.152.31
194	10.30.152.32/27	10.30.152.33 – 10.30.152.62	10.30.152.63
195	10.30.152.64/27	10.30.152.65 – 10.30.152.94	10.30.152.95
196	10.30.152.96/27	10.30.152.97 – 10.30.152.126	10.30.152.127
197	10.30.152.128/27	10.30.152.129 – 10.30.152.158	10.30.152.159
198	10.30.152.160/27	10.30.152.161 – 10.30.152.190	10.30.152.191
199	10.30.152.192/27	10.30.152.193 – 10.30.152.222	10.30.152.223
200	10.30.152.224/27	10.30.152.225 – 10.30.152.254	10.30.152.255
201	10.30.153.0/27	10.30.153.1 – 10.30.153.30	10.30.153.31
202	10.30.153.32/27	10.30.153.33 – 10.30.153.62	10.30.153.63
203	10.30.153.64/27	10.30.153.65 – 10.30.153.94	10.30.153.95
204	10.30.153.96/27	10.30.153.97 – 10.30.153.126	10.30.153.127
205	10.30.153.128/27	10.30.153.129 – 10.30.153.158	10.30.153.159
206	10.30.153.160/27	10.30.153.161 – 10.30.153.190	10.30.153.191
207	10.30.153.192/27	10.30.153.193 – 10.30.153.222	10.30.153.223
208	10.30.153.224/27	10.30.153.225 – 10.30.153.254	10.30.153.255
209	10.30.154.0/27	10.30.154.1 – 10.30.154.30	10.30.154.31
210	10.30.154.32/27	10.30.154.33 – 10.30.154.62	10.30.154.63
211	10.30.154.64/27	10.30.154.65 – 10.30.154.94	10.30.154.95
212	10.30.154.96/27	10.30.154.97 – 10.30.154.126	10.30.154.127
213	10.30.154.128/27	10.30.154.129 – 10.30.154.158	10.30.154.159
214	10.30.154.160/27	10.30.154.161 – 10.30.154.190	10.30.154.191
215	10.30.154.192/27	10.30.154.193 – 10.30.154.222	10.30.154.223
216	10.30.154.224/27	10.30.154.225 – 10.30.154.254	10.30.154.255
217	10.30.155.0/27	10.30.155.1 – 10.30.155.30	10.30.155.31
218	10.30.155.32/27	10.30.155.33 – 10.30.155.62	10.30.155.63
219	10.30.155.64/27	10.30.155.65 – 10.30.155.94	10.30.155.95
220	10.30.155.96/27	10.30.155.97 – 10.30.155.126	10.30.155.127
221	10.30.155.128/27	10.30.155.129 – 10.30.155.158	10.30.155.159
222	10.30.155.160/27	10.30.155.161 – 10.30.155.190	10.30.155.191
223	10.30.155.192/27	10.30.155.193 – 10.30.155.222	10.30.155.223
224	10.30.155.224/27	10.30.155.225 – 10.30.155.254	10.30.155.255
225	10.30.156.0/27	10.30.156.1 – 10.30.156.30	10.30.156.31
226	10.30.156.32/27	10.30.156.33 – 10.30.156.62	10.30.156.63
227	10.30.156.64/27	10.30.156.65 – 10.30.156.94	10.30.156.95
228	10.30.156.96/27	10.30.156.97 – 10.30.156.126	10.30.156.127
229	10.30.156.128/27	10.30.156.129 – 10.30.156.158	10.30.156.159
230	10.30.156.160/27	10.30.156.161 – 10.30.156.190	10.30.156.191
231	10.30.156.192/27	10.30.156.193 – 10.30.156.222	10.30.156.223
232	10.30.156.224/27	10.30.156.225 – 10.30.156.254	10.30.156.255
233	10.30.157.0/27	10.30.157.1 – 10.30.157.30	10.30.157.31
234	10.30.157.32/27	10.30.157.33 – 10.30.157.62	10.30.157.63
235	10.30.157.64/27	10.30.157.65 – 10.30.157.94	10.30.157.95
236	10.30.157.96/27	10.30.157.97 – 10.30.157.126	10.30.157.127
237	10.30.157.128/27	10.30.157.129 – 10.30.157.158	10.30.157.159
238	10.30.157.160/27	10.30.157.161 – 10.30.157.190	10.30.157.191
239	10.30.157.192/27	10.30.157.193 – 10.30.157.222	10.30.157.223
240	10.30.157.224/27	10.30.157.225 – 10.30.157.254	10.30.157.255
241	10.30.158.0/27	10.30.158.1 – 10.30.158.30	10.30.158.31
242	10.30.158.32/27	10.30.158.33 – 10.30.158.62	10.30.158.63
243	10.30.158.64/27	10.30.158.65 – 10.30.158.94	10.30.158.95
244	10.30.158.96/27	10.30.158.97 – 10.30.158.126	10.30.158.127
245	10.30.158.128/27	10.30.158.129 – 10.30.158.158	10.30.158.159
246	10.30.158.160/27	10.30.158.161 – 10.30.158.190	10.30.158.191
247	10.30.158.192/27	10.30.158.193 – 10.30.158.222	10.30.158.223
248	10.30.158.224/27	10.30.158.225 – 10.30.158.254	10.30.158.255
249	10.30.159.0/27	10.30.159.1 – 10.30.159.30	10.30.159.31
250	10.30.159.32/27	10.30.159.33 – 10.30.159.62	10.30.159.63
251	10.30.159.64/27	10.30.159.65 – 10.30.159.94	10.30.159.95
252	10.30.159.96/27	10.30.159.97 – 10.30.159.126	10.30.159.127
253	10.30.159.128/27	10.30.159.129 – 10.30.159.158	10.30.159.159
254	10.30.159.160/27	10.30.159.161 – 10.30.159.190	10.30.159.191
255	10.30.159.192/27	10.30.159.193 – 10.30.159.222	10.30.159.223
256	10.30.159.224/27	10.30.159.225 – 10.30.159.254	10.30.159.255

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 /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 →