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 /25 · 256 subnets

close ×

#	network	host range	broadcast
1	10.31.128.0/25	10.31.128.1 – 10.31.128.126	10.31.128.127
2	10.31.128.128/25	10.31.128.129 – 10.31.128.254	10.31.128.255
3	10.31.129.0/25	10.31.129.1 – 10.31.129.126	10.31.129.127
4	10.31.129.128/25	10.31.129.129 – 10.31.129.254	10.31.129.255
5	10.31.130.0/25	10.31.130.1 – 10.31.130.126	10.31.130.127
6	10.31.130.128/25	10.31.130.129 – 10.31.130.254	10.31.130.255
7	10.31.131.0/25	10.31.131.1 – 10.31.131.126	10.31.131.127
8	10.31.131.128/25	10.31.131.129 – 10.31.131.254	10.31.131.255
9	10.31.132.0/25	10.31.132.1 – 10.31.132.126	10.31.132.127
10	10.31.132.128/25	10.31.132.129 – 10.31.132.254	10.31.132.255
11	10.31.133.0/25	10.31.133.1 – 10.31.133.126	10.31.133.127
12	10.31.133.128/25	10.31.133.129 – 10.31.133.254	10.31.133.255
13	10.31.134.0/25	10.31.134.1 – 10.31.134.126	10.31.134.127
14	10.31.134.128/25	10.31.134.129 – 10.31.134.254	10.31.134.255
15	10.31.135.0/25	10.31.135.1 – 10.31.135.126	10.31.135.127
16	10.31.135.128/25	10.31.135.129 – 10.31.135.254	10.31.135.255
17	10.31.136.0/25	10.31.136.1 – 10.31.136.126	10.31.136.127
18	10.31.136.128/25	10.31.136.129 – 10.31.136.254	10.31.136.255
19	10.31.137.0/25	10.31.137.1 – 10.31.137.126	10.31.137.127
20	10.31.137.128/25	10.31.137.129 – 10.31.137.254	10.31.137.255
21	10.31.138.0/25	10.31.138.1 – 10.31.138.126	10.31.138.127
22	10.31.138.128/25	10.31.138.129 – 10.31.138.254	10.31.138.255
23	10.31.139.0/25	10.31.139.1 – 10.31.139.126	10.31.139.127
24	10.31.139.128/25	10.31.139.129 – 10.31.139.254	10.31.139.255
25	10.31.140.0/25	10.31.140.1 – 10.31.140.126	10.31.140.127
26	10.31.140.128/25	10.31.140.129 – 10.31.140.254	10.31.140.255
27	10.31.141.0/25	10.31.141.1 – 10.31.141.126	10.31.141.127
28	10.31.141.128/25	10.31.141.129 – 10.31.141.254	10.31.141.255
29	10.31.142.0/25	10.31.142.1 – 10.31.142.126	10.31.142.127
30	10.31.142.128/25	10.31.142.129 – 10.31.142.254	10.31.142.255
31	10.31.143.0/25	10.31.143.1 – 10.31.143.126	10.31.143.127
32	10.31.143.128/25	10.31.143.129 – 10.31.143.254	10.31.143.255
33	10.31.144.0/25	10.31.144.1 – 10.31.144.126	10.31.144.127
34	10.31.144.128/25	10.31.144.129 – 10.31.144.254	10.31.144.255
35	10.31.145.0/25	10.31.145.1 – 10.31.145.126	10.31.145.127
36	10.31.145.128/25	10.31.145.129 – 10.31.145.254	10.31.145.255
37	10.31.146.0/25	10.31.146.1 – 10.31.146.126	10.31.146.127
38	10.31.146.128/25	10.31.146.129 – 10.31.146.254	10.31.146.255
39	10.31.147.0/25	10.31.147.1 – 10.31.147.126	10.31.147.127
40	10.31.147.128/25	10.31.147.129 – 10.31.147.254	10.31.147.255
41	10.31.148.0/25	10.31.148.1 – 10.31.148.126	10.31.148.127
42	10.31.148.128/25	10.31.148.129 – 10.31.148.254	10.31.148.255
43	10.31.149.0/25	10.31.149.1 – 10.31.149.126	10.31.149.127
44	10.31.149.128/25	10.31.149.129 – 10.31.149.254	10.31.149.255
45	10.31.150.0/25	10.31.150.1 – 10.31.150.126	10.31.150.127
46	10.31.150.128/25	10.31.150.129 – 10.31.150.254	10.31.150.255
47	10.31.151.0/25	10.31.151.1 – 10.31.151.126	10.31.151.127
48	10.31.151.128/25	10.31.151.129 – 10.31.151.254	10.31.151.255
49	10.31.152.0/25	10.31.152.1 – 10.31.152.126	10.31.152.127
50	10.31.152.128/25	10.31.152.129 – 10.31.152.254	10.31.152.255
51	10.31.153.0/25	10.31.153.1 – 10.31.153.126	10.31.153.127
52	10.31.153.128/25	10.31.153.129 – 10.31.153.254	10.31.153.255
53	10.31.154.0/25	10.31.154.1 – 10.31.154.126	10.31.154.127
54	10.31.154.128/25	10.31.154.129 – 10.31.154.254	10.31.154.255
55	10.31.155.0/25	10.31.155.1 – 10.31.155.126	10.31.155.127
56	10.31.155.128/25	10.31.155.129 – 10.31.155.254	10.31.155.255
57	10.31.156.0/25	10.31.156.1 – 10.31.156.126	10.31.156.127
58	10.31.156.128/25	10.31.156.129 – 10.31.156.254	10.31.156.255
59	10.31.157.0/25	10.31.157.1 – 10.31.157.126	10.31.157.127
60	10.31.157.128/25	10.31.157.129 – 10.31.157.254	10.31.157.255
61	10.31.158.0/25	10.31.158.1 – 10.31.158.126	10.31.158.127
62	10.31.158.128/25	10.31.158.129 – 10.31.158.254	10.31.158.255
63	10.31.159.0/25	10.31.159.1 – 10.31.159.126	10.31.159.127
64	10.31.159.128/25	10.31.159.129 – 10.31.159.254	10.31.159.255
65	10.31.160.0/25	10.31.160.1 – 10.31.160.126	10.31.160.127
66	10.31.160.128/25	10.31.160.129 – 10.31.160.254	10.31.160.255
67	10.31.161.0/25	10.31.161.1 – 10.31.161.126	10.31.161.127
68	10.31.161.128/25	10.31.161.129 – 10.31.161.254	10.31.161.255
69	10.31.162.0/25	10.31.162.1 – 10.31.162.126	10.31.162.127
70	10.31.162.128/25	10.31.162.129 – 10.31.162.254	10.31.162.255
71	10.31.163.0/25	10.31.163.1 – 10.31.163.126	10.31.163.127
72	10.31.163.128/25	10.31.163.129 – 10.31.163.254	10.31.163.255
73	10.31.164.0/25	10.31.164.1 – 10.31.164.126	10.31.164.127
74	10.31.164.128/25	10.31.164.129 – 10.31.164.254	10.31.164.255
75	10.31.165.0/25	10.31.165.1 – 10.31.165.126	10.31.165.127
76	10.31.165.128/25	10.31.165.129 – 10.31.165.254	10.31.165.255
77	10.31.166.0/25	10.31.166.1 – 10.31.166.126	10.31.166.127
78	10.31.166.128/25	10.31.166.129 – 10.31.166.254	10.31.166.255
79	10.31.167.0/25	10.31.167.1 – 10.31.167.126	10.31.167.127
80	10.31.167.128/25	10.31.167.129 – 10.31.167.254	10.31.167.255
81	10.31.168.0/25	10.31.168.1 – 10.31.168.126	10.31.168.127
82	10.31.168.128/25	10.31.168.129 – 10.31.168.254	10.31.168.255
83	10.31.169.0/25	10.31.169.1 – 10.31.169.126	10.31.169.127
84	10.31.169.128/25	10.31.169.129 – 10.31.169.254	10.31.169.255
85	10.31.170.0/25	10.31.170.1 – 10.31.170.126	10.31.170.127
86	10.31.170.128/25	10.31.170.129 – 10.31.170.254	10.31.170.255
87	10.31.171.0/25	10.31.171.1 – 10.31.171.126	10.31.171.127
88	10.31.171.128/25	10.31.171.129 – 10.31.171.254	10.31.171.255
89	10.31.172.0/25	10.31.172.1 – 10.31.172.126	10.31.172.127
90	10.31.172.128/25	10.31.172.129 – 10.31.172.254	10.31.172.255
91	10.31.173.0/25	10.31.173.1 – 10.31.173.126	10.31.173.127
92	10.31.173.128/25	10.31.173.129 – 10.31.173.254	10.31.173.255
93	10.31.174.0/25	10.31.174.1 – 10.31.174.126	10.31.174.127
94	10.31.174.128/25	10.31.174.129 – 10.31.174.254	10.31.174.255
95	10.31.175.0/25	10.31.175.1 – 10.31.175.126	10.31.175.127
96	10.31.175.128/25	10.31.175.129 – 10.31.175.254	10.31.175.255
97	10.31.176.0/25	10.31.176.1 – 10.31.176.126	10.31.176.127
98	10.31.176.128/25	10.31.176.129 – 10.31.176.254	10.31.176.255
99	10.31.177.0/25	10.31.177.1 – 10.31.177.126	10.31.177.127
100	10.31.177.128/25	10.31.177.129 – 10.31.177.254	10.31.177.255
101	10.31.178.0/25	10.31.178.1 – 10.31.178.126	10.31.178.127
102	10.31.178.128/25	10.31.178.129 – 10.31.178.254	10.31.178.255
103	10.31.179.0/25	10.31.179.1 – 10.31.179.126	10.31.179.127
104	10.31.179.128/25	10.31.179.129 – 10.31.179.254	10.31.179.255
105	10.31.180.0/25	10.31.180.1 – 10.31.180.126	10.31.180.127
106	10.31.180.128/25	10.31.180.129 – 10.31.180.254	10.31.180.255
107	10.31.181.0/25	10.31.181.1 – 10.31.181.126	10.31.181.127
108	10.31.181.128/25	10.31.181.129 – 10.31.181.254	10.31.181.255
109	10.31.182.0/25	10.31.182.1 – 10.31.182.126	10.31.182.127
110	10.31.182.128/25	10.31.182.129 – 10.31.182.254	10.31.182.255
111	10.31.183.0/25	10.31.183.1 – 10.31.183.126	10.31.183.127
112	10.31.183.128/25	10.31.183.129 – 10.31.183.254	10.31.183.255
113	10.31.184.0/25	10.31.184.1 – 10.31.184.126	10.31.184.127
114	10.31.184.128/25	10.31.184.129 – 10.31.184.254	10.31.184.255
115	10.31.185.0/25	10.31.185.1 – 10.31.185.126	10.31.185.127
116	10.31.185.128/25	10.31.185.129 – 10.31.185.254	10.31.185.255
117	10.31.186.0/25	10.31.186.1 – 10.31.186.126	10.31.186.127
118	10.31.186.128/25	10.31.186.129 – 10.31.186.254	10.31.186.255
119	10.31.187.0/25	10.31.187.1 – 10.31.187.126	10.31.187.127
120	10.31.187.128/25	10.31.187.129 – 10.31.187.254	10.31.187.255
121	10.31.188.0/25	10.31.188.1 – 10.31.188.126	10.31.188.127
122	10.31.188.128/25	10.31.188.129 – 10.31.188.254	10.31.188.255
123	10.31.189.0/25	10.31.189.1 – 10.31.189.126	10.31.189.127
124	10.31.189.128/25	10.31.189.129 – 10.31.189.254	10.31.189.255
125	10.31.190.0/25	10.31.190.1 – 10.31.190.126	10.31.190.127
126	10.31.190.128/25	10.31.190.129 – 10.31.190.254	10.31.190.255
127	10.31.191.0/25	10.31.191.1 – 10.31.191.126	10.31.191.127
128	10.31.191.128/25	10.31.191.129 – 10.31.191.254	10.31.191.255
129	10.31.192.0/25	10.31.192.1 – 10.31.192.126	10.31.192.127
130	10.31.192.128/25	10.31.192.129 – 10.31.192.254	10.31.192.255
131	10.31.193.0/25	10.31.193.1 – 10.31.193.126	10.31.193.127
132	10.31.193.128/25	10.31.193.129 – 10.31.193.254	10.31.193.255
133	10.31.194.0/25	10.31.194.1 – 10.31.194.126	10.31.194.127
134	10.31.194.128/25	10.31.194.129 – 10.31.194.254	10.31.194.255
135	10.31.195.0/25	10.31.195.1 – 10.31.195.126	10.31.195.127
136	10.31.195.128/25	10.31.195.129 – 10.31.195.254	10.31.195.255
137	10.31.196.0/25	10.31.196.1 – 10.31.196.126	10.31.196.127
138	10.31.196.128/25	10.31.196.129 – 10.31.196.254	10.31.196.255
139	10.31.197.0/25	10.31.197.1 – 10.31.197.126	10.31.197.127
140	10.31.197.128/25	10.31.197.129 – 10.31.197.254	10.31.197.255
141	10.31.198.0/25	10.31.198.1 – 10.31.198.126	10.31.198.127
142	10.31.198.128/25	10.31.198.129 – 10.31.198.254	10.31.198.255
143	10.31.199.0/25	10.31.199.1 – 10.31.199.126	10.31.199.127
144	10.31.199.128/25	10.31.199.129 – 10.31.199.254	10.31.199.255
145	10.31.200.0/25	10.31.200.1 – 10.31.200.126	10.31.200.127
146	10.31.200.128/25	10.31.200.129 – 10.31.200.254	10.31.200.255
147	10.31.201.0/25	10.31.201.1 – 10.31.201.126	10.31.201.127
148	10.31.201.128/25	10.31.201.129 – 10.31.201.254	10.31.201.255
149	10.31.202.0/25	10.31.202.1 – 10.31.202.126	10.31.202.127
150	10.31.202.128/25	10.31.202.129 – 10.31.202.254	10.31.202.255
151	10.31.203.0/25	10.31.203.1 – 10.31.203.126	10.31.203.127
152	10.31.203.128/25	10.31.203.129 – 10.31.203.254	10.31.203.255
153	10.31.204.0/25	10.31.204.1 – 10.31.204.126	10.31.204.127
154	10.31.204.128/25	10.31.204.129 – 10.31.204.254	10.31.204.255
155	10.31.205.0/25	10.31.205.1 – 10.31.205.126	10.31.205.127
156	10.31.205.128/25	10.31.205.129 – 10.31.205.254	10.31.205.255
157	10.31.206.0/25	10.31.206.1 – 10.31.206.126	10.31.206.127
158	10.31.206.128/25	10.31.206.129 – 10.31.206.254	10.31.206.255
159	10.31.207.0/25	10.31.207.1 – 10.31.207.126	10.31.207.127
160	10.31.207.128/25	10.31.207.129 – 10.31.207.254	10.31.207.255
161	10.31.208.0/25	10.31.208.1 – 10.31.208.126	10.31.208.127
162	10.31.208.128/25	10.31.208.129 – 10.31.208.254	10.31.208.255
163	10.31.209.0/25	10.31.209.1 – 10.31.209.126	10.31.209.127
164	10.31.209.128/25	10.31.209.129 – 10.31.209.254	10.31.209.255
165	10.31.210.0/25	10.31.210.1 – 10.31.210.126	10.31.210.127
166	10.31.210.128/25	10.31.210.129 – 10.31.210.254	10.31.210.255
167	10.31.211.0/25	10.31.211.1 – 10.31.211.126	10.31.211.127
168	10.31.211.128/25	10.31.211.129 – 10.31.211.254	10.31.211.255
169	10.31.212.0/25	10.31.212.1 – 10.31.212.126	10.31.212.127
170	10.31.212.128/25	10.31.212.129 – 10.31.212.254	10.31.212.255
171	10.31.213.0/25	10.31.213.1 – 10.31.213.126	10.31.213.127
172	10.31.213.128/25	10.31.213.129 – 10.31.213.254	10.31.213.255
173	10.31.214.0/25	10.31.214.1 – 10.31.214.126	10.31.214.127
174	10.31.214.128/25	10.31.214.129 – 10.31.214.254	10.31.214.255
175	10.31.215.0/25	10.31.215.1 – 10.31.215.126	10.31.215.127
176	10.31.215.128/25	10.31.215.129 – 10.31.215.254	10.31.215.255
177	10.31.216.0/25	10.31.216.1 – 10.31.216.126	10.31.216.127
178	10.31.216.128/25	10.31.216.129 – 10.31.216.254	10.31.216.255
179	10.31.217.0/25	10.31.217.1 – 10.31.217.126	10.31.217.127
180	10.31.217.128/25	10.31.217.129 – 10.31.217.254	10.31.217.255
181	10.31.218.0/25	10.31.218.1 – 10.31.218.126	10.31.218.127
182	10.31.218.128/25	10.31.218.129 – 10.31.218.254	10.31.218.255
183	10.31.219.0/25	10.31.219.1 – 10.31.219.126	10.31.219.127
184	10.31.219.128/25	10.31.219.129 – 10.31.219.254	10.31.219.255
185	10.31.220.0/25	10.31.220.1 – 10.31.220.126	10.31.220.127
186	10.31.220.128/25	10.31.220.129 – 10.31.220.254	10.31.220.255
187	10.31.221.0/25	10.31.221.1 – 10.31.221.126	10.31.221.127
188	10.31.221.128/25	10.31.221.129 – 10.31.221.254	10.31.221.255
189	10.31.222.0/25	10.31.222.1 – 10.31.222.126	10.31.222.127
190	10.31.222.128/25	10.31.222.129 – 10.31.222.254	10.31.222.255
191	10.31.223.0/25	10.31.223.1 – 10.31.223.126	10.31.223.127
192	10.31.223.128/25	10.31.223.129 – 10.31.223.254	10.31.223.255
193	10.31.224.0/25	10.31.224.1 – 10.31.224.126	10.31.224.127
194	10.31.224.128/25	10.31.224.129 – 10.31.224.254	10.31.224.255
195	10.31.225.0/25	10.31.225.1 – 10.31.225.126	10.31.225.127
196	10.31.225.128/25	10.31.225.129 – 10.31.225.254	10.31.225.255
197	10.31.226.0/25	10.31.226.1 – 10.31.226.126	10.31.226.127
198	10.31.226.128/25	10.31.226.129 – 10.31.226.254	10.31.226.255
199	10.31.227.0/25	10.31.227.1 – 10.31.227.126	10.31.227.127
200	10.31.227.128/25	10.31.227.129 – 10.31.227.254	10.31.227.255
201	10.31.228.0/25	10.31.228.1 – 10.31.228.126	10.31.228.127
202	10.31.228.128/25	10.31.228.129 – 10.31.228.254	10.31.228.255
203	10.31.229.0/25	10.31.229.1 – 10.31.229.126	10.31.229.127
204	10.31.229.128/25	10.31.229.129 – 10.31.229.254	10.31.229.255
205	10.31.230.0/25	10.31.230.1 – 10.31.230.126	10.31.230.127
206	10.31.230.128/25	10.31.230.129 – 10.31.230.254	10.31.230.255
207	10.31.231.0/25	10.31.231.1 – 10.31.231.126	10.31.231.127
208	10.31.231.128/25	10.31.231.129 – 10.31.231.254	10.31.231.255
209	10.31.232.0/25	10.31.232.1 – 10.31.232.126	10.31.232.127
210	10.31.232.128/25	10.31.232.129 – 10.31.232.254	10.31.232.255
211	10.31.233.0/25	10.31.233.1 – 10.31.233.126	10.31.233.127
212	10.31.233.128/25	10.31.233.129 – 10.31.233.254	10.31.233.255
213	10.31.234.0/25	10.31.234.1 – 10.31.234.126	10.31.234.127
214	10.31.234.128/25	10.31.234.129 – 10.31.234.254	10.31.234.255
215	10.31.235.0/25	10.31.235.1 – 10.31.235.126	10.31.235.127
216	10.31.235.128/25	10.31.235.129 – 10.31.235.254	10.31.235.255
217	10.31.236.0/25	10.31.236.1 – 10.31.236.126	10.31.236.127
218	10.31.236.128/25	10.31.236.129 – 10.31.236.254	10.31.236.255
219	10.31.237.0/25	10.31.237.1 – 10.31.237.126	10.31.237.127
220	10.31.237.128/25	10.31.237.129 – 10.31.237.254	10.31.237.255
221	10.31.238.0/25	10.31.238.1 – 10.31.238.126	10.31.238.127
222	10.31.238.128/25	10.31.238.129 – 10.31.238.254	10.31.238.255
223	10.31.239.0/25	10.31.239.1 – 10.31.239.126	10.31.239.127
224	10.31.239.128/25	10.31.239.129 – 10.31.239.254	10.31.239.255
225	10.31.240.0/25	10.31.240.1 – 10.31.240.126	10.31.240.127
226	10.31.240.128/25	10.31.240.129 – 10.31.240.254	10.31.240.255
227	10.31.241.0/25	10.31.241.1 – 10.31.241.126	10.31.241.127
228	10.31.241.128/25	10.31.241.129 – 10.31.241.254	10.31.241.255
229	10.31.242.0/25	10.31.242.1 – 10.31.242.126	10.31.242.127
230	10.31.242.128/25	10.31.242.129 – 10.31.242.254	10.31.242.255
231	10.31.243.0/25	10.31.243.1 – 10.31.243.126	10.31.243.127
232	10.31.243.128/25	10.31.243.129 – 10.31.243.254	10.31.243.255
233	10.31.244.0/25	10.31.244.1 – 10.31.244.126	10.31.244.127
234	10.31.244.128/25	10.31.244.129 – 10.31.244.254	10.31.244.255
235	10.31.245.0/25	10.31.245.1 – 10.31.245.126	10.31.245.127
236	10.31.245.128/25	10.31.245.129 – 10.31.245.254	10.31.245.255
237	10.31.246.0/25	10.31.246.1 – 10.31.246.126	10.31.246.127
238	10.31.246.128/25	10.31.246.129 – 10.31.246.254	10.31.246.255
239	10.31.247.0/25	10.31.247.1 – 10.31.247.126	10.31.247.127
240	10.31.247.128/25	10.31.247.129 – 10.31.247.254	10.31.247.255
241	10.31.248.0/25	10.31.248.1 – 10.31.248.126	10.31.248.127
242	10.31.248.128/25	10.31.248.129 – 10.31.248.254	10.31.248.255
243	10.31.249.0/25	10.31.249.1 – 10.31.249.126	10.31.249.127
244	10.31.249.128/25	10.31.249.129 – 10.31.249.254	10.31.249.255
245	10.31.250.0/25	10.31.250.1 – 10.31.250.126	10.31.250.127
246	10.31.250.128/25	10.31.250.129 – 10.31.250.254	10.31.250.255
247	10.31.251.0/25	10.31.251.1 – 10.31.251.126	10.31.251.127
248	10.31.251.128/25	10.31.251.129 – 10.31.251.254	10.31.251.255
249	10.31.252.0/25	10.31.252.1 – 10.31.252.126	10.31.252.127
250	10.31.252.128/25	10.31.252.129 – 10.31.252.254	10.31.252.255
251	10.31.253.0/25	10.31.253.1 – 10.31.253.126	10.31.253.127
252	10.31.253.128/25	10.31.253.129 – 10.31.253.254	10.31.253.255
253	10.31.254.0/25	10.31.254.1 – 10.31.254.126	10.31.254.127
254	10.31.254.128/25	10.31.254.129 – 10.31.254.254	10.31.254.255
255	10.31.255.0/25	10.31.255.1 – 10.31.255.126	10.31.255.127
256	10.31.255.128/25	10.31.255.129 – 10.31.255.254	10.31.255.255

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 /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 →