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)172.16.5.4/20

network172.16.0.0/20

broadcast172.16.15.255

first host172.16.0.1

last host172.16.15.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classB

ipcalc 172.16.5.4/20

address10101100.00010000.00000101.00000100

subnet mask11111111.11111111.11110000.00000000

network10101100.00010000.00000000.00000000

broadcast10101100.00010000.00001111.11111111

green = network part, grey = host part

hex0xac100504

decimal2886731012

reverse dns4.5.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:504

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	172.16.0.0/29	172.16.0.1 – 172.16.0.6	172.16.0.7
2	172.16.0.8/29	172.16.0.9 – 172.16.0.14	172.16.0.15
3	172.16.0.16/29	172.16.0.17 – 172.16.0.22	172.16.0.23
4	172.16.0.24/29	172.16.0.25 – 172.16.0.30	172.16.0.31
5	172.16.0.32/29	172.16.0.33 – 172.16.0.38	172.16.0.39
6	172.16.0.40/29	172.16.0.41 – 172.16.0.46	172.16.0.47
7	172.16.0.48/29	172.16.0.49 – 172.16.0.54	172.16.0.55
8	172.16.0.56/29	172.16.0.57 – 172.16.0.62	172.16.0.63
9	172.16.0.64/29	172.16.0.65 – 172.16.0.70	172.16.0.71
10	172.16.0.72/29	172.16.0.73 – 172.16.0.78	172.16.0.79
11	172.16.0.80/29	172.16.0.81 – 172.16.0.86	172.16.0.87
12	172.16.0.88/29	172.16.0.89 – 172.16.0.94	172.16.0.95
13	172.16.0.96/29	172.16.0.97 – 172.16.0.102	172.16.0.103
14	172.16.0.104/29	172.16.0.105 – 172.16.0.110	172.16.0.111
15	172.16.0.112/29	172.16.0.113 – 172.16.0.118	172.16.0.119
16	172.16.0.120/29	172.16.0.121 – 172.16.0.126	172.16.0.127
17	172.16.0.128/29	172.16.0.129 – 172.16.0.134	172.16.0.135
18	172.16.0.136/29	172.16.0.137 – 172.16.0.142	172.16.0.143
19	172.16.0.144/29	172.16.0.145 – 172.16.0.150	172.16.0.151
20	172.16.0.152/29	172.16.0.153 – 172.16.0.158	172.16.0.159
21	172.16.0.160/29	172.16.0.161 – 172.16.0.166	172.16.0.167
22	172.16.0.168/29	172.16.0.169 – 172.16.0.174	172.16.0.175
23	172.16.0.176/29	172.16.0.177 – 172.16.0.182	172.16.0.183
24	172.16.0.184/29	172.16.0.185 – 172.16.0.190	172.16.0.191
25	172.16.0.192/29	172.16.0.193 – 172.16.0.198	172.16.0.199
26	172.16.0.200/29	172.16.0.201 – 172.16.0.206	172.16.0.207
27	172.16.0.208/29	172.16.0.209 – 172.16.0.214	172.16.0.215
28	172.16.0.216/29	172.16.0.217 – 172.16.0.222	172.16.0.223
29	172.16.0.224/29	172.16.0.225 – 172.16.0.230	172.16.0.231
30	172.16.0.232/29	172.16.0.233 – 172.16.0.238	172.16.0.239
31	172.16.0.240/29	172.16.0.241 – 172.16.0.246	172.16.0.247
32	172.16.0.248/29	172.16.0.249 – 172.16.0.254	172.16.0.255
33	172.16.1.0/29	172.16.1.1 – 172.16.1.6	172.16.1.7
34	172.16.1.8/29	172.16.1.9 – 172.16.1.14	172.16.1.15
35	172.16.1.16/29	172.16.1.17 – 172.16.1.22	172.16.1.23
36	172.16.1.24/29	172.16.1.25 – 172.16.1.30	172.16.1.31
37	172.16.1.32/29	172.16.1.33 – 172.16.1.38	172.16.1.39
38	172.16.1.40/29	172.16.1.41 – 172.16.1.46	172.16.1.47
39	172.16.1.48/29	172.16.1.49 – 172.16.1.54	172.16.1.55
40	172.16.1.56/29	172.16.1.57 – 172.16.1.62	172.16.1.63
41	172.16.1.64/29	172.16.1.65 – 172.16.1.70	172.16.1.71
42	172.16.1.72/29	172.16.1.73 – 172.16.1.78	172.16.1.79
43	172.16.1.80/29	172.16.1.81 – 172.16.1.86	172.16.1.87
44	172.16.1.88/29	172.16.1.89 – 172.16.1.94	172.16.1.95
45	172.16.1.96/29	172.16.1.97 – 172.16.1.102	172.16.1.103
46	172.16.1.104/29	172.16.1.105 – 172.16.1.110	172.16.1.111
47	172.16.1.112/29	172.16.1.113 – 172.16.1.118	172.16.1.119
48	172.16.1.120/29	172.16.1.121 – 172.16.1.126	172.16.1.127
49	172.16.1.128/29	172.16.1.129 – 172.16.1.134	172.16.1.135
50	172.16.1.136/29	172.16.1.137 – 172.16.1.142	172.16.1.143
51	172.16.1.144/29	172.16.1.145 – 172.16.1.150	172.16.1.151
52	172.16.1.152/29	172.16.1.153 – 172.16.1.158	172.16.1.159
53	172.16.1.160/29	172.16.1.161 – 172.16.1.166	172.16.1.167
54	172.16.1.168/29	172.16.1.169 – 172.16.1.174	172.16.1.175
55	172.16.1.176/29	172.16.1.177 – 172.16.1.182	172.16.1.183
56	172.16.1.184/29	172.16.1.185 – 172.16.1.190	172.16.1.191
57	172.16.1.192/29	172.16.1.193 – 172.16.1.198	172.16.1.199
58	172.16.1.200/29	172.16.1.201 – 172.16.1.206	172.16.1.207
59	172.16.1.208/29	172.16.1.209 – 172.16.1.214	172.16.1.215
60	172.16.1.216/29	172.16.1.217 – 172.16.1.222	172.16.1.223
61	172.16.1.224/29	172.16.1.225 – 172.16.1.230	172.16.1.231
62	172.16.1.232/29	172.16.1.233 – 172.16.1.238	172.16.1.239
63	172.16.1.240/29	172.16.1.241 – 172.16.1.246	172.16.1.247
64	172.16.1.248/29	172.16.1.249 – 172.16.1.254	172.16.1.255
65	172.16.2.0/29	172.16.2.1 – 172.16.2.6	172.16.2.7
66	172.16.2.8/29	172.16.2.9 – 172.16.2.14	172.16.2.15
67	172.16.2.16/29	172.16.2.17 – 172.16.2.22	172.16.2.23
68	172.16.2.24/29	172.16.2.25 – 172.16.2.30	172.16.2.31
69	172.16.2.32/29	172.16.2.33 – 172.16.2.38	172.16.2.39
70	172.16.2.40/29	172.16.2.41 – 172.16.2.46	172.16.2.47
71	172.16.2.48/29	172.16.2.49 – 172.16.2.54	172.16.2.55
72	172.16.2.56/29	172.16.2.57 – 172.16.2.62	172.16.2.63
73	172.16.2.64/29	172.16.2.65 – 172.16.2.70	172.16.2.71
74	172.16.2.72/29	172.16.2.73 – 172.16.2.78	172.16.2.79
75	172.16.2.80/29	172.16.2.81 – 172.16.2.86	172.16.2.87
76	172.16.2.88/29	172.16.2.89 – 172.16.2.94	172.16.2.95
77	172.16.2.96/29	172.16.2.97 – 172.16.2.102	172.16.2.103
78	172.16.2.104/29	172.16.2.105 – 172.16.2.110	172.16.2.111
79	172.16.2.112/29	172.16.2.113 – 172.16.2.118	172.16.2.119
80	172.16.2.120/29	172.16.2.121 – 172.16.2.126	172.16.2.127
81	172.16.2.128/29	172.16.2.129 – 172.16.2.134	172.16.2.135
82	172.16.2.136/29	172.16.2.137 – 172.16.2.142	172.16.2.143
83	172.16.2.144/29	172.16.2.145 – 172.16.2.150	172.16.2.151
84	172.16.2.152/29	172.16.2.153 – 172.16.2.158	172.16.2.159
85	172.16.2.160/29	172.16.2.161 – 172.16.2.166	172.16.2.167
86	172.16.2.168/29	172.16.2.169 – 172.16.2.174	172.16.2.175
87	172.16.2.176/29	172.16.2.177 – 172.16.2.182	172.16.2.183
88	172.16.2.184/29	172.16.2.185 – 172.16.2.190	172.16.2.191
89	172.16.2.192/29	172.16.2.193 – 172.16.2.198	172.16.2.199
90	172.16.2.200/29	172.16.2.201 – 172.16.2.206	172.16.2.207
91	172.16.2.208/29	172.16.2.209 – 172.16.2.214	172.16.2.215
92	172.16.2.216/29	172.16.2.217 – 172.16.2.222	172.16.2.223
93	172.16.2.224/29	172.16.2.225 – 172.16.2.230	172.16.2.231
94	172.16.2.232/29	172.16.2.233 – 172.16.2.238	172.16.2.239
95	172.16.2.240/29	172.16.2.241 – 172.16.2.246	172.16.2.247
96	172.16.2.248/29	172.16.2.249 – 172.16.2.254	172.16.2.255
97	172.16.3.0/29	172.16.3.1 – 172.16.3.6	172.16.3.7
98	172.16.3.8/29	172.16.3.9 – 172.16.3.14	172.16.3.15
99	172.16.3.16/29	172.16.3.17 – 172.16.3.22	172.16.3.23
100	172.16.3.24/29	172.16.3.25 – 172.16.3.30	172.16.3.31
101	172.16.3.32/29	172.16.3.33 – 172.16.3.38	172.16.3.39
102	172.16.3.40/29	172.16.3.41 – 172.16.3.46	172.16.3.47
103	172.16.3.48/29	172.16.3.49 – 172.16.3.54	172.16.3.55
104	172.16.3.56/29	172.16.3.57 – 172.16.3.62	172.16.3.63
105	172.16.3.64/29	172.16.3.65 – 172.16.3.70	172.16.3.71
106	172.16.3.72/29	172.16.3.73 – 172.16.3.78	172.16.3.79
107	172.16.3.80/29	172.16.3.81 – 172.16.3.86	172.16.3.87
108	172.16.3.88/29	172.16.3.89 – 172.16.3.94	172.16.3.95
109	172.16.3.96/29	172.16.3.97 – 172.16.3.102	172.16.3.103
110	172.16.3.104/29	172.16.3.105 – 172.16.3.110	172.16.3.111
111	172.16.3.112/29	172.16.3.113 – 172.16.3.118	172.16.3.119
112	172.16.3.120/29	172.16.3.121 – 172.16.3.126	172.16.3.127
113	172.16.3.128/29	172.16.3.129 – 172.16.3.134	172.16.3.135
114	172.16.3.136/29	172.16.3.137 – 172.16.3.142	172.16.3.143
115	172.16.3.144/29	172.16.3.145 – 172.16.3.150	172.16.3.151
116	172.16.3.152/29	172.16.3.153 – 172.16.3.158	172.16.3.159
117	172.16.3.160/29	172.16.3.161 – 172.16.3.166	172.16.3.167
118	172.16.3.168/29	172.16.3.169 – 172.16.3.174	172.16.3.175
119	172.16.3.176/29	172.16.3.177 – 172.16.3.182	172.16.3.183
120	172.16.3.184/29	172.16.3.185 – 172.16.3.190	172.16.3.191
121	172.16.3.192/29	172.16.3.193 – 172.16.3.198	172.16.3.199
122	172.16.3.200/29	172.16.3.201 – 172.16.3.206	172.16.3.207
123	172.16.3.208/29	172.16.3.209 – 172.16.3.214	172.16.3.215
124	172.16.3.216/29	172.16.3.217 – 172.16.3.222	172.16.3.223
125	172.16.3.224/29	172.16.3.225 – 172.16.3.230	172.16.3.231
126	172.16.3.232/29	172.16.3.233 – 172.16.3.238	172.16.3.239
127	172.16.3.240/29	172.16.3.241 – 172.16.3.246	172.16.3.247
128	172.16.3.248/29	172.16.3.249 – 172.16.3.254	172.16.3.255
129	172.16.4.0/29	172.16.4.1 – 172.16.4.6	172.16.4.7
130	172.16.4.8/29	172.16.4.9 – 172.16.4.14	172.16.4.15
131	172.16.4.16/29	172.16.4.17 – 172.16.4.22	172.16.4.23
132	172.16.4.24/29	172.16.4.25 – 172.16.4.30	172.16.4.31
133	172.16.4.32/29	172.16.4.33 – 172.16.4.38	172.16.4.39
134	172.16.4.40/29	172.16.4.41 – 172.16.4.46	172.16.4.47
135	172.16.4.48/29	172.16.4.49 – 172.16.4.54	172.16.4.55
136	172.16.4.56/29	172.16.4.57 – 172.16.4.62	172.16.4.63
137	172.16.4.64/29	172.16.4.65 – 172.16.4.70	172.16.4.71
138	172.16.4.72/29	172.16.4.73 – 172.16.4.78	172.16.4.79
139	172.16.4.80/29	172.16.4.81 – 172.16.4.86	172.16.4.87
140	172.16.4.88/29	172.16.4.89 – 172.16.4.94	172.16.4.95
141	172.16.4.96/29	172.16.4.97 – 172.16.4.102	172.16.4.103
142	172.16.4.104/29	172.16.4.105 – 172.16.4.110	172.16.4.111
143	172.16.4.112/29	172.16.4.113 – 172.16.4.118	172.16.4.119
144	172.16.4.120/29	172.16.4.121 – 172.16.4.126	172.16.4.127
145	172.16.4.128/29	172.16.4.129 – 172.16.4.134	172.16.4.135
146	172.16.4.136/29	172.16.4.137 – 172.16.4.142	172.16.4.143
147	172.16.4.144/29	172.16.4.145 – 172.16.4.150	172.16.4.151
148	172.16.4.152/29	172.16.4.153 – 172.16.4.158	172.16.4.159
149	172.16.4.160/29	172.16.4.161 – 172.16.4.166	172.16.4.167
150	172.16.4.168/29	172.16.4.169 – 172.16.4.174	172.16.4.175
151	172.16.4.176/29	172.16.4.177 – 172.16.4.182	172.16.4.183
152	172.16.4.184/29	172.16.4.185 – 172.16.4.190	172.16.4.191
153	172.16.4.192/29	172.16.4.193 – 172.16.4.198	172.16.4.199
154	172.16.4.200/29	172.16.4.201 – 172.16.4.206	172.16.4.207
155	172.16.4.208/29	172.16.4.209 – 172.16.4.214	172.16.4.215
156	172.16.4.216/29	172.16.4.217 – 172.16.4.222	172.16.4.223
157	172.16.4.224/29	172.16.4.225 – 172.16.4.230	172.16.4.231
158	172.16.4.232/29	172.16.4.233 – 172.16.4.238	172.16.4.239
159	172.16.4.240/29	172.16.4.241 – 172.16.4.246	172.16.4.247
160	172.16.4.248/29	172.16.4.249 – 172.16.4.254	172.16.4.255
161	172.16.5.0/29	172.16.5.1 – 172.16.5.6	172.16.5.7
162	172.16.5.8/29	172.16.5.9 – 172.16.5.14	172.16.5.15
163	172.16.5.16/29	172.16.5.17 – 172.16.5.22	172.16.5.23
164	172.16.5.24/29	172.16.5.25 – 172.16.5.30	172.16.5.31
165	172.16.5.32/29	172.16.5.33 – 172.16.5.38	172.16.5.39
166	172.16.5.40/29	172.16.5.41 – 172.16.5.46	172.16.5.47
167	172.16.5.48/29	172.16.5.49 – 172.16.5.54	172.16.5.55
168	172.16.5.56/29	172.16.5.57 – 172.16.5.62	172.16.5.63
169	172.16.5.64/29	172.16.5.65 – 172.16.5.70	172.16.5.71
170	172.16.5.72/29	172.16.5.73 – 172.16.5.78	172.16.5.79
171	172.16.5.80/29	172.16.5.81 – 172.16.5.86	172.16.5.87
172	172.16.5.88/29	172.16.5.89 – 172.16.5.94	172.16.5.95
173	172.16.5.96/29	172.16.5.97 – 172.16.5.102	172.16.5.103
174	172.16.5.104/29	172.16.5.105 – 172.16.5.110	172.16.5.111
175	172.16.5.112/29	172.16.5.113 – 172.16.5.118	172.16.5.119
176	172.16.5.120/29	172.16.5.121 – 172.16.5.126	172.16.5.127
177	172.16.5.128/29	172.16.5.129 – 172.16.5.134	172.16.5.135
178	172.16.5.136/29	172.16.5.137 – 172.16.5.142	172.16.5.143
179	172.16.5.144/29	172.16.5.145 – 172.16.5.150	172.16.5.151
180	172.16.5.152/29	172.16.5.153 – 172.16.5.158	172.16.5.159
181	172.16.5.160/29	172.16.5.161 – 172.16.5.166	172.16.5.167
182	172.16.5.168/29	172.16.5.169 – 172.16.5.174	172.16.5.175
183	172.16.5.176/29	172.16.5.177 – 172.16.5.182	172.16.5.183
184	172.16.5.184/29	172.16.5.185 – 172.16.5.190	172.16.5.191
185	172.16.5.192/29	172.16.5.193 – 172.16.5.198	172.16.5.199
186	172.16.5.200/29	172.16.5.201 – 172.16.5.206	172.16.5.207
187	172.16.5.208/29	172.16.5.209 – 172.16.5.214	172.16.5.215
188	172.16.5.216/29	172.16.5.217 – 172.16.5.222	172.16.5.223
189	172.16.5.224/29	172.16.5.225 – 172.16.5.230	172.16.5.231
190	172.16.5.232/29	172.16.5.233 – 172.16.5.238	172.16.5.239
191	172.16.5.240/29	172.16.5.241 – 172.16.5.246	172.16.5.247
192	172.16.5.248/29	172.16.5.249 – 172.16.5.254	172.16.5.255
193	172.16.6.0/29	172.16.6.1 – 172.16.6.6	172.16.6.7
194	172.16.6.8/29	172.16.6.9 – 172.16.6.14	172.16.6.15
195	172.16.6.16/29	172.16.6.17 – 172.16.6.22	172.16.6.23
196	172.16.6.24/29	172.16.6.25 – 172.16.6.30	172.16.6.31
197	172.16.6.32/29	172.16.6.33 – 172.16.6.38	172.16.6.39
198	172.16.6.40/29	172.16.6.41 – 172.16.6.46	172.16.6.47
199	172.16.6.48/29	172.16.6.49 – 172.16.6.54	172.16.6.55
200	172.16.6.56/29	172.16.6.57 – 172.16.6.62	172.16.6.63
201	172.16.6.64/29	172.16.6.65 – 172.16.6.70	172.16.6.71
202	172.16.6.72/29	172.16.6.73 – 172.16.6.78	172.16.6.79
203	172.16.6.80/29	172.16.6.81 – 172.16.6.86	172.16.6.87
204	172.16.6.88/29	172.16.6.89 – 172.16.6.94	172.16.6.95
205	172.16.6.96/29	172.16.6.97 – 172.16.6.102	172.16.6.103
206	172.16.6.104/29	172.16.6.105 – 172.16.6.110	172.16.6.111
207	172.16.6.112/29	172.16.6.113 – 172.16.6.118	172.16.6.119
208	172.16.6.120/29	172.16.6.121 – 172.16.6.126	172.16.6.127
209	172.16.6.128/29	172.16.6.129 – 172.16.6.134	172.16.6.135
210	172.16.6.136/29	172.16.6.137 – 172.16.6.142	172.16.6.143
211	172.16.6.144/29	172.16.6.145 – 172.16.6.150	172.16.6.151
212	172.16.6.152/29	172.16.6.153 – 172.16.6.158	172.16.6.159
213	172.16.6.160/29	172.16.6.161 – 172.16.6.166	172.16.6.167
214	172.16.6.168/29	172.16.6.169 – 172.16.6.174	172.16.6.175
215	172.16.6.176/29	172.16.6.177 – 172.16.6.182	172.16.6.183
216	172.16.6.184/29	172.16.6.185 – 172.16.6.190	172.16.6.191
217	172.16.6.192/29	172.16.6.193 – 172.16.6.198	172.16.6.199
218	172.16.6.200/29	172.16.6.201 – 172.16.6.206	172.16.6.207
219	172.16.6.208/29	172.16.6.209 – 172.16.6.214	172.16.6.215
220	172.16.6.216/29	172.16.6.217 – 172.16.6.222	172.16.6.223
221	172.16.6.224/29	172.16.6.225 – 172.16.6.230	172.16.6.231
222	172.16.6.232/29	172.16.6.233 – 172.16.6.238	172.16.6.239
223	172.16.6.240/29	172.16.6.241 – 172.16.6.246	172.16.6.247
224	172.16.6.248/29	172.16.6.249 – 172.16.6.254	172.16.6.255
225	172.16.7.0/29	172.16.7.1 – 172.16.7.6	172.16.7.7
226	172.16.7.8/29	172.16.7.9 – 172.16.7.14	172.16.7.15
227	172.16.7.16/29	172.16.7.17 – 172.16.7.22	172.16.7.23
228	172.16.7.24/29	172.16.7.25 – 172.16.7.30	172.16.7.31
229	172.16.7.32/29	172.16.7.33 – 172.16.7.38	172.16.7.39
230	172.16.7.40/29	172.16.7.41 – 172.16.7.46	172.16.7.47
231	172.16.7.48/29	172.16.7.49 – 172.16.7.54	172.16.7.55
232	172.16.7.56/29	172.16.7.57 – 172.16.7.62	172.16.7.63
233	172.16.7.64/29	172.16.7.65 – 172.16.7.70	172.16.7.71
234	172.16.7.72/29	172.16.7.73 – 172.16.7.78	172.16.7.79
235	172.16.7.80/29	172.16.7.81 – 172.16.7.86	172.16.7.87
236	172.16.7.88/29	172.16.7.89 – 172.16.7.94	172.16.7.95
237	172.16.7.96/29	172.16.7.97 – 172.16.7.102	172.16.7.103
238	172.16.7.104/29	172.16.7.105 – 172.16.7.110	172.16.7.111
239	172.16.7.112/29	172.16.7.113 – 172.16.7.118	172.16.7.119
240	172.16.7.120/29	172.16.7.121 – 172.16.7.126	172.16.7.127
241	172.16.7.128/29	172.16.7.129 – 172.16.7.134	172.16.7.135
242	172.16.7.136/29	172.16.7.137 – 172.16.7.142	172.16.7.143
243	172.16.7.144/29	172.16.7.145 – 172.16.7.150	172.16.7.151
244	172.16.7.152/29	172.16.7.153 – 172.16.7.158	172.16.7.159
245	172.16.7.160/29	172.16.7.161 – 172.16.7.166	172.16.7.167
246	172.16.7.168/29	172.16.7.169 – 172.16.7.174	172.16.7.175
247	172.16.7.176/29	172.16.7.177 – 172.16.7.182	172.16.7.183
248	172.16.7.184/29	172.16.7.185 – 172.16.7.190	172.16.7.191
249	172.16.7.192/29	172.16.7.193 – 172.16.7.198	172.16.7.199
250	172.16.7.200/29	172.16.7.201 – 172.16.7.206	172.16.7.207
251	172.16.7.208/29	172.16.7.209 – 172.16.7.214	172.16.7.215
252	172.16.7.216/29	172.16.7.217 – 172.16.7.222	172.16.7.223
253	172.16.7.224/29	172.16.7.225 – 172.16.7.230	172.16.7.231
254	172.16.7.232/29	172.16.7.233 – 172.16.7.238	172.16.7.239
255	172.16.7.240/29	172.16.7.241 – 172.16.7.246	172.16.7.247
256	172.16.7.248/29	172.16.7.249 – 172.16.7.254	172.16.7.255

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 /20
/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	-
/20	255.255.240.0	4,096	4,094	1
/21	255.255.248.0	2,048	2,046	2 split →
/22	255.255.252.0	1,024	1,022	4 split →
/23	255.255.254.0	512	510	8 split →
/24	255.255.255.0	256	254	16 split →
/25	255.255.255.128	128	126	32 split →
/26	255.255.255.192	64	62	64 split →
/27	255.255.255.224	32	30	128 split →
/28	255.255.255.240	16	14	256 split →
/29	255.255.255.248	8	6	512 split →
/30	255.255.255.252	4	2	1,024 split →
/31	255.255.255.254	2	2	2,048 split →
/32	255.255.255.255	1	1	4,096 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 →