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)10.43.64.0/18

network10.43.64.0/18

broadcast10.43.127.255

first host10.43.64.1

last host10.43.127.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.43.64.0/18

address00001010.00101011.01000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00101011.01000000.00000000

broadcast00001010.00101011.01111111.11111111

green = network part, grey = host part

hex0x0a2b4000

decimal170606592

reverse dns0.64.43.10.in-addr.arpa

ipv4-mapped::ffff:a2b:4000

/18 split into /28 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.43.64.0/28	10.43.64.1 – 10.43.64.14	10.43.64.15
2	10.43.64.16/28	10.43.64.17 – 10.43.64.30	10.43.64.31
3	10.43.64.32/28	10.43.64.33 – 10.43.64.46	10.43.64.47
4	10.43.64.48/28	10.43.64.49 – 10.43.64.62	10.43.64.63
5	10.43.64.64/28	10.43.64.65 – 10.43.64.78	10.43.64.79
6	10.43.64.80/28	10.43.64.81 – 10.43.64.94	10.43.64.95
7	10.43.64.96/28	10.43.64.97 – 10.43.64.110	10.43.64.111
8	10.43.64.112/28	10.43.64.113 – 10.43.64.126	10.43.64.127
9	10.43.64.128/28	10.43.64.129 – 10.43.64.142	10.43.64.143
10	10.43.64.144/28	10.43.64.145 – 10.43.64.158	10.43.64.159
11	10.43.64.160/28	10.43.64.161 – 10.43.64.174	10.43.64.175
12	10.43.64.176/28	10.43.64.177 – 10.43.64.190	10.43.64.191
13	10.43.64.192/28	10.43.64.193 – 10.43.64.206	10.43.64.207
14	10.43.64.208/28	10.43.64.209 – 10.43.64.222	10.43.64.223
15	10.43.64.224/28	10.43.64.225 – 10.43.64.238	10.43.64.239
16	10.43.64.240/28	10.43.64.241 – 10.43.64.254	10.43.64.255
17	10.43.65.0/28	10.43.65.1 – 10.43.65.14	10.43.65.15
18	10.43.65.16/28	10.43.65.17 – 10.43.65.30	10.43.65.31
19	10.43.65.32/28	10.43.65.33 – 10.43.65.46	10.43.65.47
20	10.43.65.48/28	10.43.65.49 – 10.43.65.62	10.43.65.63
21	10.43.65.64/28	10.43.65.65 – 10.43.65.78	10.43.65.79
22	10.43.65.80/28	10.43.65.81 – 10.43.65.94	10.43.65.95
23	10.43.65.96/28	10.43.65.97 – 10.43.65.110	10.43.65.111
24	10.43.65.112/28	10.43.65.113 – 10.43.65.126	10.43.65.127
25	10.43.65.128/28	10.43.65.129 – 10.43.65.142	10.43.65.143
26	10.43.65.144/28	10.43.65.145 – 10.43.65.158	10.43.65.159
27	10.43.65.160/28	10.43.65.161 – 10.43.65.174	10.43.65.175
28	10.43.65.176/28	10.43.65.177 – 10.43.65.190	10.43.65.191
29	10.43.65.192/28	10.43.65.193 – 10.43.65.206	10.43.65.207
30	10.43.65.208/28	10.43.65.209 – 10.43.65.222	10.43.65.223
31	10.43.65.224/28	10.43.65.225 – 10.43.65.238	10.43.65.239
32	10.43.65.240/28	10.43.65.241 – 10.43.65.254	10.43.65.255
33	10.43.66.0/28	10.43.66.1 – 10.43.66.14	10.43.66.15
34	10.43.66.16/28	10.43.66.17 – 10.43.66.30	10.43.66.31
35	10.43.66.32/28	10.43.66.33 – 10.43.66.46	10.43.66.47
36	10.43.66.48/28	10.43.66.49 – 10.43.66.62	10.43.66.63
37	10.43.66.64/28	10.43.66.65 – 10.43.66.78	10.43.66.79
38	10.43.66.80/28	10.43.66.81 – 10.43.66.94	10.43.66.95
39	10.43.66.96/28	10.43.66.97 – 10.43.66.110	10.43.66.111
40	10.43.66.112/28	10.43.66.113 – 10.43.66.126	10.43.66.127
41	10.43.66.128/28	10.43.66.129 – 10.43.66.142	10.43.66.143
42	10.43.66.144/28	10.43.66.145 – 10.43.66.158	10.43.66.159
43	10.43.66.160/28	10.43.66.161 – 10.43.66.174	10.43.66.175
44	10.43.66.176/28	10.43.66.177 – 10.43.66.190	10.43.66.191
45	10.43.66.192/28	10.43.66.193 – 10.43.66.206	10.43.66.207
46	10.43.66.208/28	10.43.66.209 – 10.43.66.222	10.43.66.223
47	10.43.66.224/28	10.43.66.225 – 10.43.66.238	10.43.66.239
48	10.43.66.240/28	10.43.66.241 – 10.43.66.254	10.43.66.255
49	10.43.67.0/28	10.43.67.1 – 10.43.67.14	10.43.67.15
50	10.43.67.16/28	10.43.67.17 – 10.43.67.30	10.43.67.31
51	10.43.67.32/28	10.43.67.33 – 10.43.67.46	10.43.67.47
52	10.43.67.48/28	10.43.67.49 – 10.43.67.62	10.43.67.63
53	10.43.67.64/28	10.43.67.65 – 10.43.67.78	10.43.67.79
54	10.43.67.80/28	10.43.67.81 – 10.43.67.94	10.43.67.95
55	10.43.67.96/28	10.43.67.97 – 10.43.67.110	10.43.67.111
56	10.43.67.112/28	10.43.67.113 – 10.43.67.126	10.43.67.127
57	10.43.67.128/28	10.43.67.129 – 10.43.67.142	10.43.67.143
58	10.43.67.144/28	10.43.67.145 – 10.43.67.158	10.43.67.159
59	10.43.67.160/28	10.43.67.161 – 10.43.67.174	10.43.67.175
60	10.43.67.176/28	10.43.67.177 – 10.43.67.190	10.43.67.191
61	10.43.67.192/28	10.43.67.193 – 10.43.67.206	10.43.67.207
62	10.43.67.208/28	10.43.67.209 – 10.43.67.222	10.43.67.223
63	10.43.67.224/28	10.43.67.225 – 10.43.67.238	10.43.67.239
64	10.43.67.240/28	10.43.67.241 – 10.43.67.254	10.43.67.255
65	10.43.68.0/28	10.43.68.1 – 10.43.68.14	10.43.68.15
66	10.43.68.16/28	10.43.68.17 – 10.43.68.30	10.43.68.31
67	10.43.68.32/28	10.43.68.33 – 10.43.68.46	10.43.68.47
68	10.43.68.48/28	10.43.68.49 – 10.43.68.62	10.43.68.63
69	10.43.68.64/28	10.43.68.65 – 10.43.68.78	10.43.68.79
70	10.43.68.80/28	10.43.68.81 – 10.43.68.94	10.43.68.95
71	10.43.68.96/28	10.43.68.97 – 10.43.68.110	10.43.68.111
72	10.43.68.112/28	10.43.68.113 – 10.43.68.126	10.43.68.127
73	10.43.68.128/28	10.43.68.129 – 10.43.68.142	10.43.68.143
74	10.43.68.144/28	10.43.68.145 – 10.43.68.158	10.43.68.159
75	10.43.68.160/28	10.43.68.161 – 10.43.68.174	10.43.68.175
76	10.43.68.176/28	10.43.68.177 – 10.43.68.190	10.43.68.191
77	10.43.68.192/28	10.43.68.193 – 10.43.68.206	10.43.68.207
78	10.43.68.208/28	10.43.68.209 – 10.43.68.222	10.43.68.223
79	10.43.68.224/28	10.43.68.225 – 10.43.68.238	10.43.68.239
80	10.43.68.240/28	10.43.68.241 – 10.43.68.254	10.43.68.255
81	10.43.69.0/28	10.43.69.1 – 10.43.69.14	10.43.69.15
82	10.43.69.16/28	10.43.69.17 – 10.43.69.30	10.43.69.31
83	10.43.69.32/28	10.43.69.33 – 10.43.69.46	10.43.69.47
84	10.43.69.48/28	10.43.69.49 – 10.43.69.62	10.43.69.63
85	10.43.69.64/28	10.43.69.65 – 10.43.69.78	10.43.69.79
86	10.43.69.80/28	10.43.69.81 – 10.43.69.94	10.43.69.95
87	10.43.69.96/28	10.43.69.97 – 10.43.69.110	10.43.69.111
88	10.43.69.112/28	10.43.69.113 – 10.43.69.126	10.43.69.127
89	10.43.69.128/28	10.43.69.129 – 10.43.69.142	10.43.69.143
90	10.43.69.144/28	10.43.69.145 – 10.43.69.158	10.43.69.159
91	10.43.69.160/28	10.43.69.161 – 10.43.69.174	10.43.69.175
92	10.43.69.176/28	10.43.69.177 – 10.43.69.190	10.43.69.191
93	10.43.69.192/28	10.43.69.193 – 10.43.69.206	10.43.69.207
94	10.43.69.208/28	10.43.69.209 – 10.43.69.222	10.43.69.223
95	10.43.69.224/28	10.43.69.225 – 10.43.69.238	10.43.69.239
96	10.43.69.240/28	10.43.69.241 – 10.43.69.254	10.43.69.255
97	10.43.70.0/28	10.43.70.1 – 10.43.70.14	10.43.70.15
98	10.43.70.16/28	10.43.70.17 – 10.43.70.30	10.43.70.31
99	10.43.70.32/28	10.43.70.33 – 10.43.70.46	10.43.70.47
100	10.43.70.48/28	10.43.70.49 – 10.43.70.62	10.43.70.63
101	10.43.70.64/28	10.43.70.65 – 10.43.70.78	10.43.70.79
102	10.43.70.80/28	10.43.70.81 – 10.43.70.94	10.43.70.95
103	10.43.70.96/28	10.43.70.97 – 10.43.70.110	10.43.70.111
104	10.43.70.112/28	10.43.70.113 – 10.43.70.126	10.43.70.127
105	10.43.70.128/28	10.43.70.129 – 10.43.70.142	10.43.70.143
106	10.43.70.144/28	10.43.70.145 – 10.43.70.158	10.43.70.159
107	10.43.70.160/28	10.43.70.161 – 10.43.70.174	10.43.70.175
108	10.43.70.176/28	10.43.70.177 – 10.43.70.190	10.43.70.191
109	10.43.70.192/28	10.43.70.193 – 10.43.70.206	10.43.70.207
110	10.43.70.208/28	10.43.70.209 – 10.43.70.222	10.43.70.223
111	10.43.70.224/28	10.43.70.225 – 10.43.70.238	10.43.70.239
112	10.43.70.240/28	10.43.70.241 – 10.43.70.254	10.43.70.255
113	10.43.71.0/28	10.43.71.1 – 10.43.71.14	10.43.71.15
114	10.43.71.16/28	10.43.71.17 – 10.43.71.30	10.43.71.31
115	10.43.71.32/28	10.43.71.33 – 10.43.71.46	10.43.71.47
116	10.43.71.48/28	10.43.71.49 – 10.43.71.62	10.43.71.63
117	10.43.71.64/28	10.43.71.65 – 10.43.71.78	10.43.71.79
118	10.43.71.80/28	10.43.71.81 – 10.43.71.94	10.43.71.95
119	10.43.71.96/28	10.43.71.97 – 10.43.71.110	10.43.71.111
120	10.43.71.112/28	10.43.71.113 – 10.43.71.126	10.43.71.127
121	10.43.71.128/28	10.43.71.129 – 10.43.71.142	10.43.71.143
122	10.43.71.144/28	10.43.71.145 – 10.43.71.158	10.43.71.159
123	10.43.71.160/28	10.43.71.161 – 10.43.71.174	10.43.71.175
124	10.43.71.176/28	10.43.71.177 – 10.43.71.190	10.43.71.191
125	10.43.71.192/28	10.43.71.193 – 10.43.71.206	10.43.71.207
126	10.43.71.208/28	10.43.71.209 – 10.43.71.222	10.43.71.223
127	10.43.71.224/28	10.43.71.225 – 10.43.71.238	10.43.71.239
128	10.43.71.240/28	10.43.71.241 – 10.43.71.254	10.43.71.255
129	10.43.72.0/28	10.43.72.1 – 10.43.72.14	10.43.72.15
130	10.43.72.16/28	10.43.72.17 – 10.43.72.30	10.43.72.31
131	10.43.72.32/28	10.43.72.33 – 10.43.72.46	10.43.72.47
132	10.43.72.48/28	10.43.72.49 – 10.43.72.62	10.43.72.63
133	10.43.72.64/28	10.43.72.65 – 10.43.72.78	10.43.72.79
134	10.43.72.80/28	10.43.72.81 – 10.43.72.94	10.43.72.95
135	10.43.72.96/28	10.43.72.97 – 10.43.72.110	10.43.72.111
136	10.43.72.112/28	10.43.72.113 – 10.43.72.126	10.43.72.127
137	10.43.72.128/28	10.43.72.129 – 10.43.72.142	10.43.72.143
138	10.43.72.144/28	10.43.72.145 – 10.43.72.158	10.43.72.159
139	10.43.72.160/28	10.43.72.161 – 10.43.72.174	10.43.72.175
140	10.43.72.176/28	10.43.72.177 – 10.43.72.190	10.43.72.191
141	10.43.72.192/28	10.43.72.193 – 10.43.72.206	10.43.72.207
142	10.43.72.208/28	10.43.72.209 – 10.43.72.222	10.43.72.223
143	10.43.72.224/28	10.43.72.225 – 10.43.72.238	10.43.72.239
144	10.43.72.240/28	10.43.72.241 – 10.43.72.254	10.43.72.255
145	10.43.73.0/28	10.43.73.1 – 10.43.73.14	10.43.73.15
146	10.43.73.16/28	10.43.73.17 – 10.43.73.30	10.43.73.31
147	10.43.73.32/28	10.43.73.33 – 10.43.73.46	10.43.73.47
148	10.43.73.48/28	10.43.73.49 – 10.43.73.62	10.43.73.63
149	10.43.73.64/28	10.43.73.65 – 10.43.73.78	10.43.73.79
150	10.43.73.80/28	10.43.73.81 – 10.43.73.94	10.43.73.95
151	10.43.73.96/28	10.43.73.97 – 10.43.73.110	10.43.73.111
152	10.43.73.112/28	10.43.73.113 – 10.43.73.126	10.43.73.127
153	10.43.73.128/28	10.43.73.129 – 10.43.73.142	10.43.73.143
154	10.43.73.144/28	10.43.73.145 – 10.43.73.158	10.43.73.159
155	10.43.73.160/28	10.43.73.161 – 10.43.73.174	10.43.73.175
156	10.43.73.176/28	10.43.73.177 – 10.43.73.190	10.43.73.191
157	10.43.73.192/28	10.43.73.193 – 10.43.73.206	10.43.73.207
158	10.43.73.208/28	10.43.73.209 – 10.43.73.222	10.43.73.223
159	10.43.73.224/28	10.43.73.225 – 10.43.73.238	10.43.73.239
160	10.43.73.240/28	10.43.73.241 – 10.43.73.254	10.43.73.255
161	10.43.74.0/28	10.43.74.1 – 10.43.74.14	10.43.74.15
162	10.43.74.16/28	10.43.74.17 – 10.43.74.30	10.43.74.31
163	10.43.74.32/28	10.43.74.33 – 10.43.74.46	10.43.74.47
164	10.43.74.48/28	10.43.74.49 – 10.43.74.62	10.43.74.63
165	10.43.74.64/28	10.43.74.65 – 10.43.74.78	10.43.74.79
166	10.43.74.80/28	10.43.74.81 – 10.43.74.94	10.43.74.95
167	10.43.74.96/28	10.43.74.97 – 10.43.74.110	10.43.74.111
168	10.43.74.112/28	10.43.74.113 – 10.43.74.126	10.43.74.127
169	10.43.74.128/28	10.43.74.129 – 10.43.74.142	10.43.74.143
170	10.43.74.144/28	10.43.74.145 – 10.43.74.158	10.43.74.159
171	10.43.74.160/28	10.43.74.161 – 10.43.74.174	10.43.74.175
172	10.43.74.176/28	10.43.74.177 – 10.43.74.190	10.43.74.191
173	10.43.74.192/28	10.43.74.193 – 10.43.74.206	10.43.74.207
174	10.43.74.208/28	10.43.74.209 – 10.43.74.222	10.43.74.223
175	10.43.74.224/28	10.43.74.225 – 10.43.74.238	10.43.74.239
176	10.43.74.240/28	10.43.74.241 – 10.43.74.254	10.43.74.255
177	10.43.75.0/28	10.43.75.1 – 10.43.75.14	10.43.75.15
178	10.43.75.16/28	10.43.75.17 – 10.43.75.30	10.43.75.31
179	10.43.75.32/28	10.43.75.33 – 10.43.75.46	10.43.75.47
180	10.43.75.48/28	10.43.75.49 – 10.43.75.62	10.43.75.63
181	10.43.75.64/28	10.43.75.65 – 10.43.75.78	10.43.75.79
182	10.43.75.80/28	10.43.75.81 – 10.43.75.94	10.43.75.95
183	10.43.75.96/28	10.43.75.97 – 10.43.75.110	10.43.75.111
184	10.43.75.112/28	10.43.75.113 – 10.43.75.126	10.43.75.127
185	10.43.75.128/28	10.43.75.129 – 10.43.75.142	10.43.75.143
186	10.43.75.144/28	10.43.75.145 – 10.43.75.158	10.43.75.159
187	10.43.75.160/28	10.43.75.161 – 10.43.75.174	10.43.75.175
188	10.43.75.176/28	10.43.75.177 – 10.43.75.190	10.43.75.191
189	10.43.75.192/28	10.43.75.193 – 10.43.75.206	10.43.75.207
190	10.43.75.208/28	10.43.75.209 – 10.43.75.222	10.43.75.223
191	10.43.75.224/28	10.43.75.225 – 10.43.75.238	10.43.75.239
192	10.43.75.240/28	10.43.75.241 – 10.43.75.254	10.43.75.255
193	10.43.76.0/28	10.43.76.1 – 10.43.76.14	10.43.76.15
194	10.43.76.16/28	10.43.76.17 – 10.43.76.30	10.43.76.31
195	10.43.76.32/28	10.43.76.33 – 10.43.76.46	10.43.76.47
196	10.43.76.48/28	10.43.76.49 – 10.43.76.62	10.43.76.63
197	10.43.76.64/28	10.43.76.65 – 10.43.76.78	10.43.76.79
198	10.43.76.80/28	10.43.76.81 – 10.43.76.94	10.43.76.95
199	10.43.76.96/28	10.43.76.97 – 10.43.76.110	10.43.76.111
200	10.43.76.112/28	10.43.76.113 – 10.43.76.126	10.43.76.127
201	10.43.76.128/28	10.43.76.129 – 10.43.76.142	10.43.76.143
202	10.43.76.144/28	10.43.76.145 – 10.43.76.158	10.43.76.159
203	10.43.76.160/28	10.43.76.161 – 10.43.76.174	10.43.76.175
204	10.43.76.176/28	10.43.76.177 – 10.43.76.190	10.43.76.191
205	10.43.76.192/28	10.43.76.193 – 10.43.76.206	10.43.76.207
206	10.43.76.208/28	10.43.76.209 – 10.43.76.222	10.43.76.223
207	10.43.76.224/28	10.43.76.225 – 10.43.76.238	10.43.76.239
208	10.43.76.240/28	10.43.76.241 – 10.43.76.254	10.43.76.255
209	10.43.77.0/28	10.43.77.1 – 10.43.77.14	10.43.77.15
210	10.43.77.16/28	10.43.77.17 – 10.43.77.30	10.43.77.31
211	10.43.77.32/28	10.43.77.33 – 10.43.77.46	10.43.77.47
212	10.43.77.48/28	10.43.77.49 – 10.43.77.62	10.43.77.63
213	10.43.77.64/28	10.43.77.65 – 10.43.77.78	10.43.77.79
214	10.43.77.80/28	10.43.77.81 – 10.43.77.94	10.43.77.95
215	10.43.77.96/28	10.43.77.97 – 10.43.77.110	10.43.77.111
216	10.43.77.112/28	10.43.77.113 – 10.43.77.126	10.43.77.127
217	10.43.77.128/28	10.43.77.129 – 10.43.77.142	10.43.77.143
218	10.43.77.144/28	10.43.77.145 – 10.43.77.158	10.43.77.159
219	10.43.77.160/28	10.43.77.161 – 10.43.77.174	10.43.77.175
220	10.43.77.176/28	10.43.77.177 – 10.43.77.190	10.43.77.191
221	10.43.77.192/28	10.43.77.193 – 10.43.77.206	10.43.77.207
222	10.43.77.208/28	10.43.77.209 – 10.43.77.222	10.43.77.223
223	10.43.77.224/28	10.43.77.225 – 10.43.77.238	10.43.77.239
224	10.43.77.240/28	10.43.77.241 – 10.43.77.254	10.43.77.255
225	10.43.78.0/28	10.43.78.1 – 10.43.78.14	10.43.78.15
226	10.43.78.16/28	10.43.78.17 – 10.43.78.30	10.43.78.31
227	10.43.78.32/28	10.43.78.33 – 10.43.78.46	10.43.78.47
228	10.43.78.48/28	10.43.78.49 – 10.43.78.62	10.43.78.63
229	10.43.78.64/28	10.43.78.65 – 10.43.78.78	10.43.78.79
230	10.43.78.80/28	10.43.78.81 – 10.43.78.94	10.43.78.95
231	10.43.78.96/28	10.43.78.97 – 10.43.78.110	10.43.78.111
232	10.43.78.112/28	10.43.78.113 – 10.43.78.126	10.43.78.127
233	10.43.78.128/28	10.43.78.129 – 10.43.78.142	10.43.78.143
234	10.43.78.144/28	10.43.78.145 – 10.43.78.158	10.43.78.159
235	10.43.78.160/28	10.43.78.161 – 10.43.78.174	10.43.78.175
236	10.43.78.176/28	10.43.78.177 – 10.43.78.190	10.43.78.191
237	10.43.78.192/28	10.43.78.193 – 10.43.78.206	10.43.78.207
238	10.43.78.208/28	10.43.78.209 – 10.43.78.222	10.43.78.223
239	10.43.78.224/28	10.43.78.225 – 10.43.78.238	10.43.78.239
240	10.43.78.240/28	10.43.78.241 – 10.43.78.254	10.43.78.255
241	10.43.79.0/28	10.43.79.1 – 10.43.79.14	10.43.79.15
242	10.43.79.16/28	10.43.79.17 – 10.43.79.30	10.43.79.31
243	10.43.79.32/28	10.43.79.33 – 10.43.79.46	10.43.79.47
244	10.43.79.48/28	10.43.79.49 – 10.43.79.62	10.43.79.63
245	10.43.79.64/28	10.43.79.65 – 10.43.79.78	10.43.79.79
246	10.43.79.80/28	10.43.79.81 – 10.43.79.94	10.43.79.95
247	10.43.79.96/28	10.43.79.97 – 10.43.79.110	10.43.79.111
248	10.43.79.112/28	10.43.79.113 – 10.43.79.126	10.43.79.127
249	10.43.79.128/28	10.43.79.129 – 10.43.79.142	10.43.79.143
250	10.43.79.144/28	10.43.79.145 – 10.43.79.158	10.43.79.159
251	10.43.79.160/28	10.43.79.161 – 10.43.79.174	10.43.79.175
252	10.43.79.176/28	10.43.79.177 – 10.43.79.190	10.43.79.191
253	10.43.79.192/28	10.43.79.193 – 10.43.79.206	10.43.79.207
254	10.43.79.208/28	10.43.79.209 – 10.43.79.222	10.43.79.223
255	10.43.79.224/28	10.43.79.225 – 10.43.79.238	10.43.79.239
256	10.43.79.240/28	10.43.79.241 – 10.43.79.254	10.43.79.255

showing 256 of 1,024

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 →