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)10.3.192.0/19

network10.3.192.0/19

broadcast10.3.223.255

first host10.3.192.1

last host10.3.223.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.3.192.0/19

address00001010.00000011.11000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00000011.11000000.00000000

broadcast00001010.00000011.11011111.11111111

green = network part, grey = host part

hex0x0a03c000

decimal168017920

reverse dns0.192.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c000

/19 split into /28 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/28	10.3.192.1 – 10.3.192.14	10.3.192.15
2	10.3.192.16/28	10.3.192.17 – 10.3.192.30	10.3.192.31
3	10.3.192.32/28	10.3.192.33 – 10.3.192.46	10.3.192.47
4	10.3.192.48/28	10.3.192.49 – 10.3.192.62	10.3.192.63
5	10.3.192.64/28	10.3.192.65 – 10.3.192.78	10.3.192.79
6	10.3.192.80/28	10.3.192.81 – 10.3.192.94	10.3.192.95
7	10.3.192.96/28	10.3.192.97 – 10.3.192.110	10.3.192.111
8	10.3.192.112/28	10.3.192.113 – 10.3.192.126	10.3.192.127
9	10.3.192.128/28	10.3.192.129 – 10.3.192.142	10.3.192.143
10	10.3.192.144/28	10.3.192.145 – 10.3.192.158	10.3.192.159
11	10.3.192.160/28	10.3.192.161 – 10.3.192.174	10.3.192.175
12	10.3.192.176/28	10.3.192.177 – 10.3.192.190	10.3.192.191
13	10.3.192.192/28	10.3.192.193 – 10.3.192.206	10.3.192.207
14	10.3.192.208/28	10.3.192.209 – 10.3.192.222	10.3.192.223
15	10.3.192.224/28	10.3.192.225 – 10.3.192.238	10.3.192.239
16	10.3.192.240/28	10.3.192.241 – 10.3.192.254	10.3.192.255
17	10.3.193.0/28	10.3.193.1 – 10.3.193.14	10.3.193.15
18	10.3.193.16/28	10.3.193.17 – 10.3.193.30	10.3.193.31
19	10.3.193.32/28	10.3.193.33 – 10.3.193.46	10.3.193.47
20	10.3.193.48/28	10.3.193.49 – 10.3.193.62	10.3.193.63
21	10.3.193.64/28	10.3.193.65 – 10.3.193.78	10.3.193.79
22	10.3.193.80/28	10.3.193.81 – 10.3.193.94	10.3.193.95
23	10.3.193.96/28	10.3.193.97 – 10.3.193.110	10.3.193.111
24	10.3.193.112/28	10.3.193.113 – 10.3.193.126	10.3.193.127
25	10.3.193.128/28	10.3.193.129 – 10.3.193.142	10.3.193.143
26	10.3.193.144/28	10.3.193.145 – 10.3.193.158	10.3.193.159
27	10.3.193.160/28	10.3.193.161 – 10.3.193.174	10.3.193.175
28	10.3.193.176/28	10.3.193.177 – 10.3.193.190	10.3.193.191
29	10.3.193.192/28	10.3.193.193 – 10.3.193.206	10.3.193.207
30	10.3.193.208/28	10.3.193.209 – 10.3.193.222	10.3.193.223
31	10.3.193.224/28	10.3.193.225 – 10.3.193.238	10.3.193.239
32	10.3.193.240/28	10.3.193.241 – 10.3.193.254	10.3.193.255
33	10.3.194.0/28	10.3.194.1 – 10.3.194.14	10.3.194.15
34	10.3.194.16/28	10.3.194.17 – 10.3.194.30	10.3.194.31
35	10.3.194.32/28	10.3.194.33 – 10.3.194.46	10.3.194.47
36	10.3.194.48/28	10.3.194.49 – 10.3.194.62	10.3.194.63
37	10.3.194.64/28	10.3.194.65 – 10.3.194.78	10.3.194.79
38	10.3.194.80/28	10.3.194.81 – 10.3.194.94	10.3.194.95
39	10.3.194.96/28	10.3.194.97 – 10.3.194.110	10.3.194.111
40	10.3.194.112/28	10.3.194.113 – 10.3.194.126	10.3.194.127
41	10.3.194.128/28	10.3.194.129 – 10.3.194.142	10.3.194.143
42	10.3.194.144/28	10.3.194.145 – 10.3.194.158	10.3.194.159
43	10.3.194.160/28	10.3.194.161 – 10.3.194.174	10.3.194.175
44	10.3.194.176/28	10.3.194.177 – 10.3.194.190	10.3.194.191
45	10.3.194.192/28	10.3.194.193 – 10.3.194.206	10.3.194.207
46	10.3.194.208/28	10.3.194.209 – 10.3.194.222	10.3.194.223
47	10.3.194.224/28	10.3.194.225 – 10.3.194.238	10.3.194.239
48	10.3.194.240/28	10.3.194.241 – 10.3.194.254	10.3.194.255
49	10.3.195.0/28	10.3.195.1 – 10.3.195.14	10.3.195.15
50	10.3.195.16/28	10.3.195.17 – 10.3.195.30	10.3.195.31
51	10.3.195.32/28	10.3.195.33 – 10.3.195.46	10.3.195.47
52	10.3.195.48/28	10.3.195.49 – 10.3.195.62	10.3.195.63
53	10.3.195.64/28	10.3.195.65 – 10.3.195.78	10.3.195.79
54	10.3.195.80/28	10.3.195.81 – 10.3.195.94	10.3.195.95
55	10.3.195.96/28	10.3.195.97 – 10.3.195.110	10.3.195.111
56	10.3.195.112/28	10.3.195.113 – 10.3.195.126	10.3.195.127
57	10.3.195.128/28	10.3.195.129 – 10.3.195.142	10.3.195.143
58	10.3.195.144/28	10.3.195.145 – 10.3.195.158	10.3.195.159
59	10.3.195.160/28	10.3.195.161 – 10.3.195.174	10.3.195.175
60	10.3.195.176/28	10.3.195.177 – 10.3.195.190	10.3.195.191
61	10.3.195.192/28	10.3.195.193 – 10.3.195.206	10.3.195.207
62	10.3.195.208/28	10.3.195.209 – 10.3.195.222	10.3.195.223
63	10.3.195.224/28	10.3.195.225 – 10.3.195.238	10.3.195.239
64	10.3.195.240/28	10.3.195.241 – 10.3.195.254	10.3.195.255
65	10.3.196.0/28	10.3.196.1 – 10.3.196.14	10.3.196.15
66	10.3.196.16/28	10.3.196.17 – 10.3.196.30	10.3.196.31
67	10.3.196.32/28	10.3.196.33 – 10.3.196.46	10.3.196.47
68	10.3.196.48/28	10.3.196.49 – 10.3.196.62	10.3.196.63
69	10.3.196.64/28	10.3.196.65 – 10.3.196.78	10.3.196.79
70	10.3.196.80/28	10.3.196.81 – 10.3.196.94	10.3.196.95
71	10.3.196.96/28	10.3.196.97 – 10.3.196.110	10.3.196.111
72	10.3.196.112/28	10.3.196.113 – 10.3.196.126	10.3.196.127
73	10.3.196.128/28	10.3.196.129 – 10.3.196.142	10.3.196.143
74	10.3.196.144/28	10.3.196.145 – 10.3.196.158	10.3.196.159
75	10.3.196.160/28	10.3.196.161 – 10.3.196.174	10.3.196.175
76	10.3.196.176/28	10.3.196.177 – 10.3.196.190	10.3.196.191
77	10.3.196.192/28	10.3.196.193 – 10.3.196.206	10.3.196.207
78	10.3.196.208/28	10.3.196.209 – 10.3.196.222	10.3.196.223
79	10.3.196.224/28	10.3.196.225 – 10.3.196.238	10.3.196.239
80	10.3.196.240/28	10.3.196.241 – 10.3.196.254	10.3.196.255
81	10.3.197.0/28	10.3.197.1 – 10.3.197.14	10.3.197.15
82	10.3.197.16/28	10.3.197.17 – 10.3.197.30	10.3.197.31
83	10.3.197.32/28	10.3.197.33 – 10.3.197.46	10.3.197.47
84	10.3.197.48/28	10.3.197.49 – 10.3.197.62	10.3.197.63
85	10.3.197.64/28	10.3.197.65 – 10.3.197.78	10.3.197.79
86	10.3.197.80/28	10.3.197.81 – 10.3.197.94	10.3.197.95
87	10.3.197.96/28	10.3.197.97 – 10.3.197.110	10.3.197.111
88	10.3.197.112/28	10.3.197.113 – 10.3.197.126	10.3.197.127
89	10.3.197.128/28	10.3.197.129 – 10.3.197.142	10.3.197.143
90	10.3.197.144/28	10.3.197.145 – 10.3.197.158	10.3.197.159
91	10.3.197.160/28	10.3.197.161 – 10.3.197.174	10.3.197.175
92	10.3.197.176/28	10.3.197.177 – 10.3.197.190	10.3.197.191
93	10.3.197.192/28	10.3.197.193 – 10.3.197.206	10.3.197.207
94	10.3.197.208/28	10.3.197.209 – 10.3.197.222	10.3.197.223
95	10.3.197.224/28	10.3.197.225 – 10.3.197.238	10.3.197.239
96	10.3.197.240/28	10.3.197.241 – 10.3.197.254	10.3.197.255
97	10.3.198.0/28	10.3.198.1 – 10.3.198.14	10.3.198.15
98	10.3.198.16/28	10.3.198.17 – 10.3.198.30	10.3.198.31
99	10.3.198.32/28	10.3.198.33 – 10.3.198.46	10.3.198.47
100	10.3.198.48/28	10.3.198.49 – 10.3.198.62	10.3.198.63
101	10.3.198.64/28	10.3.198.65 – 10.3.198.78	10.3.198.79
102	10.3.198.80/28	10.3.198.81 – 10.3.198.94	10.3.198.95
103	10.3.198.96/28	10.3.198.97 – 10.3.198.110	10.3.198.111
104	10.3.198.112/28	10.3.198.113 – 10.3.198.126	10.3.198.127
105	10.3.198.128/28	10.3.198.129 – 10.3.198.142	10.3.198.143
106	10.3.198.144/28	10.3.198.145 – 10.3.198.158	10.3.198.159
107	10.3.198.160/28	10.3.198.161 – 10.3.198.174	10.3.198.175
108	10.3.198.176/28	10.3.198.177 – 10.3.198.190	10.3.198.191
109	10.3.198.192/28	10.3.198.193 – 10.3.198.206	10.3.198.207
110	10.3.198.208/28	10.3.198.209 – 10.3.198.222	10.3.198.223
111	10.3.198.224/28	10.3.198.225 – 10.3.198.238	10.3.198.239
112	10.3.198.240/28	10.3.198.241 – 10.3.198.254	10.3.198.255
113	10.3.199.0/28	10.3.199.1 – 10.3.199.14	10.3.199.15
114	10.3.199.16/28	10.3.199.17 – 10.3.199.30	10.3.199.31
115	10.3.199.32/28	10.3.199.33 – 10.3.199.46	10.3.199.47
116	10.3.199.48/28	10.3.199.49 – 10.3.199.62	10.3.199.63
117	10.3.199.64/28	10.3.199.65 – 10.3.199.78	10.3.199.79
118	10.3.199.80/28	10.3.199.81 – 10.3.199.94	10.3.199.95
119	10.3.199.96/28	10.3.199.97 – 10.3.199.110	10.3.199.111
120	10.3.199.112/28	10.3.199.113 – 10.3.199.126	10.3.199.127
121	10.3.199.128/28	10.3.199.129 – 10.3.199.142	10.3.199.143
122	10.3.199.144/28	10.3.199.145 – 10.3.199.158	10.3.199.159
123	10.3.199.160/28	10.3.199.161 – 10.3.199.174	10.3.199.175
124	10.3.199.176/28	10.3.199.177 – 10.3.199.190	10.3.199.191
125	10.3.199.192/28	10.3.199.193 – 10.3.199.206	10.3.199.207
126	10.3.199.208/28	10.3.199.209 – 10.3.199.222	10.3.199.223
127	10.3.199.224/28	10.3.199.225 – 10.3.199.238	10.3.199.239
128	10.3.199.240/28	10.3.199.241 – 10.3.199.254	10.3.199.255
129	10.3.200.0/28	10.3.200.1 – 10.3.200.14	10.3.200.15
130	10.3.200.16/28	10.3.200.17 – 10.3.200.30	10.3.200.31
131	10.3.200.32/28	10.3.200.33 – 10.3.200.46	10.3.200.47
132	10.3.200.48/28	10.3.200.49 – 10.3.200.62	10.3.200.63
133	10.3.200.64/28	10.3.200.65 – 10.3.200.78	10.3.200.79
134	10.3.200.80/28	10.3.200.81 – 10.3.200.94	10.3.200.95
135	10.3.200.96/28	10.3.200.97 – 10.3.200.110	10.3.200.111
136	10.3.200.112/28	10.3.200.113 – 10.3.200.126	10.3.200.127
137	10.3.200.128/28	10.3.200.129 – 10.3.200.142	10.3.200.143
138	10.3.200.144/28	10.3.200.145 – 10.3.200.158	10.3.200.159
139	10.3.200.160/28	10.3.200.161 – 10.3.200.174	10.3.200.175
140	10.3.200.176/28	10.3.200.177 – 10.3.200.190	10.3.200.191
141	10.3.200.192/28	10.3.200.193 – 10.3.200.206	10.3.200.207
142	10.3.200.208/28	10.3.200.209 – 10.3.200.222	10.3.200.223
143	10.3.200.224/28	10.3.200.225 – 10.3.200.238	10.3.200.239
144	10.3.200.240/28	10.3.200.241 – 10.3.200.254	10.3.200.255
145	10.3.201.0/28	10.3.201.1 – 10.3.201.14	10.3.201.15
146	10.3.201.16/28	10.3.201.17 – 10.3.201.30	10.3.201.31
147	10.3.201.32/28	10.3.201.33 – 10.3.201.46	10.3.201.47
148	10.3.201.48/28	10.3.201.49 – 10.3.201.62	10.3.201.63
149	10.3.201.64/28	10.3.201.65 – 10.3.201.78	10.3.201.79
150	10.3.201.80/28	10.3.201.81 – 10.3.201.94	10.3.201.95
151	10.3.201.96/28	10.3.201.97 – 10.3.201.110	10.3.201.111
152	10.3.201.112/28	10.3.201.113 – 10.3.201.126	10.3.201.127
153	10.3.201.128/28	10.3.201.129 – 10.3.201.142	10.3.201.143
154	10.3.201.144/28	10.3.201.145 – 10.3.201.158	10.3.201.159
155	10.3.201.160/28	10.3.201.161 – 10.3.201.174	10.3.201.175
156	10.3.201.176/28	10.3.201.177 – 10.3.201.190	10.3.201.191
157	10.3.201.192/28	10.3.201.193 – 10.3.201.206	10.3.201.207
158	10.3.201.208/28	10.3.201.209 – 10.3.201.222	10.3.201.223
159	10.3.201.224/28	10.3.201.225 – 10.3.201.238	10.3.201.239
160	10.3.201.240/28	10.3.201.241 – 10.3.201.254	10.3.201.255
161	10.3.202.0/28	10.3.202.1 – 10.3.202.14	10.3.202.15
162	10.3.202.16/28	10.3.202.17 – 10.3.202.30	10.3.202.31
163	10.3.202.32/28	10.3.202.33 – 10.3.202.46	10.3.202.47
164	10.3.202.48/28	10.3.202.49 – 10.3.202.62	10.3.202.63
165	10.3.202.64/28	10.3.202.65 – 10.3.202.78	10.3.202.79
166	10.3.202.80/28	10.3.202.81 – 10.3.202.94	10.3.202.95
167	10.3.202.96/28	10.3.202.97 – 10.3.202.110	10.3.202.111
168	10.3.202.112/28	10.3.202.113 – 10.3.202.126	10.3.202.127
169	10.3.202.128/28	10.3.202.129 – 10.3.202.142	10.3.202.143
170	10.3.202.144/28	10.3.202.145 – 10.3.202.158	10.3.202.159
171	10.3.202.160/28	10.3.202.161 – 10.3.202.174	10.3.202.175
172	10.3.202.176/28	10.3.202.177 – 10.3.202.190	10.3.202.191
173	10.3.202.192/28	10.3.202.193 – 10.3.202.206	10.3.202.207
174	10.3.202.208/28	10.3.202.209 – 10.3.202.222	10.3.202.223
175	10.3.202.224/28	10.3.202.225 – 10.3.202.238	10.3.202.239
176	10.3.202.240/28	10.3.202.241 – 10.3.202.254	10.3.202.255
177	10.3.203.0/28	10.3.203.1 – 10.3.203.14	10.3.203.15
178	10.3.203.16/28	10.3.203.17 – 10.3.203.30	10.3.203.31
179	10.3.203.32/28	10.3.203.33 – 10.3.203.46	10.3.203.47
180	10.3.203.48/28	10.3.203.49 – 10.3.203.62	10.3.203.63
181	10.3.203.64/28	10.3.203.65 – 10.3.203.78	10.3.203.79
182	10.3.203.80/28	10.3.203.81 – 10.3.203.94	10.3.203.95
183	10.3.203.96/28	10.3.203.97 – 10.3.203.110	10.3.203.111
184	10.3.203.112/28	10.3.203.113 – 10.3.203.126	10.3.203.127
185	10.3.203.128/28	10.3.203.129 – 10.3.203.142	10.3.203.143
186	10.3.203.144/28	10.3.203.145 – 10.3.203.158	10.3.203.159
187	10.3.203.160/28	10.3.203.161 – 10.3.203.174	10.3.203.175
188	10.3.203.176/28	10.3.203.177 – 10.3.203.190	10.3.203.191
189	10.3.203.192/28	10.3.203.193 – 10.3.203.206	10.3.203.207
190	10.3.203.208/28	10.3.203.209 – 10.3.203.222	10.3.203.223
191	10.3.203.224/28	10.3.203.225 – 10.3.203.238	10.3.203.239
192	10.3.203.240/28	10.3.203.241 – 10.3.203.254	10.3.203.255
193	10.3.204.0/28	10.3.204.1 – 10.3.204.14	10.3.204.15
194	10.3.204.16/28	10.3.204.17 – 10.3.204.30	10.3.204.31
195	10.3.204.32/28	10.3.204.33 – 10.3.204.46	10.3.204.47
196	10.3.204.48/28	10.3.204.49 – 10.3.204.62	10.3.204.63
197	10.3.204.64/28	10.3.204.65 – 10.3.204.78	10.3.204.79
198	10.3.204.80/28	10.3.204.81 – 10.3.204.94	10.3.204.95
199	10.3.204.96/28	10.3.204.97 – 10.3.204.110	10.3.204.111
200	10.3.204.112/28	10.3.204.113 – 10.3.204.126	10.3.204.127
201	10.3.204.128/28	10.3.204.129 – 10.3.204.142	10.3.204.143
202	10.3.204.144/28	10.3.204.145 – 10.3.204.158	10.3.204.159
203	10.3.204.160/28	10.3.204.161 – 10.3.204.174	10.3.204.175
204	10.3.204.176/28	10.3.204.177 – 10.3.204.190	10.3.204.191
205	10.3.204.192/28	10.3.204.193 – 10.3.204.206	10.3.204.207
206	10.3.204.208/28	10.3.204.209 – 10.3.204.222	10.3.204.223
207	10.3.204.224/28	10.3.204.225 – 10.3.204.238	10.3.204.239
208	10.3.204.240/28	10.3.204.241 – 10.3.204.254	10.3.204.255
209	10.3.205.0/28	10.3.205.1 – 10.3.205.14	10.3.205.15
210	10.3.205.16/28	10.3.205.17 – 10.3.205.30	10.3.205.31
211	10.3.205.32/28	10.3.205.33 – 10.3.205.46	10.3.205.47
212	10.3.205.48/28	10.3.205.49 – 10.3.205.62	10.3.205.63
213	10.3.205.64/28	10.3.205.65 – 10.3.205.78	10.3.205.79
214	10.3.205.80/28	10.3.205.81 – 10.3.205.94	10.3.205.95
215	10.3.205.96/28	10.3.205.97 – 10.3.205.110	10.3.205.111
216	10.3.205.112/28	10.3.205.113 – 10.3.205.126	10.3.205.127
217	10.3.205.128/28	10.3.205.129 – 10.3.205.142	10.3.205.143
218	10.3.205.144/28	10.3.205.145 – 10.3.205.158	10.3.205.159
219	10.3.205.160/28	10.3.205.161 – 10.3.205.174	10.3.205.175
220	10.3.205.176/28	10.3.205.177 – 10.3.205.190	10.3.205.191
221	10.3.205.192/28	10.3.205.193 – 10.3.205.206	10.3.205.207
222	10.3.205.208/28	10.3.205.209 – 10.3.205.222	10.3.205.223
223	10.3.205.224/28	10.3.205.225 – 10.3.205.238	10.3.205.239
224	10.3.205.240/28	10.3.205.241 – 10.3.205.254	10.3.205.255
225	10.3.206.0/28	10.3.206.1 – 10.3.206.14	10.3.206.15
226	10.3.206.16/28	10.3.206.17 – 10.3.206.30	10.3.206.31
227	10.3.206.32/28	10.3.206.33 – 10.3.206.46	10.3.206.47
228	10.3.206.48/28	10.3.206.49 – 10.3.206.62	10.3.206.63
229	10.3.206.64/28	10.3.206.65 – 10.3.206.78	10.3.206.79
230	10.3.206.80/28	10.3.206.81 – 10.3.206.94	10.3.206.95
231	10.3.206.96/28	10.3.206.97 – 10.3.206.110	10.3.206.111
232	10.3.206.112/28	10.3.206.113 – 10.3.206.126	10.3.206.127
233	10.3.206.128/28	10.3.206.129 – 10.3.206.142	10.3.206.143
234	10.3.206.144/28	10.3.206.145 – 10.3.206.158	10.3.206.159
235	10.3.206.160/28	10.3.206.161 – 10.3.206.174	10.3.206.175
236	10.3.206.176/28	10.3.206.177 – 10.3.206.190	10.3.206.191
237	10.3.206.192/28	10.3.206.193 – 10.3.206.206	10.3.206.207
238	10.3.206.208/28	10.3.206.209 – 10.3.206.222	10.3.206.223
239	10.3.206.224/28	10.3.206.225 – 10.3.206.238	10.3.206.239
240	10.3.206.240/28	10.3.206.241 – 10.3.206.254	10.3.206.255
241	10.3.207.0/28	10.3.207.1 – 10.3.207.14	10.3.207.15
242	10.3.207.16/28	10.3.207.17 – 10.3.207.30	10.3.207.31
243	10.3.207.32/28	10.3.207.33 – 10.3.207.46	10.3.207.47
244	10.3.207.48/28	10.3.207.49 – 10.3.207.62	10.3.207.63
245	10.3.207.64/28	10.3.207.65 – 10.3.207.78	10.3.207.79
246	10.3.207.80/28	10.3.207.81 – 10.3.207.94	10.3.207.95
247	10.3.207.96/28	10.3.207.97 – 10.3.207.110	10.3.207.111
248	10.3.207.112/28	10.3.207.113 – 10.3.207.126	10.3.207.127
249	10.3.207.128/28	10.3.207.129 – 10.3.207.142	10.3.207.143
250	10.3.207.144/28	10.3.207.145 – 10.3.207.158	10.3.207.159
251	10.3.207.160/28	10.3.207.161 – 10.3.207.174	10.3.207.175
252	10.3.207.176/28	10.3.207.177 – 10.3.207.190	10.3.207.191
253	10.3.207.192/28	10.3.207.193 – 10.3.207.206	10.3.207.207
254	10.3.207.208/28	10.3.207.209 – 10.3.207.222	10.3.207.223
255	10.3.207.224/28	10.3.207.225 – 10.3.207.238	10.3.207.239
256	10.3.207.240/28	10.3.207.241 – 10.3.207.254	10.3.207.255

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 /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 →