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)10.28.192.0/18

network10.28.192.0/18

broadcast10.28.255.255

first host10.28.192.1

last host10.28.255.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.28.192.0/18

address00001010.00011100.11000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00011100.11000000.00000000

broadcast00001010.00011100.11111111.11111111

green = network part, grey = host part

hex0x0a1cc000

decimal169656320

reverse dns0.192.28.10.in-addr.arpa

ipv4-mapped::ffff:a1c:c000

/18 split into /26 · 256 subnets

close ×

#	network	host range	broadcast
1	10.28.192.0/26	10.28.192.1 – 10.28.192.62	10.28.192.63
2	10.28.192.64/26	10.28.192.65 – 10.28.192.126	10.28.192.127
3	10.28.192.128/26	10.28.192.129 – 10.28.192.190	10.28.192.191
4	10.28.192.192/26	10.28.192.193 – 10.28.192.254	10.28.192.255
5	10.28.193.0/26	10.28.193.1 – 10.28.193.62	10.28.193.63
6	10.28.193.64/26	10.28.193.65 – 10.28.193.126	10.28.193.127
7	10.28.193.128/26	10.28.193.129 – 10.28.193.190	10.28.193.191
8	10.28.193.192/26	10.28.193.193 – 10.28.193.254	10.28.193.255
9	10.28.194.0/26	10.28.194.1 – 10.28.194.62	10.28.194.63
10	10.28.194.64/26	10.28.194.65 – 10.28.194.126	10.28.194.127
11	10.28.194.128/26	10.28.194.129 – 10.28.194.190	10.28.194.191
12	10.28.194.192/26	10.28.194.193 – 10.28.194.254	10.28.194.255
13	10.28.195.0/26	10.28.195.1 – 10.28.195.62	10.28.195.63
14	10.28.195.64/26	10.28.195.65 – 10.28.195.126	10.28.195.127
15	10.28.195.128/26	10.28.195.129 – 10.28.195.190	10.28.195.191
16	10.28.195.192/26	10.28.195.193 – 10.28.195.254	10.28.195.255
17	10.28.196.0/26	10.28.196.1 – 10.28.196.62	10.28.196.63
18	10.28.196.64/26	10.28.196.65 – 10.28.196.126	10.28.196.127
19	10.28.196.128/26	10.28.196.129 – 10.28.196.190	10.28.196.191
20	10.28.196.192/26	10.28.196.193 – 10.28.196.254	10.28.196.255
21	10.28.197.0/26	10.28.197.1 – 10.28.197.62	10.28.197.63
22	10.28.197.64/26	10.28.197.65 – 10.28.197.126	10.28.197.127
23	10.28.197.128/26	10.28.197.129 – 10.28.197.190	10.28.197.191
24	10.28.197.192/26	10.28.197.193 – 10.28.197.254	10.28.197.255
25	10.28.198.0/26	10.28.198.1 – 10.28.198.62	10.28.198.63
26	10.28.198.64/26	10.28.198.65 – 10.28.198.126	10.28.198.127
27	10.28.198.128/26	10.28.198.129 – 10.28.198.190	10.28.198.191
28	10.28.198.192/26	10.28.198.193 – 10.28.198.254	10.28.198.255
29	10.28.199.0/26	10.28.199.1 – 10.28.199.62	10.28.199.63
30	10.28.199.64/26	10.28.199.65 – 10.28.199.126	10.28.199.127
31	10.28.199.128/26	10.28.199.129 – 10.28.199.190	10.28.199.191
32	10.28.199.192/26	10.28.199.193 – 10.28.199.254	10.28.199.255
33	10.28.200.0/26	10.28.200.1 – 10.28.200.62	10.28.200.63
34	10.28.200.64/26	10.28.200.65 – 10.28.200.126	10.28.200.127
35	10.28.200.128/26	10.28.200.129 – 10.28.200.190	10.28.200.191
36	10.28.200.192/26	10.28.200.193 – 10.28.200.254	10.28.200.255
37	10.28.201.0/26	10.28.201.1 – 10.28.201.62	10.28.201.63
38	10.28.201.64/26	10.28.201.65 – 10.28.201.126	10.28.201.127
39	10.28.201.128/26	10.28.201.129 – 10.28.201.190	10.28.201.191
40	10.28.201.192/26	10.28.201.193 – 10.28.201.254	10.28.201.255
41	10.28.202.0/26	10.28.202.1 – 10.28.202.62	10.28.202.63
42	10.28.202.64/26	10.28.202.65 – 10.28.202.126	10.28.202.127
43	10.28.202.128/26	10.28.202.129 – 10.28.202.190	10.28.202.191
44	10.28.202.192/26	10.28.202.193 – 10.28.202.254	10.28.202.255
45	10.28.203.0/26	10.28.203.1 – 10.28.203.62	10.28.203.63
46	10.28.203.64/26	10.28.203.65 – 10.28.203.126	10.28.203.127
47	10.28.203.128/26	10.28.203.129 – 10.28.203.190	10.28.203.191
48	10.28.203.192/26	10.28.203.193 – 10.28.203.254	10.28.203.255
49	10.28.204.0/26	10.28.204.1 – 10.28.204.62	10.28.204.63
50	10.28.204.64/26	10.28.204.65 – 10.28.204.126	10.28.204.127
51	10.28.204.128/26	10.28.204.129 – 10.28.204.190	10.28.204.191
52	10.28.204.192/26	10.28.204.193 – 10.28.204.254	10.28.204.255
53	10.28.205.0/26	10.28.205.1 – 10.28.205.62	10.28.205.63
54	10.28.205.64/26	10.28.205.65 – 10.28.205.126	10.28.205.127
55	10.28.205.128/26	10.28.205.129 – 10.28.205.190	10.28.205.191
56	10.28.205.192/26	10.28.205.193 – 10.28.205.254	10.28.205.255
57	10.28.206.0/26	10.28.206.1 – 10.28.206.62	10.28.206.63
58	10.28.206.64/26	10.28.206.65 – 10.28.206.126	10.28.206.127
59	10.28.206.128/26	10.28.206.129 – 10.28.206.190	10.28.206.191
60	10.28.206.192/26	10.28.206.193 – 10.28.206.254	10.28.206.255
61	10.28.207.0/26	10.28.207.1 – 10.28.207.62	10.28.207.63
62	10.28.207.64/26	10.28.207.65 – 10.28.207.126	10.28.207.127
63	10.28.207.128/26	10.28.207.129 – 10.28.207.190	10.28.207.191
64	10.28.207.192/26	10.28.207.193 – 10.28.207.254	10.28.207.255
65	10.28.208.0/26	10.28.208.1 – 10.28.208.62	10.28.208.63
66	10.28.208.64/26	10.28.208.65 – 10.28.208.126	10.28.208.127
67	10.28.208.128/26	10.28.208.129 – 10.28.208.190	10.28.208.191
68	10.28.208.192/26	10.28.208.193 – 10.28.208.254	10.28.208.255
69	10.28.209.0/26	10.28.209.1 – 10.28.209.62	10.28.209.63
70	10.28.209.64/26	10.28.209.65 – 10.28.209.126	10.28.209.127
71	10.28.209.128/26	10.28.209.129 – 10.28.209.190	10.28.209.191
72	10.28.209.192/26	10.28.209.193 – 10.28.209.254	10.28.209.255
73	10.28.210.0/26	10.28.210.1 – 10.28.210.62	10.28.210.63
74	10.28.210.64/26	10.28.210.65 – 10.28.210.126	10.28.210.127
75	10.28.210.128/26	10.28.210.129 – 10.28.210.190	10.28.210.191
76	10.28.210.192/26	10.28.210.193 – 10.28.210.254	10.28.210.255
77	10.28.211.0/26	10.28.211.1 – 10.28.211.62	10.28.211.63
78	10.28.211.64/26	10.28.211.65 – 10.28.211.126	10.28.211.127
79	10.28.211.128/26	10.28.211.129 – 10.28.211.190	10.28.211.191
80	10.28.211.192/26	10.28.211.193 – 10.28.211.254	10.28.211.255
81	10.28.212.0/26	10.28.212.1 – 10.28.212.62	10.28.212.63
82	10.28.212.64/26	10.28.212.65 – 10.28.212.126	10.28.212.127
83	10.28.212.128/26	10.28.212.129 – 10.28.212.190	10.28.212.191
84	10.28.212.192/26	10.28.212.193 – 10.28.212.254	10.28.212.255
85	10.28.213.0/26	10.28.213.1 – 10.28.213.62	10.28.213.63
86	10.28.213.64/26	10.28.213.65 – 10.28.213.126	10.28.213.127
87	10.28.213.128/26	10.28.213.129 – 10.28.213.190	10.28.213.191
88	10.28.213.192/26	10.28.213.193 – 10.28.213.254	10.28.213.255
89	10.28.214.0/26	10.28.214.1 – 10.28.214.62	10.28.214.63
90	10.28.214.64/26	10.28.214.65 – 10.28.214.126	10.28.214.127
91	10.28.214.128/26	10.28.214.129 – 10.28.214.190	10.28.214.191
92	10.28.214.192/26	10.28.214.193 – 10.28.214.254	10.28.214.255
93	10.28.215.0/26	10.28.215.1 – 10.28.215.62	10.28.215.63
94	10.28.215.64/26	10.28.215.65 – 10.28.215.126	10.28.215.127
95	10.28.215.128/26	10.28.215.129 – 10.28.215.190	10.28.215.191
96	10.28.215.192/26	10.28.215.193 – 10.28.215.254	10.28.215.255
97	10.28.216.0/26	10.28.216.1 – 10.28.216.62	10.28.216.63
98	10.28.216.64/26	10.28.216.65 – 10.28.216.126	10.28.216.127
99	10.28.216.128/26	10.28.216.129 – 10.28.216.190	10.28.216.191
100	10.28.216.192/26	10.28.216.193 – 10.28.216.254	10.28.216.255
101	10.28.217.0/26	10.28.217.1 – 10.28.217.62	10.28.217.63
102	10.28.217.64/26	10.28.217.65 – 10.28.217.126	10.28.217.127
103	10.28.217.128/26	10.28.217.129 – 10.28.217.190	10.28.217.191
104	10.28.217.192/26	10.28.217.193 – 10.28.217.254	10.28.217.255
105	10.28.218.0/26	10.28.218.1 – 10.28.218.62	10.28.218.63
106	10.28.218.64/26	10.28.218.65 – 10.28.218.126	10.28.218.127
107	10.28.218.128/26	10.28.218.129 – 10.28.218.190	10.28.218.191
108	10.28.218.192/26	10.28.218.193 – 10.28.218.254	10.28.218.255
109	10.28.219.0/26	10.28.219.1 – 10.28.219.62	10.28.219.63
110	10.28.219.64/26	10.28.219.65 – 10.28.219.126	10.28.219.127
111	10.28.219.128/26	10.28.219.129 – 10.28.219.190	10.28.219.191
112	10.28.219.192/26	10.28.219.193 – 10.28.219.254	10.28.219.255
113	10.28.220.0/26	10.28.220.1 – 10.28.220.62	10.28.220.63
114	10.28.220.64/26	10.28.220.65 – 10.28.220.126	10.28.220.127
115	10.28.220.128/26	10.28.220.129 – 10.28.220.190	10.28.220.191
116	10.28.220.192/26	10.28.220.193 – 10.28.220.254	10.28.220.255
117	10.28.221.0/26	10.28.221.1 – 10.28.221.62	10.28.221.63
118	10.28.221.64/26	10.28.221.65 – 10.28.221.126	10.28.221.127
119	10.28.221.128/26	10.28.221.129 – 10.28.221.190	10.28.221.191
120	10.28.221.192/26	10.28.221.193 – 10.28.221.254	10.28.221.255
121	10.28.222.0/26	10.28.222.1 – 10.28.222.62	10.28.222.63
122	10.28.222.64/26	10.28.222.65 – 10.28.222.126	10.28.222.127
123	10.28.222.128/26	10.28.222.129 – 10.28.222.190	10.28.222.191
124	10.28.222.192/26	10.28.222.193 – 10.28.222.254	10.28.222.255
125	10.28.223.0/26	10.28.223.1 – 10.28.223.62	10.28.223.63
126	10.28.223.64/26	10.28.223.65 – 10.28.223.126	10.28.223.127
127	10.28.223.128/26	10.28.223.129 – 10.28.223.190	10.28.223.191
128	10.28.223.192/26	10.28.223.193 – 10.28.223.254	10.28.223.255
129	10.28.224.0/26	10.28.224.1 – 10.28.224.62	10.28.224.63
130	10.28.224.64/26	10.28.224.65 – 10.28.224.126	10.28.224.127
131	10.28.224.128/26	10.28.224.129 – 10.28.224.190	10.28.224.191
132	10.28.224.192/26	10.28.224.193 – 10.28.224.254	10.28.224.255
133	10.28.225.0/26	10.28.225.1 – 10.28.225.62	10.28.225.63
134	10.28.225.64/26	10.28.225.65 – 10.28.225.126	10.28.225.127
135	10.28.225.128/26	10.28.225.129 – 10.28.225.190	10.28.225.191
136	10.28.225.192/26	10.28.225.193 – 10.28.225.254	10.28.225.255
137	10.28.226.0/26	10.28.226.1 – 10.28.226.62	10.28.226.63
138	10.28.226.64/26	10.28.226.65 – 10.28.226.126	10.28.226.127
139	10.28.226.128/26	10.28.226.129 – 10.28.226.190	10.28.226.191
140	10.28.226.192/26	10.28.226.193 – 10.28.226.254	10.28.226.255
141	10.28.227.0/26	10.28.227.1 – 10.28.227.62	10.28.227.63
142	10.28.227.64/26	10.28.227.65 – 10.28.227.126	10.28.227.127
143	10.28.227.128/26	10.28.227.129 – 10.28.227.190	10.28.227.191
144	10.28.227.192/26	10.28.227.193 – 10.28.227.254	10.28.227.255
145	10.28.228.0/26	10.28.228.1 – 10.28.228.62	10.28.228.63
146	10.28.228.64/26	10.28.228.65 – 10.28.228.126	10.28.228.127
147	10.28.228.128/26	10.28.228.129 – 10.28.228.190	10.28.228.191
148	10.28.228.192/26	10.28.228.193 – 10.28.228.254	10.28.228.255
149	10.28.229.0/26	10.28.229.1 – 10.28.229.62	10.28.229.63
150	10.28.229.64/26	10.28.229.65 – 10.28.229.126	10.28.229.127
151	10.28.229.128/26	10.28.229.129 – 10.28.229.190	10.28.229.191
152	10.28.229.192/26	10.28.229.193 – 10.28.229.254	10.28.229.255
153	10.28.230.0/26	10.28.230.1 – 10.28.230.62	10.28.230.63
154	10.28.230.64/26	10.28.230.65 – 10.28.230.126	10.28.230.127
155	10.28.230.128/26	10.28.230.129 – 10.28.230.190	10.28.230.191
156	10.28.230.192/26	10.28.230.193 – 10.28.230.254	10.28.230.255
157	10.28.231.0/26	10.28.231.1 – 10.28.231.62	10.28.231.63
158	10.28.231.64/26	10.28.231.65 – 10.28.231.126	10.28.231.127
159	10.28.231.128/26	10.28.231.129 – 10.28.231.190	10.28.231.191
160	10.28.231.192/26	10.28.231.193 – 10.28.231.254	10.28.231.255
161	10.28.232.0/26	10.28.232.1 – 10.28.232.62	10.28.232.63
162	10.28.232.64/26	10.28.232.65 – 10.28.232.126	10.28.232.127
163	10.28.232.128/26	10.28.232.129 – 10.28.232.190	10.28.232.191
164	10.28.232.192/26	10.28.232.193 – 10.28.232.254	10.28.232.255
165	10.28.233.0/26	10.28.233.1 – 10.28.233.62	10.28.233.63
166	10.28.233.64/26	10.28.233.65 – 10.28.233.126	10.28.233.127
167	10.28.233.128/26	10.28.233.129 – 10.28.233.190	10.28.233.191
168	10.28.233.192/26	10.28.233.193 – 10.28.233.254	10.28.233.255
169	10.28.234.0/26	10.28.234.1 – 10.28.234.62	10.28.234.63
170	10.28.234.64/26	10.28.234.65 – 10.28.234.126	10.28.234.127
171	10.28.234.128/26	10.28.234.129 – 10.28.234.190	10.28.234.191
172	10.28.234.192/26	10.28.234.193 – 10.28.234.254	10.28.234.255
173	10.28.235.0/26	10.28.235.1 – 10.28.235.62	10.28.235.63
174	10.28.235.64/26	10.28.235.65 – 10.28.235.126	10.28.235.127
175	10.28.235.128/26	10.28.235.129 – 10.28.235.190	10.28.235.191
176	10.28.235.192/26	10.28.235.193 – 10.28.235.254	10.28.235.255
177	10.28.236.0/26	10.28.236.1 – 10.28.236.62	10.28.236.63
178	10.28.236.64/26	10.28.236.65 – 10.28.236.126	10.28.236.127
179	10.28.236.128/26	10.28.236.129 – 10.28.236.190	10.28.236.191
180	10.28.236.192/26	10.28.236.193 – 10.28.236.254	10.28.236.255
181	10.28.237.0/26	10.28.237.1 – 10.28.237.62	10.28.237.63
182	10.28.237.64/26	10.28.237.65 – 10.28.237.126	10.28.237.127
183	10.28.237.128/26	10.28.237.129 – 10.28.237.190	10.28.237.191
184	10.28.237.192/26	10.28.237.193 – 10.28.237.254	10.28.237.255
185	10.28.238.0/26	10.28.238.1 – 10.28.238.62	10.28.238.63
186	10.28.238.64/26	10.28.238.65 – 10.28.238.126	10.28.238.127
187	10.28.238.128/26	10.28.238.129 – 10.28.238.190	10.28.238.191
188	10.28.238.192/26	10.28.238.193 – 10.28.238.254	10.28.238.255
189	10.28.239.0/26	10.28.239.1 – 10.28.239.62	10.28.239.63
190	10.28.239.64/26	10.28.239.65 – 10.28.239.126	10.28.239.127
191	10.28.239.128/26	10.28.239.129 – 10.28.239.190	10.28.239.191
192	10.28.239.192/26	10.28.239.193 – 10.28.239.254	10.28.239.255
193	10.28.240.0/26	10.28.240.1 – 10.28.240.62	10.28.240.63
194	10.28.240.64/26	10.28.240.65 – 10.28.240.126	10.28.240.127
195	10.28.240.128/26	10.28.240.129 – 10.28.240.190	10.28.240.191
196	10.28.240.192/26	10.28.240.193 – 10.28.240.254	10.28.240.255
197	10.28.241.0/26	10.28.241.1 – 10.28.241.62	10.28.241.63
198	10.28.241.64/26	10.28.241.65 – 10.28.241.126	10.28.241.127
199	10.28.241.128/26	10.28.241.129 – 10.28.241.190	10.28.241.191
200	10.28.241.192/26	10.28.241.193 – 10.28.241.254	10.28.241.255
201	10.28.242.0/26	10.28.242.1 – 10.28.242.62	10.28.242.63
202	10.28.242.64/26	10.28.242.65 – 10.28.242.126	10.28.242.127
203	10.28.242.128/26	10.28.242.129 – 10.28.242.190	10.28.242.191
204	10.28.242.192/26	10.28.242.193 – 10.28.242.254	10.28.242.255
205	10.28.243.0/26	10.28.243.1 – 10.28.243.62	10.28.243.63
206	10.28.243.64/26	10.28.243.65 – 10.28.243.126	10.28.243.127
207	10.28.243.128/26	10.28.243.129 – 10.28.243.190	10.28.243.191
208	10.28.243.192/26	10.28.243.193 – 10.28.243.254	10.28.243.255
209	10.28.244.0/26	10.28.244.1 – 10.28.244.62	10.28.244.63
210	10.28.244.64/26	10.28.244.65 – 10.28.244.126	10.28.244.127
211	10.28.244.128/26	10.28.244.129 – 10.28.244.190	10.28.244.191
212	10.28.244.192/26	10.28.244.193 – 10.28.244.254	10.28.244.255
213	10.28.245.0/26	10.28.245.1 – 10.28.245.62	10.28.245.63
214	10.28.245.64/26	10.28.245.65 – 10.28.245.126	10.28.245.127
215	10.28.245.128/26	10.28.245.129 – 10.28.245.190	10.28.245.191
216	10.28.245.192/26	10.28.245.193 – 10.28.245.254	10.28.245.255
217	10.28.246.0/26	10.28.246.1 – 10.28.246.62	10.28.246.63
218	10.28.246.64/26	10.28.246.65 – 10.28.246.126	10.28.246.127
219	10.28.246.128/26	10.28.246.129 – 10.28.246.190	10.28.246.191
220	10.28.246.192/26	10.28.246.193 – 10.28.246.254	10.28.246.255
221	10.28.247.0/26	10.28.247.1 – 10.28.247.62	10.28.247.63
222	10.28.247.64/26	10.28.247.65 – 10.28.247.126	10.28.247.127
223	10.28.247.128/26	10.28.247.129 – 10.28.247.190	10.28.247.191
224	10.28.247.192/26	10.28.247.193 – 10.28.247.254	10.28.247.255
225	10.28.248.0/26	10.28.248.1 – 10.28.248.62	10.28.248.63
226	10.28.248.64/26	10.28.248.65 – 10.28.248.126	10.28.248.127
227	10.28.248.128/26	10.28.248.129 – 10.28.248.190	10.28.248.191
228	10.28.248.192/26	10.28.248.193 – 10.28.248.254	10.28.248.255
229	10.28.249.0/26	10.28.249.1 – 10.28.249.62	10.28.249.63
230	10.28.249.64/26	10.28.249.65 – 10.28.249.126	10.28.249.127
231	10.28.249.128/26	10.28.249.129 – 10.28.249.190	10.28.249.191
232	10.28.249.192/26	10.28.249.193 – 10.28.249.254	10.28.249.255
233	10.28.250.0/26	10.28.250.1 – 10.28.250.62	10.28.250.63
234	10.28.250.64/26	10.28.250.65 – 10.28.250.126	10.28.250.127
235	10.28.250.128/26	10.28.250.129 – 10.28.250.190	10.28.250.191
236	10.28.250.192/26	10.28.250.193 – 10.28.250.254	10.28.250.255
237	10.28.251.0/26	10.28.251.1 – 10.28.251.62	10.28.251.63
238	10.28.251.64/26	10.28.251.65 – 10.28.251.126	10.28.251.127
239	10.28.251.128/26	10.28.251.129 – 10.28.251.190	10.28.251.191
240	10.28.251.192/26	10.28.251.193 – 10.28.251.254	10.28.251.255
241	10.28.252.0/26	10.28.252.1 – 10.28.252.62	10.28.252.63
242	10.28.252.64/26	10.28.252.65 – 10.28.252.126	10.28.252.127
243	10.28.252.128/26	10.28.252.129 – 10.28.252.190	10.28.252.191
244	10.28.252.192/26	10.28.252.193 – 10.28.252.254	10.28.252.255
245	10.28.253.0/26	10.28.253.1 – 10.28.253.62	10.28.253.63
246	10.28.253.64/26	10.28.253.65 – 10.28.253.126	10.28.253.127
247	10.28.253.128/26	10.28.253.129 – 10.28.253.190	10.28.253.191
248	10.28.253.192/26	10.28.253.193 – 10.28.253.254	10.28.253.255
249	10.28.254.0/26	10.28.254.1 – 10.28.254.62	10.28.254.63
250	10.28.254.64/26	10.28.254.65 – 10.28.254.126	10.28.254.127
251	10.28.254.128/26	10.28.254.129 – 10.28.254.190	10.28.254.191
252	10.28.254.192/26	10.28.254.193 – 10.28.254.254	10.28.254.255
253	10.28.255.0/26	10.28.255.1 – 10.28.255.62	10.28.255.63
254	10.28.255.64/26	10.28.255.65 – 10.28.255.126	10.28.255.127
255	10.28.255.128/26	10.28.255.129 – 10.28.255.190	10.28.255.191
256	10.28.255.192/26	10.28.255.193 – 10.28.255.254	10.28.255.255

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 /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 →