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)10.17.128.0/19

network10.17.128.0/19

broadcast10.17.159.255

first host10.17.128.1

last host10.17.159.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.17.128.0/19

address00001010.00010001.10000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010001.10000000.00000000

broadcast00001010.00010001.10011111.11111111

green = network part, grey = host part

hex0x0a118000

decimal168919040

reverse dns0.128.17.10.in-addr.arpa

ipv4-mapped::ffff:a11:8000

/19 split into /27 · 256 subnets

close ×

#	network	host range	broadcast
1	10.17.128.0/27	10.17.128.1 – 10.17.128.30	10.17.128.31
2	10.17.128.32/27	10.17.128.33 – 10.17.128.62	10.17.128.63
3	10.17.128.64/27	10.17.128.65 – 10.17.128.94	10.17.128.95
4	10.17.128.96/27	10.17.128.97 – 10.17.128.126	10.17.128.127
5	10.17.128.128/27	10.17.128.129 – 10.17.128.158	10.17.128.159
6	10.17.128.160/27	10.17.128.161 – 10.17.128.190	10.17.128.191
7	10.17.128.192/27	10.17.128.193 – 10.17.128.222	10.17.128.223
8	10.17.128.224/27	10.17.128.225 – 10.17.128.254	10.17.128.255
9	10.17.129.0/27	10.17.129.1 – 10.17.129.30	10.17.129.31
10	10.17.129.32/27	10.17.129.33 – 10.17.129.62	10.17.129.63
11	10.17.129.64/27	10.17.129.65 – 10.17.129.94	10.17.129.95
12	10.17.129.96/27	10.17.129.97 – 10.17.129.126	10.17.129.127
13	10.17.129.128/27	10.17.129.129 – 10.17.129.158	10.17.129.159
14	10.17.129.160/27	10.17.129.161 – 10.17.129.190	10.17.129.191
15	10.17.129.192/27	10.17.129.193 – 10.17.129.222	10.17.129.223
16	10.17.129.224/27	10.17.129.225 – 10.17.129.254	10.17.129.255
17	10.17.130.0/27	10.17.130.1 – 10.17.130.30	10.17.130.31
18	10.17.130.32/27	10.17.130.33 – 10.17.130.62	10.17.130.63
19	10.17.130.64/27	10.17.130.65 – 10.17.130.94	10.17.130.95
20	10.17.130.96/27	10.17.130.97 – 10.17.130.126	10.17.130.127
21	10.17.130.128/27	10.17.130.129 – 10.17.130.158	10.17.130.159
22	10.17.130.160/27	10.17.130.161 – 10.17.130.190	10.17.130.191
23	10.17.130.192/27	10.17.130.193 – 10.17.130.222	10.17.130.223
24	10.17.130.224/27	10.17.130.225 – 10.17.130.254	10.17.130.255
25	10.17.131.0/27	10.17.131.1 – 10.17.131.30	10.17.131.31
26	10.17.131.32/27	10.17.131.33 – 10.17.131.62	10.17.131.63
27	10.17.131.64/27	10.17.131.65 – 10.17.131.94	10.17.131.95
28	10.17.131.96/27	10.17.131.97 – 10.17.131.126	10.17.131.127
29	10.17.131.128/27	10.17.131.129 – 10.17.131.158	10.17.131.159
30	10.17.131.160/27	10.17.131.161 – 10.17.131.190	10.17.131.191
31	10.17.131.192/27	10.17.131.193 – 10.17.131.222	10.17.131.223
32	10.17.131.224/27	10.17.131.225 – 10.17.131.254	10.17.131.255
33	10.17.132.0/27	10.17.132.1 – 10.17.132.30	10.17.132.31
34	10.17.132.32/27	10.17.132.33 – 10.17.132.62	10.17.132.63
35	10.17.132.64/27	10.17.132.65 – 10.17.132.94	10.17.132.95
36	10.17.132.96/27	10.17.132.97 – 10.17.132.126	10.17.132.127
37	10.17.132.128/27	10.17.132.129 – 10.17.132.158	10.17.132.159
38	10.17.132.160/27	10.17.132.161 – 10.17.132.190	10.17.132.191
39	10.17.132.192/27	10.17.132.193 – 10.17.132.222	10.17.132.223
40	10.17.132.224/27	10.17.132.225 – 10.17.132.254	10.17.132.255
41	10.17.133.0/27	10.17.133.1 – 10.17.133.30	10.17.133.31
42	10.17.133.32/27	10.17.133.33 – 10.17.133.62	10.17.133.63
43	10.17.133.64/27	10.17.133.65 – 10.17.133.94	10.17.133.95
44	10.17.133.96/27	10.17.133.97 – 10.17.133.126	10.17.133.127
45	10.17.133.128/27	10.17.133.129 – 10.17.133.158	10.17.133.159
46	10.17.133.160/27	10.17.133.161 – 10.17.133.190	10.17.133.191
47	10.17.133.192/27	10.17.133.193 – 10.17.133.222	10.17.133.223
48	10.17.133.224/27	10.17.133.225 – 10.17.133.254	10.17.133.255
49	10.17.134.0/27	10.17.134.1 – 10.17.134.30	10.17.134.31
50	10.17.134.32/27	10.17.134.33 – 10.17.134.62	10.17.134.63
51	10.17.134.64/27	10.17.134.65 – 10.17.134.94	10.17.134.95
52	10.17.134.96/27	10.17.134.97 – 10.17.134.126	10.17.134.127
53	10.17.134.128/27	10.17.134.129 – 10.17.134.158	10.17.134.159
54	10.17.134.160/27	10.17.134.161 – 10.17.134.190	10.17.134.191
55	10.17.134.192/27	10.17.134.193 – 10.17.134.222	10.17.134.223
56	10.17.134.224/27	10.17.134.225 – 10.17.134.254	10.17.134.255
57	10.17.135.0/27	10.17.135.1 – 10.17.135.30	10.17.135.31
58	10.17.135.32/27	10.17.135.33 – 10.17.135.62	10.17.135.63
59	10.17.135.64/27	10.17.135.65 – 10.17.135.94	10.17.135.95
60	10.17.135.96/27	10.17.135.97 – 10.17.135.126	10.17.135.127
61	10.17.135.128/27	10.17.135.129 – 10.17.135.158	10.17.135.159
62	10.17.135.160/27	10.17.135.161 – 10.17.135.190	10.17.135.191
63	10.17.135.192/27	10.17.135.193 – 10.17.135.222	10.17.135.223
64	10.17.135.224/27	10.17.135.225 – 10.17.135.254	10.17.135.255
65	10.17.136.0/27	10.17.136.1 – 10.17.136.30	10.17.136.31
66	10.17.136.32/27	10.17.136.33 – 10.17.136.62	10.17.136.63
67	10.17.136.64/27	10.17.136.65 – 10.17.136.94	10.17.136.95
68	10.17.136.96/27	10.17.136.97 – 10.17.136.126	10.17.136.127
69	10.17.136.128/27	10.17.136.129 – 10.17.136.158	10.17.136.159
70	10.17.136.160/27	10.17.136.161 – 10.17.136.190	10.17.136.191
71	10.17.136.192/27	10.17.136.193 – 10.17.136.222	10.17.136.223
72	10.17.136.224/27	10.17.136.225 – 10.17.136.254	10.17.136.255
73	10.17.137.0/27	10.17.137.1 – 10.17.137.30	10.17.137.31
74	10.17.137.32/27	10.17.137.33 – 10.17.137.62	10.17.137.63
75	10.17.137.64/27	10.17.137.65 – 10.17.137.94	10.17.137.95
76	10.17.137.96/27	10.17.137.97 – 10.17.137.126	10.17.137.127
77	10.17.137.128/27	10.17.137.129 – 10.17.137.158	10.17.137.159
78	10.17.137.160/27	10.17.137.161 – 10.17.137.190	10.17.137.191
79	10.17.137.192/27	10.17.137.193 – 10.17.137.222	10.17.137.223
80	10.17.137.224/27	10.17.137.225 – 10.17.137.254	10.17.137.255
81	10.17.138.0/27	10.17.138.1 – 10.17.138.30	10.17.138.31
82	10.17.138.32/27	10.17.138.33 – 10.17.138.62	10.17.138.63
83	10.17.138.64/27	10.17.138.65 – 10.17.138.94	10.17.138.95
84	10.17.138.96/27	10.17.138.97 – 10.17.138.126	10.17.138.127
85	10.17.138.128/27	10.17.138.129 – 10.17.138.158	10.17.138.159
86	10.17.138.160/27	10.17.138.161 – 10.17.138.190	10.17.138.191
87	10.17.138.192/27	10.17.138.193 – 10.17.138.222	10.17.138.223
88	10.17.138.224/27	10.17.138.225 – 10.17.138.254	10.17.138.255
89	10.17.139.0/27	10.17.139.1 – 10.17.139.30	10.17.139.31
90	10.17.139.32/27	10.17.139.33 – 10.17.139.62	10.17.139.63
91	10.17.139.64/27	10.17.139.65 – 10.17.139.94	10.17.139.95
92	10.17.139.96/27	10.17.139.97 – 10.17.139.126	10.17.139.127
93	10.17.139.128/27	10.17.139.129 – 10.17.139.158	10.17.139.159
94	10.17.139.160/27	10.17.139.161 – 10.17.139.190	10.17.139.191
95	10.17.139.192/27	10.17.139.193 – 10.17.139.222	10.17.139.223
96	10.17.139.224/27	10.17.139.225 – 10.17.139.254	10.17.139.255
97	10.17.140.0/27	10.17.140.1 – 10.17.140.30	10.17.140.31
98	10.17.140.32/27	10.17.140.33 – 10.17.140.62	10.17.140.63
99	10.17.140.64/27	10.17.140.65 – 10.17.140.94	10.17.140.95
100	10.17.140.96/27	10.17.140.97 – 10.17.140.126	10.17.140.127
101	10.17.140.128/27	10.17.140.129 – 10.17.140.158	10.17.140.159
102	10.17.140.160/27	10.17.140.161 – 10.17.140.190	10.17.140.191
103	10.17.140.192/27	10.17.140.193 – 10.17.140.222	10.17.140.223
104	10.17.140.224/27	10.17.140.225 – 10.17.140.254	10.17.140.255
105	10.17.141.0/27	10.17.141.1 – 10.17.141.30	10.17.141.31
106	10.17.141.32/27	10.17.141.33 – 10.17.141.62	10.17.141.63
107	10.17.141.64/27	10.17.141.65 – 10.17.141.94	10.17.141.95
108	10.17.141.96/27	10.17.141.97 – 10.17.141.126	10.17.141.127
109	10.17.141.128/27	10.17.141.129 – 10.17.141.158	10.17.141.159
110	10.17.141.160/27	10.17.141.161 – 10.17.141.190	10.17.141.191
111	10.17.141.192/27	10.17.141.193 – 10.17.141.222	10.17.141.223
112	10.17.141.224/27	10.17.141.225 – 10.17.141.254	10.17.141.255
113	10.17.142.0/27	10.17.142.1 – 10.17.142.30	10.17.142.31
114	10.17.142.32/27	10.17.142.33 – 10.17.142.62	10.17.142.63
115	10.17.142.64/27	10.17.142.65 – 10.17.142.94	10.17.142.95
116	10.17.142.96/27	10.17.142.97 – 10.17.142.126	10.17.142.127
117	10.17.142.128/27	10.17.142.129 – 10.17.142.158	10.17.142.159
118	10.17.142.160/27	10.17.142.161 – 10.17.142.190	10.17.142.191
119	10.17.142.192/27	10.17.142.193 – 10.17.142.222	10.17.142.223
120	10.17.142.224/27	10.17.142.225 – 10.17.142.254	10.17.142.255
121	10.17.143.0/27	10.17.143.1 – 10.17.143.30	10.17.143.31
122	10.17.143.32/27	10.17.143.33 – 10.17.143.62	10.17.143.63
123	10.17.143.64/27	10.17.143.65 – 10.17.143.94	10.17.143.95
124	10.17.143.96/27	10.17.143.97 – 10.17.143.126	10.17.143.127
125	10.17.143.128/27	10.17.143.129 – 10.17.143.158	10.17.143.159
126	10.17.143.160/27	10.17.143.161 – 10.17.143.190	10.17.143.191
127	10.17.143.192/27	10.17.143.193 – 10.17.143.222	10.17.143.223
128	10.17.143.224/27	10.17.143.225 – 10.17.143.254	10.17.143.255
129	10.17.144.0/27	10.17.144.1 – 10.17.144.30	10.17.144.31
130	10.17.144.32/27	10.17.144.33 – 10.17.144.62	10.17.144.63
131	10.17.144.64/27	10.17.144.65 – 10.17.144.94	10.17.144.95
132	10.17.144.96/27	10.17.144.97 – 10.17.144.126	10.17.144.127
133	10.17.144.128/27	10.17.144.129 – 10.17.144.158	10.17.144.159
134	10.17.144.160/27	10.17.144.161 – 10.17.144.190	10.17.144.191
135	10.17.144.192/27	10.17.144.193 – 10.17.144.222	10.17.144.223
136	10.17.144.224/27	10.17.144.225 – 10.17.144.254	10.17.144.255
137	10.17.145.0/27	10.17.145.1 – 10.17.145.30	10.17.145.31
138	10.17.145.32/27	10.17.145.33 – 10.17.145.62	10.17.145.63
139	10.17.145.64/27	10.17.145.65 – 10.17.145.94	10.17.145.95
140	10.17.145.96/27	10.17.145.97 – 10.17.145.126	10.17.145.127
141	10.17.145.128/27	10.17.145.129 – 10.17.145.158	10.17.145.159
142	10.17.145.160/27	10.17.145.161 – 10.17.145.190	10.17.145.191
143	10.17.145.192/27	10.17.145.193 – 10.17.145.222	10.17.145.223
144	10.17.145.224/27	10.17.145.225 – 10.17.145.254	10.17.145.255
145	10.17.146.0/27	10.17.146.1 – 10.17.146.30	10.17.146.31
146	10.17.146.32/27	10.17.146.33 – 10.17.146.62	10.17.146.63
147	10.17.146.64/27	10.17.146.65 – 10.17.146.94	10.17.146.95
148	10.17.146.96/27	10.17.146.97 – 10.17.146.126	10.17.146.127
149	10.17.146.128/27	10.17.146.129 – 10.17.146.158	10.17.146.159
150	10.17.146.160/27	10.17.146.161 – 10.17.146.190	10.17.146.191
151	10.17.146.192/27	10.17.146.193 – 10.17.146.222	10.17.146.223
152	10.17.146.224/27	10.17.146.225 – 10.17.146.254	10.17.146.255
153	10.17.147.0/27	10.17.147.1 – 10.17.147.30	10.17.147.31
154	10.17.147.32/27	10.17.147.33 – 10.17.147.62	10.17.147.63
155	10.17.147.64/27	10.17.147.65 – 10.17.147.94	10.17.147.95
156	10.17.147.96/27	10.17.147.97 – 10.17.147.126	10.17.147.127
157	10.17.147.128/27	10.17.147.129 – 10.17.147.158	10.17.147.159
158	10.17.147.160/27	10.17.147.161 – 10.17.147.190	10.17.147.191
159	10.17.147.192/27	10.17.147.193 – 10.17.147.222	10.17.147.223
160	10.17.147.224/27	10.17.147.225 – 10.17.147.254	10.17.147.255
161	10.17.148.0/27	10.17.148.1 – 10.17.148.30	10.17.148.31
162	10.17.148.32/27	10.17.148.33 – 10.17.148.62	10.17.148.63
163	10.17.148.64/27	10.17.148.65 – 10.17.148.94	10.17.148.95
164	10.17.148.96/27	10.17.148.97 – 10.17.148.126	10.17.148.127
165	10.17.148.128/27	10.17.148.129 – 10.17.148.158	10.17.148.159
166	10.17.148.160/27	10.17.148.161 – 10.17.148.190	10.17.148.191
167	10.17.148.192/27	10.17.148.193 – 10.17.148.222	10.17.148.223
168	10.17.148.224/27	10.17.148.225 – 10.17.148.254	10.17.148.255
169	10.17.149.0/27	10.17.149.1 – 10.17.149.30	10.17.149.31
170	10.17.149.32/27	10.17.149.33 – 10.17.149.62	10.17.149.63
171	10.17.149.64/27	10.17.149.65 – 10.17.149.94	10.17.149.95
172	10.17.149.96/27	10.17.149.97 – 10.17.149.126	10.17.149.127
173	10.17.149.128/27	10.17.149.129 – 10.17.149.158	10.17.149.159
174	10.17.149.160/27	10.17.149.161 – 10.17.149.190	10.17.149.191
175	10.17.149.192/27	10.17.149.193 – 10.17.149.222	10.17.149.223
176	10.17.149.224/27	10.17.149.225 – 10.17.149.254	10.17.149.255
177	10.17.150.0/27	10.17.150.1 – 10.17.150.30	10.17.150.31
178	10.17.150.32/27	10.17.150.33 – 10.17.150.62	10.17.150.63
179	10.17.150.64/27	10.17.150.65 – 10.17.150.94	10.17.150.95
180	10.17.150.96/27	10.17.150.97 – 10.17.150.126	10.17.150.127
181	10.17.150.128/27	10.17.150.129 – 10.17.150.158	10.17.150.159
182	10.17.150.160/27	10.17.150.161 – 10.17.150.190	10.17.150.191
183	10.17.150.192/27	10.17.150.193 – 10.17.150.222	10.17.150.223
184	10.17.150.224/27	10.17.150.225 – 10.17.150.254	10.17.150.255
185	10.17.151.0/27	10.17.151.1 – 10.17.151.30	10.17.151.31
186	10.17.151.32/27	10.17.151.33 – 10.17.151.62	10.17.151.63
187	10.17.151.64/27	10.17.151.65 – 10.17.151.94	10.17.151.95
188	10.17.151.96/27	10.17.151.97 – 10.17.151.126	10.17.151.127
189	10.17.151.128/27	10.17.151.129 – 10.17.151.158	10.17.151.159
190	10.17.151.160/27	10.17.151.161 – 10.17.151.190	10.17.151.191
191	10.17.151.192/27	10.17.151.193 – 10.17.151.222	10.17.151.223
192	10.17.151.224/27	10.17.151.225 – 10.17.151.254	10.17.151.255
193	10.17.152.0/27	10.17.152.1 – 10.17.152.30	10.17.152.31
194	10.17.152.32/27	10.17.152.33 – 10.17.152.62	10.17.152.63
195	10.17.152.64/27	10.17.152.65 – 10.17.152.94	10.17.152.95
196	10.17.152.96/27	10.17.152.97 – 10.17.152.126	10.17.152.127
197	10.17.152.128/27	10.17.152.129 – 10.17.152.158	10.17.152.159
198	10.17.152.160/27	10.17.152.161 – 10.17.152.190	10.17.152.191
199	10.17.152.192/27	10.17.152.193 – 10.17.152.222	10.17.152.223
200	10.17.152.224/27	10.17.152.225 – 10.17.152.254	10.17.152.255
201	10.17.153.0/27	10.17.153.1 – 10.17.153.30	10.17.153.31
202	10.17.153.32/27	10.17.153.33 – 10.17.153.62	10.17.153.63
203	10.17.153.64/27	10.17.153.65 – 10.17.153.94	10.17.153.95
204	10.17.153.96/27	10.17.153.97 – 10.17.153.126	10.17.153.127
205	10.17.153.128/27	10.17.153.129 – 10.17.153.158	10.17.153.159
206	10.17.153.160/27	10.17.153.161 – 10.17.153.190	10.17.153.191
207	10.17.153.192/27	10.17.153.193 – 10.17.153.222	10.17.153.223
208	10.17.153.224/27	10.17.153.225 – 10.17.153.254	10.17.153.255
209	10.17.154.0/27	10.17.154.1 – 10.17.154.30	10.17.154.31
210	10.17.154.32/27	10.17.154.33 – 10.17.154.62	10.17.154.63
211	10.17.154.64/27	10.17.154.65 – 10.17.154.94	10.17.154.95
212	10.17.154.96/27	10.17.154.97 – 10.17.154.126	10.17.154.127
213	10.17.154.128/27	10.17.154.129 – 10.17.154.158	10.17.154.159
214	10.17.154.160/27	10.17.154.161 – 10.17.154.190	10.17.154.191
215	10.17.154.192/27	10.17.154.193 – 10.17.154.222	10.17.154.223
216	10.17.154.224/27	10.17.154.225 – 10.17.154.254	10.17.154.255
217	10.17.155.0/27	10.17.155.1 – 10.17.155.30	10.17.155.31
218	10.17.155.32/27	10.17.155.33 – 10.17.155.62	10.17.155.63
219	10.17.155.64/27	10.17.155.65 – 10.17.155.94	10.17.155.95
220	10.17.155.96/27	10.17.155.97 – 10.17.155.126	10.17.155.127
221	10.17.155.128/27	10.17.155.129 – 10.17.155.158	10.17.155.159
222	10.17.155.160/27	10.17.155.161 – 10.17.155.190	10.17.155.191
223	10.17.155.192/27	10.17.155.193 – 10.17.155.222	10.17.155.223
224	10.17.155.224/27	10.17.155.225 – 10.17.155.254	10.17.155.255
225	10.17.156.0/27	10.17.156.1 – 10.17.156.30	10.17.156.31
226	10.17.156.32/27	10.17.156.33 – 10.17.156.62	10.17.156.63
227	10.17.156.64/27	10.17.156.65 – 10.17.156.94	10.17.156.95
228	10.17.156.96/27	10.17.156.97 – 10.17.156.126	10.17.156.127
229	10.17.156.128/27	10.17.156.129 – 10.17.156.158	10.17.156.159
230	10.17.156.160/27	10.17.156.161 – 10.17.156.190	10.17.156.191
231	10.17.156.192/27	10.17.156.193 – 10.17.156.222	10.17.156.223
232	10.17.156.224/27	10.17.156.225 – 10.17.156.254	10.17.156.255
233	10.17.157.0/27	10.17.157.1 – 10.17.157.30	10.17.157.31
234	10.17.157.32/27	10.17.157.33 – 10.17.157.62	10.17.157.63
235	10.17.157.64/27	10.17.157.65 – 10.17.157.94	10.17.157.95
236	10.17.157.96/27	10.17.157.97 – 10.17.157.126	10.17.157.127
237	10.17.157.128/27	10.17.157.129 – 10.17.157.158	10.17.157.159
238	10.17.157.160/27	10.17.157.161 – 10.17.157.190	10.17.157.191
239	10.17.157.192/27	10.17.157.193 – 10.17.157.222	10.17.157.223
240	10.17.157.224/27	10.17.157.225 – 10.17.157.254	10.17.157.255
241	10.17.158.0/27	10.17.158.1 – 10.17.158.30	10.17.158.31
242	10.17.158.32/27	10.17.158.33 – 10.17.158.62	10.17.158.63
243	10.17.158.64/27	10.17.158.65 – 10.17.158.94	10.17.158.95
244	10.17.158.96/27	10.17.158.97 – 10.17.158.126	10.17.158.127
245	10.17.158.128/27	10.17.158.129 – 10.17.158.158	10.17.158.159
246	10.17.158.160/27	10.17.158.161 – 10.17.158.190	10.17.158.191
247	10.17.158.192/27	10.17.158.193 – 10.17.158.222	10.17.158.223
248	10.17.158.224/27	10.17.158.225 – 10.17.158.254	10.17.158.255
249	10.17.159.0/27	10.17.159.1 – 10.17.159.30	10.17.159.31
250	10.17.159.32/27	10.17.159.33 – 10.17.159.62	10.17.159.63
251	10.17.159.64/27	10.17.159.65 – 10.17.159.94	10.17.159.95
252	10.17.159.96/27	10.17.159.97 – 10.17.159.126	10.17.159.127
253	10.17.159.128/27	10.17.159.129 – 10.17.159.158	10.17.159.159
254	10.17.159.160/27	10.17.159.161 – 10.17.159.190	10.17.159.191
255	10.17.159.192/27	10.17.159.193 – 10.17.159.222	10.17.159.223
256	10.17.159.224/27	10.17.159.225 – 10.17.159.254	10.17.159.255

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