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)10.3.192.0/18

network10.3.192.0/18

broadcast10.3.255.255

first host10.3.192.1

last host10.3.255.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.3.192.0/18

address00001010.00000011.11000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00000011.11000000.00000000

broadcast00001010.00000011.11111111.11111111

green = network part, grey = host part

hex0x0a03c000

decimal168017920

reverse dns0.192.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c000

/18 split into /27 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/27	10.3.192.1 – 10.3.192.30	10.3.192.31
2	10.3.192.32/27	10.3.192.33 – 10.3.192.62	10.3.192.63
3	10.3.192.64/27	10.3.192.65 – 10.3.192.94	10.3.192.95
4	10.3.192.96/27	10.3.192.97 – 10.3.192.126	10.3.192.127
5	10.3.192.128/27	10.3.192.129 – 10.3.192.158	10.3.192.159
6	10.3.192.160/27	10.3.192.161 – 10.3.192.190	10.3.192.191
7	10.3.192.192/27	10.3.192.193 – 10.3.192.222	10.3.192.223
8	10.3.192.224/27	10.3.192.225 – 10.3.192.254	10.3.192.255
9	10.3.193.0/27	10.3.193.1 – 10.3.193.30	10.3.193.31
10	10.3.193.32/27	10.3.193.33 – 10.3.193.62	10.3.193.63
11	10.3.193.64/27	10.3.193.65 – 10.3.193.94	10.3.193.95
12	10.3.193.96/27	10.3.193.97 – 10.3.193.126	10.3.193.127
13	10.3.193.128/27	10.3.193.129 – 10.3.193.158	10.3.193.159
14	10.3.193.160/27	10.3.193.161 – 10.3.193.190	10.3.193.191
15	10.3.193.192/27	10.3.193.193 – 10.3.193.222	10.3.193.223
16	10.3.193.224/27	10.3.193.225 – 10.3.193.254	10.3.193.255
17	10.3.194.0/27	10.3.194.1 – 10.3.194.30	10.3.194.31
18	10.3.194.32/27	10.3.194.33 – 10.3.194.62	10.3.194.63
19	10.3.194.64/27	10.3.194.65 – 10.3.194.94	10.3.194.95
20	10.3.194.96/27	10.3.194.97 – 10.3.194.126	10.3.194.127
21	10.3.194.128/27	10.3.194.129 – 10.3.194.158	10.3.194.159
22	10.3.194.160/27	10.3.194.161 – 10.3.194.190	10.3.194.191
23	10.3.194.192/27	10.3.194.193 – 10.3.194.222	10.3.194.223
24	10.3.194.224/27	10.3.194.225 – 10.3.194.254	10.3.194.255
25	10.3.195.0/27	10.3.195.1 – 10.3.195.30	10.3.195.31
26	10.3.195.32/27	10.3.195.33 – 10.3.195.62	10.3.195.63
27	10.3.195.64/27	10.3.195.65 – 10.3.195.94	10.3.195.95
28	10.3.195.96/27	10.3.195.97 – 10.3.195.126	10.3.195.127
29	10.3.195.128/27	10.3.195.129 – 10.3.195.158	10.3.195.159
30	10.3.195.160/27	10.3.195.161 – 10.3.195.190	10.3.195.191
31	10.3.195.192/27	10.3.195.193 – 10.3.195.222	10.3.195.223
32	10.3.195.224/27	10.3.195.225 – 10.3.195.254	10.3.195.255
33	10.3.196.0/27	10.3.196.1 – 10.3.196.30	10.3.196.31
34	10.3.196.32/27	10.3.196.33 – 10.3.196.62	10.3.196.63
35	10.3.196.64/27	10.3.196.65 – 10.3.196.94	10.3.196.95
36	10.3.196.96/27	10.3.196.97 – 10.3.196.126	10.3.196.127
37	10.3.196.128/27	10.3.196.129 – 10.3.196.158	10.3.196.159
38	10.3.196.160/27	10.3.196.161 – 10.3.196.190	10.3.196.191
39	10.3.196.192/27	10.3.196.193 – 10.3.196.222	10.3.196.223
40	10.3.196.224/27	10.3.196.225 – 10.3.196.254	10.3.196.255
41	10.3.197.0/27	10.3.197.1 – 10.3.197.30	10.3.197.31
42	10.3.197.32/27	10.3.197.33 – 10.3.197.62	10.3.197.63
43	10.3.197.64/27	10.3.197.65 – 10.3.197.94	10.3.197.95
44	10.3.197.96/27	10.3.197.97 – 10.3.197.126	10.3.197.127
45	10.3.197.128/27	10.3.197.129 – 10.3.197.158	10.3.197.159
46	10.3.197.160/27	10.3.197.161 – 10.3.197.190	10.3.197.191
47	10.3.197.192/27	10.3.197.193 – 10.3.197.222	10.3.197.223
48	10.3.197.224/27	10.3.197.225 – 10.3.197.254	10.3.197.255
49	10.3.198.0/27	10.3.198.1 – 10.3.198.30	10.3.198.31
50	10.3.198.32/27	10.3.198.33 – 10.3.198.62	10.3.198.63
51	10.3.198.64/27	10.3.198.65 – 10.3.198.94	10.3.198.95
52	10.3.198.96/27	10.3.198.97 – 10.3.198.126	10.3.198.127
53	10.3.198.128/27	10.3.198.129 – 10.3.198.158	10.3.198.159
54	10.3.198.160/27	10.3.198.161 – 10.3.198.190	10.3.198.191
55	10.3.198.192/27	10.3.198.193 – 10.3.198.222	10.3.198.223
56	10.3.198.224/27	10.3.198.225 – 10.3.198.254	10.3.198.255
57	10.3.199.0/27	10.3.199.1 – 10.3.199.30	10.3.199.31
58	10.3.199.32/27	10.3.199.33 – 10.3.199.62	10.3.199.63
59	10.3.199.64/27	10.3.199.65 – 10.3.199.94	10.3.199.95
60	10.3.199.96/27	10.3.199.97 – 10.3.199.126	10.3.199.127
61	10.3.199.128/27	10.3.199.129 – 10.3.199.158	10.3.199.159
62	10.3.199.160/27	10.3.199.161 – 10.3.199.190	10.3.199.191
63	10.3.199.192/27	10.3.199.193 – 10.3.199.222	10.3.199.223
64	10.3.199.224/27	10.3.199.225 – 10.3.199.254	10.3.199.255
65	10.3.200.0/27	10.3.200.1 – 10.3.200.30	10.3.200.31
66	10.3.200.32/27	10.3.200.33 – 10.3.200.62	10.3.200.63
67	10.3.200.64/27	10.3.200.65 – 10.3.200.94	10.3.200.95
68	10.3.200.96/27	10.3.200.97 – 10.3.200.126	10.3.200.127
69	10.3.200.128/27	10.3.200.129 – 10.3.200.158	10.3.200.159
70	10.3.200.160/27	10.3.200.161 – 10.3.200.190	10.3.200.191
71	10.3.200.192/27	10.3.200.193 – 10.3.200.222	10.3.200.223
72	10.3.200.224/27	10.3.200.225 – 10.3.200.254	10.3.200.255
73	10.3.201.0/27	10.3.201.1 – 10.3.201.30	10.3.201.31
74	10.3.201.32/27	10.3.201.33 – 10.3.201.62	10.3.201.63
75	10.3.201.64/27	10.3.201.65 – 10.3.201.94	10.3.201.95
76	10.3.201.96/27	10.3.201.97 – 10.3.201.126	10.3.201.127
77	10.3.201.128/27	10.3.201.129 – 10.3.201.158	10.3.201.159
78	10.3.201.160/27	10.3.201.161 – 10.3.201.190	10.3.201.191
79	10.3.201.192/27	10.3.201.193 – 10.3.201.222	10.3.201.223
80	10.3.201.224/27	10.3.201.225 – 10.3.201.254	10.3.201.255
81	10.3.202.0/27	10.3.202.1 – 10.3.202.30	10.3.202.31
82	10.3.202.32/27	10.3.202.33 – 10.3.202.62	10.3.202.63
83	10.3.202.64/27	10.3.202.65 – 10.3.202.94	10.3.202.95
84	10.3.202.96/27	10.3.202.97 – 10.3.202.126	10.3.202.127
85	10.3.202.128/27	10.3.202.129 – 10.3.202.158	10.3.202.159
86	10.3.202.160/27	10.3.202.161 – 10.3.202.190	10.3.202.191
87	10.3.202.192/27	10.3.202.193 – 10.3.202.222	10.3.202.223
88	10.3.202.224/27	10.3.202.225 – 10.3.202.254	10.3.202.255
89	10.3.203.0/27	10.3.203.1 – 10.3.203.30	10.3.203.31
90	10.3.203.32/27	10.3.203.33 – 10.3.203.62	10.3.203.63
91	10.3.203.64/27	10.3.203.65 – 10.3.203.94	10.3.203.95
92	10.3.203.96/27	10.3.203.97 – 10.3.203.126	10.3.203.127
93	10.3.203.128/27	10.3.203.129 – 10.3.203.158	10.3.203.159
94	10.3.203.160/27	10.3.203.161 – 10.3.203.190	10.3.203.191
95	10.3.203.192/27	10.3.203.193 – 10.3.203.222	10.3.203.223
96	10.3.203.224/27	10.3.203.225 – 10.3.203.254	10.3.203.255
97	10.3.204.0/27	10.3.204.1 – 10.3.204.30	10.3.204.31
98	10.3.204.32/27	10.3.204.33 – 10.3.204.62	10.3.204.63
99	10.3.204.64/27	10.3.204.65 – 10.3.204.94	10.3.204.95
100	10.3.204.96/27	10.3.204.97 – 10.3.204.126	10.3.204.127
101	10.3.204.128/27	10.3.204.129 – 10.3.204.158	10.3.204.159
102	10.3.204.160/27	10.3.204.161 – 10.3.204.190	10.3.204.191
103	10.3.204.192/27	10.3.204.193 – 10.3.204.222	10.3.204.223
104	10.3.204.224/27	10.3.204.225 – 10.3.204.254	10.3.204.255
105	10.3.205.0/27	10.3.205.1 – 10.3.205.30	10.3.205.31
106	10.3.205.32/27	10.3.205.33 – 10.3.205.62	10.3.205.63
107	10.3.205.64/27	10.3.205.65 – 10.3.205.94	10.3.205.95
108	10.3.205.96/27	10.3.205.97 – 10.3.205.126	10.3.205.127
109	10.3.205.128/27	10.3.205.129 – 10.3.205.158	10.3.205.159
110	10.3.205.160/27	10.3.205.161 – 10.3.205.190	10.3.205.191
111	10.3.205.192/27	10.3.205.193 – 10.3.205.222	10.3.205.223
112	10.3.205.224/27	10.3.205.225 – 10.3.205.254	10.3.205.255
113	10.3.206.0/27	10.3.206.1 – 10.3.206.30	10.3.206.31
114	10.3.206.32/27	10.3.206.33 – 10.3.206.62	10.3.206.63
115	10.3.206.64/27	10.3.206.65 – 10.3.206.94	10.3.206.95
116	10.3.206.96/27	10.3.206.97 – 10.3.206.126	10.3.206.127
117	10.3.206.128/27	10.3.206.129 – 10.3.206.158	10.3.206.159
118	10.3.206.160/27	10.3.206.161 – 10.3.206.190	10.3.206.191
119	10.3.206.192/27	10.3.206.193 – 10.3.206.222	10.3.206.223
120	10.3.206.224/27	10.3.206.225 – 10.3.206.254	10.3.206.255
121	10.3.207.0/27	10.3.207.1 – 10.3.207.30	10.3.207.31
122	10.3.207.32/27	10.3.207.33 – 10.3.207.62	10.3.207.63
123	10.3.207.64/27	10.3.207.65 – 10.3.207.94	10.3.207.95
124	10.3.207.96/27	10.3.207.97 – 10.3.207.126	10.3.207.127
125	10.3.207.128/27	10.3.207.129 – 10.3.207.158	10.3.207.159
126	10.3.207.160/27	10.3.207.161 – 10.3.207.190	10.3.207.191
127	10.3.207.192/27	10.3.207.193 – 10.3.207.222	10.3.207.223
128	10.3.207.224/27	10.3.207.225 – 10.3.207.254	10.3.207.255
129	10.3.208.0/27	10.3.208.1 – 10.3.208.30	10.3.208.31
130	10.3.208.32/27	10.3.208.33 – 10.3.208.62	10.3.208.63
131	10.3.208.64/27	10.3.208.65 – 10.3.208.94	10.3.208.95
132	10.3.208.96/27	10.3.208.97 – 10.3.208.126	10.3.208.127
133	10.3.208.128/27	10.3.208.129 – 10.3.208.158	10.3.208.159
134	10.3.208.160/27	10.3.208.161 – 10.3.208.190	10.3.208.191
135	10.3.208.192/27	10.3.208.193 – 10.3.208.222	10.3.208.223
136	10.3.208.224/27	10.3.208.225 – 10.3.208.254	10.3.208.255
137	10.3.209.0/27	10.3.209.1 – 10.3.209.30	10.3.209.31
138	10.3.209.32/27	10.3.209.33 – 10.3.209.62	10.3.209.63
139	10.3.209.64/27	10.3.209.65 – 10.3.209.94	10.3.209.95
140	10.3.209.96/27	10.3.209.97 – 10.3.209.126	10.3.209.127
141	10.3.209.128/27	10.3.209.129 – 10.3.209.158	10.3.209.159
142	10.3.209.160/27	10.3.209.161 – 10.3.209.190	10.3.209.191
143	10.3.209.192/27	10.3.209.193 – 10.3.209.222	10.3.209.223
144	10.3.209.224/27	10.3.209.225 – 10.3.209.254	10.3.209.255
145	10.3.210.0/27	10.3.210.1 – 10.3.210.30	10.3.210.31
146	10.3.210.32/27	10.3.210.33 – 10.3.210.62	10.3.210.63
147	10.3.210.64/27	10.3.210.65 – 10.3.210.94	10.3.210.95
148	10.3.210.96/27	10.3.210.97 – 10.3.210.126	10.3.210.127
149	10.3.210.128/27	10.3.210.129 – 10.3.210.158	10.3.210.159
150	10.3.210.160/27	10.3.210.161 – 10.3.210.190	10.3.210.191
151	10.3.210.192/27	10.3.210.193 – 10.3.210.222	10.3.210.223
152	10.3.210.224/27	10.3.210.225 – 10.3.210.254	10.3.210.255
153	10.3.211.0/27	10.3.211.1 – 10.3.211.30	10.3.211.31
154	10.3.211.32/27	10.3.211.33 – 10.3.211.62	10.3.211.63
155	10.3.211.64/27	10.3.211.65 – 10.3.211.94	10.3.211.95
156	10.3.211.96/27	10.3.211.97 – 10.3.211.126	10.3.211.127
157	10.3.211.128/27	10.3.211.129 – 10.3.211.158	10.3.211.159
158	10.3.211.160/27	10.3.211.161 – 10.3.211.190	10.3.211.191
159	10.3.211.192/27	10.3.211.193 – 10.3.211.222	10.3.211.223
160	10.3.211.224/27	10.3.211.225 – 10.3.211.254	10.3.211.255
161	10.3.212.0/27	10.3.212.1 – 10.3.212.30	10.3.212.31
162	10.3.212.32/27	10.3.212.33 – 10.3.212.62	10.3.212.63
163	10.3.212.64/27	10.3.212.65 – 10.3.212.94	10.3.212.95
164	10.3.212.96/27	10.3.212.97 – 10.3.212.126	10.3.212.127
165	10.3.212.128/27	10.3.212.129 – 10.3.212.158	10.3.212.159
166	10.3.212.160/27	10.3.212.161 – 10.3.212.190	10.3.212.191
167	10.3.212.192/27	10.3.212.193 – 10.3.212.222	10.3.212.223
168	10.3.212.224/27	10.3.212.225 – 10.3.212.254	10.3.212.255
169	10.3.213.0/27	10.3.213.1 – 10.3.213.30	10.3.213.31
170	10.3.213.32/27	10.3.213.33 – 10.3.213.62	10.3.213.63
171	10.3.213.64/27	10.3.213.65 – 10.3.213.94	10.3.213.95
172	10.3.213.96/27	10.3.213.97 – 10.3.213.126	10.3.213.127
173	10.3.213.128/27	10.3.213.129 – 10.3.213.158	10.3.213.159
174	10.3.213.160/27	10.3.213.161 – 10.3.213.190	10.3.213.191
175	10.3.213.192/27	10.3.213.193 – 10.3.213.222	10.3.213.223
176	10.3.213.224/27	10.3.213.225 – 10.3.213.254	10.3.213.255
177	10.3.214.0/27	10.3.214.1 – 10.3.214.30	10.3.214.31
178	10.3.214.32/27	10.3.214.33 – 10.3.214.62	10.3.214.63
179	10.3.214.64/27	10.3.214.65 – 10.3.214.94	10.3.214.95
180	10.3.214.96/27	10.3.214.97 – 10.3.214.126	10.3.214.127
181	10.3.214.128/27	10.3.214.129 – 10.3.214.158	10.3.214.159
182	10.3.214.160/27	10.3.214.161 – 10.3.214.190	10.3.214.191
183	10.3.214.192/27	10.3.214.193 – 10.3.214.222	10.3.214.223
184	10.3.214.224/27	10.3.214.225 – 10.3.214.254	10.3.214.255
185	10.3.215.0/27	10.3.215.1 – 10.3.215.30	10.3.215.31
186	10.3.215.32/27	10.3.215.33 – 10.3.215.62	10.3.215.63
187	10.3.215.64/27	10.3.215.65 – 10.3.215.94	10.3.215.95
188	10.3.215.96/27	10.3.215.97 – 10.3.215.126	10.3.215.127
189	10.3.215.128/27	10.3.215.129 – 10.3.215.158	10.3.215.159
190	10.3.215.160/27	10.3.215.161 – 10.3.215.190	10.3.215.191
191	10.3.215.192/27	10.3.215.193 – 10.3.215.222	10.3.215.223
192	10.3.215.224/27	10.3.215.225 – 10.3.215.254	10.3.215.255
193	10.3.216.0/27	10.3.216.1 – 10.3.216.30	10.3.216.31
194	10.3.216.32/27	10.3.216.33 – 10.3.216.62	10.3.216.63
195	10.3.216.64/27	10.3.216.65 – 10.3.216.94	10.3.216.95
196	10.3.216.96/27	10.3.216.97 – 10.3.216.126	10.3.216.127
197	10.3.216.128/27	10.3.216.129 – 10.3.216.158	10.3.216.159
198	10.3.216.160/27	10.3.216.161 – 10.3.216.190	10.3.216.191
199	10.3.216.192/27	10.3.216.193 – 10.3.216.222	10.3.216.223
200	10.3.216.224/27	10.3.216.225 – 10.3.216.254	10.3.216.255
201	10.3.217.0/27	10.3.217.1 – 10.3.217.30	10.3.217.31
202	10.3.217.32/27	10.3.217.33 – 10.3.217.62	10.3.217.63
203	10.3.217.64/27	10.3.217.65 – 10.3.217.94	10.3.217.95
204	10.3.217.96/27	10.3.217.97 – 10.3.217.126	10.3.217.127
205	10.3.217.128/27	10.3.217.129 – 10.3.217.158	10.3.217.159
206	10.3.217.160/27	10.3.217.161 – 10.3.217.190	10.3.217.191
207	10.3.217.192/27	10.3.217.193 – 10.3.217.222	10.3.217.223
208	10.3.217.224/27	10.3.217.225 – 10.3.217.254	10.3.217.255
209	10.3.218.0/27	10.3.218.1 – 10.3.218.30	10.3.218.31
210	10.3.218.32/27	10.3.218.33 – 10.3.218.62	10.3.218.63
211	10.3.218.64/27	10.3.218.65 – 10.3.218.94	10.3.218.95
212	10.3.218.96/27	10.3.218.97 – 10.3.218.126	10.3.218.127
213	10.3.218.128/27	10.3.218.129 – 10.3.218.158	10.3.218.159
214	10.3.218.160/27	10.3.218.161 – 10.3.218.190	10.3.218.191
215	10.3.218.192/27	10.3.218.193 – 10.3.218.222	10.3.218.223
216	10.3.218.224/27	10.3.218.225 – 10.3.218.254	10.3.218.255
217	10.3.219.0/27	10.3.219.1 – 10.3.219.30	10.3.219.31
218	10.3.219.32/27	10.3.219.33 – 10.3.219.62	10.3.219.63
219	10.3.219.64/27	10.3.219.65 – 10.3.219.94	10.3.219.95
220	10.3.219.96/27	10.3.219.97 – 10.3.219.126	10.3.219.127
221	10.3.219.128/27	10.3.219.129 – 10.3.219.158	10.3.219.159
222	10.3.219.160/27	10.3.219.161 – 10.3.219.190	10.3.219.191
223	10.3.219.192/27	10.3.219.193 – 10.3.219.222	10.3.219.223
224	10.3.219.224/27	10.3.219.225 – 10.3.219.254	10.3.219.255
225	10.3.220.0/27	10.3.220.1 – 10.3.220.30	10.3.220.31
226	10.3.220.32/27	10.3.220.33 – 10.3.220.62	10.3.220.63
227	10.3.220.64/27	10.3.220.65 – 10.3.220.94	10.3.220.95
228	10.3.220.96/27	10.3.220.97 – 10.3.220.126	10.3.220.127
229	10.3.220.128/27	10.3.220.129 – 10.3.220.158	10.3.220.159
230	10.3.220.160/27	10.3.220.161 – 10.3.220.190	10.3.220.191
231	10.3.220.192/27	10.3.220.193 – 10.3.220.222	10.3.220.223
232	10.3.220.224/27	10.3.220.225 – 10.3.220.254	10.3.220.255
233	10.3.221.0/27	10.3.221.1 – 10.3.221.30	10.3.221.31
234	10.3.221.32/27	10.3.221.33 – 10.3.221.62	10.3.221.63
235	10.3.221.64/27	10.3.221.65 – 10.3.221.94	10.3.221.95
236	10.3.221.96/27	10.3.221.97 – 10.3.221.126	10.3.221.127
237	10.3.221.128/27	10.3.221.129 – 10.3.221.158	10.3.221.159
238	10.3.221.160/27	10.3.221.161 – 10.3.221.190	10.3.221.191
239	10.3.221.192/27	10.3.221.193 – 10.3.221.222	10.3.221.223
240	10.3.221.224/27	10.3.221.225 – 10.3.221.254	10.3.221.255
241	10.3.222.0/27	10.3.222.1 – 10.3.222.30	10.3.222.31
242	10.3.222.32/27	10.3.222.33 – 10.3.222.62	10.3.222.63
243	10.3.222.64/27	10.3.222.65 – 10.3.222.94	10.3.222.95
244	10.3.222.96/27	10.3.222.97 – 10.3.222.126	10.3.222.127
245	10.3.222.128/27	10.3.222.129 – 10.3.222.158	10.3.222.159
246	10.3.222.160/27	10.3.222.161 – 10.3.222.190	10.3.222.191
247	10.3.222.192/27	10.3.222.193 – 10.3.222.222	10.3.222.223
248	10.3.222.224/27	10.3.222.225 – 10.3.222.254	10.3.222.255
249	10.3.223.0/27	10.3.223.1 – 10.3.223.30	10.3.223.31
250	10.3.223.32/27	10.3.223.33 – 10.3.223.62	10.3.223.63
251	10.3.223.64/27	10.3.223.65 – 10.3.223.94	10.3.223.95
252	10.3.223.96/27	10.3.223.97 – 10.3.223.126	10.3.223.127
253	10.3.223.128/27	10.3.223.129 – 10.3.223.158	10.3.223.159
254	10.3.223.160/27	10.3.223.161 – 10.3.223.190	10.3.223.191
255	10.3.223.192/27	10.3.223.193 – 10.3.223.222	10.3.223.223
256	10.3.223.224/27	10.3.223.225 – 10.3.223.254	10.3.223.255

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 →