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)10.5.80.0/21

network10.5.80.0/21

broadcast10.5.87.255

first host10.5.80.1

last host10.5.87.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.80.0/21

address00001010.00000101.01010000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.01010000.00000000

broadcast00001010.00000101.01010111.11111111

green = network part, grey = host part

hex0x0a055000

decimal168120320

reverse dns0.80.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:5000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.5.80.0/29	10.5.80.1 – 10.5.80.6	10.5.80.7
2	10.5.80.8/29	10.5.80.9 – 10.5.80.14	10.5.80.15
3	10.5.80.16/29	10.5.80.17 – 10.5.80.22	10.5.80.23
4	10.5.80.24/29	10.5.80.25 – 10.5.80.30	10.5.80.31
5	10.5.80.32/29	10.5.80.33 – 10.5.80.38	10.5.80.39
6	10.5.80.40/29	10.5.80.41 – 10.5.80.46	10.5.80.47
7	10.5.80.48/29	10.5.80.49 – 10.5.80.54	10.5.80.55
8	10.5.80.56/29	10.5.80.57 – 10.5.80.62	10.5.80.63
9	10.5.80.64/29	10.5.80.65 – 10.5.80.70	10.5.80.71
10	10.5.80.72/29	10.5.80.73 – 10.5.80.78	10.5.80.79
11	10.5.80.80/29	10.5.80.81 – 10.5.80.86	10.5.80.87
12	10.5.80.88/29	10.5.80.89 – 10.5.80.94	10.5.80.95
13	10.5.80.96/29	10.5.80.97 – 10.5.80.102	10.5.80.103
14	10.5.80.104/29	10.5.80.105 – 10.5.80.110	10.5.80.111
15	10.5.80.112/29	10.5.80.113 – 10.5.80.118	10.5.80.119
16	10.5.80.120/29	10.5.80.121 – 10.5.80.126	10.5.80.127
17	10.5.80.128/29	10.5.80.129 – 10.5.80.134	10.5.80.135
18	10.5.80.136/29	10.5.80.137 – 10.5.80.142	10.5.80.143
19	10.5.80.144/29	10.5.80.145 – 10.5.80.150	10.5.80.151
20	10.5.80.152/29	10.5.80.153 – 10.5.80.158	10.5.80.159
21	10.5.80.160/29	10.5.80.161 – 10.5.80.166	10.5.80.167
22	10.5.80.168/29	10.5.80.169 – 10.5.80.174	10.5.80.175
23	10.5.80.176/29	10.5.80.177 – 10.5.80.182	10.5.80.183
24	10.5.80.184/29	10.5.80.185 – 10.5.80.190	10.5.80.191
25	10.5.80.192/29	10.5.80.193 – 10.5.80.198	10.5.80.199
26	10.5.80.200/29	10.5.80.201 – 10.5.80.206	10.5.80.207
27	10.5.80.208/29	10.5.80.209 – 10.5.80.214	10.5.80.215
28	10.5.80.216/29	10.5.80.217 – 10.5.80.222	10.5.80.223
29	10.5.80.224/29	10.5.80.225 – 10.5.80.230	10.5.80.231
30	10.5.80.232/29	10.5.80.233 – 10.5.80.238	10.5.80.239
31	10.5.80.240/29	10.5.80.241 – 10.5.80.246	10.5.80.247
32	10.5.80.248/29	10.5.80.249 – 10.5.80.254	10.5.80.255
33	10.5.81.0/29	10.5.81.1 – 10.5.81.6	10.5.81.7
34	10.5.81.8/29	10.5.81.9 – 10.5.81.14	10.5.81.15
35	10.5.81.16/29	10.5.81.17 – 10.5.81.22	10.5.81.23
36	10.5.81.24/29	10.5.81.25 – 10.5.81.30	10.5.81.31
37	10.5.81.32/29	10.5.81.33 – 10.5.81.38	10.5.81.39
38	10.5.81.40/29	10.5.81.41 – 10.5.81.46	10.5.81.47
39	10.5.81.48/29	10.5.81.49 – 10.5.81.54	10.5.81.55
40	10.5.81.56/29	10.5.81.57 – 10.5.81.62	10.5.81.63
41	10.5.81.64/29	10.5.81.65 – 10.5.81.70	10.5.81.71
42	10.5.81.72/29	10.5.81.73 – 10.5.81.78	10.5.81.79
43	10.5.81.80/29	10.5.81.81 – 10.5.81.86	10.5.81.87
44	10.5.81.88/29	10.5.81.89 – 10.5.81.94	10.5.81.95
45	10.5.81.96/29	10.5.81.97 – 10.5.81.102	10.5.81.103
46	10.5.81.104/29	10.5.81.105 – 10.5.81.110	10.5.81.111
47	10.5.81.112/29	10.5.81.113 – 10.5.81.118	10.5.81.119
48	10.5.81.120/29	10.5.81.121 – 10.5.81.126	10.5.81.127
49	10.5.81.128/29	10.5.81.129 – 10.5.81.134	10.5.81.135
50	10.5.81.136/29	10.5.81.137 – 10.5.81.142	10.5.81.143
51	10.5.81.144/29	10.5.81.145 – 10.5.81.150	10.5.81.151
52	10.5.81.152/29	10.5.81.153 – 10.5.81.158	10.5.81.159
53	10.5.81.160/29	10.5.81.161 – 10.5.81.166	10.5.81.167
54	10.5.81.168/29	10.5.81.169 – 10.5.81.174	10.5.81.175
55	10.5.81.176/29	10.5.81.177 – 10.5.81.182	10.5.81.183
56	10.5.81.184/29	10.5.81.185 – 10.5.81.190	10.5.81.191
57	10.5.81.192/29	10.5.81.193 – 10.5.81.198	10.5.81.199
58	10.5.81.200/29	10.5.81.201 – 10.5.81.206	10.5.81.207
59	10.5.81.208/29	10.5.81.209 – 10.5.81.214	10.5.81.215
60	10.5.81.216/29	10.5.81.217 – 10.5.81.222	10.5.81.223
61	10.5.81.224/29	10.5.81.225 – 10.5.81.230	10.5.81.231
62	10.5.81.232/29	10.5.81.233 – 10.5.81.238	10.5.81.239
63	10.5.81.240/29	10.5.81.241 – 10.5.81.246	10.5.81.247
64	10.5.81.248/29	10.5.81.249 – 10.5.81.254	10.5.81.255
65	10.5.82.0/29	10.5.82.1 – 10.5.82.6	10.5.82.7
66	10.5.82.8/29	10.5.82.9 – 10.5.82.14	10.5.82.15
67	10.5.82.16/29	10.5.82.17 – 10.5.82.22	10.5.82.23
68	10.5.82.24/29	10.5.82.25 – 10.5.82.30	10.5.82.31
69	10.5.82.32/29	10.5.82.33 – 10.5.82.38	10.5.82.39
70	10.5.82.40/29	10.5.82.41 – 10.5.82.46	10.5.82.47
71	10.5.82.48/29	10.5.82.49 – 10.5.82.54	10.5.82.55
72	10.5.82.56/29	10.5.82.57 – 10.5.82.62	10.5.82.63
73	10.5.82.64/29	10.5.82.65 – 10.5.82.70	10.5.82.71
74	10.5.82.72/29	10.5.82.73 – 10.5.82.78	10.5.82.79
75	10.5.82.80/29	10.5.82.81 – 10.5.82.86	10.5.82.87
76	10.5.82.88/29	10.5.82.89 – 10.5.82.94	10.5.82.95
77	10.5.82.96/29	10.5.82.97 – 10.5.82.102	10.5.82.103
78	10.5.82.104/29	10.5.82.105 – 10.5.82.110	10.5.82.111
79	10.5.82.112/29	10.5.82.113 – 10.5.82.118	10.5.82.119
80	10.5.82.120/29	10.5.82.121 – 10.5.82.126	10.5.82.127
81	10.5.82.128/29	10.5.82.129 – 10.5.82.134	10.5.82.135
82	10.5.82.136/29	10.5.82.137 – 10.5.82.142	10.5.82.143
83	10.5.82.144/29	10.5.82.145 – 10.5.82.150	10.5.82.151
84	10.5.82.152/29	10.5.82.153 – 10.5.82.158	10.5.82.159
85	10.5.82.160/29	10.5.82.161 – 10.5.82.166	10.5.82.167
86	10.5.82.168/29	10.5.82.169 – 10.5.82.174	10.5.82.175
87	10.5.82.176/29	10.5.82.177 – 10.5.82.182	10.5.82.183
88	10.5.82.184/29	10.5.82.185 – 10.5.82.190	10.5.82.191
89	10.5.82.192/29	10.5.82.193 – 10.5.82.198	10.5.82.199
90	10.5.82.200/29	10.5.82.201 – 10.5.82.206	10.5.82.207
91	10.5.82.208/29	10.5.82.209 – 10.5.82.214	10.5.82.215
92	10.5.82.216/29	10.5.82.217 – 10.5.82.222	10.5.82.223
93	10.5.82.224/29	10.5.82.225 – 10.5.82.230	10.5.82.231
94	10.5.82.232/29	10.5.82.233 – 10.5.82.238	10.5.82.239
95	10.5.82.240/29	10.5.82.241 – 10.5.82.246	10.5.82.247
96	10.5.82.248/29	10.5.82.249 – 10.5.82.254	10.5.82.255
97	10.5.83.0/29	10.5.83.1 – 10.5.83.6	10.5.83.7
98	10.5.83.8/29	10.5.83.9 – 10.5.83.14	10.5.83.15
99	10.5.83.16/29	10.5.83.17 – 10.5.83.22	10.5.83.23
100	10.5.83.24/29	10.5.83.25 – 10.5.83.30	10.5.83.31
101	10.5.83.32/29	10.5.83.33 – 10.5.83.38	10.5.83.39
102	10.5.83.40/29	10.5.83.41 – 10.5.83.46	10.5.83.47
103	10.5.83.48/29	10.5.83.49 – 10.5.83.54	10.5.83.55
104	10.5.83.56/29	10.5.83.57 – 10.5.83.62	10.5.83.63
105	10.5.83.64/29	10.5.83.65 – 10.5.83.70	10.5.83.71
106	10.5.83.72/29	10.5.83.73 – 10.5.83.78	10.5.83.79
107	10.5.83.80/29	10.5.83.81 – 10.5.83.86	10.5.83.87
108	10.5.83.88/29	10.5.83.89 – 10.5.83.94	10.5.83.95
109	10.5.83.96/29	10.5.83.97 – 10.5.83.102	10.5.83.103
110	10.5.83.104/29	10.5.83.105 – 10.5.83.110	10.5.83.111
111	10.5.83.112/29	10.5.83.113 – 10.5.83.118	10.5.83.119
112	10.5.83.120/29	10.5.83.121 – 10.5.83.126	10.5.83.127
113	10.5.83.128/29	10.5.83.129 – 10.5.83.134	10.5.83.135
114	10.5.83.136/29	10.5.83.137 – 10.5.83.142	10.5.83.143
115	10.5.83.144/29	10.5.83.145 – 10.5.83.150	10.5.83.151
116	10.5.83.152/29	10.5.83.153 – 10.5.83.158	10.5.83.159
117	10.5.83.160/29	10.5.83.161 – 10.5.83.166	10.5.83.167
118	10.5.83.168/29	10.5.83.169 – 10.5.83.174	10.5.83.175
119	10.5.83.176/29	10.5.83.177 – 10.5.83.182	10.5.83.183
120	10.5.83.184/29	10.5.83.185 – 10.5.83.190	10.5.83.191
121	10.5.83.192/29	10.5.83.193 – 10.5.83.198	10.5.83.199
122	10.5.83.200/29	10.5.83.201 – 10.5.83.206	10.5.83.207
123	10.5.83.208/29	10.5.83.209 – 10.5.83.214	10.5.83.215
124	10.5.83.216/29	10.5.83.217 – 10.5.83.222	10.5.83.223
125	10.5.83.224/29	10.5.83.225 – 10.5.83.230	10.5.83.231
126	10.5.83.232/29	10.5.83.233 – 10.5.83.238	10.5.83.239
127	10.5.83.240/29	10.5.83.241 – 10.5.83.246	10.5.83.247
128	10.5.83.248/29	10.5.83.249 – 10.5.83.254	10.5.83.255
129	10.5.84.0/29	10.5.84.1 – 10.5.84.6	10.5.84.7
130	10.5.84.8/29	10.5.84.9 – 10.5.84.14	10.5.84.15
131	10.5.84.16/29	10.5.84.17 – 10.5.84.22	10.5.84.23
132	10.5.84.24/29	10.5.84.25 – 10.5.84.30	10.5.84.31
133	10.5.84.32/29	10.5.84.33 – 10.5.84.38	10.5.84.39
134	10.5.84.40/29	10.5.84.41 – 10.5.84.46	10.5.84.47
135	10.5.84.48/29	10.5.84.49 – 10.5.84.54	10.5.84.55
136	10.5.84.56/29	10.5.84.57 – 10.5.84.62	10.5.84.63
137	10.5.84.64/29	10.5.84.65 – 10.5.84.70	10.5.84.71
138	10.5.84.72/29	10.5.84.73 – 10.5.84.78	10.5.84.79
139	10.5.84.80/29	10.5.84.81 – 10.5.84.86	10.5.84.87
140	10.5.84.88/29	10.5.84.89 – 10.5.84.94	10.5.84.95
141	10.5.84.96/29	10.5.84.97 – 10.5.84.102	10.5.84.103
142	10.5.84.104/29	10.5.84.105 – 10.5.84.110	10.5.84.111
143	10.5.84.112/29	10.5.84.113 – 10.5.84.118	10.5.84.119
144	10.5.84.120/29	10.5.84.121 – 10.5.84.126	10.5.84.127
145	10.5.84.128/29	10.5.84.129 – 10.5.84.134	10.5.84.135
146	10.5.84.136/29	10.5.84.137 – 10.5.84.142	10.5.84.143
147	10.5.84.144/29	10.5.84.145 – 10.5.84.150	10.5.84.151
148	10.5.84.152/29	10.5.84.153 – 10.5.84.158	10.5.84.159
149	10.5.84.160/29	10.5.84.161 – 10.5.84.166	10.5.84.167
150	10.5.84.168/29	10.5.84.169 – 10.5.84.174	10.5.84.175
151	10.5.84.176/29	10.5.84.177 – 10.5.84.182	10.5.84.183
152	10.5.84.184/29	10.5.84.185 – 10.5.84.190	10.5.84.191
153	10.5.84.192/29	10.5.84.193 – 10.5.84.198	10.5.84.199
154	10.5.84.200/29	10.5.84.201 – 10.5.84.206	10.5.84.207
155	10.5.84.208/29	10.5.84.209 – 10.5.84.214	10.5.84.215
156	10.5.84.216/29	10.5.84.217 – 10.5.84.222	10.5.84.223
157	10.5.84.224/29	10.5.84.225 – 10.5.84.230	10.5.84.231
158	10.5.84.232/29	10.5.84.233 – 10.5.84.238	10.5.84.239
159	10.5.84.240/29	10.5.84.241 – 10.5.84.246	10.5.84.247
160	10.5.84.248/29	10.5.84.249 – 10.5.84.254	10.5.84.255
161	10.5.85.0/29	10.5.85.1 – 10.5.85.6	10.5.85.7
162	10.5.85.8/29	10.5.85.9 – 10.5.85.14	10.5.85.15
163	10.5.85.16/29	10.5.85.17 – 10.5.85.22	10.5.85.23
164	10.5.85.24/29	10.5.85.25 – 10.5.85.30	10.5.85.31
165	10.5.85.32/29	10.5.85.33 – 10.5.85.38	10.5.85.39
166	10.5.85.40/29	10.5.85.41 – 10.5.85.46	10.5.85.47
167	10.5.85.48/29	10.5.85.49 – 10.5.85.54	10.5.85.55
168	10.5.85.56/29	10.5.85.57 – 10.5.85.62	10.5.85.63
169	10.5.85.64/29	10.5.85.65 – 10.5.85.70	10.5.85.71
170	10.5.85.72/29	10.5.85.73 – 10.5.85.78	10.5.85.79
171	10.5.85.80/29	10.5.85.81 – 10.5.85.86	10.5.85.87
172	10.5.85.88/29	10.5.85.89 – 10.5.85.94	10.5.85.95
173	10.5.85.96/29	10.5.85.97 – 10.5.85.102	10.5.85.103
174	10.5.85.104/29	10.5.85.105 – 10.5.85.110	10.5.85.111
175	10.5.85.112/29	10.5.85.113 – 10.5.85.118	10.5.85.119
176	10.5.85.120/29	10.5.85.121 – 10.5.85.126	10.5.85.127
177	10.5.85.128/29	10.5.85.129 – 10.5.85.134	10.5.85.135
178	10.5.85.136/29	10.5.85.137 – 10.5.85.142	10.5.85.143
179	10.5.85.144/29	10.5.85.145 – 10.5.85.150	10.5.85.151
180	10.5.85.152/29	10.5.85.153 – 10.5.85.158	10.5.85.159
181	10.5.85.160/29	10.5.85.161 – 10.5.85.166	10.5.85.167
182	10.5.85.168/29	10.5.85.169 – 10.5.85.174	10.5.85.175
183	10.5.85.176/29	10.5.85.177 – 10.5.85.182	10.5.85.183
184	10.5.85.184/29	10.5.85.185 – 10.5.85.190	10.5.85.191
185	10.5.85.192/29	10.5.85.193 – 10.5.85.198	10.5.85.199
186	10.5.85.200/29	10.5.85.201 – 10.5.85.206	10.5.85.207
187	10.5.85.208/29	10.5.85.209 – 10.5.85.214	10.5.85.215
188	10.5.85.216/29	10.5.85.217 – 10.5.85.222	10.5.85.223
189	10.5.85.224/29	10.5.85.225 – 10.5.85.230	10.5.85.231
190	10.5.85.232/29	10.5.85.233 – 10.5.85.238	10.5.85.239
191	10.5.85.240/29	10.5.85.241 – 10.5.85.246	10.5.85.247
192	10.5.85.248/29	10.5.85.249 – 10.5.85.254	10.5.85.255
193	10.5.86.0/29	10.5.86.1 – 10.5.86.6	10.5.86.7
194	10.5.86.8/29	10.5.86.9 – 10.5.86.14	10.5.86.15
195	10.5.86.16/29	10.5.86.17 – 10.5.86.22	10.5.86.23
196	10.5.86.24/29	10.5.86.25 – 10.5.86.30	10.5.86.31
197	10.5.86.32/29	10.5.86.33 – 10.5.86.38	10.5.86.39
198	10.5.86.40/29	10.5.86.41 – 10.5.86.46	10.5.86.47
199	10.5.86.48/29	10.5.86.49 – 10.5.86.54	10.5.86.55
200	10.5.86.56/29	10.5.86.57 – 10.5.86.62	10.5.86.63
201	10.5.86.64/29	10.5.86.65 – 10.5.86.70	10.5.86.71
202	10.5.86.72/29	10.5.86.73 – 10.5.86.78	10.5.86.79
203	10.5.86.80/29	10.5.86.81 – 10.5.86.86	10.5.86.87
204	10.5.86.88/29	10.5.86.89 – 10.5.86.94	10.5.86.95
205	10.5.86.96/29	10.5.86.97 – 10.5.86.102	10.5.86.103
206	10.5.86.104/29	10.5.86.105 – 10.5.86.110	10.5.86.111
207	10.5.86.112/29	10.5.86.113 – 10.5.86.118	10.5.86.119
208	10.5.86.120/29	10.5.86.121 – 10.5.86.126	10.5.86.127
209	10.5.86.128/29	10.5.86.129 – 10.5.86.134	10.5.86.135
210	10.5.86.136/29	10.5.86.137 – 10.5.86.142	10.5.86.143
211	10.5.86.144/29	10.5.86.145 – 10.5.86.150	10.5.86.151
212	10.5.86.152/29	10.5.86.153 – 10.5.86.158	10.5.86.159
213	10.5.86.160/29	10.5.86.161 – 10.5.86.166	10.5.86.167
214	10.5.86.168/29	10.5.86.169 – 10.5.86.174	10.5.86.175
215	10.5.86.176/29	10.5.86.177 – 10.5.86.182	10.5.86.183
216	10.5.86.184/29	10.5.86.185 – 10.5.86.190	10.5.86.191
217	10.5.86.192/29	10.5.86.193 – 10.5.86.198	10.5.86.199
218	10.5.86.200/29	10.5.86.201 – 10.5.86.206	10.5.86.207
219	10.5.86.208/29	10.5.86.209 – 10.5.86.214	10.5.86.215
220	10.5.86.216/29	10.5.86.217 – 10.5.86.222	10.5.86.223
221	10.5.86.224/29	10.5.86.225 – 10.5.86.230	10.5.86.231
222	10.5.86.232/29	10.5.86.233 – 10.5.86.238	10.5.86.239
223	10.5.86.240/29	10.5.86.241 – 10.5.86.246	10.5.86.247
224	10.5.86.248/29	10.5.86.249 – 10.5.86.254	10.5.86.255
225	10.5.87.0/29	10.5.87.1 – 10.5.87.6	10.5.87.7
226	10.5.87.8/29	10.5.87.9 – 10.5.87.14	10.5.87.15
227	10.5.87.16/29	10.5.87.17 – 10.5.87.22	10.5.87.23
228	10.5.87.24/29	10.5.87.25 – 10.5.87.30	10.5.87.31
229	10.5.87.32/29	10.5.87.33 – 10.5.87.38	10.5.87.39
230	10.5.87.40/29	10.5.87.41 – 10.5.87.46	10.5.87.47
231	10.5.87.48/29	10.5.87.49 – 10.5.87.54	10.5.87.55
232	10.5.87.56/29	10.5.87.57 – 10.5.87.62	10.5.87.63
233	10.5.87.64/29	10.5.87.65 – 10.5.87.70	10.5.87.71
234	10.5.87.72/29	10.5.87.73 – 10.5.87.78	10.5.87.79
235	10.5.87.80/29	10.5.87.81 – 10.5.87.86	10.5.87.87
236	10.5.87.88/29	10.5.87.89 – 10.5.87.94	10.5.87.95
237	10.5.87.96/29	10.5.87.97 – 10.5.87.102	10.5.87.103
238	10.5.87.104/29	10.5.87.105 – 10.5.87.110	10.5.87.111
239	10.5.87.112/29	10.5.87.113 – 10.5.87.118	10.5.87.119
240	10.5.87.120/29	10.5.87.121 – 10.5.87.126	10.5.87.127
241	10.5.87.128/29	10.5.87.129 – 10.5.87.134	10.5.87.135
242	10.5.87.136/29	10.5.87.137 – 10.5.87.142	10.5.87.143
243	10.5.87.144/29	10.5.87.145 – 10.5.87.150	10.5.87.151
244	10.5.87.152/29	10.5.87.153 – 10.5.87.158	10.5.87.159
245	10.5.87.160/29	10.5.87.161 – 10.5.87.166	10.5.87.167
246	10.5.87.168/29	10.5.87.169 – 10.5.87.174	10.5.87.175
247	10.5.87.176/29	10.5.87.177 – 10.5.87.182	10.5.87.183
248	10.5.87.184/29	10.5.87.185 – 10.5.87.190	10.5.87.191
249	10.5.87.192/29	10.5.87.193 – 10.5.87.198	10.5.87.199
250	10.5.87.200/29	10.5.87.201 – 10.5.87.206	10.5.87.207
251	10.5.87.208/29	10.5.87.209 – 10.5.87.214	10.5.87.215
252	10.5.87.216/29	10.5.87.217 – 10.5.87.222	10.5.87.223
253	10.5.87.224/29	10.5.87.225 – 10.5.87.230	10.5.87.231
254	10.5.87.232/29	10.5.87.233 – 10.5.87.238	10.5.87.239
255	10.5.87.240/29	10.5.87.241 – 10.5.87.246	10.5.87.247
256	10.5.87.248/29	10.5.87.249 – 10.5.87.254	10.5.87.255

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 →