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)10.5.176.0/21

network10.5.176.0/21

broadcast10.5.183.255

first host10.5.176.1

last host10.5.183.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.176.0/21

address00001010.00000101.10110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.10110000.00000000

broadcast00001010.00000101.10110111.11111111

green = network part, grey = host part

hex0x0a05b000

decimal168144896

reverse dns0.176.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:b000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.5.176.0/29	10.5.176.1 – 10.5.176.6	10.5.176.7
2	10.5.176.8/29	10.5.176.9 – 10.5.176.14	10.5.176.15
3	10.5.176.16/29	10.5.176.17 – 10.5.176.22	10.5.176.23
4	10.5.176.24/29	10.5.176.25 – 10.5.176.30	10.5.176.31
5	10.5.176.32/29	10.5.176.33 – 10.5.176.38	10.5.176.39
6	10.5.176.40/29	10.5.176.41 – 10.5.176.46	10.5.176.47
7	10.5.176.48/29	10.5.176.49 – 10.5.176.54	10.5.176.55
8	10.5.176.56/29	10.5.176.57 – 10.5.176.62	10.5.176.63
9	10.5.176.64/29	10.5.176.65 – 10.5.176.70	10.5.176.71
10	10.5.176.72/29	10.5.176.73 – 10.5.176.78	10.5.176.79
11	10.5.176.80/29	10.5.176.81 – 10.5.176.86	10.5.176.87
12	10.5.176.88/29	10.5.176.89 – 10.5.176.94	10.5.176.95
13	10.5.176.96/29	10.5.176.97 – 10.5.176.102	10.5.176.103
14	10.5.176.104/29	10.5.176.105 – 10.5.176.110	10.5.176.111
15	10.5.176.112/29	10.5.176.113 – 10.5.176.118	10.5.176.119
16	10.5.176.120/29	10.5.176.121 – 10.5.176.126	10.5.176.127
17	10.5.176.128/29	10.5.176.129 – 10.5.176.134	10.5.176.135
18	10.5.176.136/29	10.5.176.137 – 10.5.176.142	10.5.176.143
19	10.5.176.144/29	10.5.176.145 – 10.5.176.150	10.5.176.151
20	10.5.176.152/29	10.5.176.153 – 10.5.176.158	10.5.176.159
21	10.5.176.160/29	10.5.176.161 – 10.5.176.166	10.5.176.167
22	10.5.176.168/29	10.5.176.169 – 10.5.176.174	10.5.176.175
23	10.5.176.176/29	10.5.176.177 – 10.5.176.182	10.5.176.183
24	10.5.176.184/29	10.5.176.185 – 10.5.176.190	10.5.176.191
25	10.5.176.192/29	10.5.176.193 – 10.5.176.198	10.5.176.199
26	10.5.176.200/29	10.5.176.201 – 10.5.176.206	10.5.176.207
27	10.5.176.208/29	10.5.176.209 – 10.5.176.214	10.5.176.215
28	10.5.176.216/29	10.5.176.217 – 10.5.176.222	10.5.176.223
29	10.5.176.224/29	10.5.176.225 – 10.5.176.230	10.5.176.231
30	10.5.176.232/29	10.5.176.233 – 10.5.176.238	10.5.176.239
31	10.5.176.240/29	10.5.176.241 – 10.5.176.246	10.5.176.247
32	10.5.176.248/29	10.5.176.249 – 10.5.176.254	10.5.176.255
33	10.5.177.0/29	10.5.177.1 – 10.5.177.6	10.5.177.7
34	10.5.177.8/29	10.5.177.9 – 10.5.177.14	10.5.177.15
35	10.5.177.16/29	10.5.177.17 – 10.5.177.22	10.5.177.23
36	10.5.177.24/29	10.5.177.25 – 10.5.177.30	10.5.177.31
37	10.5.177.32/29	10.5.177.33 – 10.5.177.38	10.5.177.39
38	10.5.177.40/29	10.5.177.41 – 10.5.177.46	10.5.177.47
39	10.5.177.48/29	10.5.177.49 – 10.5.177.54	10.5.177.55
40	10.5.177.56/29	10.5.177.57 – 10.5.177.62	10.5.177.63
41	10.5.177.64/29	10.5.177.65 – 10.5.177.70	10.5.177.71
42	10.5.177.72/29	10.5.177.73 – 10.5.177.78	10.5.177.79
43	10.5.177.80/29	10.5.177.81 – 10.5.177.86	10.5.177.87
44	10.5.177.88/29	10.5.177.89 – 10.5.177.94	10.5.177.95
45	10.5.177.96/29	10.5.177.97 – 10.5.177.102	10.5.177.103
46	10.5.177.104/29	10.5.177.105 – 10.5.177.110	10.5.177.111
47	10.5.177.112/29	10.5.177.113 – 10.5.177.118	10.5.177.119
48	10.5.177.120/29	10.5.177.121 – 10.5.177.126	10.5.177.127
49	10.5.177.128/29	10.5.177.129 – 10.5.177.134	10.5.177.135
50	10.5.177.136/29	10.5.177.137 – 10.5.177.142	10.5.177.143
51	10.5.177.144/29	10.5.177.145 – 10.5.177.150	10.5.177.151
52	10.5.177.152/29	10.5.177.153 – 10.5.177.158	10.5.177.159
53	10.5.177.160/29	10.5.177.161 – 10.5.177.166	10.5.177.167
54	10.5.177.168/29	10.5.177.169 – 10.5.177.174	10.5.177.175
55	10.5.177.176/29	10.5.177.177 – 10.5.177.182	10.5.177.183
56	10.5.177.184/29	10.5.177.185 – 10.5.177.190	10.5.177.191
57	10.5.177.192/29	10.5.177.193 – 10.5.177.198	10.5.177.199
58	10.5.177.200/29	10.5.177.201 – 10.5.177.206	10.5.177.207
59	10.5.177.208/29	10.5.177.209 – 10.5.177.214	10.5.177.215
60	10.5.177.216/29	10.5.177.217 – 10.5.177.222	10.5.177.223
61	10.5.177.224/29	10.5.177.225 – 10.5.177.230	10.5.177.231
62	10.5.177.232/29	10.5.177.233 – 10.5.177.238	10.5.177.239
63	10.5.177.240/29	10.5.177.241 – 10.5.177.246	10.5.177.247
64	10.5.177.248/29	10.5.177.249 – 10.5.177.254	10.5.177.255
65	10.5.178.0/29	10.5.178.1 – 10.5.178.6	10.5.178.7
66	10.5.178.8/29	10.5.178.9 – 10.5.178.14	10.5.178.15
67	10.5.178.16/29	10.5.178.17 – 10.5.178.22	10.5.178.23
68	10.5.178.24/29	10.5.178.25 – 10.5.178.30	10.5.178.31
69	10.5.178.32/29	10.5.178.33 – 10.5.178.38	10.5.178.39
70	10.5.178.40/29	10.5.178.41 – 10.5.178.46	10.5.178.47
71	10.5.178.48/29	10.5.178.49 – 10.5.178.54	10.5.178.55
72	10.5.178.56/29	10.5.178.57 – 10.5.178.62	10.5.178.63
73	10.5.178.64/29	10.5.178.65 – 10.5.178.70	10.5.178.71
74	10.5.178.72/29	10.5.178.73 – 10.5.178.78	10.5.178.79
75	10.5.178.80/29	10.5.178.81 – 10.5.178.86	10.5.178.87
76	10.5.178.88/29	10.5.178.89 – 10.5.178.94	10.5.178.95
77	10.5.178.96/29	10.5.178.97 – 10.5.178.102	10.5.178.103
78	10.5.178.104/29	10.5.178.105 – 10.5.178.110	10.5.178.111
79	10.5.178.112/29	10.5.178.113 – 10.5.178.118	10.5.178.119
80	10.5.178.120/29	10.5.178.121 – 10.5.178.126	10.5.178.127
81	10.5.178.128/29	10.5.178.129 – 10.5.178.134	10.5.178.135
82	10.5.178.136/29	10.5.178.137 – 10.5.178.142	10.5.178.143
83	10.5.178.144/29	10.5.178.145 – 10.5.178.150	10.5.178.151
84	10.5.178.152/29	10.5.178.153 – 10.5.178.158	10.5.178.159
85	10.5.178.160/29	10.5.178.161 – 10.5.178.166	10.5.178.167
86	10.5.178.168/29	10.5.178.169 – 10.5.178.174	10.5.178.175
87	10.5.178.176/29	10.5.178.177 – 10.5.178.182	10.5.178.183
88	10.5.178.184/29	10.5.178.185 – 10.5.178.190	10.5.178.191
89	10.5.178.192/29	10.5.178.193 – 10.5.178.198	10.5.178.199
90	10.5.178.200/29	10.5.178.201 – 10.5.178.206	10.5.178.207
91	10.5.178.208/29	10.5.178.209 – 10.5.178.214	10.5.178.215
92	10.5.178.216/29	10.5.178.217 – 10.5.178.222	10.5.178.223
93	10.5.178.224/29	10.5.178.225 – 10.5.178.230	10.5.178.231
94	10.5.178.232/29	10.5.178.233 – 10.5.178.238	10.5.178.239
95	10.5.178.240/29	10.5.178.241 – 10.5.178.246	10.5.178.247
96	10.5.178.248/29	10.5.178.249 – 10.5.178.254	10.5.178.255
97	10.5.179.0/29	10.5.179.1 – 10.5.179.6	10.5.179.7
98	10.5.179.8/29	10.5.179.9 – 10.5.179.14	10.5.179.15
99	10.5.179.16/29	10.5.179.17 – 10.5.179.22	10.5.179.23
100	10.5.179.24/29	10.5.179.25 – 10.5.179.30	10.5.179.31
101	10.5.179.32/29	10.5.179.33 – 10.5.179.38	10.5.179.39
102	10.5.179.40/29	10.5.179.41 – 10.5.179.46	10.5.179.47
103	10.5.179.48/29	10.5.179.49 – 10.5.179.54	10.5.179.55
104	10.5.179.56/29	10.5.179.57 – 10.5.179.62	10.5.179.63
105	10.5.179.64/29	10.5.179.65 – 10.5.179.70	10.5.179.71
106	10.5.179.72/29	10.5.179.73 – 10.5.179.78	10.5.179.79
107	10.5.179.80/29	10.5.179.81 – 10.5.179.86	10.5.179.87
108	10.5.179.88/29	10.5.179.89 – 10.5.179.94	10.5.179.95
109	10.5.179.96/29	10.5.179.97 – 10.5.179.102	10.5.179.103
110	10.5.179.104/29	10.5.179.105 – 10.5.179.110	10.5.179.111
111	10.5.179.112/29	10.5.179.113 – 10.5.179.118	10.5.179.119
112	10.5.179.120/29	10.5.179.121 – 10.5.179.126	10.5.179.127
113	10.5.179.128/29	10.5.179.129 – 10.5.179.134	10.5.179.135
114	10.5.179.136/29	10.5.179.137 – 10.5.179.142	10.5.179.143
115	10.5.179.144/29	10.5.179.145 – 10.5.179.150	10.5.179.151
116	10.5.179.152/29	10.5.179.153 – 10.5.179.158	10.5.179.159
117	10.5.179.160/29	10.5.179.161 – 10.5.179.166	10.5.179.167
118	10.5.179.168/29	10.5.179.169 – 10.5.179.174	10.5.179.175
119	10.5.179.176/29	10.5.179.177 – 10.5.179.182	10.5.179.183
120	10.5.179.184/29	10.5.179.185 – 10.5.179.190	10.5.179.191
121	10.5.179.192/29	10.5.179.193 – 10.5.179.198	10.5.179.199
122	10.5.179.200/29	10.5.179.201 – 10.5.179.206	10.5.179.207
123	10.5.179.208/29	10.5.179.209 – 10.5.179.214	10.5.179.215
124	10.5.179.216/29	10.5.179.217 – 10.5.179.222	10.5.179.223
125	10.5.179.224/29	10.5.179.225 – 10.5.179.230	10.5.179.231
126	10.5.179.232/29	10.5.179.233 – 10.5.179.238	10.5.179.239
127	10.5.179.240/29	10.5.179.241 – 10.5.179.246	10.5.179.247
128	10.5.179.248/29	10.5.179.249 – 10.5.179.254	10.5.179.255
129	10.5.180.0/29	10.5.180.1 – 10.5.180.6	10.5.180.7
130	10.5.180.8/29	10.5.180.9 – 10.5.180.14	10.5.180.15
131	10.5.180.16/29	10.5.180.17 – 10.5.180.22	10.5.180.23
132	10.5.180.24/29	10.5.180.25 – 10.5.180.30	10.5.180.31
133	10.5.180.32/29	10.5.180.33 – 10.5.180.38	10.5.180.39
134	10.5.180.40/29	10.5.180.41 – 10.5.180.46	10.5.180.47
135	10.5.180.48/29	10.5.180.49 – 10.5.180.54	10.5.180.55
136	10.5.180.56/29	10.5.180.57 – 10.5.180.62	10.5.180.63
137	10.5.180.64/29	10.5.180.65 – 10.5.180.70	10.5.180.71
138	10.5.180.72/29	10.5.180.73 – 10.5.180.78	10.5.180.79
139	10.5.180.80/29	10.5.180.81 – 10.5.180.86	10.5.180.87
140	10.5.180.88/29	10.5.180.89 – 10.5.180.94	10.5.180.95
141	10.5.180.96/29	10.5.180.97 – 10.5.180.102	10.5.180.103
142	10.5.180.104/29	10.5.180.105 – 10.5.180.110	10.5.180.111
143	10.5.180.112/29	10.5.180.113 – 10.5.180.118	10.5.180.119
144	10.5.180.120/29	10.5.180.121 – 10.5.180.126	10.5.180.127
145	10.5.180.128/29	10.5.180.129 – 10.5.180.134	10.5.180.135
146	10.5.180.136/29	10.5.180.137 – 10.5.180.142	10.5.180.143
147	10.5.180.144/29	10.5.180.145 – 10.5.180.150	10.5.180.151
148	10.5.180.152/29	10.5.180.153 – 10.5.180.158	10.5.180.159
149	10.5.180.160/29	10.5.180.161 – 10.5.180.166	10.5.180.167
150	10.5.180.168/29	10.5.180.169 – 10.5.180.174	10.5.180.175
151	10.5.180.176/29	10.5.180.177 – 10.5.180.182	10.5.180.183
152	10.5.180.184/29	10.5.180.185 – 10.5.180.190	10.5.180.191
153	10.5.180.192/29	10.5.180.193 – 10.5.180.198	10.5.180.199
154	10.5.180.200/29	10.5.180.201 – 10.5.180.206	10.5.180.207
155	10.5.180.208/29	10.5.180.209 – 10.5.180.214	10.5.180.215
156	10.5.180.216/29	10.5.180.217 – 10.5.180.222	10.5.180.223
157	10.5.180.224/29	10.5.180.225 – 10.5.180.230	10.5.180.231
158	10.5.180.232/29	10.5.180.233 – 10.5.180.238	10.5.180.239
159	10.5.180.240/29	10.5.180.241 – 10.5.180.246	10.5.180.247
160	10.5.180.248/29	10.5.180.249 – 10.5.180.254	10.5.180.255
161	10.5.181.0/29	10.5.181.1 – 10.5.181.6	10.5.181.7
162	10.5.181.8/29	10.5.181.9 – 10.5.181.14	10.5.181.15
163	10.5.181.16/29	10.5.181.17 – 10.5.181.22	10.5.181.23
164	10.5.181.24/29	10.5.181.25 – 10.5.181.30	10.5.181.31
165	10.5.181.32/29	10.5.181.33 – 10.5.181.38	10.5.181.39
166	10.5.181.40/29	10.5.181.41 – 10.5.181.46	10.5.181.47
167	10.5.181.48/29	10.5.181.49 – 10.5.181.54	10.5.181.55
168	10.5.181.56/29	10.5.181.57 – 10.5.181.62	10.5.181.63
169	10.5.181.64/29	10.5.181.65 – 10.5.181.70	10.5.181.71
170	10.5.181.72/29	10.5.181.73 – 10.5.181.78	10.5.181.79
171	10.5.181.80/29	10.5.181.81 – 10.5.181.86	10.5.181.87
172	10.5.181.88/29	10.5.181.89 – 10.5.181.94	10.5.181.95
173	10.5.181.96/29	10.5.181.97 – 10.5.181.102	10.5.181.103
174	10.5.181.104/29	10.5.181.105 – 10.5.181.110	10.5.181.111
175	10.5.181.112/29	10.5.181.113 – 10.5.181.118	10.5.181.119
176	10.5.181.120/29	10.5.181.121 – 10.5.181.126	10.5.181.127
177	10.5.181.128/29	10.5.181.129 – 10.5.181.134	10.5.181.135
178	10.5.181.136/29	10.5.181.137 – 10.5.181.142	10.5.181.143
179	10.5.181.144/29	10.5.181.145 – 10.5.181.150	10.5.181.151
180	10.5.181.152/29	10.5.181.153 – 10.5.181.158	10.5.181.159
181	10.5.181.160/29	10.5.181.161 – 10.5.181.166	10.5.181.167
182	10.5.181.168/29	10.5.181.169 – 10.5.181.174	10.5.181.175
183	10.5.181.176/29	10.5.181.177 – 10.5.181.182	10.5.181.183
184	10.5.181.184/29	10.5.181.185 – 10.5.181.190	10.5.181.191
185	10.5.181.192/29	10.5.181.193 – 10.5.181.198	10.5.181.199
186	10.5.181.200/29	10.5.181.201 – 10.5.181.206	10.5.181.207
187	10.5.181.208/29	10.5.181.209 – 10.5.181.214	10.5.181.215
188	10.5.181.216/29	10.5.181.217 – 10.5.181.222	10.5.181.223
189	10.5.181.224/29	10.5.181.225 – 10.5.181.230	10.5.181.231
190	10.5.181.232/29	10.5.181.233 – 10.5.181.238	10.5.181.239
191	10.5.181.240/29	10.5.181.241 – 10.5.181.246	10.5.181.247
192	10.5.181.248/29	10.5.181.249 – 10.5.181.254	10.5.181.255
193	10.5.182.0/29	10.5.182.1 – 10.5.182.6	10.5.182.7
194	10.5.182.8/29	10.5.182.9 – 10.5.182.14	10.5.182.15
195	10.5.182.16/29	10.5.182.17 – 10.5.182.22	10.5.182.23
196	10.5.182.24/29	10.5.182.25 – 10.5.182.30	10.5.182.31
197	10.5.182.32/29	10.5.182.33 – 10.5.182.38	10.5.182.39
198	10.5.182.40/29	10.5.182.41 – 10.5.182.46	10.5.182.47
199	10.5.182.48/29	10.5.182.49 – 10.5.182.54	10.5.182.55
200	10.5.182.56/29	10.5.182.57 – 10.5.182.62	10.5.182.63
201	10.5.182.64/29	10.5.182.65 – 10.5.182.70	10.5.182.71
202	10.5.182.72/29	10.5.182.73 – 10.5.182.78	10.5.182.79
203	10.5.182.80/29	10.5.182.81 – 10.5.182.86	10.5.182.87
204	10.5.182.88/29	10.5.182.89 – 10.5.182.94	10.5.182.95
205	10.5.182.96/29	10.5.182.97 – 10.5.182.102	10.5.182.103
206	10.5.182.104/29	10.5.182.105 – 10.5.182.110	10.5.182.111
207	10.5.182.112/29	10.5.182.113 – 10.5.182.118	10.5.182.119
208	10.5.182.120/29	10.5.182.121 – 10.5.182.126	10.5.182.127
209	10.5.182.128/29	10.5.182.129 – 10.5.182.134	10.5.182.135
210	10.5.182.136/29	10.5.182.137 – 10.5.182.142	10.5.182.143
211	10.5.182.144/29	10.5.182.145 – 10.5.182.150	10.5.182.151
212	10.5.182.152/29	10.5.182.153 – 10.5.182.158	10.5.182.159
213	10.5.182.160/29	10.5.182.161 – 10.5.182.166	10.5.182.167
214	10.5.182.168/29	10.5.182.169 – 10.5.182.174	10.5.182.175
215	10.5.182.176/29	10.5.182.177 – 10.5.182.182	10.5.182.183
216	10.5.182.184/29	10.5.182.185 – 10.5.182.190	10.5.182.191
217	10.5.182.192/29	10.5.182.193 – 10.5.182.198	10.5.182.199
218	10.5.182.200/29	10.5.182.201 – 10.5.182.206	10.5.182.207
219	10.5.182.208/29	10.5.182.209 – 10.5.182.214	10.5.182.215
220	10.5.182.216/29	10.5.182.217 – 10.5.182.222	10.5.182.223
221	10.5.182.224/29	10.5.182.225 – 10.5.182.230	10.5.182.231
222	10.5.182.232/29	10.5.182.233 – 10.5.182.238	10.5.182.239
223	10.5.182.240/29	10.5.182.241 – 10.5.182.246	10.5.182.247
224	10.5.182.248/29	10.5.182.249 – 10.5.182.254	10.5.182.255
225	10.5.183.0/29	10.5.183.1 – 10.5.183.6	10.5.183.7
226	10.5.183.8/29	10.5.183.9 – 10.5.183.14	10.5.183.15
227	10.5.183.16/29	10.5.183.17 – 10.5.183.22	10.5.183.23
228	10.5.183.24/29	10.5.183.25 – 10.5.183.30	10.5.183.31
229	10.5.183.32/29	10.5.183.33 – 10.5.183.38	10.5.183.39
230	10.5.183.40/29	10.5.183.41 – 10.5.183.46	10.5.183.47
231	10.5.183.48/29	10.5.183.49 – 10.5.183.54	10.5.183.55
232	10.5.183.56/29	10.5.183.57 – 10.5.183.62	10.5.183.63
233	10.5.183.64/29	10.5.183.65 – 10.5.183.70	10.5.183.71
234	10.5.183.72/29	10.5.183.73 – 10.5.183.78	10.5.183.79
235	10.5.183.80/29	10.5.183.81 – 10.5.183.86	10.5.183.87
236	10.5.183.88/29	10.5.183.89 – 10.5.183.94	10.5.183.95
237	10.5.183.96/29	10.5.183.97 – 10.5.183.102	10.5.183.103
238	10.5.183.104/29	10.5.183.105 – 10.5.183.110	10.5.183.111
239	10.5.183.112/29	10.5.183.113 – 10.5.183.118	10.5.183.119
240	10.5.183.120/29	10.5.183.121 – 10.5.183.126	10.5.183.127
241	10.5.183.128/29	10.5.183.129 – 10.5.183.134	10.5.183.135
242	10.5.183.136/29	10.5.183.137 – 10.5.183.142	10.5.183.143
243	10.5.183.144/29	10.5.183.145 – 10.5.183.150	10.5.183.151
244	10.5.183.152/29	10.5.183.153 – 10.5.183.158	10.5.183.159
245	10.5.183.160/29	10.5.183.161 – 10.5.183.166	10.5.183.167
246	10.5.183.168/29	10.5.183.169 – 10.5.183.174	10.5.183.175
247	10.5.183.176/29	10.5.183.177 – 10.5.183.182	10.5.183.183
248	10.5.183.184/29	10.5.183.185 – 10.5.183.190	10.5.183.191
249	10.5.183.192/29	10.5.183.193 – 10.5.183.198	10.5.183.199
250	10.5.183.200/29	10.5.183.201 – 10.5.183.206	10.5.183.207
251	10.5.183.208/29	10.5.183.209 – 10.5.183.214	10.5.183.215
252	10.5.183.216/29	10.5.183.217 – 10.5.183.222	10.5.183.223
253	10.5.183.224/29	10.5.183.225 – 10.5.183.230	10.5.183.231
254	10.5.183.232/29	10.5.183.233 – 10.5.183.238	10.5.183.239
255	10.5.183.240/29	10.5.183.241 – 10.5.183.246	10.5.183.247
256	10.5.183.248/29	10.5.183.249 – 10.5.183.254	10.5.183.255

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