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)10.3.224.0/21

network10.3.224.0/21

broadcast10.3.231.255

first host10.3.224.1

last host10.3.231.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.224.0/21

address00001010.00000011.11100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.11100000.00000000

broadcast00001010.00000011.11100111.11111111

green = network part, grey = host part

hex0x0a03e000

decimal168026112

reverse dns0.224.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.224.0/29	10.3.224.1 – 10.3.224.6	10.3.224.7
2	10.3.224.8/29	10.3.224.9 – 10.3.224.14	10.3.224.15
3	10.3.224.16/29	10.3.224.17 – 10.3.224.22	10.3.224.23
4	10.3.224.24/29	10.3.224.25 – 10.3.224.30	10.3.224.31
5	10.3.224.32/29	10.3.224.33 – 10.3.224.38	10.3.224.39
6	10.3.224.40/29	10.3.224.41 – 10.3.224.46	10.3.224.47
7	10.3.224.48/29	10.3.224.49 – 10.3.224.54	10.3.224.55
8	10.3.224.56/29	10.3.224.57 – 10.3.224.62	10.3.224.63
9	10.3.224.64/29	10.3.224.65 – 10.3.224.70	10.3.224.71
10	10.3.224.72/29	10.3.224.73 – 10.3.224.78	10.3.224.79
11	10.3.224.80/29	10.3.224.81 – 10.3.224.86	10.3.224.87
12	10.3.224.88/29	10.3.224.89 – 10.3.224.94	10.3.224.95
13	10.3.224.96/29	10.3.224.97 – 10.3.224.102	10.3.224.103
14	10.3.224.104/29	10.3.224.105 – 10.3.224.110	10.3.224.111
15	10.3.224.112/29	10.3.224.113 – 10.3.224.118	10.3.224.119
16	10.3.224.120/29	10.3.224.121 – 10.3.224.126	10.3.224.127
17	10.3.224.128/29	10.3.224.129 – 10.3.224.134	10.3.224.135
18	10.3.224.136/29	10.3.224.137 – 10.3.224.142	10.3.224.143
19	10.3.224.144/29	10.3.224.145 – 10.3.224.150	10.3.224.151
20	10.3.224.152/29	10.3.224.153 – 10.3.224.158	10.3.224.159
21	10.3.224.160/29	10.3.224.161 – 10.3.224.166	10.3.224.167
22	10.3.224.168/29	10.3.224.169 – 10.3.224.174	10.3.224.175
23	10.3.224.176/29	10.3.224.177 – 10.3.224.182	10.3.224.183
24	10.3.224.184/29	10.3.224.185 – 10.3.224.190	10.3.224.191
25	10.3.224.192/29	10.3.224.193 – 10.3.224.198	10.3.224.199
26	10.3.224.200/29	10.3.224.201 – 10.3.224.206	10.3.224.207
27	10.3.224.208/29	10.3.224.209 – 10.3.224.214	10.3.224.215
28	10.3.224.216/29	10.3.224.217 – 10.3.224.222	10.3.224.223
29	10.3.224.224/29	10.3.224.225 – 10.3.224.230	10.3.224.231
30	10.3.224.232/29	10.3.224.233 – 10.3.224.238	10.3.224.239
31	10.3.224.240/29	10.3.224.241 – 10.3.224.246	10.3.224.247
32	10.3.224.248/29	10.3.224.249 – 10.3.224.254	10.3.224.255
33	10.3.225.0/29	10.3.225.1 – 10.3.225.6	10.3.225.7
34	10.3.225.8/29	10.3.225.9 – 10.3.225.14	10.3.225.15
35	10.3.225.16/29	10.3.225.17 – 10.3.225.22	10.3.225.23
36	10.3.225.24/29	10.3.225.25 – 10.3.225.30	10.3.225.31
37	10.3.225.32/29	10.3.225.33 – 10.3.225.38	10.3.225.39
38	10.3.225.40/29	10.3.225.41 – 10.3.225.46	10.3.225.47
39	10.3.225.48/29	10.3.225.49 – 10.3.225.54	10.3.225.55
40	10.3.225.56/29	10.3.225.57 – 10.3.225.62	10.3.225.63
41	10.3.225.64/29	10.3.225.65 – 10.3.225.70	10.3.225.71
42	10.3.225.72/29	10.3.225.73 – 10.3.225.78	10.3.225.79
43	10.3.225.80/29	10.3.225.81 – 10.3.225.86	10.3.225.87
44	10.3.225.88/29	10.3.225.89 – 10.3.225.94	10.3.225.95
45	10.3.225.96/29	10.3.225.97 – 10.3.225.102	10.3.225.103
46	10.3.225.104/29	10.3.225.105 – 10.3.225.110	10.3.225.111
47	10.3.225.112/29	10.3.225.113 – 10.3.225.118	10.3.225.119
48	10.3.225.120/29	10.3.225.121 – 10.3.225.126	10.3.225.127
49	10.3.225.128/29	10.3.225.129 – 10.3.225.134	10.3.225.135
50	10.3.225.136/29	10.3.225.137 – 10.3.225.142	10.3.225.143
51	10.3.225.144/29	10.3.225.145 – 10.3.225.150	10.3.225.151
52	10.3.225.152/29	10.3.225.153 – 10.3.225.158	10.3.225.159
53	10.3.225.160/29	10.3.225.161 – 10.3.225.166	10.3.225.167
54	10.3.225.168/29	10.3.225.169 – 10.3.225.174	10.3.225.175
55	10.3.225.176/29	10.3.225.177 – 10.3.225.182	10.3.225.183
56	10.3.225.184/29	10.3.225.185 – 10.3.225.190	10.3.225.191
57	10.3.225.192/29	10.3.225.193 – 10.3.225.198	10.3.225.199
58	10.3.225.200/29	10.3.225.201 – 10.3.225.206	10.3.225.207
59	10.3.225.208/29	10.3.225.209 – 10.3.225.214	10.3.225.215
60	10.3.225.216/29	10.3.225.217 – 10.3.225.222	10.3.225.223
61	10.3.225.224/29	10.3.225.225 – 10.3.225.230	10.3.225.231
62	10.3.225.232/29	10.3.225.233 – 10.3.225.238	10.3.225.239
63	10.3.225.240/29	10.3.225.241 – 10.3.225.246	10.3.225.247
64	10.3.225.248/29	10.3.225.249 – 10.3.225.254	10.3.225.255
65	10.3.226.0/29	10.3.226.1 – 10.3.226.6	10.3.226.7
66	10.3.226.8/29	10.3.226.9 – 10.3.226.14	10.3.226.15
67	10.3.226.16/29	10.3.226.17 – 10.3.226.22	10.3.226.23
68	10.3.226.24/29	10.3.226.25 – 10.3.226.30	10.3.226.31
69	10.3.226.32/29	10.3.226.33 – 10.3.226.38	10.3.226.39
70	10.3.226.40/29	10.3.226.41 – 10.3.226.46	10.3.226.47
71	10.3.226.48/29	10.3.226.49 – 10.3.226.54	10.3.226.55
72	10.3.226.56/29	10.3.226.57 – 10.3.226.62	10.3.226.63
73	10.3.226.64/29	10.3.226.65 – 10.3.226.70	10.3.226.71
74	10.3.226.72/29	10.3.226.73 – 10.3.226.78	10.3.226.79
75	10.3.226.80/29	10.3.226.81 – 10.3.226.86	10.3.226.87
76	10.3.226.88/29	10.3.226.89 – 10.3.226.94	10.3.226.95
77	10.3.226.96/29	10.3.226.97 – 10.3.226.102	10.3.226.103
78	10.3.226.104/29	10.3.226.105 – 10.3.226.110	10.3.226.111
79	10.3.226.112/29	10.3.226.113 – 10.3.226.118	10.3.226.119
80	10.3.226.120/29	10.3.226.121 – 10.3.226.126	10.3.226.127
81	10.3.226.128/29	10.3.226.129 – 10.3.226.134	10.3.226.135
82	10.3.226.136/29	10.3.226.137 – 10.3.226.142	10.3.226.143
83	10.3.226.144/29	10.3.226.145 – 10.3.226.150	10.3.226.151
84	10.3.226.152/29	10.3.226.153 – 10.3.226.158	10.3.226.159
85	10.3.226.160/29	10.3.226.161 – 10.3.226.166	10.3.226.167
86	10.3.226.168/29	10.3.226.169 – 10.3.226.174	10.3.226.175
87	10.3.226.176/29	10.3.226.177 – 10.3.226.182	10.3.226.183
88	10.3.226.184/29	10.3.226.185 – 10.3.226.190	10.3.226.191
89	10.3.226.192/29	10.3.226.193 – 10.3.226.198	10.3.226.199
90	10.3.226.200/29	10.3.226.201 – 10.3.226.206	10.3.226.207
91	10.3.226.208/29	10.3.226.209 – 10.3.226.214	10.3.226.215
92	10.3.226.216/29	10.3.226.217 – 10.3.226.222	10.3.226.223
93	10.3.226.224/29	10.3.226.225 – 10.3.226.230	10.3.226.231
94	10.3.226.232/29	10.3.226.233 – 10.3.226.238	10.3.226.239
95	10.3.226.240/29	10.3.226.241 – 10.3.226.246	10.3.226.247
96	10.3.226.248/29	10.3.226.249 – 10.3.226.254	10.3.226.255
97	10.3.227.0/29	10.3.227.1 – 10.3.227.6	10.3.227.7
98	10.3.227.8/29	10.3.227.9 – 10.3.227.14	10.3.227.15
99	10.3.227.16/29	10.3.227.17 – 10.3.227.22	10.3.227.23
100	10.3.227.24/29	10.3.227.25 – 10.3.227.30	10.3.227.31
101	10.3.227.32/29	10.3.227.33 – 10.3.227.38	10.3.227.39
102	10.3.227.40/29	10.3.227.41 – 10.3.227.46	10.3.227.47
103	10.3.227.48/29	10.3.227.49 – 10.3.227.54	10.3.227.55
104	10.3.227.56/29	10.3.227.57 – 10.3.227.62	10.3.227.63
105	10.3.227.64/29	10.3.227.65 – 10.3.227.70	10.3.227.71
106	10.3.227.72/29	10.3.227.73 – 10.3.227.78	10.3.227.79
107	10.3.227.80/29	10.3.227.81 – 10.3.227.86	10.3.227.87
108	10.3.227.88/29	10.3.227.89 – 10.3.227.94	10.3.227.95
109	10.3.227.96/29	10.3.227.97 – 10.3.227.102	10.3.227.103
110	10.3.227.104/29	10.3.227.105 – 10.3.227.110	10.3.227.111
111	10.3.227.112/29	10.3.227.113 – 10.3.227.118	10.3.227.119
112	10.3.227.120/29	10.3.227.121 – 10.3.227.126	10.3.227.127
113	10.3.227.128/29	10.3.227.129 – 10.3.227.134	10.3.227.135
114	10.3.227.136/29	10.3.227.137 – 10.3.227.142	10.3.227.143
115	10.3.227.144/29	10.3.227.145 – 10.3.227.150	10.3.227.151
116	10.3.227.152/29	10.3.227.153 – 10.3.227.158	10.3.227.159
117	10.3.227.160/29	10.3.227.161 – 10.3.227.166	10.3.227.167
118	10.3.227.168/29	10.3.227.169 – 10.3.227.174	10.3.227.175
119	10.3.227.176/29	10.3.227.177 – 10.3.227.182	10.3.227.183
120	10.3.227.184/29	10.3.227.185 – 10.3.227.190	10.3.227.191
121	10.3.227.192/29	10.3.227.193 – 10.3.227.198	10.3.227.199
122	10.3.227.200/29	10.3.227.201 – 10.3.227.206	10.3.227.207
123	10.3.227.208/29	10.3.227.209 – 10.3.227.214	10.3.227.215
124	10.3.227.216/29	10.3.227.217 – 10.3.227.222	10.3.227.223
125	10.3.227.224/29	10.3.227.225 – 10.3.227.230	10.3.227.231
126	10.3.227.232/29	10.3.227.233 – 10.3.227.238	10.3.227.239
127	10.3.227.240/29	10.3.227.241 – 10.3.227.246	10.3.227.247
128	10.3.227.248/29	10.3.227.249 – 10.3.227.254	10.3.227.255
129	10.3.228.0/29	10.3.228.1 – 10.3.228.6	10.3.228.7
130	10.3.228.8/29	10.3.228.9 – 10.3.228.14	10.3.228.15
131	10.3.228.16/29	10.3.228.17 – 10.3.228.22	10.3.228.23
132	10.3.228.24/29	10.3.228.25 – 10.3.228.30	10.3.228.31
133	10.3.228.32/29	10.3.228.33 – 10.3.228.38	10.3.228.39
134	10.3.228.40/29	10.3.228.41 – 10.3.228.46	10.3.228.47
135	10.3.228.48/29	10.3.228.49 – 10.3.228.54	10.3.228.55
136	10.3.228.56/29	10.3.228.57 – 10.3.228.62	10.3.228.63
137	10.3.228.64/29	10.3.228.65 – 10.3.228.70	10.3.228.71
138	10.3.228.72/29	10.3.228.73 – 10.3.228.78	10.3.228.79
139	10.3.228.80/29	10.3.228.81 – 10.3.228.86	10.3.228.87
140	10.3.228.88/29	10.3.228.89 – 10.3.228.94	10.3.228.95
141	10.3.228.96/29	10.3.228.97 – 10.3.228.102	10.3.228.103
142	10.3.228.104/29	10.3.228.105 – 10.3.228.110	10.3.228.111
143	10.3.228.112/29	10.3.228.113 – 10.3.228.118	10.3.228.119
144	10.3.228.120/29	10.3.228.121 – 10.3.228.126	10.3.228.127
145	10.3.228.128/29	10.3.228.129 – 10.3.228.134	10.3.228.135
146	10.3.228.136/29	10.3.228.137 – 10.3.228.142	10.3.228.143
147	10.3.228.144/29	10.3.228.145 – 10.3.228.150	10.3.228.151
148	10.3.228.152/29	10.3.228.153 – 10.3.228.158	10.3.228.159
149	10.3.228.160/29	10.3.228.161 – 10.3.228.166	10.3.228.167
150	10.3.228.168/29	10.3.228.169 – 10.3.228.174	10.3.228.175
151	10.3.228.176/29	10.3.228.177 – 10.3.228.182	10.3.228.183
152	10.3.228.184/29	10.3.228.185 – 10.3.228.190	10.3.228.191
153	10.3.228.192/29	10.3.228.193 – 10.3.228.198	10.3.228.199
154	10.3.228.200/29	10.3.228.201 – 10.3.228.206	10.3.228.207
155	10.3.228.208/29	10.3.228.209 – 10.3.228.214	10.3.228.215
156	10.3.228.216/29	10.3.228.217 – 10.3.228.222	10.3.228.223
157	10.3.228.224/29	10.3.228.225 – 10.3.228.230	10.3.228.231
158	10.3.228.232/29	10.3.228.233 – 10.3.228.238	10.3.228.239
159	10.3.228.240/29	10.3.228.241 – 10.3.228.246	10.3.228.247
160	10.3.228.248/29	10.3.228.249 – 10.3.228.254	10.3.228.255
161	10.3.229.0/29	10.3.229.1 – 10.3.229.6	10.3.229.7
162	10.3.229.8/29	10.3.229.9 – 10.3.229.14	10.3.229.15
163	10.3.229.16/29	10.3.229.17 – 10.3.229.22	10.3.229.23
164	10.3.229.24/29	10.3.229.25 – 10.3.229.30	10.3.229.31
165	10.3.229.32/29	10.3.229.33 – 10.3.229.38	10.3.229.39
166	10.3.229.40/29	10.3.229.41 – 10.3.229.46	10.3.229.47
167	10.3.229.48/29	10.3.229.49 – 10.3.229.54	10.3.229.55
168	10.3.229.56/29	10.3.229.57 – 10.3.229.62	10.3.229.63
169	10.3.229.64/29	10.3.229.65 – 10.3.229.70	10.3.229.71
170	10.3.229.72/29	10.3.229.73 – 10.3.229.78	10.3.229.79
171	10.3.229.80/29	10.3.229.81 – 10.3.229.86	10.3.229.87
172	10.3.229.88/29	10.3.229.89 – 10.3.229.94	10.3.229.95
173	10.3.229.96/29	10.3.229.97 – 10.3.229.102	10.3.229.103
174	10.3.229.104/29	10.3.229.105 – 10.3.229.110	10.3.229.111
175	10.3.229.112/29	10.3.229.113 – 10.3.229.118	10.3.229.119
176	10.3.229.120/29	10.3.229.121 – 10.3.229.126	10.3.229.127
177	10.3.229.128/29	10.3.229.129 – 10.3.229.134	10.3.229.135
178	10.3.229.136/29	10.3.229.137 – 10.3.229.142	10.3.229.143
179	10.3.229.144/29	10.3.229.145 – 10.3.229.150	10.3.229.151
180	10.3.229.152/29	10.3.229.153 – 10.3.229.158	10.3.229.159
181	10.3.229.160/29	10.3.229.161 – 10.3.229.166	10.3.229.167
182	10.3.229.168/29	10.3.229.169 – 10.3.229.174	10.3.229.175
183	10.3.229.176/29	10.3.229.177 – 10.3.229.182	10.3.229.183
184	10.3.229.184/29	10.3.229.185 – 10.3.229.190	10.3.229.191
185	10.3.229.192/29	10.3.229.193 – 10.3.229.198	10.3.229.199
186	10.3.229.200/29	10.3.229.201 – 10.3.229.206	10.3.229.207
187	10.3.229.208/29	10.3.229.209 – 10.3.229.214	10.3.229.215
188	10.3.229.216/29	10.3.229.217 – 10.3.229.222	10.3.229.223
189	10.3.229.224/29	10.3.229.225 – 10.3.229.230	10.3.229.231
190	10.3.229.232/29	10.3.229.233 – 10.3.229.238	10.3.229.239
191	10.3.229.240/29	10.3.229.241 – 10.3.229.246	10.3.229.247
192	10.3.229.248/29	10.3.229.249 – 10.3.229.254	10.3.229.255
193	10.3.230.0/29	10.3.230.1 – 10.3.230.6	10.3.230.7
194	10.3.230.8/29	10.3.230.9 – 10.3.230.14	10.3.230.15
195	10.3.230.16/29	10.3.230.17 – 10.3.230.22	10.3.230.23
196	10.3.230.24/29	10.3.230.25 – 10.3.230.30	10.3.230.31
197	10.3.230.32/29	10.3.230.33 – 10.3.230.38	10.3.230.39
198	10.3.230.40/29	10.3.230.41 – 10.3.230.46	10.3.230.47
199	10.3.230.48/29	10.3.230.49 – 10.3.230.54	10.3.230.55
200	10.3.230.56/29	10.3.230.57 – 10.3.230.62	10.3.230.63
201	10.3.230.64/29	10.3.230.65 – 10.3.230.70	10.3.230.71
202	10.3.230.72/29	10.3.230.73 – 10.3.230.78	10.3.230.79
203	10.3.230.80/29	10.3.230.81 – 10.3.230.86	10.3.230.87
204	10.3.230.88/29	10.3.230.89 – 10.3.230.94	10.3.230.95
205	10.3.230.96/29	10.3.230.97 – 10.3.230.102	10.3.230.103
206	10.3.230.104/29	10.3.230.105 – 10.3.230.110	10.3.230.111
207	10.3.230.112/29	10.3.230.113 – 10.3.230.118	10.3.230.119
208	10.3.230.120/29	10.3.230.121 – 10.3.230.126	10.3.230.127
209	10.3.230.128/29	10.3.230.129 – 10.3.230.134	10.3.230.135
210	10.3.230.136/29	10.3.230.137 – 10.3.230.142	10.3.230.143
211	10.3.230.144/29	10.3.230.145 – 10.3.230.150	10.3.230.151
212	10.3.230.152/29	10.3.230.153 – 10.3.230.158	10.3.230.159
213	10.3.230.160/29	10.3.230.161 – 10.3.230.166	10.3.230.167
214	10.3.230.168/29	10.3.230.169 – 10.3.230.174	10.3.230.175
215	10.3.230.176/29	10.3.230.177 – 10.3.230.182	10.3.230.183
216	10.3.230.184/29	10.3.230.185 – 10.3.230.190	10.3.230.191
217	10.3.230.192/29	10.3.230.193 – 10.3.230.198	10.3.230.199
218	10.3.230.200/29	10.3.230.201 – 10.3.230.206	10.3.230.207
219	10.3.230.208/29	10.3.230.209 – 10.3.230.214	10.3.230.215
220	10.3.230.216/29	10.3.230.217 – 10.3.230.222	10.3.230.223
221	10.3.230.224/29	10.3.230.225 – 10.3.230.230	10.3.230.231
222	10.3.230.232/29	10.3.230.233 – 10.3.230.238	10.3.230.239
223	10.3.230.240/29	10.3.230.241 – 10.3.230.246	10.3.230.247
224	10.3.230.248/29	10.3.230.249 – 10.3.230.254	10.3.230.255
225	10.3.231.0/29	10.3.231.1 – 10.3.231.6	10.3.231.7
226	10.3.231.8/29	10.3.231.9 – 10.3.231.14	10.3.231.15
227	10.3.231.16/29	10.3.231.17 – 10.3.231.22	10.3.231.23
228	10.3.231.24/29	10.3.231.25 – 10.3.231.30	10.3.231.31
229	10.3.231.32/29	10.3.231.33 – 10.3.231.38	10.3.231.39
230	10.3.231.40/29	10.3.231.41 – 10.3.231.46	10.3.231.47
231	10.3.231.48/29	10.3.231.49 – 10.3.231.54	10.3.231.55
232	10.3.231.56/29	10.3.231.57 – 10.3.231.62	10.3.231.63
233	10.3.231.64/29	10.3.231.65 – 10.3.231.70	10.3.231.71
234	10.3.231.72/29	10.3.231.73 – 10.3.231.78	10.3.231.79
235	10.3.231.80/29	10.3.231.81 – 10.3.231.86	10.3.231.87
236	10.3.231.88/29	10.3.231.89 – 10.3.231.94	10.3.231.95
237	10.3.231.96/29	10.3.231.97 – 10.3.231.102	10.3.231.103
238	10.3.231.104/29	10.3.231.105 – 10.3.231.110	10.3.231.111
239	10.3.231.112/29	10.3.231.113 – 10.3.231.118	10.3.231.119
240	10.3.231.120/29	10.3.231.121 – 10.3.231.126	10.3.231.127
241	10.3.231.128/29	10.3.231.129 – 10.3.231.134	10.3.231.135
242	10.3.231.136/29	10.3.231.137 – 10.3.231.142	10.3.231.143
243	10.3.231.144/29	10.3.231.145 – 10.3.231.150	10.3.231.151
244	10.3.231.152/29	10.3.231.153 – 10.3.231.158	10.3.231.159
245	10.3.231.160/29	10.3.231.161 – 10.3.231.166	10.3.231.167
246	10.3.231.168/29	10.3.231.169 – 10.3.231.174	10.3.231.175
247	10.3.231.176/29	10.3.231.177 – 10.3.231.182	10.3.231.183
248	10.3.231.184/29	10.3.231.185 – 10.3.231.190	10.3.231.191
249	10.3.231.192/29	10.3.231.193 – 10.3.231.198	10.3.231.199
250	10.3.231.200/29	10.3.231.201 – 10.3.231.206	10.3.231.207
251	10.3.231.208/29	10.3.231.209 – 10.3.231.214	10.3.231.215
252	10.3.231.216/29	10.3.231.217 – 10.3.231.222	10.3.231.223
253	10.3.231.224/29	10.3.231.225 – 10.3.231.230	10.3.231.231
254	10.3.231.232/29	10.3.231.233 – 10.3.231.238	10.3.231.239
255	10.3.231.240/29	10.3.231.241 – 10.3.231.246	10.3.231.247
256	10.3.231.248/29	10.3.231.249 – 10.3.231.254	10.3.231.255

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 →