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)10.21.32.0/19

network10.21.32.0/19

broadcast10.21.63.255

first host10.21.32.1

last host10.21.63.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.21.32.0/19

address00001010.00010101.00100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010101.00100000.00000000

broadcast00001010.00010101.00111111.11111111

green = network part, grey = host part

hex0x0a152000

decimal169156608

reverse dns0.32.21.10.in-addr.arpa

ipv4-mapped::ffff:a15:2000

/19 split into /28 · 512 subnets

close ×

#	network	host range	broadcast
1	10.21.32.0/28	10.21.32.1 – 10.21.32.14	10.21.32.15
2	10.21.32.16/28	10.21.32.17 – 10.21.32.30	10.21.32.31
3	10.21.32.32/28	10.21.32.33 – 10.21.32.46	10.21.32.47
4	10.21.32.48/28	10.21.32.49 – 10.21.32.62	10.21.32.63
5	10.21.32.64/28	10.21.32.65 – 10.21.32.78	10.21.32.79
6	10.21.32.80/28	10.21.32.81 – 10.21.32.94	10.21.32.95
7	10.21.32.96/28	10.21.32.97 – 10.21.32.110	10.21.32.111
8	10.21.32.112/28	10.21.32.113 – 10.21.32.126	10.21.32.127
9	10.21.32.128/28	10.21.32.129 – 10.21.32.142	10.21.32.143
10	10.21.32.144/28	10.21.32.145 – 10.21.32.158	10.21.32.159
11	10.21.32.160/28	10.21.32.161 – 10.21.32.174	10.21.32.175
12	10.21.32.176/28	10.21.32.177 – 10.21.32.190	10.21.32.191
13	10.21.32.192/28	10.21.32.193 – 10.21.32.206	10.21.32.207
14	10.21.32.208/28	10.21.32.209 – 10.21.32.222	10.21.32.223
15	10.21.32.224/28	10.21.32.225 – 10.21.32.238	10.21.32.239
16	10.21.32.240/28	10.21.32.241 – 10.21.32.254	10.21.32.255
17	10.21.33.0/28	10.21.33.1 – 10.21.33.14	10.21.33.15
18	10.21.33.16/28	10.21.33.17 – 10.21.33.30	10.21.33.31
19	10.21.33.32/28	10.21.33.33 – 10.21.33.46	10.21.33.47
20	10.21.33.48/28	10.21.33.49 – 10.21.33.62	10.21.33.63
21	10.21.33.64/28	10.21.33.65 – 10.21.33.78	10.21.33.79
22	10.21.33.80/28	10.21.33.81 – 10.21.33.94	10.21.33.95
23	10.21.33.96/28	10.21.33.97 – 10.21.33.110	10.21.33.111
24	10.21.33.112/28	10.21.33.113 – 10.21.33.126	10.21.33.127
25	10.21.33.128/28	10.21.33.129 – 10.21.33.142	10.21.33.143
26	10.21.33.144/28	10.21.33.145 – 10.21.33.158	10.21.33.159
27	10.21.33.160/28	10.21.33.161 – 10.21.33.174	10.21.33.175
28	10.21.33.176/28	10.21.33.177 – 10.21.33.190	10.21.33.191
29	10.21.33.192/28	10.21.33.193 – 10.21.33.206	10.21.33.207
30	10.21.33.208/28	10.21.33.209 – 10.21.33.222	10.21.33.223
31	10.21.33.224/28	10.21.33.225 – 10.21.33.238	10.21.33.239
32	10.21.33.240/28	10.21.33.241 – 10.21.33.254	10.21.33.255
33	10.21.34.0/28	10.21.34.1 – 10.21.34.14	10.21.34.15
34	10.21.34.16/28	10.21.34.17 – 10.21.34.30	10.21.34.31
35	10.21.34.32/28	10.21.34.33 – 10.21.34.46	10.21.34.47
36	10.21.34.48/28	10.21.34.49 – 10.21.34.62	10.21.34.63
37	10.21.34.64/28	10.21.34.65 – 10.21.34.78	10.21.34.79
38	10.21.34.80/28	10.21.34.81 – 10.21.34.94	10.21.34.95
39	10.21.34.96/28	10.21.34.97 – 10.21.34.110	10.21.34.111
40	10.21.34.112/28	10.21.34.113 – 10.21.34.126	10.21.34.127
41	10.21.34.128/28	10.21.34.129 – 10.21.34.142	10.21.34.143
42	10.21.34.144/28	10.21.34.145 – 10.21.34.158	10.21.34.159
43	10.21.34.160/28	10.21.34.161 – 10.21.34.174	10.21.34.175
44	10.21.34.176/28	10.21.34.177 – 10.21.34.190	10.21.34.191
45	10.21.34.192/28	10.21.34.193 – 10.21.34.206	10.21.34.207
46	10.21.34.208/28	10.21.34.209 – 10.21.34.222	10.21.34.223
47	10.21.34.224/28	10.21.34.225 – 10.21.34.238	10.21.34.239
48	10.21.34.240/28	10.21.34.241 – 10.21.34.254	10.21.34.255
49	10.21.35.0/28	10.21.35.1 – 10.21.35.14	10.21.35.15
50	10.21.35.16/28	10.21.35.17 – 10.21.35.30	10.21.35.31
51	10.21.35.32/28	10.21.35.33 – 10.21.35.46	10.21.35.47
52	10.21.35.48/28	10.21.35.49 – 10.21.35.62	10.21.35.63
53	10.21.35.64/28	10.21.35.65 – 10.21.35.78	10.21.35.79
54	10.21.35.80/28	10.21.35.81 – 10.21.35.94	10.21.35.95
55	10.21.35.96/28	10.21.35.97 – 10.21.35.110	10.21.35.111
56	10.21.35.112/28	10.21.35.113 – 10.21.35.126	10.21.35.127
57	10.21.35.128/28	10.21.35.129 – 10.21.35.142	10.21.35.143
58	10.21.35.144/28	10.21.35.145 – 10.21.35.158	10.21.35.159
59	10.21.35.160/28	10.21.35.161 – 10.21.35.174	10.21.35.175
60	10.21.35.176/28	10.21.35.177 – 10.21.35.190	10.21.35.191
61	10.21.35.192/28	10.21.35.193 – 10.21.35.206	10.21.35.207
62	10.21.35.208/28	10.21.35.209 – 10.21.35.222	10.21.35.223
63	10.21.35.224/28	10.21.35.225 – 10.21.35.238	10.21.35.239
64	10.21.35.240/28	10.21.35.241 – 10.21.35.254	10.21.35.255
65	10.21.36.0/28	10.21.36.1 – 10.21.36.14	10.21.36.15
66	10.21.36.16/28	10.21.36.17 – 10.21.36.30	10.21.36.31
67	10.21.36.32/28	10.21.36.33 – 10.21.36.46	10.21.36.47
68	10.21.36.48/28	10.21.36.49 – 10.21.36.62	10.21.36.63
69	10.21.36.64/28	10.21.36.65 – 10.21.36.78	10.21.36.79
70	10.21.36.80/28	10.21.36.81 – 10.21.36.94	10.21.36.95
71	10.21.36.96/28	10.21.36.97 – 10.21.36.110	10.21.36.111
72	10.21.36.112/28	10.21.36.113 – 10.21.36.126	10.21.36.127
73	10.21.36.128/28	10.21.36.129 – 10.21.36.142	10.21.36.143
74	10.21.36.144/28	10.21.36.145 – 10.21.36.158	10.21.36.159
75	10.21.36.160/28	10.21.36.161 – 10.21.36.174	10.21.36.175
76	10.21.36.176/28	10.21.36.177 – 10.21.36.190	10.21.36.191
77	10.21.36.192/28	10.21.36.193 – 10.21.36.206	10.21.36.207
78	10.21.36.208/28	10.21.36.209 – 10.21.36.222	10.21.36.223
79	10.21.36.224/28	10.21.36.225 – 10.21.36.238	10.21.36.239
80	10.21.36.240/28	10.21.36.241 – 10.21.36.254	10.21.36.255
81	10.21.37.0/28	10.21.37.1 – 10.21.37.14	10.21.37.15
82	10.21.37.16/28	10.21.37.17 – 10.21.37.30	10.21.37.31
83	10.21.37.32/28	10.21.37.33 – 10.21.37.46	10.21.37.47
84	10.21.37.48/28	10.21.37.49 – 10.21.37.62	10.21.37.63
85	10.21.37.64/28	10.21.37.65 – 10.21.37.78	10.21.37.79
86	10.21.37.80/28	10.21.37.81 – 10.21.37.94	10.21.37.95
87	10.21.37.96/28	10.21.37.97 – 10.21.37.110	10.21.37.111
88	10.21.37.112/28	10.21.37.113 – 10.21.37.126	10.21.37.127
89	10.21.37.128/28	10.21.37.129 – 10.21.37.142	10.21.37.143
90	10.21.37.144/28	10.21.37.145 – 10.21.37.158	10.21.37.159
91	10.21.37.160/28	10.21.37.161 – 10.21.37.174	10.21.37.175
92	10.21.37.176/28	10.21.37.177 – 10.21.37.190	10.21.37.191
93	10.21.37.192/28	10.21.37.193 – 10.21.37.206	10.21.37.207
94	10.21.37.208/28	10.21.37.209 – 10.21.37.222	10.21.37.223
95	10.21.37.224/28	10.21.37.225 – 10.21.37.238	10.21.37.239
96	10.21.37.240/28	10.21.37.241 – 10.21.37.254	10.21.37.255
97	10.21.38.0/28	10.21.38.1 – 10.21.38.14	10.21.38.15
98	10.21.38.16/28	10.21.38.17 – 10.21.38.30	10.21.38.31
99	10.21.38.32/28	10.21.38.33 – 10.21.38.46	10.21.38.47
100	10.21.38.48/28	10.21.38.49 – 10.21.38.62	10.21.38.63
101	10.21.38.64/28	10.21.38.65 – 10.21.38.78	10.21.38.79
102	10.21.38.80/28	10.21.38.81 – 10.21.38.94	10.21.38.95
103	10.21.38.96/28	10.21.38.97 – 10.21.38.110	10.21.38.111
104	10.21.38.112/28	10.21.38.113 – 10.21.38.126	10.21.38.127
105	10.21.38.128/28	10.21.38.129 – 10.21.38.142	10.21.38.143
106	10.21.38.144/28	10.21.38.145 – 10.21.38.158	10.21.38.159
107	10.21.38.160/28	10.21.38.161 – 10.21.38.174	10.21.38.175
108	10.21.38.176/28	10.21.38.177 – 10.21.38.190	10.21.38.191
109	10.21.38.192/28	10.21.38.193 – 10.21.38.206	10.21.38.207
110	10.21.38.208/28	10.21.38.209 – 10.21.38.222	10.21.38.223
111	10.21.38.224/28	10.21.38.225 – 10.21.38.238	10.21.38.239
112	10.21.38.240/28	10.21.38.241 – 10.21.38.254	10.21.38.255
113	10.21.39.0/28	10.21.39.1 – 10.21.39.14	10.21.39.15
114	10.21.39.16/28	10.21.39.17 – 10.21.39.30	10.21.39.31
115	10.21.39.32/28	10.21.39.33 – 10.21.39.46	10.21.39.47
116	10.21.39.48/28	10.21.39.49 – 10.21.39.62	10.21.39.63
117	10.21.39.64/28	10.21.39.65 – 10.21.39.78	10.21.39.79
118	10.21.39.80/28	10.21.39.81 – 10.21.39.94	10.21.39.95
119	10.21.39.96/28	10.21.39.97 – 10.21.39.110	10.21.39.111
120	10.21.39.112/28	10.21.39.113 – 10.21.39.126	10.21.39.127
121	10.21.39.128/28	10.21.39.129 – 10.21.39.142	10.21.39.143
122	10.21.39.144/28	10.21.39.145 – 10.21.39.158	10.21.39.159
123	10.21.39.160/28	10.21.39.161 – 10.21.39.174	10.21.39.175
124	10.21.39.176/28	10.21.39.177 – 10.21.39.190	10.21.39.191
125	10.21.39.192/28	10.21.39.193 – 10.21.39.206	10.21.39.207
126	10.21.39.208/28	10.21.39.209 – 10.21.39.222	10.21.39.223
127	10.21.39.224/28	10.21.39.225 – 10.21.39.238	10.21.39.239
128	10.21.39.240/28	10.21.39.241 – 10.21.39.254	10.21.39.255
129	10.21.40.0/28	10.21.40.1 – 10.21.40.14	10.21.40.15
130	10.21.40.16/28	10.21.40.17 – 10.21.40.30	10.21.40.31
131	10.21.40.32/28	10.21.40.33 – 10.21.40.46	10.21.40.47
132	10.21.40.48/28	10.21.40.49 – 10.21.40.62	10.21.40.63
133	10.21.40.64/28	10.21.40.65 – 10.21.40.78	10.21.40.79
134	10.21.40.80/28	10.21.40.81 – 10.21.40.94	10.21.40.95
135	10.21.40.96/28	10.21.40.97 – 10.21.40.110	10.21.40.111
136	10.21.40.112/28	10.21.40.113 – 10.21.40.126	10.21.40.127
137	10.21.40.128/28	10.21.40.129 – 10.21.40.142	10.21.40.143
138	10.21.40.144/28	10.21.40.145 – 10.21.40.158	10.21.40.159
139	10.21.40.160/28	10.21.40.161 – 10.21.40.174	10.21.40.175
140	10.21.40.176/28	10.21.40.177 – 10.21.40.190	10.21.40.191
141	10.21.40.192/28	10.21.40.193 – 10.21.40.206	10.21.40.207
142	10.21.40.208/28	10.21.40.209 – 10.21.40.222	10.21.40.223
143	10.21.40.224/28	10.21.40.225 – 10.21.40.238	10.21.40.239
144	10.21.40.240/28	10.21.40.241 – 10.21.40.254	10.21.40.255
145	10.21.41.0/28	10.21.41.1 – 10.21.41.14	10.21.41.15
146	10.21.41.16/28	10.21.41.17 – 10.21.41.30	10.21.41.31
147	10.21.41.32/28	10.21.41.33 – 10.21.41.46	10.21.41.47
148	10.21.41.48/28	10.21.41.49 – 10.21.41.62	10.21.41.63
149	10.21.41.64/28	10.21.41.65 – 10.21.41.78	10.21.41.79
150	10.21.41.80/28	10.21.41.81 – 10.21.41.94	10.21.41.95
151	10.21.41.96/28	10.21.41.97 – 10.21.41.110	10.21.41.111
152	10.21.41.112/28	10.21.41.113 – 10.21.41.126	10.21.41.127
153	10.21.41.128/28	10.21.41.129 – 10.21.41.142	10.21.41.143
154	10.21.41.144/28	10.21.41.145 – 10.21.41.158	10.21.41.159
155	10.21.41.160/28	10.21.41.161 – 10.21.41.174	10.21.41.175
156	10.21.41.176/28	10.21.41.177 – 10.21.41.190	10.21.41.191
157	10.21.41.192/28	10.21.41.193 – 10.21.41.206	10.21.41.207
158	10.21.41.208/28	10.21.41.209 – 10.21.41.222	10.21.41.223
159	10.21.41.224/28	10.21.41.225 – 10.21.41.238	10.21.41.239
160	10.21.41.240/28	10.21.41.241 – 10.21.41.254	10.21.41.255
161	10.21.42.0/28	10.21.42.1 – 10.21.42.14	10.21.42.15
162	10.21.42.16/28	10.21.42.17 – 10.21.42.30	10.21.42.31
163	10.21.42.32/28	10.21.42.33 – 10.21.42.46	10.21.42.47
164	10.21.42.48/28	10.21.42.49 – 10.21.42.62	10.21.42.63
165	10.21.42.64/28	10.21.42.65 – 10.21.42.78	10.21.42.79
166	10.21.42.80/28	10.21.42.81 – 10.21.42.94	10.21.42.95
167	10.21.42.96/28	10.21.42.97 – 10.21.42.110	10.21.42.111
168	10.21.42.112/28	10.21.42.113 – 10.21.42.126	10.21.42.127
169	10.21.42.128/28	10.21.42.129 – 10.21.42.142	10.21.42.143
170	10.21.42.144/28	10.21.42.145 – 10.21.42.158	10.21.42.159
171	10.21.42.160/28	10.21.42.161 – 10.21.42.174	10.21.42.175
172	10.21.42.176/28	10.21.42.177 – 10.21.42.190	10.21.42.191
173	10.21.42.192/28	10.21.42.193 – 10.21.42.206	10.21.42.207
174	10.21.42.208/28	10.21.42.209 – 10.21.42.222	10.21.42.223
175	10.21.42.224/28	10.21.42.225 – 10.21.42.238	10.21.42.239
176	10.21.42.240/28	10.21.42.241 – 10.21.42.254	10.21.42.255
177	10.21.43.0/28	10.21.43.1 – 10.21.43.14	10.21.43.15
178	10.21.43.16/28	10.21.43.17 – 10.21.43.30	10.21.43.31
179	10.21.43.32/28	10.21.43.33 – 10.21.43.46	10.21.43.47
180	10.21.43.48/28	10.21.43.49 – 10.21.43.62	10.21.43.63
181	10.21.43.64/28	10.21.43.65 – 10.21.43.78	10.21.43.79
182	10.21.43.80/28	10.21.43.81 – 10.21.43.94	10.21.43.95
183	10.21.43.96/28	10.21.43.97 – 10.21.43.110	10.21.43.111
184	10.21.43.112/28	10.21.43.113 – 10.21.43.126	10.21.43.127
185	10.21.43.128/28	10.21.43.129 – 10.21.43.142	10.21.43.143
186	10.21.43.144/28	10.21.43.145 – 10.21.43.158	10.21.43.159
187	10.21.43.160/28	10.21.43.161 – 10.21.43.174	10.21.43.175
188	10.21.43.176/28	10.21.43.177 – 10.21.43.190	10.21.43.191
189	10.21.43.192/28	10.21.43.193 – 10.21.43.206	10.21.43.207
190	10.21.43.208/28	10.21.43.209 – 10.21.43.222	10.21.43.223
191	10.21.43.224/28	10.21.43.225 – 10.21.43.238	10.21.43.239
192	10.21.43.240/28	10.21.43.241 – 10.21.43.254	10.21.43.255
193	10.21.44.0/28	10.21.44.1 – 10.21.44.14	10.21.44.15
194	10.21.44.16/28	10.21.44.17 – 10.21.44.30	10.21.44.31
195	10.21.44.32/28	10.21.44.33 – 10.21.44.46	10.21.44.47
196	10.21.44.48/28	10.21.44.49 – 10.21.44.62	10.21.44.63
197	10.21.44.64/28	10.21.44.65 – 10.21.44.78	10.21.44.79
198	10.21.44.80/28	10.21.44.81 – 10.21.44.94	10.21.44.95
199	10.21.44.96/28	10.21.44.97 – 10.21.44.110	10.21.44.111
200	10.21.44.112/28	10.21.44.113 – 10.21.44.126	10.21.44.127
201	10.21.44.128/28	10.21.44.129 – 10.21.44.142	10.21.44.143
202	10.21.44.144/28	10.21.44.145 – 10.21.44.158	10.21.44.159
203	10.21.44.160/28	10.21.44.161 – 10.21.44.174	10.21.44.175
204	10.21.44.176/28	10.21.44.177 – 10.21.44.190	10.21.44.191
205	10.21.44.192/28	10.21.44.193 – 10.21.44.206	10.21.44.207
206	10.21.44.208/28	10.21.44.209 – 10.21.44.222	10.21.44.223
207	10.21.44.224/28	10.21.44.225 – 10.21.44.238	10.21.44.239
208	10.21.44.240/28	10.21.44.241 – 10.21.44.254	10.21.44.255
209	10.21.45.0/28	10.21.45.1 – 10.21.45.14	10.21.45.15
210	10.21.45.16/28	10.21.45.17 – 10.21.45.30	10.21.45.31
211	10.21.45.32/28	10.21.45.33 – 10.21.45.46	10.21.45.47
212	10.21.45.48/28	10.21.45.49 – 10.21.45.62	10.21.45.63
213	10.21.45.64/28	10.21.45.65 – 10.21.45.78	10.21.45.79
214	10.21.45.80/28	10.21.45.81 – 10.21.45.94	10.21.45.95
215	10.21.45.96/28	10.21.45.97 – 10.21.45.110	10.21.45.111
216	10.21.45.112/28	10.21.45.113 – 10.21.45.126	10.21.45.127
217	10.21.45.128/28	10.21.45.129 – 10.21.45.142	10.21.45.143
218	10.21.45.144/28	10.21.45.145 – 10.21.45.158	10.21.45.159
219	10.21.45.160/28	10.21.45.161 – 10.21.45.174	10.21.45.175
220	10.21.45.176/28	10.21.45.177 – 10.21.45.190	10.21.45.191
221	10.21.45.192/28	10.21.45.193 – 10.21.45.206	10.21.45.207
222	10.21.45.208/28	10.21.45.209 – 10.21.45.222	10.21.45.223
223	10.21.45.224/28	10.21.45.225 – 10.21.45.238	10.21.45.239
224	10.21.45.240/28	10.21.45.241 – 10.21.45.254	10.21.45.255
225	10.21.46.0/28	10.21.46.1 – 10.21.46.14	10.21.46.15
226	10.21.46.16/28	10.21.46.17 – 10.21.46.30	10.21.46.31
227	10.21.46.32/28	10.21.46.33 – 10.21.46.46	10.21.46.47
228	10.21.46.48/28	10.21.46.49 – 10.21.46.62	10.21.46.63
229	10.21.46.64/28	10.21.46.65 – 10.21.46.78	10.21.46.79
230	10.21.46.80/28	10.21.46.81 – 10.21.46.94	10.21.46.95
231	10.21.46.96/28	10.21.46.97 – 10.21.46.110	10.21.46.111
232	10.21.46.112/28	10.21.46.113 – 10.21.46.126	10.21.46.127
233	10.21.46.128/28	10.21.46.129 – 10.21.46.142	10.21.46.143
234	10.21.46.144/28	10.21.46.145 – 10.21.46.158	10.21.46.159
235	10.21.46.160/28	10.21.46.161 – 10.21.46.174	10.21.46.175
236	10.21.46.176/28	10.21.46.177 – 10.21.46.190	10.21.46.191
237	10.21.46.192/28	10.21.46.193 – 10.21.46.206	10.21.46.207
238	10.21.46.208/28	10.21.46.209 – 10.21.46.222	10.21.46.223
239	10.21.46.224/28	10.21.46.225 – 10.21.46.238	10.21.46.239
240	10.21.46.240/28	10.21.46.241 – 10.21.46.254	10.21.46.255
241	10.21.47.0/28	10.21.47.1 – 10.21.47.14	10.21.47.15
242	10.21.47.16/28	10.21.47.17 – 10.21.47.30	10.21.47.31
243	10.21.47.32/28	10.21.47.33 – 10.21.47.46	10.21.47.47
244	10.21.47.48/28	10.21.47.49 – 10.21.47.62	10.21.47.63
245	10.21.47.64/28	10.21.47.65 – 10.21.47.78	10.21.47.79
246	10.21.47.80/28	10.21.47.81 – 10.21.47.94	10.21.47.95
247	10.21.47.96/28	10.21.47.97 – 10.21.47.110	10.21.47.111
248	10.21.47.112/28	10.21.47.113 – 10.21.47.126	10.21.47.127
249	10.21.47.128/28	10.21.47.129 – 10.21.47.142	10.21.47.143
250	10.21.47.144/28	10.21.47.145 – 10.21.47.158	10.21.47.159
251	10.21.47.160/28	10.21.47.161 – 10.21.47.174	10.21.47.175
252	10.21.47.176/28	10.21.47.177 – 10.21.47.190	10.21.47.191
253	10.21.47.192/28	10.21.47.193 – 10.21.47.206	10.21.47.207
254	10.21.47.208/28	10.21.47.209 – 10.21.47.222	10.21.47.223
255	10.21.47.224/28	10.21.47.225 – 10.21.47.238	10.21.47.239
256	10.21.47.240/28	10.21.47.241 – 10.21.47.254	10.21.47.255

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 →