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)10.5.112.0/21

network10.5.112.0/21

broadcast10.5.119.255

first host10.5.112.1

last host10.5.119.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.112.0/21

address00001010.00000101.01110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.01110000.00000000

broadcast00001010.00000101.01110111.11111111

green = network part, grey = host part

hex0x0a057000

decimal168128512

reverse dns0.112.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:7000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.5.112.0/29	10.5.112.1 – 10.5.112.6	10.5.112.7
2	10.5.112.8/29	10.5.112.9 – 10.5.112.14	10.5.112.15
3	10.5.112.16/29	10.5.112.17 – 10.5.112.22	10.5.112.23
4	10.5.112.24/29	10.5.112.25 – 10.5.112.30	10.5.112.31
5	10.5.112.32/29	10.5.112.33 – 10.5.112.38	10.5.112.39
6	10.5.112.40/29	10.5.112.41 – 10.5.112.46	10.5.112.47
7	10.5.112.48/29	10.5.112.49 – 10.5.112.54	10.5.112.55
8	10.5.112.56/29	10.5.112.57 – 10.5.112.62	10.5.112.63
9	10.5.112.64/29	10.5.112.65 – 10.5.112.70	10.5.112.71
10	10.5.112.72/29	10.5.112.73 – 10.5.112.78	10.5.112.79
11	10.5.112.80/29	10.5.112.81 – 10.5.112.86	10.5.112.87
12	10.5.112.88/29	10.5.112.89 – 10.5.112.94	10.5.112.95
13	10.5.112.96/29	10.5.112.97 – 10.5.112.102	10.5.112.103
14	10.5.112.104/29	10.5.112.105 – 10.5.112.110	10.5.112.111
15	10.5.112.112/29	10.5.112.113 – 10.5.112.118	10.5.112.119
16	10.5.112.120/29	10.5.112.121 – 10.5.112.126	10.5.112.127
17	10.5.112.128/29	10.5.112.129 – 10.5.112.134	10.5.112.135
18	10.5.112.136/29	10.5.112.137 – 10.5.112.142	10.5.112.143
19	10.5.112.144/29	10.5.112.145 – 10.5.112.150	10.5.112.151
20	10.5.112.152/29	10.5.112.153 – 10.5.112.158	10.5.112.159
21	10.5.112.160/29	10.5.112.161 – 10.5.112.166	10.5.112.167
22	10.5.112.168/29	10.5.112.169 – 10.5.112.174	10.5.112.175
23	10.5.112.176/29	10.5.112.177 – 10.5.112.182	10.5.112.183
24	10.5.112.184/29	10.5.112.185 – 10.5.112.190	10.5.112.191
25	10.5.112.192/29	10.5.112.193 – 10.5.112.198	10.5.112.199
26	10.5.112.200/29	10.5.112.201 – 10.5.112.206	10.5.112.207
27	10.5.112.208/29	10.5.112.209 – 10.5.112.214	10.5.112.215
28	10.5.112.216/29	10.5.112.217 – 10.5.112.222	10.5.112.223
29	10.5.112.224/29	10.5.112.225 – 10.5.112.230	10.5.112.231
30	10.5.112.232/29	10.5.112.233 – 10.5.112.238	10.5.112.239
31	10.5.112.240/29	10.5.112.241 – 10.5.112.246	10.5.112.247
32	10.5.112.248/29	10.5.112.249 – 10.5.112.254	10.5.112.255
33	10.5.113.0/29	10.5.113.1 – 10.5.113.6	10.5.113.7
34	10.5.113.8/29	10.5.113.9 – 10.5.113.14	10.5.113.15
35	10.5.113.16/29	10.5.113.17 – 10.5.113.22	10.5.113.23
36	10.5.113.24/29	10.5.113.25 – 10.5.113.30	10.5.113.31
37	10.5.113.32/29	10.5.113.33 – 10.5.113.38	10.5.113.39
38	10.5.113.40/29	10.5.113.41 – 10.5.113.46	10.5.113.47
39	10.5.113.48/29	10.5.113.49 – 10.5.113.54	10.5.113.55
40	10.5.113.56/29	10.5.113.57 – 10.5.113.62	10.5.113.63
41	10.5.113.64/29	10.5.113.65 – 10.5.113.70	10.5.113.71
42	10.5.113.72/29	10.5.113.73 – 10.5.113.78	10.5.113.79
43	10.5.113.80/29	10.5.113.81 – 10.5.113.86	10.5.113.87
44	10.5.113.88/29	10.5.113.89 – 10.5.113.94	10.5.113.95
45	10.5.113.96/29	10.5.113.97 – 10.5.113.102	10.5.113.103
46	10.5.113.104/29	10.5.113.105 – 10.5.113.110	10.5.113.111
47	10.5.113.112/29	10.5.113.113 – 10.5.113.118	10.5.113.119
48	10.5.113.120/29	10.5.113.121 – 10.5.113.126	10.5.113.127
49	10.5.113.128/29	10.5.113.129 – 10.5.113.134	10.5.113.135
50	10.5.113.136/29	10.5.113.137 – 10.5.113.142	10.5.113.143
51	10.5.113.144/29	10.5.113.145 – 10.5.113.150	10.5.113.151
52	10.5.113.152/29	10.5.113.153 – 10.5.113.158	10.5.113.159
53	10.5.113.160/29	10.5.113.161 – 10.5.113.166	10.5.113.167
54	10.5.113.168/29	10.5.113.169 – 10.5.113.174	10.5.113.175
55	10.5.113.176/29	10.5.113.177 – 10.5.113.182	10.5.113.183
56	10.5.113.184/29	10.5.113.185 – 10.5.113.190	10.5.113.191
57	10.5.113.192/29	10.5.113.193 – 10.5.113.198	10.5.113.199
58	10.5.113.200/29	10.5.113.201 – 10.5.113.206	10.5.113.207
59	10.5.113.208/29	10.5.113.209 – 10.5.113.214	10.5.113.215
60	10.5.113.216/29	10.5.113.217 – 10.5.113.222	10.5.113.223
61	10.5.113.224/29	10.5.113.225 – 10.5.113.230	10.5.113.231
62	10.5.113.232/29	10.5.113.233 – 10.5.113.238	10.5.113.239
63	10.5.113.240/29	10.5.113.241 – 10.5.113.246	10.5.113.247
64	10.5.113.248/29	10.5.113.249 – 10.5.113.254	10.5.113.255
65	10.5.114.0/29	10.5.114.1 – 10.5.114.6	10.5.114.7
66	10.5.114.8/29	10.5.114.9 – 10.5.114.14	10.5.114.15
67	10.5.114.16/29	10.5.114.17 – 10.5.114.22	10.5.114.23
68	10.5.114.24/29	10.5.114.25 – 10.5.114.30	10.5.114.31
69	10.5.114.32/29	10.5.114.33 – 10.5.114.38	10.5.114.39
70	10.5.114.40/29	10.5.114.41 – 10.5.114.46	10.5.114.47
71	10.5.114.48/29	10.5.114.49 – 10.5.114.54	10.5.114.55
72	10.5.114.56/29	10.5.114.57 – 10.5.114.62	10.5.114.63
73	10.5.114.64/29	10.5.114.65 – 10.5.114.70	10.5.114.71
74	10.5.114.72/29	10.5.114.73 – 10.5.114.78	10.5.114.79
75	10.5.114.80/29	10.5.114.81 – 10.5.114.86	10.5.114.87
76	10.5.114.88/29	10.5.114.89 – 10.5.114.94	10.5.114.95
77	10.5.114.96/29	10.5.114.97 – 10.5.114.102	10.5.114.103
78	10.5.114.104/29	10.5.114.105 – 10.5.114.110	10.5.114.111
79	10.5.114.112/29	10.5.114.113 – 10.5.114.118	10.5.114.119
80	10.5.114.120/29	10.5.114.121 – 10.5.114.126	10.5.114.127
81	10.5.114.128/29	10.5.114.129 – 10.5.114.134	10.5.114.135
82	10.5.114.136/29	10.5.114.137 – 10.5.114.142	10.5.114.143
83	10.5.114.144/29	10.5.114.145 – 10.5.114.150	10.5.114.151
84	10.5.114.152/29	10.5.114.153 – 10.5.114.158	10.5.114.159
85	10.5.114.160/29	10.5.114.161 – 10.5.114.166	10.5.114.167
86	10.5.114.168/29	10.5.114.169 – 10.5.114.174	10.5.114.175
87	10.5.114.176/29	10.5.114.177 – 10.5.114.182	10.5.114.183
88	10.5.114.184/29	10.5.114.185 – 10.5.114.190	10.5.114.191
89	10.5.114.192/29	10.5.114.193 – 10.5.114.198	10.5.114.199
90	10.5.114.200/29	10.5.114.201 – 10.5.114.206	10.5.114.207
91	10.5.114.208/29	10.5.114.209 – 10.5.114.214	10.5.114.215
92	10.5.114.216/29	10.5.114.217 – 10.5.114.222	10.5.114.223
93	10.5.114.224/29	10.5.114.225 – 10.5.114.230	10.5.114.231
94	10.5.114.232/29	10.5.114.233 – 10.5.114.238	10.5.114.239
95	10.5.114.240/29	10.5.114.241 – 10.5.114.246	10.5.114.247
96	10.5.114.248/29	10.5.114.249 – 10.5.114.254	10.5.114.255
97	10.5.115.0/29	10.5.115.1 – 10.5.115.6	10.5.115.7
98	10.5.115.8/29	10.5.115.9 – 10.5.115.14	10.5.115.15
99	10.5.115.16/29	10.5.115.17 – 10.5.115.22	10.5.115.23
100	10.5.115.24/29	10.5.115.25 – 10.5.115.30	10.5.115.31
101	10.5.115.32/29	10.5.115.33 – 10.5.115.38	10.5.115.39
102	10.5.115.40/29	10.5.115.41 – 10.5.115.46	10.5.115.47
103	10.5.115.48/29	10.5.115.49 – 10.5.115.54	10.5.115.55
104	10.5.115.56/29	10.5.115.57 – 10.5.115.62	10.5.115.63
105	10.5.115.64/29	10.5.115.65 – 10.5.115.70	10.5.115.71
106	10.5.115.72/29	10.5.115.73 – 10.5.115.78	10.5.115.79
107	10.5.115.80/29	10.5.115.81 – 10.5.115.86	10.5.115.87
108	10.5.115.88/29	10.5.115.89 – 10.5.115.94	10.5.115.95
109	10.5.115.96/29	10.5.115.97 – 10.5.115.102	10.5.115.103
110	10.5.115.104/29	10.5.115.105 – 10.5.115.110	10.5.115.111
111	10.5.115.112/29	10.5.115.113 – 10.5.115.118	10.5.115.119
112	10.5.115.120/29	10.5.115.121 – 10.5.115.126	10.5.115.127
113	10.5.115.128/29	10.5.115.129 – 10.5.115.134	10.5.115.135
114	10.5.115.136/29	10.5.115.137 – 10.5.115.142	10.5.115.143
115	10.5.115.144/29	10.5.115.145 – 10.5.115.150	10.5.115.151
116	10.5.115.152/29	10.5.115.153 – 10.5.115.158	10.5.115.159
117	10.5.115.160/29	10.5.115.161 – 10.5.115.166	10.5.115.167
118	10.5.115.168/29	10.5.115.169 – 10.5.115.174	10.5.115.175
119	10.5.115.176/29	10.5.115.177 – 10.5.115.182	10.5.115.183
120	10.5.115.184/29	10.5.115.185 – 10.5.115.190	10.5.115.191
121	10.5.115.192/29	10.5.115.193 – 10.5.115.198	10.5.115.199
122	10.5.115.200/29	10.5.115.201 – 10.5.115.206	10.5.115.207
123	10.5.115.208/29	10.5.115.209 – 10.5.115.214	10.5.115.215
124	10.5.115.216/29	10.5.115.217 – 10.5.115.222	10.5.115.223
125	10.5.115.224/29	10.5.115.225 – 10.5.115.230	10.5.115.231
126	10.5.115.232/29	10.5.115.233 – 10.5.115.238	10.5.115.239
127	10.5.115.240/29	10.5.115.241 – 10.5.115.246	10.5.115.247
128	10.5.115.248/29	10.5.115.249 – 10.5.115.254	10.5.115.255
129	10.5.116.0/29	10.5.116.1 – 10.5.116.6	10.5.116.7
130	10.5.116.8/29	10.5.116.9 – 10.5.116.14	10.5.116.15
131	10.5.116.16/29	10.5.116.17 – 10.5.116.22	10.5.116.23
132	10.5.116.24/29	10.5.116.25 – 10.5.116.30	10.5.116.31
133	10.5.116.32/29	10.5.116.33 – 10.5.116.38	10.5.116.39
134	10.5.116.40/29	10.5.116.41 – 10.5.116.46	10.5.116.47
135	10.5.116.48/29	10.5.116.49 – 10.5.116.54	10.5.116.55
136	10.5.116.56/29	10.5.116.57 – 10.5.116.62	10.5.116.63
137	10.5.116.64/29	10.5.116.65 – 10.5.116.70	10.5.116.71
138	10.5.116.72/29	10.5.116.73 – 10.5.116.78	10.5.116.79
139	10.5.116.80/29	10.5.116.81 – 10.5.116.86	10.5.116.87
140	10.5.116.88/29	10.5.116.89 – 10.5.116.94	10.5.116.95
141	10.5.116.96/29	10.5.116.97 – 10.5.116.102	10.5.116.103
142	10.5.116.104/29	10.5.116.105 – 10.5.116.110	10.5.116.111
143	10.5.116.112/29	10.5.116.113 – 10.5.116.118	10.5.116.119
144	10.5.116.120/29	10.5.116.121 – 10.5.116.126	10.5.116.127
145	10.5.116.128/29	10.5.116.129 – 10.5.116.134	10.5.116.135
146	10.5.116.136/29	10.5.116.137 – 10.5.116.142	10.5.116.143
147	10.5.116.144/29	10.5.116.145 – 10.5.116.150	10.5.116.151
148	10.5.116.152/29	10.5.116.153 – 10.5.116.158	10.5.116.159
149	10.5.116.160/29	10.5.116.161 – 10.5.116.166	10.5.116.167
150	10.5.116.168/29	10.5.116.169 – 10.5.116.174	10.5.116.175
151	10.5.116.176/29	10.5.116.177 – 10.5.116.182	10.5.116.183
152	10.5.116.184/29	10.5.116.185 – 10.5.116.190	10.5.116.191
153	10.5.116.192/29	10.5.116.193 – 10.5.116.198	10.5.116.199
154	10.5.116.200/29	10.5.116.201 – 10.5.116.206	10.5.116.207
155	10.5.116.208/29	10.5.116.209 – 10.5.116.214	10.5.116.215
156	10.5.116.216/29	10.5.116.217 – 10.5.116.222	10.5.116.223
157	10.5.116.224/29	10.5.116.225 – 10.5.116.230	10.5.116.231
158	10.5.116.232/29	10.5.116.233 – 10.5.116.238	10.5.116.239
159	10.5.116.240/29	10.5.116.241 – 10.5.116.246	10.5.116.247
160	10.5.116.248/29	10.5.116.249 – 10.5.116.254	10.5.116.255
161	10.5.117.0/29	10.5.117.1 – 10.5.117.6	10.5.117.7
162	10.5.117.8/29	10.5.117.9 – 10.5.117.14	10.5.117.15
163	10.5.117.16/29	10.5.117.17 – 10.5.117.22	10.5.117.23
164	10.5.117.24/29	10.5.117.25 – 10.5.117.30	10.5.117.31
165	10.5.117.32/29	10.5.117.33 – 10.5.117.38	10.5.117.39
166	10.5.117.40/29	10.5.117.41 – 10.5.117.46	10.5.117.47
167	10.5.117.48/29	10.5.117.49 – 10.5.117.54	10.5.117.55
168	10.5.117.56/29	10.5.117.57 – 10.5.117.62	10.5.117.63
169	10.5.117.64/29	10.5.117.65 – 10.5.117.70	10.5.117.71
170	10.5.117.72/29	10.5.117.73 – 10.5.117.78	10.5.117.79
171	10.5.117.80/29	10.5.117.81 – 10.5.117.86	10.5.117.87
172	10.5.117.88/29	10.5.117.89 – 10.5.117.94	10.5.117.95
173	10.5.117.96/29	10.5.117.97 – 10.5.117.102	10.5.117.103
174	10.5.117.104/29	10.5.117.105 – 10.5.117.110	10.5.117.111
175	10.5.117.112/29	10.5.117.113 – 10.5.117.118	10.5.117.119
176	10.5.117.120/29	10.5.117.121 – 10.5.117.126	10.5.117.127
177	10.5.117.128/29	10.5.117.129 – 10.5.117.134	10.5.117.135
178	10.5.117.136/29	10.5.117.137 – 10.5.117.142	10.5.117.143
179	10.5.117.144/29	10.5.117.145 – 10.5.117.150	10.5.117.151
180	10.5.117.152/29	10.5.117.153 – 10.5.117.158	10.5.117.159
181	10.5.117.160/29	10.5.117.161 – 10.5.117.166	10.5.117.167
182	10.5.117.168/29	10.5.117.169 – 10.5.117.174	10.5.117.175
183	10.5.117.176/29	10.5.117.177 – 10.5.117.182	10.5.117.183
184	10.5.117.184/29	10.5.117.185 – 10.5.117.190	10.5.117.191
185	10.5.117.192/29	10.5.117.193 – 10.5.117.198	10.5.117.199
186	10.5.117.200/29	10.5.117.201 – 10.5.117.206	10.5.117.207
187	10.5.117.208/29	10.5.117.209 – 10.5.117.214	10.5.117.215
188	10.5.117.216/29	10.5.117.217 – 10.5.117.222	10.5.117.223
189	10.5.117.224/29	10.5.117.225 – 10.5.117.230	10.5.117.231
190	10.5.117.232/29	10.5.117.233 – 10.5.117.238	10.5.117.239
191	10.5.117.240/29	10.5.117.241 – 10.5.117.246	10.5.117.247
192	10.5.117.248/29	10.5.117.249 – 10.5.117.254	10.5.117.255
193	10.5.118.0/29	10.5.118.1 – 10.5.118.6	10.5.118.7
194	10.5.118.8/29	10.5.118.9 – 10.5.118.14	10.5.118.15
195	10.5.118.16/29	10.5.118.17 – 10.5.118.22	10.5.118.23
196	10.5.118.24/29	10.5.118.25 – 10.5.118.30	10.5.118.31
197	10.5.118.32/29	10.5.118.33 – 10.5.118.38	10.5.118.39
198	10.5.118.40/29	10.5.118.41 – 10.5.118.46	10.5.118.47
199	10.5.118.48/29	10.5.118.49 – 10.5.118.54	10.5.118.55
200	10.5.118.56/29	10.5.118.57 – 10.5.118.62	10.5.118.63
201	10.5.118.64/29	10.5.118.65 – 10.5.118.70	10.5.118.71
202	10.5.118.72/29	10.5.118.73 – 10.5.118.78	10.5.118.79
203	10.5.118.80/29	10.5.118.81 – 10.5.118.86	10.5.118.87
204	10.5.118.88/29	10.5.118.89 – 10.5.118.94	10.5.118.95
205	10.5.118.96/29	10.5.118.97 – 10.5.118.102	10.5.118.103
206	10.5.118.104/29	10.5.118.105 – 10.5.118.110	10.5.118.111
207	10.5.118.112/29	10.5.118.113 – 10.5.118.118	10.5.118.119
208	10.5.118.120/29	10.5.118.121 – 10.5.118.126	10.5.118.127
209	10.5.118.128/29	10.5.118.129 – 10.5.118.134	10.5.118.135
210	10.5.118.136/29	10.5.118.137 – 10.5.118.142	10.5.118.143
211	10.5.118.144/29	10.5.118.145 – 10.5.118.150	10.5.118.151
212	10.5.118.152/29	10.5.118.153 – 10.5.118.158	10.5.118.159
213	10.5.118.160/29	10.5.118.161 – 10.5.118.166	10.5.118.167
214	10.5.118.168/29	10.5.118.169 – 10.5.118.174	10.5.118.175
215	10.5.118.176/29	10.5.118.177 – 10.5.118.182	10.5.118.183
216	10.5.118.184/29	10.5.118.185 – 10.5.118.190	10.5.118.191
217	10.5.118.192/29	10.5.118.193 – 10.5.118.198	10.5.118.199
218	10.5.118.200/29	10.5.118.201 – 10.5.118.206	10.5.118.207
219	10.5.118.208/29	10.5.118.209 – 10.5.118.214	10.5.118.215
220	10.5.118.216/29	10.5.118.217 – 10.5.118.222	10.5.118.223
221	10.5.118.224/29	10.5.118.225 – 10.5.118.230	10.5.118.231
222	10.5.118.232/29	10.5.118.233 – 10.5.118.238	10.5.118.239
223	10.5.118.240/29	10.5.118.241 – 10.5.118.246	10.5.118.247
224	10.5.118.248/29	10.5.118.249 – 10.5.118.254	10.5.118.255
225	10.5.119.0/29	10.5.119.1 – 10.5.119.6	10.5.119.7
226	10.5.119.8/29	10.5.119.9 – 10.5.119.14	10.5.119.15
227	10.5.119.16/29	10.5.119.17 – 10.5.119.22	10.5.119.23
228	10.5.119.24/29	10.5.119.25 – 10.5.119.30	10.5.119.31
229	10.5.119.32/29	10.5.119.33 – 10.5.119.38	10.5.119.39
230	10.5.119.40/29	10.5.119.41 – 10.5.119.46	10.5.119.47
231	10.5.119.48/29	10.5.119.49 – 10.5.119.54	10.5.119.55
232	10.5.119.56/29	10.5.119.57 – 10.5.119.62	10.5.119.63
233	10.5.119.64/29	10.5.119.65 – 10.5.119.70	10.5.119.71
234	10.5.119.72/29	10.5.119.73 – 10.5.119.78	10.5.119.79
235	10.5.119.80/29	10.5.119.81 – 10.5.119.86	10.5.119.87
236	10.5.119.88/29	10.5.119.89 – 10.5.119.94	10.5.119.95
237	10.5.119.96/29	10.5.119.97 – 10.5.119.102	10.5.119.103
238	10.5.119.104/29	10.5.119.105 – 10.5.119.110	10.5.119.111
239	10.5.119.112/29	10.5.119.113 – 10.5.119.118	10.5.119.119
240	10.5.119.120/29	10.5.119.121 – 10.5.119.126	10.5.119.127
241	10.5.119.128/29	10.5.119.129 – 10.5.119.134	10.5.119.135
242	10.5.119.136/29	10.5.119.137 – 10.5.119.142	10.5.119.143
243	10.5.119.144/29	10.5.119.145 – 10.5.119.150	10.5.119.151
244	10.5.119.152/29	10.5.119.153 – 10.5.119.158	10.5.119.159
245	10.5.119.160/29	10.5.119.161 – 10.5.119.166	10.5.119.167
246	10.5.119.168/29	10.5.119.169 – 10.5.119.174	10.5.119.175
247	10.5.119.176/29	10.5.119.177 – 10.5.119.182	10.5.119.183
248	10.5.119.184/29	10.5.119.185 – 10.5.119.190	10.5.119.191
249	10.5.119.192/29	10.5.119.193 – 10.5.119.198	10.5.119.199
250	10.5.119.200/29	10.5.119.201 – 10.5.119.206	10.5.119.207
251	10.5.119.208/29	10.5.119.209 – 10.5.119.214	10.5.119.215
252	10.5.119.216/29	10.5.119.217 – 10.5.119.222	10.5.119.223
253	10.5.119.224/29	10.5.119.225 – 10.5.119.230	10.5.119.231
254	10.5.119.232/29	10.5.119.233 – 10.5.119.238	10.5.119.239
255	10.5.119.240/29	10.5.119.241 – 10.5.119.246	10.5.119.247
256	10.5.119.248/29	10.5.119.249 – 10.5.119.254	10.5.119.255

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 →