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 /29 · 2,048 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/29	10.3.192.1 – 10.3.192.6	10.3.192.7
2	10.3.192.8/29	10.3.192.9 – 10.3.192.14	10.3.192.15
3	10.3.192.16/29	10.3.192.17 – 10.3.192.22	10.3.192.23
4	10.3.192.24/29	10.3.192.25 – 10.3.192.30	10.3.192.31
5	10.3.192.32/29	10.3.192.33 – 10.3.192.38	10.3.192.39
6	10.3.192.40/29	10.3.192.41 – 10.3.192.46	10.3.192.47
7	10.3.192.48/29	10.3.192.49 – 10.3.192.54	10.3.192.55
8	10.3.192.56/29	10.3.192.57 – 10.3.192.62	10.3.192.63
9	10.3.192.64/29	10.3.192.65 – 10.3.192.70	10.3.192.71
10	10.3.192.72/29	10.3.192.73 – 10.3.192.78	10.3.192.79
11	10.3.192.80/29	10.3.192.81 – 10.3.192.86	10.3.192.87
12	10.3.192.88/29	10.3.192.89 – 10.3.192.94	10.3.192.95
13	10.3.192.96/29	10.3.192.97 – 10.3.192.102	10.3.192.103
14	10.3.192.104/29	10.3.192.105 – 10.3.192.110	10.3.192.111
15	10.3.192.112/29	10.3.192.113 – 10.3.192.118	10.3.192.119
16	10.3.192.120/29	10.3.192.121 – 10.3.192.126	10.3.192.127
17	10.3.192.128/29	10.3.192.129 – 10.3.192.134	10.3.192.135
18	10.3.192.136/29	10.3.192.137 – 10.3.192.142	10.3.192.143
19	10.3.192.144/29	10.3.192.145 – 10.3.192.150	10.3.192.151
20	10.3.192.152/29	10.3.192.153 – 10.3.192.158	10.3.192.159
21	10.3.192.160/29	10.3.192.161 – 10.3.192.166	10.3.192.167
22	10.3.192.168/29	10.3.192.169 – 10.3.192.174	10.3.192.175
23	10.3.192.176/29	10.3.192.177 – 10.3.192.182	10.3.192.183
24	10.3.192.184/29	10.3.192.185 – 10.3.192.190	10.3.192.191
25	10.3.192.192/29	10.3.192.193 – 10.3.192.198	10.3.192.199
26	10.3.192.200/29	10.3.192.201 – 10.3.192.206	10.3.192.207
27	10.3.192.208/29	10.3.192.209 – 10.3.192.214	10.3.192.215
28	10.3.192.216/29	10.3.192.217 – 10.3.192.222	10.3.192.223
29	10.3.192.224/29	10.3.192.225 – 10.3.192.230	10.3.192.231
30	10.3.192.232/29	10.3.192.233 – 10.3.192.238	10.3.192.239
31	10.3.192.240/29	10.3.192.241 – 10.3.192.246	10.3.192.247
32	10.3.192.248/29	10.3.192.249 – 10.3.192.254	10.3.192.255
33	10.3.193.0/29	10.3.193.1 – 10.3.193.6	10.3.193.7
34	10.3.193.8/29	10.3.193.9 – 10.3.193.14	10.3.193.15
35	10.3.193.16/29	10.3.193.17 – 10.3.193.22	10.3.193.23
36	10.3.193.24/29	10.3.193.25 – 10.3.193.30	10.3.193.31
37	10.3.193.32/29	10.3.193.33 – 10.3.193.38	10.3.193.39
38	10.3.193.40/29	10.3.193.41 – 10.3.193.46	10.3.193.47
39	10.3.193.48/29	10.3.193.49 – 10.3.193.54	10.3.193.55
40	10.3.193.56/29	10.3.193.57 – 10.3.193.62	10.3.193.63
41	10.3.193.64/29	10.3.193.65 – 10.3.193.70	10.3.193.71
42	10.3.193.72/29	10.3.193.73 – 10.3.193.78	10.3.193.79
43	10.3.193.80/29	10.3.193.81 – 10.3.193.86	10.3.193.87
44	10.3.193.88/29	10.3.193.89 – 10.3.193.94	10.3.193.95
45	10.3.193.96/29	10.3.193.97 – 10.3.193.102	10.3.193.103
46	10.3.193.104/29	10.3.193.105 – 10.3.193.110	10.3.193.111
47	10.3.193.112/29	10.3.193.113 – 10.3.193.118	10.3.193.119
48	10.3.193.120/29	10.3.193.121 – 10.3.193.126	10.3.193.127
49	10.3.193.128/29	10.3.193.129 – 10.3.193.134	10.3.193.135
50	10.3.193.136/29	10.3.193.137 – 10.3.193.142	10.3.193.143
51	10.3.193.144/29	10.3.193.145 – 10.3.193.150	10.3.193.151
52	10.3.193.152/29	10.3.193.153 – 10.3.193.158	10.3.193.159
53	10.3.193.160/29	10.3.193.161 – 10.3.193.166	10.3.193.167
54	10.3.193.168/29	10.3.193.169 – 10.3.193.174	10.3.193.175
55	10.3.193.176/29	10.3.193.177 – 10.3.193.182	10.3.193.183
56	10.3.193.184/29	10.3.193.185 – 10.3.193.190	10.3.193.191
57	10.3.193.192/29	10.3.193.193 – 10.3.193.198	10.3.193.199
58	10.3.193.200/29	10.3.193.201 – 10.3.193.206	10.3.193.207
59	10.3.193.208/29	10.3.193.209 – 10.3.193.214	10.3.193.215
60	10.3.193.216/29	10.3.193.217 – 10.3.193.222	10.3.193.223
61	10.3.193.224/29	10.3.193.225 – 10.3.193.230	10.3.193.231
62	10.3.193.232/29	10.3.193.233 – 10.3.193.238	10.3.193.239
63	10.3.193.240/29	10.3.193.241 – 10.3.193.246	10.3.193.247
64	10.3.193.248/29	10.3.193.249 – 10.3.193.254	10.3.193.255
65	10.3.194.0/29	10.3.194.1 – 10.3.194.6	10.3.194.7
66	10.3.194.8/29	10.3.194.9 – 10.3.194.14	10.3.194.15
67	10.3.194.16/29	10.3.194.17 – 10.3.194.22	10.3.194.23
68	10.3.194.24/29	10.3.194.25 – 10.3.194.30	10.3.194.31
69	10.3.194.32/29	10.3.194.33 – 10.3.194.38	10.3.194.39
70	10.3.194.40/29	10.3.194.41 – 10.3.194.46	10.3.194.47
71	10.3.194.48/29	10.3.194.49 – 10.3.194.54	10.3.194.55
72	10.3.194.56/29	10.3.194.57 – 10.3.194.62	10.3.194.63
73	10.3.194.64/29	10.3.194.65 – 10.3.194.70	10.3.194.71
74	10.3.194.72/29	10.3.194.73 – 10.3.194.78	10.3.194.79
75	10.3.194.80/29	10.3.194.81 – 10.3.194.86	10.3.194.87
76	10.3.194.88/29	10.3.194.89 – 10.3.194.94	10.3.194.95
77	10.3.194.96/29	10.3.194.97 – 10.3.194.102	10.3.194.103
78	10.3.194.104/29	10.3.194.105 – 10.3.194.110	10.3.194.111
79	10.3.194.112/29	10.3.194.113 – 10.3.194.118	10.3.194.119
80	10.3.194.120/29	10.3.194.121 – 10.3.194.126	10.3.194.127
81	10.3.194.128/29	10.3.194.129 – 10.3.194.134	10.3.194.135
82	10.3.194.136/29	10.3.194.137 – 10.3.194.142	10.3.194.143
83	10.3.194.144/29	10.3.194.145 – 10.3.194.150	10.3.194.151
84	10.3.194.152/29	10.3.194.153 – 10.3.194.158	10.3.194.159
85	10.3.194.160/29	10.3.194.161 – 10.3.194.166	10.3.194.167
86	10.3.194.168/29	10.3.194.169 – 10.3.194.174	10.3.194.175
87	10.3.194.176/29	10.3.194.177 – 10.3.194.182	10.3.194.183
88	10.3.194.184/29	10.3.194.185 – 10.3.194.190	10.3.194.191
89	10.3.194.192/29	10.3.194.193 – 10.3.194.198	10.3.194.199
90	10.3.194.200/29	10.3.194.201 – 10.3.194.206	10.3.194.207
91	10.3.194.208/29	10.3.194.209 – 10.3.194.214	10.3.194.215
92	10.3.194.216/29	10.3.194.217 – 10.3.194.222	10.3.194.223
93	10.3.194.224/29	10.3.194.225 – 10.3.194.230	10.3.194.231
94	10.3.194.232/29	10.3.194.233 – 10.3.194.238	10.3.194.239
95	10.3.194.240/29	10.3.194.241 – 10.3.194.246	10.3.194.247
96	10.3.194.248/29	10.3.194.249 – 10.3.194.254	10.3.194.255
97	10.3.195.0/29	10.3.195.1 – 10.3.195.6	10.3.195.7
98	10.3.195.8/29	10.3.195.9 – 10.3.195.14	10.3.195.15
99	10.3.195.16/29	10.3.195.17 – 10.3.195.22	10.3.195.23
100	10.3.195.24/29	10.3.195.25 – 10.3.195.30	10.3.195.31
101	10.3.195.32/29	10.3.195.33 – 10.3.195.38	10.3.195.39
102	10.3.195.40/29	10.3.195.41 – 10.3.195.46	10.3.195.47
103	10.3.195.48/29	10.3.195.49 – 10.3.195.54	10.3.195.55
104	10.3.195.56/29	10.3.195.57 – 10.3.195.62	10.3.195.63
105	10.3.195.64/29	10.3.195.65 – 10.3.195.70	10.3.195.71
106	10.3.195.72/29	10.3.195.73 – 10.3.195.78	10.3.195.79
107	10.3.195.80/29	10.3.195.81 – 10.3.195.86	10.3.195.87
108	10.3.195.88/29	10.3.195.89 – 10.3.195.94	10.3.195.95
109	10.3.195.96/29	10.3.195.97 – 10.3.195.102	10.3.195.103
110	10.3.195.104/29	10.3.195.105 – 10.3.195.110	10.3.195.111
111	10.3.195.112/29	10.3.195.113 – 10.3.195.118	10.3.195.119
112	10.3.195.120/29	10.3.195.121 – 10.3.195.126	10.3.195.127
113	10.3.195.128/29	10.3.195.129 – 10.3.195.134	10.3.195.135
114	10.3.195.136/29	10.3.195.137 – 10.3.195.142	10.3.195.143
115	10.3.195.144/29	10.3.195.145 – 10.3.195.150	10.3.195.151
116	10.3.195.152/29	10.3.195.153 – 10.3.195.158	10.3.195.159
117	10.3.195.160/29	10.3.195.161 – 10.3.195.166	10.3.195.167
118	10.3.195.168/29	10.3.195.169 – 10.3.195.174	10.3.195.175
119	10.3.195.176/29	10.3.195.177 – 10.3.195.182	10.3.195.183
120	10.3.195.184/29	10.3.195.185 – 10.3.195.190	10.3.195.191
121	10.3.195.192/29	10.3.195.193 – 10.3.195.198	10.3.195.199
122	10.3.195.200/29	10.3.195.201 – 10.3.195.206	10.3.195.207
123	10.3.195.208/29	10.3.195.209 – 10.3.195.214	10.3.195.215
124	10.3.195.216/29	10.3.195.217 – 10.3.195.222	10.3.195.223
125	10.3.195.224/29	10.3.195.225 – 10.3.195.230	10.3.195.231
126	10.3.195.232/29	10.3.195.233 – 10.3.195.238	10.3.195.239
127	10.3.195.240/29	10.3.195.241 – 10.3.195.246	10.3.195.247
128	10.3.195.248/29	10.3.195.249 – 10.3.195.254	10.3.195.255
129	10.3.196.0/29	10.3.196.1 – 10.3.196.6	10.3.196.7
130	10.3.196.8/29	10.3.196.9 – 10.3.196.14	10.3.196.15
131	10.3.196.16/29	10.3.196.17 – 10.3.196.22	10.3.196.23
132	10.3.196.24/29	10.3.196.25 – 10.3.196.30	10.3.196.31
133	10.3.196.32/29	10.3.196.33 – 10.3.196.38	10.3.196.39
134	10.3.196.40/29	10.3.196.41 – 10.3.196.46	10.3.196.47
135	10.3.196.48/29	10.3.196.49 – 10.3.196.54	10.3.196.55
136	10.3.196.56/29	10.3.196.57 – 10.3.196.62	10.3.196.63
137	10.3.196.64/29	10.3.196.65 – 10.3.196.70	10.3.196.71
138	10.3.196.72/29	10.3.196.73 – 10.3.196.78	10.3.196.79
139	10.3.196.80/29	10.3.196.81 – 10.3.196.86	10.3.196.87
140	10.3.196.88/29	10.3.196.89 – 10.3.196.94	10.3.196.95
141	10.3.196.96/29	10.3.196.97 – 10.3.196.102	10.3.196.103
142	10.3.196.104/29	10.3.196.105 – 10.3.196.110	10.3.196.111
143	10.3.196.112/29	10.3.196.113 – 10.3.196.118	10.3.196.119
144	10.3.196.120/29	10.3.196.121 – 10.3.196.126	10.3.196.127
145	10.3.196.128/29	10.3.196.129 – 10.3.196.134	10.3.196.135
146	10.3.196.136/29	10.3.196.137 – 10.3.196.142	10.3.196.143
147	10.3.196.144/29	10.3.196.145 – 10.3.196.150	10.3.196.151
148	10.3.196.152/29	10.3.196.153 – 10.3.196.158	10.3.196.159
149	10.3.196.160/29	10.3.196.161 – 10.3.196.166	10.3.196.167
150	10.3.196.168/29	10.3.196.169 – 10.3.196.174	10.3.196.175
151	10.3.196.176/29	10.3.196.177 – 10.3.196.182	10.3.196.183
152	10.3.196.184/29	10.3.196.185 – 10.3.196.190	10.3.196.191
153	10.3.196.192/29	10.3.196.193 – 10.3.196.198	10.3.196.199
154	10.3.196.200/29	10.3.196.201 – 10.3.196.206	10.3.196.207
155	10.3.196.208/29	10.3.196.209 – 10.3.196.214	10.3.196.215
156	10.3.196.216/29	10.3.196.217 – 10.3.196.222	10.3.196.223
157	10.3.196.224/29	10.3.196.225 – 10.3.196.230	10.3.196.231
158	10.3.196.232/29	10.3.196.233 – 10.3.196.238	10.3.196.239
159	10.3.196.240/29	10.3.196.241 – 10.3.196.246	10.3.196.247
160	10.3.196.248/29	10.3.196.249 – 10.3.196.254	10.3.196.255
161	10.3.197.0/29	10.3.197.1 – 10.3.197.6	10.3.197.7
162	10.3.197.8/29	10.3.197.9 – 10.3.197.14	10.3.197.15
163	10.3.197.16/29	10.3.197.17 – 10.3.197.22	10.3.197.23
164	10.3.197.24/29	10.3.197.25 – 10.3.197.30	10.3.197.31
165	10.3.197.32/29	10.3.197.33 – 10.3.197.38	10.3.197.39
166	10.3.197.40/29	10.3.197.41 – 10.3.197.46	10.3.197.47
167	10.3.197.48/29	10.3.197.49 – 10.3.197.54	10.3.197.55
168	10.3.197.56/29	10.3.197.57 – 10.3.197.62	10.3.197.63
169	10.3.197.64/29	10.3.197.65 – 10.3.197.70	10.3.197.71
170	10.3.197.72/29	10.3.197.73 – 10.3.197.78	10.3.197.79
171	10.3.197.80/29	10.3.197.81 – 10.3.197.86	10.3.197.87
172	10.3.197.88/29	10.3.197.89 – 10.3.197.94	10.3.197.95
173	10.3.197.96/29	10.3.197.97 – 10.3.197.102	10.3.197.103
174	10.3.197.104/29	10.3.197.105 – 10.3.197.110	10.3.197.111
175	10.3.197.112/29	10.3.197.113 – 10.3.197.118	10.3.197.119
176	10.3.197.120/29	10.3.197.121 – 10.3.197.126	10.3.197.127
177	10.3.197.128/29	10.3.197.129 – 10.3.197.134	10.3.197.135
178	10.3.197.136/29	10.3.197.137 – 10.3.197.142	10.3.197.143
179	10.3.197.144/29	10.3.197.145 – 10.3.197.150	10.3.197.151
180	10.3.197.152/29	10.3.197.153 – 10.3.197.158	10.3.197.159
181	10.3.197.160/29	10.3.197.161 – 10.3.197.166	10.3.197.167
182	10.3.197.168/29	10.3.197.169 – 10.3.197.174	10.3.197.175
183	10.3.197.176/29	10.3.197.177 – 10.3.197.182	10.3.197.183
184	10.3.197.184/29	10.3.197.185 – 10.3.197.190	10.3.197.191
185	10.3.197.192/29	10.3.197.193 – 10.3.197.198	10.3.197.199
186	10.3.197.200/29	10.3.197.201 – 10.3.197.206	10.3.197.207
187	10.3.197.208/29	10.3.197.209 – 10.3.197.214	10.3.197.215
188	10.3.197.216/29	10.3.197.217 – 10.3.197.222	10.3.197.223
189	10.3.197.224/29	10.3.197.225 – 10.3.197.230	10.3.197.231
190	10.3.197.232/29	10.3.197.233 – 10.3.197.238	10.3.197.239
191	10.3.197.240/29	10.3.197.241 – 10.3.197.246	10.3.197.247
192	10.3.197.248/29	10.3.197.249 – 10.3.197.254	10.3.197.255
193	10.3.198.0/29	10.3.198.1 – 10.3.198.6	10.3.198.7
194	10.3.198.8/29	10.3.198.9 – 10.3.198.14	10.3.198.15
195	10.3.198.16/29	10.3.198.17 – 10.3.198.22	10.3.198.23
196	10.3.198.24/29	10.3.198.25 – 10.3.198.30	10.3.198.31
197	10.3.198.32/29	10.3.198.33 – 10.3.198.38	10.3.198.39
198	10.3.198.40/29	10.3.198.41 – 10.3.198.46	10.3.198.47
199	10.3.198.48/29	10.3.198.49 – 10.3.198.54	10.3.198.55
200	10.3.198.56/29	10.3.198.57 – 10.3.198.62	10.3.198.63
201	10.3.198.64/29	10.3.198.65 – 10.3.198.70	10.3.198.71
202	10.3.198.72/29	10.3.198.73 – 10.3.198.78	10.3.198.79
203	10.3.198.80/29	10.3.198.81 – 10.3.198.86	10.3.198.87
204	10.3.198.88/29	10.3.198.89 – 10.3.198.94	10.3.198.95
205	10.3.198.96/29	10.3.198.97 – 10.3.198.102	10.3.198.103
206	10.3.198.104/29	10.3.198.105 – 10.3.198.110	10.3.198.111
207	10.3.198.112/29	10.3.198.113 – 10.3.198.118	10.3.198.119
208	10.3.198.120/29	10.3.198.121 – 10.3.198.126	10.3.198.127
209	10.3.198.128/29	10.3.198.129 – 10.3.198.134	10.3.198.135
210	10.3.198.136/29	10.3.198.137 – 10.3.198.142	10.3.198.143
211	10.3.198.144/29	10.3.198.145 – 10.3.198.150	10.3.198.151
212	10.3.198.152/29	10.3.198.153 – 10.3.198.158	10.3.198.159
213	10.3.198.160/29	10.3.198.161 – 10.3.198.166	10.3.198.167
214	10.3.198.168/29	10.3.198.169 – 10.3.198.174	10.3.198.175
215	10.3.198.176/29	10.3.198.177 – 10.3.198.182	10.3.198.183
216	10.3.198.184/29	10.3.198.185 – 10.3.198.190	10.3.198.191
217	10.3.198.192/29	10.3.198.193 – 10.3.198.198	10.3.198.199
218	10.3.198.200/29	10.3.198.201 – 10.3.198.206	10.3.198.207
219	10.3.198.208/29	10.3.198.209 – 10.3.198.214	10.3.198.215
220	10.3.198.216/29	10.3.198.217 – 10.3.198.222	10.3.198.223
221	10.3.198.224/29	10.3.198.225 – 10.3.198.230	10.3.198.231
222	10.3.198.232/29	10.3.198.233 – 10.3.198.238	10.3.198.239
223	10.3.198.240/29	10.3.198.241 – 10.3.198.246	10.3.198.247
224	10.3.198.248/29	10.3.198.249 – 10.3.198.254	10.3.198.255
225	10.3.199.0/29	10.3.199.1 – 10.3.199.6	10.3.199.7
226	10.3.199.8/29	10.3.199.9 – 10.3.199.14	10.3.199.15
227	10.3.199.16/29	10.3.199.17 – 10.3.199.22	10.3.199.23
228	10.3.199.24/29	10.3.199.25 – 10.3.199.30	10.3.199.31
229	10.3.199.32/29	10.3.199.33 – 10.3.199.38	10.3.199.39
230	10.3.199.40/29	10.3.199.41 – 10.3.199.46	10.3.199.47
231	10.3.199.48/29	10.3.199.49 – 10.3.199.54	10.3.199.55
232	10.3.199.56/29	10.3.199.57 – 10.3.199.62	10.3.199.63
233	10.3.199.64/29	10.3.199.65 – 10.3.199.70	10.3.199.71
234	10.3.199.72/29	10.3.199.73 – 10.3.199.78	10.3.199.79
235	10.3.199.80/29	10.3.199.81 – 10.3.199.86	10.3.199.87
236	10.3.199.88/29	10.3.199.89 – 10.3.199.94	10.3.199.95
237	10.3.199.96/29	10.3.199.97 – 10.3.199.102	10.3.199.103
238	10.3.199.104/29	10.3.199.105 – 10.3.199.110	10.3.199.111
239	10.3.199.112/29	10.3.199.113 – 10.3.199.118	10.3.199.119
240	10.3.199.120/29	10.3.199.121 – 10.3.199.126	10.3.199.127
241	10.3.199.128/29	10.3.199.129 – 10.3.199.134	10.3.199.135
242	10.3.199.136/29	10.3.199.137 – 10.3.199.142	10.3.199.143
243	10.3.199.144/29	10.3.199.145 – 10.3.199.150	10.3.199.151
244	10.3.199.152/29	10.3.199.153 – 10.3.199.158	10.3.199.159
245	10.3.199.160/29	10.3.199.161 – 10.3.199.166	10.3.199.167
246	10.3.199.168/29	10.3.199.169 – 10.3.199.174	10.3.199.175
247	10.3.199.176/29	10.3.199.177 – 10.3.199.182	10.3.199.183
248	10.3.199.184/29	10.3.199.185 – 10.3.199.190	10.3.199.191
249	10.3.199.192/29	10.3.199.193 – 10.3.199.198	10.3.199.199
250	10.3.199.200/29	10.3.199.201 – 10.3.199.206	10.3.199.207
251	10.3.199.208/29	10.3.199.209 – 10.3.199.214	10.3.199.215
252	10.3.199.216/29	10.3.199.217 – 10.3.199.222	10.3.199.223
253	10.3.199.224/29	10.3.199.225 – 10.3.199.230	10.3.199.231
254	10.3.199.232/29	10.3.199.233 – 10.3.199.238	10.3.199.239
255	10.3.199.240/29	10.3.199.241 – 10.3.199.246	10.3.199.247
256	10.3.199.248/29	10.3.199.249 – 10.3.199.254	10.3.199.255

showing 256 of 2,048

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 →