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)10.31.128.0/17

network10.31.128.0/17

broadcast10.31.255.255

first host10.31.128.1

last host10.31.255.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.31.128.0/17

address00001010.00011111.10000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.00011111.10000000.00000000

broadcast00001010.00011111.11111111.11111111

green = network part, grey = host part

hex0x0a1f8000

decimal169836544

reverse dns0.128.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:8000

/17 split into /27 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.31.128.0/27	10.31.128.1 – 10.31.128.30	10.31.128.31
2	10.31.128.32/27	10.31.128.33 – 10.31.128.62	10.31.128.63
3	10.31.128.64/27	10.31.128.65 – 10.31.128.94	10.31.128.95
4	10.31.128.96/27	10.31.128.97 – 10.31.128.126	10.31.128.127
5	10.31.128.128/27	10.31.128.129 – 10.31.128.158	10.31.128.159
6	10.31.128.160/27	10.31.128.161 – 10.31.128.190	10.31.128.191
7	10.31.128.192/27	10.31.128.193 – 10.31.128.222	10.31.128.223
8	10.31.128.224/27	10.31.128.225 – 10.31.128.254	10.31.128.255
9	10.31.129.0/27	10.31.129.1 – 10.31.129.30	10.31.129.31
10	10.31.129.32/27	10.31.129.33 – 10.31.129.62	10.31.129.63
11	10.31.129.64/27	10.31.129.65 – 10.31.129.94	10.31.129.95
12	10.31.129.96/27	10.31.129.97 – 10.31.129.126	10.31.129.127
13	10.31.129.128/27	10.31.129.129 – 10.31.129.158	10.31.129.159
14	10.31.129.160/27	10.31.129.161 – 10.31.129.190	10.31.129.191
15	10.31.129.192/27	10.31.129.193 – 10.31.129.222	10.31.129.223
16	10.31.129.224/27	10.31.129.225 – 10.31.129.254	10.31.129.255
17	10.31.130.0/27	10.31.130.1 – 10.31.130.30	10.31.130.31
18	10.31.130.32/27	10.31.130.33 – 10.31.130.62	10.31.130.63
19	10.31.130.64/27	10.31.130.65 – 10.31.130.94	10.31.130.95
20	10.31.130.96/27	10.31.130.97 – 10.31.130.126	10.31.130.127
21	10.31.130.128/27	10.31.130.129 – 10.31.130.158	10.31.130.159
22	10.31.130.160/27	10.31.130.161 – 10.31.130.190	10.31.130.191
23	10.31.130.192/27	10.31.130.193 – 10.31.130.222	10.31.130.223
24	10.31.130.224/27	10.31.130.225 – 10.31.130.254	10.31.130.255
25	10.31.131.0/27	10.31.131.1 – 10.31.131.30	10.31.131.31
26	10.31.131.32/27	10.31.131.33 – 10.31.131.62	10.31.131.63
27	10.31.131.64/27	10.31.131.65 – 10.31.131.94	10.31.131.95
28	10.31.131.96/27	10.31.131.97 – 10.31.131.126	10.31.131.127
29	10.31.131.128/27	10.31.131.129 – 10.31.131.158	10.31.131.159
30	10.31.131.160/27	10.31.131.161 – 10.31.131.190	10.31.131.191
31	10.31.131.192/27	10.31.131.193 – 10.31.131.222	10.31.131.223
32	10.31.131.224/27	10.31.131.225 – 10.31.131.254	10.31.131.255
33	10.31.132.0/27	10.31.132.1 – 10.31.132.30	10.31.132.31
34	10.31.132.32/27	10.31.132.33 – 10.31.132.62	10.31.132.63
35	10.31.132.64/27	10.31.132.65 – 10.31.132.94	10.31.132.95
36	10.31.132.96/27	10.31.132.97 – 10.31.132.126	10.31.132.127
37	10.31.132.128/27	10.31.132.129 – 10.31.132.158	10.31.132.159
38	10.31.132.160/27	10.31.132.161 – 10.31.132.190	10.31.132.191
39	10.31.132.192/27	10.31.132.193 – 10.31.132.222	10.31.132.223
40	10.31.132.224/27	10.31.132.225 – 10.31.132.254	10.31.132.255
41	10.31.133.0/27	10.31.133.1 – 10.31.133.30	10.31.133.31
42	10.31.133.32/27	10.31.133.33 – 10.31.133.62	10.31.133.63
43	10.31.133.64/27	10.31.133.65 – 10.31.133.94	10.31.133.95
44	10.31.133.96/27	10.31.133.97 – 10.31.133.126	10.31.133.127
45	10.31.133.128/27	10.31.133.129 – 10.31.133.158	10.31.133.159
46	10.31.133.160/27	10.31.133.161 – 10.31.133.190	10.31.133.191
47	10.31.133.192/27	10.31.133.193 – 10.31.133.222	10.31.133.223
48	10.31.133.224/27	10.31.133.225 – 10.31.133.254	10.31.133.255
49	10.31.134.0/27	10.31.134.1 – 10.31.134.30	10.31.134.31
50	10.31.134.32/27	10.31.134.33 – 10.31.134.62	10.31.134.63
51	10.31.134.64/27	10.31.134.65 – 10.31.134.94	10.31.134.95
52	10.31.134.96/27	10.31.134.97 – 10.31.134.126	10.31.134.127
53	10.31.134.128/27	10.31.134.129 – 10.31.134.158	10.31.134.159
54	10.31.134.160/27	10.31.134.161 – 10.31.134.190	10.31.134.191
55	10.31.134.192/27	10.31.134.193 – 10.31.134.222	10.31.134.223
56	10.31.134.224/27	10.31.134.225 – 10.31.134.254	10.31.134.255
57	10.31.135.0/27	10.31.135.1 – 10.31.135.30	10.31.135.31
58	10.31.135.32/27	10.31.135.33 – 10.31.135.62	10.31.135.63
59	10.31.135.64/27	10.31.135.65 – 10.31.135.94	10.31.135.95
60	10.31.135.96/27	10.31.135.97 – 10.31.135.126	10.31.135.127
61	10.31.135.128/27	10.31.135.129 – 10.31.135.158	10.31.135.159
62	10.31.135.160/27	10.31.135.161 – 10.31.135.190	10.31.135.191
63	10.31.135.192/27	10.31.135.193 – 10.31.135.222	10.31.135.223
64	10.31.135.224/27	10.31.135.225 – 10.31.135.254	10.31.135.255
65	10.31.136.0/27	10.31.136.1 – 10.31.136.30	10.31.136.31
66	10.31.136.32/27	10.31.136.33 – 10.31.136.62	10.31.136.63
67	10.31.136.64/27	10.31.136.65 – 10.31.136.94	10.31.136.95
68	10.31.136.96/27	10.31.136.97 – 10.31.136.126	10.31.136.127
69	10.31.136.128/27	10.31.136.129 – 10.31.136.158	10.31.136.159
70	10.31.136.160/27	10.31.136.161 – 10.31.136.190	10.31.136.191
71	10.31.136.192/27	10.31.136.193 – 10.31.136.222	10.31.136.223
72	10.31.136.224/27	10.31.136.225 – 10.31.136.254	10.31.136.255
73	10.31.137.0/27	10.31.137.1 – 10.31.137.30	10.31.137.31
74	10.31.137.32/27	10.31.137.33 – 10.31.137.62	10.31.137.63
75	10.31.137.64/27	10.31.137.65 – 10.31.137.94	10.31.137.95
76	10.31.137.96/27	10.31.137.97 – 10.31.137.126	10.31.137.127
77	10.31.137.128/27	10.31.137.129 – 10.31.137.158	10.31.137.159
78	10.31.137.160/27	10.31.137.161 – 10.31.137.190	10.31.137.191
79	10.31.137.192/27	10.31.137.193 – 10.31.137.222	10.31.137.223
80	10.31.137.224/27	10.31.137.225 – 10.31.137.254	10.31.137.255
81	10.31.138.0/27	10.31.138.1 – 10.31.138.30	10.31.138.31
82	10.31.138.32/27	10.31.138.33 – 10.31.138.62	10.31.138.63
83	10.31.138.64/27	10.31.138.65 – 10.31.138.94	10.31.138.95
84	10.31.138.96/27	10.31.138.97 – 10.31.138.126	10.31.138.127
85	10.31.138.128/27	10.31.138.129 – 10.31.138.158	10.31.138.159
86	10.31.138.160/27	10.31.138.161 – 10.31.138.190	10.31.138.191
87	10.31.138.192/27	10.31.138.193 – 10.31.138.222	10.31.138.223
88	10.31.138.224/27	10.31.138.225 – 10.31.138.254	10.31.138.255
89	10.31.139.0/27	10.31.139.1 – 10.31.139.30	10.31.139.31
90	10.31.139.32/27	10.31.139.33 – 10.31.139.62	10.31.139.63
91	10.31.139.64/27	10.31.139.65 – 10.31.139.94	10.31.139.95
92	10.31.139.96/27	10.31.139.97 – 10.31.139.126	10.31.139.127
93	10.31.139.128/27	10.31.139.129 – 10.31.139.158	10.31.139.159
94	10.31.139.160/27	10.31.139.161 – 10.31.139.190	10.31.139.191
95	10.31.139.192/27	10.31.139.193 – 10.31.139.222	10.31.139.223
96	10.31.139.224/27	10.31.139.225 – 10.31.139.254	10.31.139.255
97	10.31.140.0/27	10.31.140.1 – 10.31.140.30	10.31.140.31
98	10.31.140.32/27	10.31.140.33 – 10.31.140.62	10.31.140.63
99	10.31.140.64/27	10.31.140.65 – 10.31.140.94	10.31.140.95
100	10.31.140.96/27	10.31.140.97 – 10.31.140.126	10.31.140.127
101	10.31.140.128/27	10.31.140.129 – 10.31.140.158	10.31.140.159
102	10.31.140.160/27	10.31.140.161 – 10.31.140.190	10.31.140.191
103	10.31.140.192/27	10.31.140.193 – 10.31.140.222	10.31.140.223
104	10.31.140.224/27	10.31.140.225 – 10.31.140.254	10.31.140.255
105	10.31.141.0/27	10.31.141.1 – 10.31.141.30	10.31.141.31
106	10.31.141.32/27	10.31.141.33 – 10.31.141.62	10.31.141.63
107	10.31.141.64/27	10.31.141.65 – 10.31.141.94	10.31.141.95
108	10.31.141.96/27	10.31.141.97 – 10.31.141.126	10.31.141.127
109	10.31.141.128/27	10.31.141.129 – 10.31.141.158	10.31.141.159
110	10.31.141.160/27	10.31.141.161 – 10.31.141.190	10.31.141.191
111	10.31.141.192/27	10.31.141.193 – 10.31.141.222	10.31.141.223
112	10.31.141.224/27	10.31.141.225 – 10.31.141.254	10.31.141.255
113	10.31.142.0/27	10.31.142.1 – 10.31.142.30	10.31.142.31
114	10.31.142.32/27	10.31.142.33 – 10.31.142.62	10.31.142.63
115	10.31.142.64/27	10.31.142.65 – 10.31.142.94	10.31.142.95
116	10.31.142.96/27	10.31.142.97 – 10.31.142.126	10.31.142.127
117	10.31.142.128/27	10.31.142.129 – 10.31.142.158	10.31.142.159
118	10.31.142.160/27	10.31.142.161 – 10.31.142.190	10.31.142.191
119	10.31.142.192/27	10.31.142.193 – 10.31.142.222	10.31.142.223
120	10.31.142.224/27	10.31.142.225 – 10.31.142.254	10.31.142.255
121	10.31.143.0/27	10.31.143.1 – 10.31.143.30	10.31.143.31
122	10.31.143.32/27	10.31.143.33 – 10.31.143.62	10.31.143.63
123	10.31.143.64/27	10.31.143.65 – 10.31.143.94	10.31.143.95
124	10.31.143.96/27	10.31.143.97 – 10.31.143.126	10.31.143.127
125	10.31.143.128/27	10.31.143.129 – 10.31.143.158	10.31.143.159
126	10.31.143.160/27	10.31.143.161 – 10.31.143.190	10.31.143.191
127	10.31.143.192/27	10.31.143.193 – 10.31.143.222	10.31.143.223
128	10.31.143.224/27	10.31.143.225 – 10.31.143.254	10.31.143.255
129	10.31.144.0/27	10.31.144.1 – 10.31.144.30	10.31.144.31
130	10.31.144.32/27	10.31.144.33 – 10.31.144.62	10.31.144.63
131	10.31.144.64/27	10.31.144.65 – 10.31.144.94	10.31.144.95
132	10.31.144.96/27	10.31.144.97 – 10.31.144.126	10.31.144.127
133	10.31.144.128/27	10.31.144.129 – 10.31.144.158	10.31.144.159
134	10.31.144.160/27	10.31.144.161 – 10.31.144.190	10.31.144.191
135	10.31.144.192/27	10.31.144.193 – 10.31.144.222	10.31.144.223
136	10.31.144.224/27	10.31.144.225 – 10.31.144.254	10.31.144.255
137	10.31.145.0/27	10.31.145.1 – 10.31.145.30	10.31.145.31
138	10.31.145.32/27	10.31.145.33 – 10.31.145.62	10.31.145.63
139	10.31.145.64/27	10.31.145.65 – 10.31.145.94	10.31.145.95
140	10.31.145.96/27	10.31.145.97 – 10.31.145.126	10.31.145.127
141	10.31.145.128/27	10.31.145.129 – 10.31.145.158	10.31.145.159
142	10.31.145.160/27	10.31.145.161 – 10.31.145.190	10.31.145.191
143	10.31.145.192/27	10.31.145.193 – 10.31.145.222	10.31.145.223
144	10.31.145.224/27	10.31.145.225 – 10.31.145.254	10.31.145.255
145	10.31.146.0/27	10.31.146.1 – 10.31.146.30	10.31.146.31
146	10.31.146.32/27	10.31.146.33 – 10.31.146.62	10.31.146.63
147	10.31.146.64/27	10.31.146.65 – 10.31.146.94	10.31.146.95
148	10.31.146.96/27	10.31.146.97 – 10.31.146.126	10.31.146.127
149	10.31.146.128/27	10.31.146.129 – 10.31.146.158	10.31.146.159
150	10.31.146.160/27	10.31.146.161 – 10.31.146.190	10.31.146.191
151	10.31.146.192/27	10.31.146.193 – 10.31.146.222	10.31.146.223
152	10.31.146.224/27	10.31.146.225 – 10.31.146.254	10.31.146.255
153	10.31.147.0/27	10.31.147.1 – 10.31.147.30	10.31.147.31
154	10.31.147.32/27	10.31.147.33 – 10.31.147.62	10.31.147.63
155	10.31.147.64/27	10.31.147.65 – 10.31.147.94	10.31.147.95
156	10.31.147.96/27	10.31.147.97 – 10.31.147.126	10.31.147.127
157	10.31.147.128/27	10.31.147.129 – 10.31.147.158	10.31.147.159
158	10.31.147.160/27	10.31.147.161 – 10.31.147.190	10.31.147.191
159	10.31.147.192/27	10.31.147.193 – 10.31.147.222	10.31.147.223
160	10.31.147.224/27	10.31.147.225 – 10.31.147.254	10.31.147.255
161	10.31.148.0/27	10.31.148.1 – 10.31.148.30	10.31.148.31
162	10.31.148.32/27	10.31.148.33 – 10.31.148.62	10.31.148.63
163	10.31.148.64/27	10.31.148.65 – 10.31.148.94	10.31.148.95
164	10.31.148.96/27	10.31.148.97 – 10.31.148.126	10.31.148.127
165	10.31.148.128/27	10.31.148.129 – 10.31.148.158	10.31.148.159
166	10.31.148.160/27	10.31.148.161 – 10.31.148.190	10.31.148.191
167	10.31.148.192/27	10.31.148.193 – 10.31.148.222	10.31.148.223
168	10.31.148.224/27	10.31.148.225 – 10.31.148.254	10.31.148.255
169	10.31.149.0/27	10.31.149.1 – 10.31.149.30	10.31.149.31
170	10.31.149.32/27	10.31.149.33 – 10.31.149.62	10.31.149.63
171	10.31.149.64/27	10.31.149.65 – 10.31.149.94	10.31.149.95
172	10.31.149.96/27	10.31.149.97 – 10.31.149.126	10.31.149.127
173	10.31.149.128/27	10.31.149.129 – 10.31.149.158	10.31.149.159
174	10.31.149.160/27	10.31.149.161 – 10.31.149.190	10.31.149.191
175	10.31.149.192/27	10.31.149.193 – 10.31.149.222	10.31.149.223
176	10.31.149.224/27	10.31.149.225 – 10.31.149.254	10.31.149.255
177	10.31.150.0/27	10.31.150.1 – 10.31.150.30	10.31.150.31
178	10.31.150.32/27	10.31.150.33 – 10.31.150.62	10.31.150.63
179	10.31.150.64/27	10.31.150.65 – 10.31.150.94	10.31.150.95
180	10.31.150.96/27	10.31.150.97 – 10.31.150.126	10.31.150.127
181	10.31.150.128/27	10.31.150.129 – 10.31.150.158	10.31.150.159
182	10.31.150.160/27	10.31.150.161 – 10.31.150.190	10.31.150.191
183	10.31.150.192/27	10.31.150.193 – 10.31.150.222	10.31.150.223
184	10.31.150.224/27	10.31.150.225 – 10.31.150.254	10.31.150.255
185	10.31.151.0/27	10.31.151.1 – 10.31.151.30	10.31.151.31
186	10.31.151.32/27	10.31.151.33 – 10.31.151.62	10.31.151.63
187	10.31.151.64/27	10.31.151.65 – 10.31.151.94	10.31.151.95
188	10.31.151.96/27	10.31.151.97 – 10.31.151.126	10.31.151.127
189	10.31.151.128/27	10.31.151.129 – 10.31.151.158	10.31.151.159
190	10.31.151.160/27	10.31.151.161 – 10.31.151.190	10.31.151.191
191	10.31.151.192/27	10.31.151.193 – 10.31.151.222	10.31.151.223
192	10.31.151.224/27	10.31.151.225 – 10.31.151.254	10.31.151.255
193	10.31.152.0/27	10.31.152.1 – 10.31.152.30	10.31.152.31
194	10.31.152.32/27	10.31.152.33 – 10.31.152.62	10.31.152.63
195	10.31.152.64/27	10.31.152.65 – 10.31.152.94	10.31.152.95
196	10.31.152.96/27	10.31.152.97 – 10.31.152.126	10.31.152.127
197	10.31.152.128/27	10.31.152.129 – 10.31.152.158	10.31.152.159
198	10.31.152.160/27	10.31.152.161 – 10.31.152.190	10.31.152.191
199	10.31.152.192/27	10.31.152.193 – 10.31.152.222	10.31.152.223
200	10.31.152.224/27	10.31.152.225 – 10.31.152.254	10.31.152.255
201	10.31.153.0/27	10.31.153.1 – 10.31.153.30	10.31.153.31
202	10.31.153.32/27	10.31.153.33 – 10.31.153.62	10.31.153.63
203	10.31.153.64/27	10.31.153.65 – 10.31.153.94	10.31.153.95
204	10.31.153.96/27	10.31.153.97 – 10.31.153.126	10.31.153.127
205	10.31.153.128/27	10.31.153.129 – 10.31.153.158	10.31.153.159
206	10.31.153.160/27	10.31.153.161 – 10.31.153.190	10.31.153.191
207	10.31.153.192/27	10.31.153.193 – 10.31.153.222	10.31.153.223
208	10.31.153.224/27	10.31.153.225 – 10.31.153.254	10.31.153.255
209	10.31.154.0/27	10.31.154.1 – 10.31.154.30	10.31.154.31
210	10.31.154.32/27	10.31.154.33 – 10.31.154.62	10.31.154.63
211	10.31.154.64/27	10.31.154.65 – 10.31.154.94	10.31.154.95
212	10.31.154.96/27	10.31.154.97 – 10.31.154.126	10.31.154.127
213	10.31.154.128/27	10.31.154.129 – 10.31.154.158	10.31.154.159
214	10.31.154.160/27	10.31.154.161 – 10.31.154.190	10.31.154.191
215	10.31.154.192/27	10.31.154.193 – 10.31.154.222	10.31.154.223
216	10.31.154.224/27	10.31.154.225 – 10.31.154.254	10.31.154.255
217	10.31.155.0/27	10.31.155.1 – 10.31.155.30	10.31.155.31
218	10.31.155.32/27	10.31.155.33 – 10.31.155.62	10.31.155.63
219	10.31.155.64/27	10.31.155.65 – 10.31.155.94	10.31.155.95
220	10.31.155.96/27	10.31.155.97 – 10.31.155.126	10.31.155.127
221	10.31.155.128/27	10.31.155.129 – 10.31.155.158	10.31.155.159
222	10.31.155.160/27	10.31.155.161 – 10.31.155.190	10.31.155.191
223	10.31.155.192/27	10.31.155.193 – 10.31.155.222	10.31.155.223
224	10.31.155.224/27	10.31.155.225 – 10.31.155.254	10.31.155.255
225	10.31.156.0/27	10.31.156.1 – 10.31.156.30	10.31.156.31
226	10.31.156.32/27	10.31.156.33 – 10.31.156.62	10.31.156.63
227	10.31.156.64/27	10.31.156.65 – 10.31.156.94	10.31.156.95
228	10.31.156.96/27	10.31.156.97 – 10.31.156.126	10.31.156.127
229	10.31.156.128/27	10.31.156.129 – 10.31.156.158	10.31.156.159
230	10.31.156.160/27	10.31.156.161 – 10.31.156.190	10.31.156.191
231	10.31.156.192/27	10.31.156.193 – 10.31.156.222	10.31.156.223
232	10.31.156.224/27	10.31.156.225 – 10.31.156.254	10.31.156.255
233	10.31.157.0/27	10.31.157.1 – 10.31.157.30	10.31.157.31
234	10.31.157.32/27	10.31.157.33 – 10.31.157.62	10.31.157.63
235	10.31.157.64/27	10.31.157.65 – 10.31.157.94	10.31.157.95
236	10.31.157.96/27	10.31.157.97 – 10.31.157.126	10.31.157.127
237	10.31.157.128/27	10.31.157.129 – 10.31.157.158	10.31.157.159
238	10.31.157.160/27	10.31.157.161 – 10.31.157.190	10.31.157.191
239	10.31.157.192/27	10.31.157.193 – 10.31.157.222	10.31.157.223
240	10.31.157.224/27	10.31.157.225 – 10.31.157.254	10.31.157.255
241	10.31.158.0/27	10.31.158.1 – 10.31.158.30	10.31.158.31
242	10.31.158.32/27	10.31.158.33 – 10.31.158.62	10.31.158.63
243	10.31.158.64/27	10.31.158.65 – 10.31.158.94	10.31.158.95
244	10.31.158.96/27	10.31.158.97 – 10.31.158.126	10.31.158.127
245	10.31.158.128/27	10.31.158.129 – 10.31.158.158	10.31.158.159
246	10.31.158.160/27	10.31.158.161 – 10.31.158.190	10.31.158.191
247	10.31.158.192/27	10.31.158.193 – 10.31.158.222	10.31.158.223
248	10.31.158.224/27	10.31.158.225 – 10.31.158.254	10.31.158.255
249	10.31.159.0/27	10.31.159.1 – 10.31.159.30	10.31.159.31
250	10.31.159.32/27	10.31.159.33 – 10.31.159.62	10.31.159.63
251	10.31.159.64/27	10.31.159.65 – 10.31.159.94	10.31.159.95
252	10.31.159.96/27	10.31.159.97 – 10.31.159.126	10.31.159.127
253	10.31.159.128/27	10.31.159.129 – 10.31.159.158	10.31.159.159
254	10.31.159.160/27	10.31.159.161 – 10.31.159.190	10.31.159.191
255	10.31.159.192/27	10.31.159.193 – 10.31.159.222	10.31.159.223
256	10.31.159.224/27	10.31.159.225 – 10.31.159.254	10.31.159.255

showing 256 of 1,024

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 →