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)10.0.144.0/21

network10.0.144.0/21

broadcast10.0.151.255

first host10.0.144.1

last host10.0.151.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.144.0/21

address00001010.00000000.10010000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.10010000.00000000

broadcast00001010.00000000.10010111.11111111

green = network part, grey = host part

hex0x0a009000

decimal167809024

reverse dns0.144.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:9000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.144.0/29	10.0.144.1 – 10.0.144.6	10.0.144.7
2	10.0.144.8/29	10.0.144.9 – 10.0.144.14	10.0.144.15
3	10.0.144.16/29	10.0.144.17 – 10.0.144.22	10.0.144.23
4	10.0.144.24/29	10.0.144.25 – 10.0.144.30	10.0.144.31
5	10.0.144.32/29	10.0.144.33 – 10.0.144.38	10.0.144.39
6	10.0.144.40/29	10.0.144.41 – 10.0.144.46	10.0.144.47
7	10.0.144.48/29	10.0.144.49 – 10.0.144.54	10.0.144.55
8	10.0.144.56/29	10.0.144.57 – 10.0.144.62	10.0.144.63
9	10.0.144.64/29	10.0.144.65 – 10.0.144.70	10.0.144.71
10	10.0.144.72/29	10.0.144.73 – 10.0.144.78	10.0.144.79
11	10.0.144.80/29	10.0.144.81 – 10.0.144.86	10.0.144.87
12	10.0.144.88/29	10.0.144.89 – 10.0.144.94	10.0.144.95
13	10.0.144.96/29	10.0.144.97 – 10.0.144.102	10.0.144.103
14	10.0.144.104/29	10.0.144.105 – 10.0.144.110	10.0.144.111
15	10.0.144.112/29	10.0.144.113 – 10.0.144.118	10.0.144.119
16	10.0.144.120/29	10.0.144.121 – 10.0.144.126	10.0.144.127
17	10.0.144.128/29	10.0.144.129 – 10.0.144.134	10.0.144.135
18	10.0.144.136/29	10.0.144.137 – 10.0.144.142	10.0.144.143
19	10.0.144.144/29	10.0.144.145 – 10.0.144.150	10.0.144.151
20	10.0.144.152/29	10.0.144.153 – 10.0.144.158	10.0.144.159
21	10.0.144.160/29	10.0.144.161 – 10.0.144.166	10.0.144.167
22	10.0.144.168/29	10.0.144.169 – 10.0.144.174	10.0.144.175
23	10.0.144.176/29	10.0.144.177 – 10.0.144.182	10.0.144.183
24	10.0.144.184/29	10.0.144.185 – 10.0.144.190	10.0.144.191
25	10.0.144.192/29	10.0.144.193 – 10.0.144.198	10.0.144.199
26	10.0.144.200/29	10.0.144.201 – 10.0.144.206	10.0.144.207
27	10.0.144.208/29	10.0.144.209 – 10.0.144.214	10.0.144.215
28	10.0.144.216/29	10.0.144.217 – 10.0.144.222	10.0.144.223
29	10.0.144.224/29	10.0.144.225 – 10.0.144.230	10.0.144.231
30	10.0.144.232/29	10.0.144.233 – 10.0.144.238	10.0.144.239
31	10.0.144.240/29	10.0.144.241 – 10.0.144.246	10.0.144.247
32	10.0.144.248/29	10.0.144.249 – 10.0.144.254	10.0.144.255
33	10.0.145.0/29	10.0.145.1 – 10.0.145.6	10.0.145.7
34	10.0.145.8/29	10.0.145.9 – 10.0.145.14	10.0.145.15
35	10.0.145.16/29	10.0.145.17 – 10.0.145.22	10.0.145.23
36	10.0.145.24/29	10.0.145.25 – 10.0.145.30	10.0.145.31
37	10.0.145.32/29	10.0.145.33 – 10.0.145.38	10.0.145.39
38	10.0.145.40/29	10.0.145.41 – 10.0.145.46	10.0.145.47
39	10.0.145.48/29	10.0.145.49 – 10.0.145.54	10.0.145.55
40	10.0.145.56/29	10.0.145.57 – 10.0.145.62	10.0.145.63
41	10.0.145.64/29	10.0.145.65 – 10.0.145.70	10.0.145.71
42	10.0.145.72/29	10.0.145.73 – 10.0.145.78	10.0.145.79
43	10.0.145.80/29	10.0.145.81 – 10.0.145.86	10.0.145.87
44	10.0.145.88/29	10.0.145.89 – 10.0.145.94	10.0.145.95
45	10.0.145.96/29	10.0.145.97 – 10.0.145.102	10.0.145.103
46	10.0.145.104/29	10.0.145.105 – 10.0.145.110	10.0.145.111
47	10.0.145.112/29	10.0.145.113 – 10.0.145.118	10.0.145.119
48	10.0.145.120/29	10.0.145.121 – 10.0.145.126	10.0.145.127
49	10.0.145.128/29	10.0.145.129 – 10.0.145.134	10.0.145.135
50	10.0.145.136/29	10.0.145.137 – 10.0.145.142	10.0.145.143
51	10.0.145.144/29	10.0.145.145 – 10.0.145.150	10.0.145.151
52	10.0.145.152/29	10.0.145.153 – 10.0.145.158	10.0.145.159
53	10.0.145.160/29	10.0.145.161 – 10.0.145.166	10.0.145.167
54	10.0.145.168/29	10.0.145.169 – 10.0.145.174	10.0.145.175
55	10.0.145.176/29	10.0.145.177 – 10.0.145.182	10.0.145.183
56	10.0.145.184/29	10.0.145.185 – 10.0.145.190	10.0.145.191
57	10.0.145.192/29	10.0.145.193 – 10.0.145.198	10.0.145.199
58	10.0.145.200/29	10.0.145.201 – 10.0.145.206	10.0.145.207
59	10.0.145.208/29	10.0.145.209 – 10.0.145.214	10.0.145.215
60	10.0.145.216/29	10.0.145.217 – 10.0.145.222	10.0.145.223
61	10.0.145.224/29	10.0.145.225 – 10.0.145.230	10.0.145.231
62	10.0.145.232/29	10.0.145.233 – 10.0.145.238	10.0.145.239
63	10.0.145.240/29	10.0.145.241 – 10.0.145.246	10.0.145.247
64	10.0.145.248/29	10.0.145.249 – 10.0.145.254	10.0.145.255
65	10.0.146.0/29	10.0.146.1 – 10.0.146.6	10.0.146.7
66	10.0.146.8/29	10.0.146.9 – 10.0.146.14	10.0.146.15
67	10.0.146.16/29	10.0.146.17 – 10.0.146.22	10.0.146.23
68	10.0.146.24/29	10.0.146.25 – 10.0.146.30	10.0.146.31
69	10.0.146.32/29	10.0.146.33 – 10.0.146.38	10.0.146.39
70	10.0.146.40/29	10.0.146.41 – 10.0.146.46	10.0.146.47
71	10.0.146.48/29	10.0.146.49 – 10.0.146.54	10.0.146.55
72	10.0.146.56/29	10.0.146.57 – 10.0.146.62	10.0.146.63
73	10.0.146.64/29	10.0.146.65 – 10.0.146.70	10.0.146.71
74	10.0.146.72/29	10.0.146.73 – 10.0.146.78	10.0.146.79
75	10.0.146.80/29	10.0.146.81 – 10.0.146.86	10.0.146.87
76	10.0.146.88/29	10.0.146.89 – 10.0.146.94	10.0.146.95
77	10.0.146.96/29	10.0.146.97 – 10.0.146.102	10.0.146.103
78	10.0.146.104/29	10.0.146.105 – 10.0.146.110	10.0.146.111
79	10.0.146.112/29	10.0.146.113 – 10.0.146.118	10.0.146.119
80	10.0.146.120/29	10.0.146.121 – 10.0.146.126	10.0.146.127
81	10.0.146.128/29	10.0.146.129 – 10.0.146.134	10.0.146.135
82	10.0.146.136/29	10.0.146.137 – 10.0.146.142	10.0.146.143
83	10.0.146.144/29	10.0.146.145 – 10.0.146.150	10.0.146.151
84	10.0.146.152/29	10.0.146.153 – 10.0.146.158	10.0.146.159
85	10.0.146.160/29	10.0.146.161 – 10.0.146.166	10.0.146.167
86	10.0.146.168/29	10.0.146.169 – 10.0.146.174	10.0.146.175
87	10.0.146.176/29	10.0.146.177 – 10.0.146.182	10.0.146.183
88	10.0.146.184/29	10.0.146.185 – 10.0.146.190	10.0.146.191
89	10.0.146.192/29	10.0.146.193 – 10.0.146.198	10.0.146.199
90	10.0.146.200/29	10.0.146.201 – 10.0.146.206	10.0.146.207
91	10.0.146.208/29	10.0.146.209 – 10.0.146.214	10.0.146.215
92	10.0.146.216/29	10.0.146.217 – 10.0.146.222	10.0.146.223
93	10.0.146.224/29	10.0.146.225 – 10.0.146.230	10.0.146.231
94	10.0.146.232/29	10.0.146.233 – 10.0.146.238	10.0.146.239
95	10.0.146.240/29	10.0.146.241 – 10.0.146.246	10.0.146.247
96	10.0.146.248/29	10.0.146.249 – 10.0.146.254	10.0.146.255
97	10.0.147.0/29	10.0.147.1 – 10.0.147.6	10.0.147.7
98	10.0.147.8/29	10.0.147.9 – 10.0.147.14	10.0.147.15
99	10.0.147.16/29	10.0.147.17 – 10.0.147.22	10.0.147.23
100	10.0.147.24/29	10.0.147.25 – 10.0.147.30	10.0.147.31
101	10.0.147.32/29	10.0.147.33 – 10.0.147.38	10.0.147.39
102	10.0.147.40/29	10.0.147.41 – 10.0.147.46	10.0.147.47
103	10.0.147.48/29	10.0.147.49 – 10.0.147.54	10.0.147.55
104	10.0.147.56/29	10.0.147.57 – 10.0.147.62	10.0.147.63
105	10.0.147.64/29	10.0.147.65 – 10.0.147.70	10.0.147.71
106	10.0.147.72/29	10.0.147.73 – 10.0.147.78	10.0.147.79
107	10.0.147.80/29	10.0.147.81 – 10.0.147.86	10.0.147.87
108	10.0.147.88/29	10.0.147.89 – 10.0.147.94	10.0.147.95
109	10.0.147.96/29	10.0.147.97 – 10.0.147.102	10.0.147.103
110	10.0.147.104/29	10.0.147.105 – 10.0.147.110	10.0.147.111
111	10.0.147.112/29	10.0.147.113 – 10.0.147.118	10.0.147.119
112	10.0.147.120/29	10.0.147.121 – 10.0.147.126	10.0.147.127
113	10.0.147.128/29	10.0.147.129 – 10.0.147.134	10.0.147.135
114	10.0.147.136/29	10.0.147.137 – 10.0.147.142	10.0.147.143
115	10.0.147.144/29	10.0.147.145 – 10.0.147.150	10.0.147.151
116	10.0.147.152/29	10.0.147.153 – 10.0.147.158	10.0.147.159
117	10.0.147.160/29	10.0.147.161 – 10.0.147.166	10.0.147.167
118	10.0.147.168/29	10.0.147.169 – 10.0.147.174	10.0.147.175
119	10.0.147.176/29	10.0.147.177 – 10.0.147.182	10.0.147.183
120	10.0.147.184/29	10.0.147.185 – 10.0.147.190	10.0.147.191
121	10.0.147.192/29	10.0.147.193 – 10.0.147.198	10.0.147.199
122	10.0.147.200/29	10.0.147.201 – 10.0.147.206	10.0.147.207
123	10.0.147.208/29	10.0.147.209 – 10.0.147.214	10.0.147.215
124	10.0.147.216/29	10.0.147.217 – 10.0.147.222	10.0.147.223
125	10.0.147.224/29	10.0.147.225 – 10.0.147.230	10.0.147.231
126	10.0.147.232/29	10.0.147.233 – 10.0.147.238	10.0.147.239
127	10.0.147.240/29	10.0.147.241 – 10.0.147.246	10.0.147.247
128	10.0.147.248/29	10.0.147.249 – 10.0.147.254	10.0.147.255
129	10.0.148.0/29	10.0.148.1 – 10.0.148.6	10.0.148.7
130	10.0.148.8/29	10.0.148.9 – 10.0.148.14	10.0.148.15
131	10.0.148.16/29	10.0.148.17 – 10.0.148.22	10.0.148.23
132	10.0.148.24/29	10.0.148.25 – 10.0.148.30	10.0.148.31
133	10.0.148.32/29	10.0.148.33 – 10.0.148.38	10.0.148.39
134	10.0.148.40/29	10.0.148.41 – 10.0.148.46	10.0.148.47
135	10.0.148.48/29	10.0.148.49 – 10.0.148.54	10.0.148.55
136	10.0.148.56/29	10.0.148.57 – 10.0.148.62	10.0.148.63
137	10.0.148.64/29	10.0.148.65 – 10.0.148.70	10.0.148.71
138	10.0.148.72/29	10.0.148.73 – 10.0.148.78	10.0.148.79
139	10.0.148.80/29	10.0.148.81 – 10.0.148.86	10.0.148.87
140	10.0.148.88/29	10.0.148.89 – 10.0.148.94	10.0.148.95
141	10.0.148.96/29	10.0.148.97 – 10.0.148.102	10.0.148.103
142	10.0.148.104/29	10.0.148.105 – 10.0.148.110	10.0.148.111
143	10.0.148.112/29	10.0.148.113 – 10.0.148.118	10.0.148.119
144	10.0.148.120/29	10.0.148.121 – 10.0.148.126	10.0.148.127
145	10.0.148.128/29	10.0.148.129 – 10.0.148.134	10.0.148.135
146	10.0.148.136/29	10.0.148.137 – 10.0.148.142	10.0.148.143
147	10.0.148.144/29	10.0.148.145 – 10.0.148.150	10.0.148.151
148	10.0.148.152/29	10.0.148.153 – 10.0.148.158	10.0.148.159
149	10.0.148.160/29	10.0.148.161 – 10.0.148.166	10.0.148.167
150	10.0.148.168/29	10.0.148.169 – 10.0.148.174	10.0.148.175
151	10.0.148.176/29	10.0.148.177 – 10.0.148.182	10.0.148.183
152	10.0.148.184/29	10.0.148.185 – 10.0.148.190	10.0.148.191
153	10.0.148.192/29	10.0.148.193 – 10.0.148.198	10.0.148.199
154	10.0.148.200/29	10.0.148.201 – 10.0.148.206	10.0.148.207
155	10.0.148.208/29	10.0.148.209 – 10.0.148.214	10.0.148.215
156	10.0.148.216/29	10.0.148.217 – 10.0.148.222	10.0.148.223
157	10.0.148.224/29	10.0.148.225 – 10.0.148.230	10.0.148.231
158	10.0.148.232/29	10.0.148.233 – 10.0.148.238	10.0.148.239
159	10.0.148.240/29	10.0.148.241 – 10.0.148.246	10.0.148.247
160	10.0.148.248/29	10.0.148.249 – 10.0.148.254	10.0.148.255
161	10.0.149.0/29	10.0.149.1 – 10.0.149.6	10.0.149.7
162	10.0.149.8/29	10.0.149.9 – 10.0.149.14	10.0.149.15
163	10.0.149.16/29	10.0.149.17 – 10.0.149.22	10.0.149.23
164	10.0.149.24/29	10.0.149.25 – 10.0.149.30	10.0.149.31
165	10.0.149.32/29	10.0.149.33 – 10.0.149.38	10.0.149.39
166	10.0.149.40/29	10.0.149.41 – 10.0.149.46	10.0.149.47
167	10.0.149.48/29	10.0.149.49 – 10.0.149.54	10.0.149.55
168	10.0.149.56/29	10.0.149.57 – 10.0.149.62	10.0.149.63
169	10.0.149.64/29	10.0.149.65 – 10.0.149.70	10.0.149.71
170	10.0.149.72/29	10.0.149.73 – 10.0.149.78	10.0.149.79
171	10.0.149.80/29	10.0.149.81 – 10.0.149.86	10.0.149.87
172	10.0.149.88/29	10.0.149.89 – 10.0.149.94	10.0.149.95
173	10.0.149.96/29	10.0.149.97 – 10.0.149.102	10.0.149.103
174	10.0.149.104/29	10.0.149.105 – 10.0.149.110	10.0.149.111
175	10.0.149.112/29	10.0.149.113 – 10.0.149.118	10.0.149.119
176	10.0.149.120/29	10.0.149.121 – 10.0.149.126	10.0.149.127
177	10.0.149.128/29	10.0.149.129 – 10.0.149.134	10.0.149.135
178	10.0.149.136/29	10.0.149.137 – 10.0.149.142	10.0.149.143
179	10.0.149.144/29	10.0.149.145 – 10.0.149.150	10.0.149.151
180	10.0.149.152/29	10.0.149.153 – 10.0.149.158	10.0.149.159
181	10.0.149.160/29	10.0.149.161 – 10.0.149.166	10.0.149.167
182	10.0.149.168/29	10.0.149.169 – 10.0.149.174	10.0.149.175
183	10.0.149.176/29	10.0.149.177 – 10.0.149.182	10.0.149.183
184	10.0.149.184/29	10.0.149.185 – 10.0.149.190	10.0.149.191
185	10.0.149.192/29	10.0.149.193 – 10.0.149.198	10.0.149.199
186	10.0.149.200/29	10.0.149.201 – 10.0.149.206	10.0.149.207
187	10.0.149.208/29	10.0.149.209 – 10.0.149.214	10.0.149.215
188	10.0.149.216/29	10.0.149.217 – 10.0.149.222	10.0.149.223
189	10.0.149.224/29	10.0.149.225 – 10.0.149.230	10.0.149.231
190	10.0.149.232/29	10.0.149.233 – 10.0.149.238	10.0.149.239
191	10.0.149.240/29	10.0.149.241 – 10.0.149.246	10.0.149.247
192	10.0.149.248/29	10.0.149.249 – 10.0.149.254	10.0.149.255
193	10.0.150.0/29	10.0.150.1 – 10.0.150.6	10.0.150.7
194	10.0.150.8/29	10.0.150.9 – 10.0.150.14	10.0.150.15
195	10.0.150.16/29	10.0.150.17 – 10.0.150.22	10.0.150.23
196	10.0.150.24/29	10.0.150.25 – 10.0.150.30	10.0.150.31
197	10.0.150.32/29	10.0.150.33 – 10.0.150.38	10.0.150.39
198	10.0.150.40/29	10.0.150.41 – 10.0.150.46	10.0.150.47
199	10.0.150.48/29	10.0.150.49 – 10.0.150.54	10.0.150.55
200	10.0.150.56/29	10.0.150.57 – 10.0.150.62	10.0.150.63
201	10.0.150.64/29	10.0.150.65 – 10.0.150.70	10.0.150.71
202	10.0.150.72/29	10.0.150.73 – 10.0.150.78	10.0.150.79
203	10.0.150.80/29	10.0.150.81 – 10.0.150.86	10.0.150.87
204	10.0.150.88/29	10.0.150.89 – 10.0.150.94	10.0.150.95
205	10.0.150.96/29	10.0.150.97 – 10.0.150.102	10.0.150.103
206	10.0.150.104/29	10.0.150.105 – 10.0.150.110	10.0.150.111
207	10.0.150.112/29	10.0.150.113 – 10.0.150.118	10.0.150.119
208	10.0.150.120/29	10.0.150.121 – 10.0.150.126	10.0.150.127
209	10.0.150.128/29	10.0.150.129 – 10.0.150.134	10.0.150.135
210	10.0.150.136/29	10.0.150.137 – 10.0.150.142	10.0.150.143
211	10.0.150.144/29	10.0.150.145 – 10.0.150.150	10.0.150.151
212	10.0.150.152/29	10.0.150.153 – 10.0.150.158	10.0.150.159
213	10.0.150.160/29	10.0.150.161 – 10.0.150.166	10.0.150.167
214	10.0.150.168/29	10.0.150.169 – 10.0.150.174	10.0.150.175
215	10.0.150.176/29	10.0.150.177 – 10.0.150.182	10.0.150.183
216	10.0.150.184/29	10.0.150.185 – 10.0.150.190	10.0.150.191
217	10.0.150.192/29	10.0.150.193 – 10.0.150.198	10.0.150.199
218	10.0.150.200/29	10.0.150.201 – 10.0.150.206	10.0.150.207
219	10.0.150.208/29	10.0.150.209 – 10.0.150.214	10.0.150.215
220	10.0.150.216/29	10.0.150.217 – 10.0.150.222	10.0.150.223
221	10.0.150.224/29	10.0.150.225 – 10.0.150.230	10.0.150.231
222	10.0.150.232/29	10.0.150.233 – 10.0.150.238	10.0.150.239
223	10.0.150.240/29	10.0.150.241 – 10.0.150.246	10.0.150.247
224	10.0.150.248/29	10.0.150.249 – 10.0.150.254	10.0.150.255
225	10.0.151.0/29	10.0.151.1 – 10.0.151.6	10.0.151.7
226	10.0.151.8/29	10.0.151.9 – 10.0.151.14	10.0.151.15
227	10.0.151.16/29	10.0.151.17 – 10.0.151.22	10.0.151.23
228	10.0.151.24/29	10.0.151.25 – 10.0.151.30	10.0.151.31
229	10.0.151.32/29	10.0.151.33 – 10.0.151.38	10.0.151.39
230	10.0.151.40/29	10.0.151.41 – 10.0.151.46	10.0.151.47
231	10.0.151.48/29	10.0.151.49 – 10.0.151.54	10.0.151.55
232	10.0.151.56/29	10.0.151.57 – 10.0.151.62	10.0.151.63
233	10.0.151.64/29	10.0.151.65 – 10.0.151.70	10.0.151.71
234	10.0.151.72/29	10.0.151.73 – 10.0.151.78	10.0.151.79
235	10.0.151.80/29	10.0.151.81 – 10.0.151.86	10.0.151.87
236	10.0.151.88/29	10.0.151.89 – 10.0.151.94	10.0.151.95
237	10.0.151.96/29	10.0.151.97 – 10.0.151.102	10.0.151.103
238	10.0.151.104/29	10.0.151.105 – 10.0.151.110	10.0.151.111
239	10.0.151.112/29	10.0.151.113 – 10.0.151.118	10.0.151.119
240	10.0.151.120/29	10.0.151.121 – 10.0.151.126	10.0.151.127
241	10.0.151.128/29	10.0.151.129 – 10.0.151.134	10.0.151.135
242	10.0.151.136/29	10.0.151.137 – 10.0.151.142	10.0.151.143
243	10.0.151.144/29	10.0.151.145 – 10.0.151.150	10.0.151.151
244	10.0.151.152/29	10.0.151.153 – 10.0.151.158	10.0.151.159
245	10.0.151.160/29	10.0.151.161 – 10.0.151.166	10.0.151.167
246	10.0.151.168/29	10.0.151.169 – 10.0.151.174	10.0.151.175
247	10.0.151.176/29	10.0.151.177 – 10.0.151.182	10.0.151.183
248	10.0.151.184/29	10.0.151.185 – 10.0.151.190	10.0.151.191
249	10.0.151.192/29	10.0.151.193 – 10.0.151.198	10.0.151.199
250	10.0.151.200/29	10.0.151.201 – 10.0.151.206	10.0.151.207
251	10.0.151.208/29	10.0.151.209 – 10.0.151.214	10.0.151.215
252	10.0.151.216/29	10.0.151.217 – 10.0.151.222	10.0.151.223
253	10.0.151.224/29	10.0.151.225 – 10.0.151.230	10.0.151.231
254	10.0.151.232/29	10.0.151.233 – 10.0.151.238	10.0.151.239
255	10.0.151.240/29	10.0.151.241 – 10.0.151.246	10.0.151.247
256	10.0.151.248/29	10.0.151.249 – 10.0.151.254	10.0.151.255

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 →