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)10.3.32.0/21

network10.3.32.0/21

broadcast10.3.39.255

first host10.3.32.1

last host10.3.39.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.32.0/21

address00001010.00000011.00100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.00100000.00000000

broadcast00001010.00000011.00100111.11111111

green = network part, grey = host part

hex0x0a032000

decimal167976960

reverse dns0.32.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.32.0/29	10.3.32.1 – 10.3.32.6	10.3.32.7
2	10.3.32.8/29	10.3.32.9 – 10.3.32.14	10.3.32.15
3	10.3.32.16/29	10.3.32.17 – 10.3.32.22	10.3.32.23
4	10.3.32.24/29	10.3.32.25 – 10.3.32.30	10.3.32.31
5	10.3.32.32/29	10.3.32.33 – 10.3.32.38	10.3.32.39
6	10.3.32.40/29	10.3.32.41 – 10.3.32.46	10.3.32.47
7	10.3.32.48/29	10.3.32.49 – 10.3.32.54	10.3.32.55
8	10.3.32.56/29	10.3.32.57 – 10.3.32.62	10.3.32.63
9	10.3.32.64/29	10.3.32.65 – 10.3.32.70	10.3.32.71
10	10.3.32.72/29	10.3.32.73 – 10.3.32.78	10.3.32.79
11	10.3.32.80/29	10.3.32.81 – 10.3.32.86	10.3.32.87
12	10.3.32.88/29	10.3.32.89 – 10.3.32.94	10.3.32.95
13	10.3.32.96/29	10.3.32.97 – 10.3.32.102	10.3.32.103
14	10.3.32.104/29	10.3.32.105 – 10.3.32.110	10.3.32.111
15	10.3.32.112/29	10.3.32.113 – 10.3.32.118	10.3.32.119
16	10.3.32.120/29	10.3.32.121 – 10.3.32.126	10.3.32.127
17	10.3.32.128/29	10.3.32.129 – 10.3.32.134	10.3.32.135
18	10.3.32.136/29	10.3.32.137 – 10.3.32.142	10.3.32.143
19	10.3.32.144/29	10.3.32.145 – 10.3.32.150	10.3.32.151
20	10.3.32.152/29	10.3.32.153 – 10.3.32.158	10.3.32.159
21	10.3.32.160/29	10.3.32.161 – 10.3.32.166	10.3.32.167
22	10.3.32.168/29	10.3.32.169 – 10.3.32.174	10.3.32.175
23	10.3.32.176/29	10.3.32.177 – 10.3.32.182	10.3.32.183
24	10.3.32.184/29	10.3.32.185 – 10.3.32.190	10.3.32.191
25	10.3.32.192/29	10.3.32.193 – 10.3.32.198	10.3.32.199
26	10.3.32.200/29	10.3.32.201 – 10.3.32.206	10.3.32.207
27	10.3.32.208/29	10.3.32.209 – 10.3.32.214	10.3.32.215
28	10.3.32.216/29	10.3.32.217 – 10.3.32.222	10.3.32.223
29	10.3.32.224/29	10.3.32.225 – 10.3.32.230	10.3.32.231
30	10.3.32.232/29	10.3.32.233 – 10.3.32.238	10.3.32.239
31	10.3.32.240/29	10.3.32.241 – 10.3.32.246	10.3.32.247
32	10.3.32.248/29	10.3.32.249 – 10.3.32.254	10.3.32.255
33	10.3.33.0/29	10.3.33.1 – 10.3.33.6	10.3.33.7
34	10.3.33.8/29	10.3.33.9 – 10.3.33.14	10.3.33.15
35	10.3.33.16/29	10.3.33.17 – 10.3.33.22	10.3.33.23
36	10.3.33.24/29	10.3.33.25 – 10.3.33.30	10.3.33.31
37	10.3.33.32/29	10.3.33.33 – 10.3.33.38	10.3.33.39
38	10.3.33.40/29	10.3.33.41 – 10.3.33.46	10.3.33.47
39	10.3.33.48/29	10.3.33.49 – 10.3.33.54	10.3.33.55
40	10.3.33.56/29	10.3.33.57 – 10.3.33.62	10.3.33.63
41	10.3.33.64/29	10.3.33.65 – 10.3.33.70	10.3.33.71
42	10.3.33.72/29	10.3.33.73 – 10.3.33.78	10.3.33.79
43	10.3.33.80/29	10.3.33.81 – 10.3.33.86	10.3.33.87
44	10.3.33.88/29	10.3.33.89 – 10.3.33.94	10.3.33.95
45	10.3.33.96/29	10.3.33.97 – 10.3.33.102	10.3.33.103
46	10.3.33.104/29	10.3.33.105 – 10.3.33.110	10.3.33.111
47	10.3.33.112/29	10.3.33.113 – 10.3.33.118	10.3.33.119
48	10.3.33.120/29	10.3.33.121 – 10.3.33.126	10.3.33.127
49	10.3.33.128/29	10.3.33.129 – 10.3.33.134	10.3.33.135
50	10.3.33.136/29	10.3.33.137 – 10.3.33.142	10.3.33.143
51	10.3.33.144/29	10.3.33.145 – 10.3.33.150	10.3.33.151
52	10.3.33.152/29	10.3.33.153 – 10.3.33.158	10.3.33.159
53	10.3.33.160/29	10.3.33.161 – 10.3.33.166	10.3.33.167
54	10.3.33.168/29	10.3.33.169 – 10.3.33.174	10.3.33.175
55	10.3.33.176/29	10.3.33.177 – 10.3.33.182	10.3.33.183
56	10.3.33.184/29	10.3.33.185 – 10.3.33.190	10.3.33.191
57	10.3.33.192/29	10.3.33.193 – 10.3.33.198	10.3.33.199
58	10.3.33.200/29	10.3.33.201 – 10.3.33.206	10.3.33.207
59	10.3.33.208/29	10.3.33.209 – 10.3.33.214	10.3.33.215
60	10.3.33.216/29	10.3.33.217 – 10.3.33.222	10.3.33.223
61	10.3.33.224/29	10.3.33.225 – 10.3.33.230	10.3.33.231
62	10.3.33.232/29	10.3.33.233 – 10.3.33.238	10.3.33.239
63	10.3.33.240/29	10.3.33.241 – 10.3.33.246	10.3.33.247
64	10.3.33.248/29	10.3.33.249 – 10.3.33.254	10.3.33.255
65	10.3.34.0/29	10.3.34.1 – 10.3.34.6	10.3.34.7
66	10.3.34.8/29	10.3.34.9 – 10.3.34.14	10.3.34.15
67	10.3.34.16/29	10.3.34.17 – 10.3.34.22	10.3.34.23
68	10.3.34.24/29	10.3.34.25 – 10.3.34.30	10.3.34.31
69	10.3.34.32/29	10.3.34.33 – 10.3.34.38	10.3.34.39
70	10.3.34.40/29	10.3.34.41 – 10.3.34.46	10.3.34.47
71	10.3.34.48/29	10.3.34.49 – 10.3.34.54	10.3.34.55
72	10.3.34.56/29	10.3.34.57 – 10.3.34.62	10.3.34.63
73	10.3.34.64/29	10.3.34.65 – 10.3.34.70	10.3.34.71
74	10.3.34.72/29	10.3.34.73 – 10.3.34.78	10.3.34.79
75	10.3.34.80/29	10.3.34.81 – 10.3.34.86	10.3.34.87
76	10.3.34.88/29	10.3.34.89 – 10.3.34.94	10.3.34.95
77	10.3.34.96/29	10.3.34.97 – 10.3.34.102	10.3.34.103
78	10.3.34.104/29	10.3.34.105 – 10.3.34.110	10.3.34.111
79	10.3.34.112/29	10.3.34.113 – 10.3.34.118	10.3.34.119
80	10.3.34.120/29	10.3.34.121 – 10.3.34.126	10.3.34.127
81	10.3.34.128/29	10.3.34.129 – 10.3.34.134	10.3.34.135
82	10.3.34.136/29	10.3.34.137 – 10.3.34.142	10.3.34.143
83	10.3.34.144/29	10.3.34.145 – 10.3.34.150	10.3.34.151
84	10.3.34.152/29	10.3.34.153 – 10.3.34.158	10.3.34.159
85	10.3.34.160/29	10.3.34.161 – 10.3.34.166	10.3.34.167
86	10.3.34.168/29	10.3.34.169 – 10.3.34.174	10.3.34.175
87	10.3.34.176/29	10.3.34.177 – 10.3.34.182	10.3.34.183
88	10.3.34.184/29	10.3.34.185 – 10.3.34.190	10.3.34.191
89	10.3.34.192/29	10.3.34.193 – 10.3.34.198	10.3.34.199
90	10.3.34.200/29	10.3.34.201 – 10.3.34.206	10.3.34.207
91	10.3.34.208/29	10.3.34.209 – 10.3.34.214	10.3.34.215
92	10.3.34.216/29	10.3.34.217 – 10.3.34.222	10.3.34.223
93	10.3.34.224/29	10.3.34.225 – 10.3.34.230	10.3.34.231
94	10.3.34.232/29	10.3.34.233 – 10.3.34.238	10.3.34.239
95	10.3.34.240/29	10.3.34.241 – 10.3.34.246	10.3.34.247
96	10.3.34.248/29	10.3.34.249 – 10.3.34.254	10.3.34.255
97	10.3.35.0/29	10.3.35.1 – 10.3.35.6	10.3.35.7
98	10.3.35.8/29	10.3.35.9 – 10.3.35.14	10.3.35.15
99	10.3.35.16/29	10.3.35.17 – 10.3.35.22	10.3.35.23
100	10.3.35.24/29	10.3.35.25 – 10.3.35.30	10.3.35.31
101	10.3.35.32/29	10.3.35.33 – 10.3.35.38	10.3.35.39
102	10.3.35.40/29	10.3.35.41 – 10.3.35.46	10.3.35.47
103	10.3.35.48/29	10.3.35.49 – 10.3.35.54	10.3.35.55
104	10.3.35.56/29	10.3.35.57 – 10.3.35.62	10.3.35.63
105	10.3.35.64/29	10.3.35.65 – 10.3.35.70	10.3.35.71
106	10.3.35.72/29	10.3.35.73 – 10.3.35.78	10.3.35.79
107	10.3.35.80/29	10.3.35.81 – 10.3.35.86	10.3.35.87
108	10.3.35.88/29	10.3.35.89 – 10.3.35.94	10.3.35.95
109	10.3.35.96/29	10.3.35.97 – 10.3.35.102	10.3.35.103
110	10.3.35.104/29	10.3.35.105 – 10.3.35.110	10.3.35.111
111	10.3.35.112/29	10.3.35.113 – 10.3.35.118	10.3.35.119
112	10.3.35.120/29	10.3.35.121 – 10.3.35.126	10.3.35.127
113	10.3.35.128/29	10.3.35.129 – 10.3.35.134	10.3.35.135
114	10.3.35.136/29	10.3.35.137 – 10.3.35.142	10.3.35.143
115	10.3.35.144/29	10.3.35.145 – 10.3.35.150	10.3.35.151
116	10.3.35.152/29	10.3.35.153 – 10.3.35.158	10.3.35.159
117	10.3.35.160/29	10.3.35.161 – 10.3.35.166	10.3.35.167
118	10.3.35.168/29	10.3.35.169 – 10.3.35.174	10.3.35.175
119	10.3.35.176/29	10.3.35.177 – 10.3.35.182	10.3.35.183
120	10.3.35.184/29	10.3.35.185 – 10.3.35.190	10.3.35.191
121	10.3.35.192/29	10.3.35.193 – 10.3.35.198	10.3.35.199
122	10.3.35.200/29	10.3.35.201 – 10.3.35.206	10.3.35.207
123	10.3.35.208/29	10.3.35.209 – 10.3.35.214	10.3.35.215
124	10.3.35.216/29	10.3.35.217 – 10.3.35.222	10.3.35.223
125	10.3.35.224/29	10.3.35.225 – 10.3.35.230	10.3.35.231
126	10.3.35.232/29	10.3.35.233 – 10.3.35.238	10.3.35.239
127	10.3.35.240/29	10.3.35.241 – 10.3.35.246	10.3.35.247
128	10.3.35.248/29	10.3.35.249 – 10.3.35.254	10.3.35.255
129	10.3.36.0/29	10.3.36.1 – 10.3.36.6	10.3.36.7
130	10.3.36.8/29	10.3.36.9 – 10.3.36.14	10.3.36.15
131	10.3.36.16/29	10.3.36.17 – 10.3.36.22	10.3.36.23
132	10.3.36.24/29	10.3.36.25 – 10.3.36.30	10.3.36.31
133	10.3.36.32/29	10.3.36.33 – 10.3.36.38	10.3.36.39
134	10.3.36.40/29	10.3.36.41 – 10.3.36.46	10.3.36.47
135	10.3.36.48/29	10.3.36.49 – 10.3.36.54	10.3.36.55
136	10.3.36.56/29	10.3.36.57 – 10.3.36.62	10.3.36.63
137	10.3.36.64/29	10.3.36.65 – 10.3.36.70	10.3.36.71
138	10.3.36.72/29	10.3.36.73 – 10.3.36.78	10.3.36.79
139	10.3.36.80/29	10.3.36.81 – 10.3.36.86	10.3.36.87
140	10.3.36.88/29	10.3.36.89 – 10.3.36.94	10.3.36.95
141	10.3.36.96/29	10.3.36.97 – 10.3.36.102	10.3.36.103
142	10.3.36.104/29	10.3.36.105 – 10.3.36.110	10.3.36.111
143	10.3.36.112/29	10.3.36.113 – 10.3.36.118	10.3.36.119
144	10.3.36.120/29	10.3.36.121 – 10.3.36.126	10.3.36.127
145	10.3.36.128/29	10.3.36.129 – 10.3.36.134	10.3.36.135
146	10.3.36.136/29	10.3.36.137 – 10.3.36.142	10.3.36.143
147	10.3.36.144/29	10.3.36.145 – 10.3.36.150	10.3.36.151
148	10.3.36.152/29	10.3.36.153 – 10.3.36.158	10.3.36.159
149	10.3.36.160/29	10.3.36.161 – 10.3.36.166	10.3.36.167
150	10.3.36.168/29	10.3.36.169 – 10.3.36.174	10.3.36.175
151	10.3.36.176/29	10.3.36.177 – 10.3.36.182	10.3.36.183
152	10.3.36.184/29	10.3.36.185 – 10.3.36.190	10.3.36.191
153	10.3.36.192/29	10.3.36.193 – 10.3.36.198	10.3.36.199
154	10.3.36.200/29	10.3.36.201 – 10.3.36.206	10.3.36.207
155	10.3.36.208/29	10.3.36.209 – 10.3.36.214	10.3.36.215
156	10.3.36.216/29	10.3.36.217 – 10.3.36.222	10.3.36.223
157	10.3.36.224/29	10.3.36.225 – 10.3.36.230	10.3.36.231
158	10.3.36.232/29	10.3.36.233 – 10.3.36.238	10.3.36.239
159	10.3.36.240/29	10.3.36.241 – 10.3.36.246	10.3.36.247
160	10.3.36.248/29	10.3.36.249 – 10.3.36.254	10.3.36.255
161	10.3.37.0/29	10.3.37.1 – 10.3.37.6	10.3.37.7
162	10.3.37.8/29	10.3.37.9 – 10.3.37.14	10.3.37.15
163	10.3.37.16/29	10.3.37.17 – 10.3.37.22	10.3.37.23
164	10.3.37.24/29	10.3.37.25 – 10.3.37.30	10.3.37.31
165	10.3.37.32/29	10.3.37.33 – 10.3.37.38	10.3.37.39
166	10.3.37.40/29	10.3.37.41 – 10.3.37.46	10.3.37.47
167	10.3.37.48/29	10.3.37.49 – 10.3.37.54	10.3.37.55
168	10.3.37.56/29	10.3.37.57 – 10.3.37.62	10.3.37.63
169	10.3.37.64/29	10.3.37.65 – 10.3.37.70	10.3.37.71
170	10.3.37.72/29	10.3.37.73 – 10.3.37.78	10.3.37.79
171	10.3.37.80/29	10.3.37.81 – 10.3.37.86	10.3.37.87
172	10.3.37.88/29	10.3.37.89 – 10.3.37.94	10.3.37.95
173	10.3.37.96/29	10.3.37.97 – 10.3.37.102	10.3.37.103
174	10.3.37.104/29	10.3.37.105 – 10.3.37.110	10.3.37.111
175	10.3.37.112/29	10.3.37.113 – 10.3.37.118	10.3.37.119
176	10.3.37.120/29	10.3.37.121 – 10.3.37.126	10.3.37.127
177	10.3.37.128/29	10.3.37.129 – 10.3.37.134	10.3.37.135
178	10.3.37.136/29	10.3.37.137 – 10.3.37.142	10.3.37.143
179	10.3.37.144/29	10.3.37.145 – 10.3.37.150	10.3.37.151
180	10.3.37.152/29	10.3.37.153 – 10.3.37.158	10.3.37.159
181	10.3.37.160/29	10.3.37.161 – 10.3.37.166	10.3.37.167
182	10.3.37.168/29	10.3.37.169 – 10.3.37.174	10.3.37.175
183	10.3.37.176/29	10.3.37.177 – 10.3.37.182	10.3.37.183
184	10.3.37.184/29	10.3.37.185 – 10.3.37.190	10.3.37.191
185	10.3.37.192/29	10.3.37.193 – 10.3.37.198	10.3.37.199
186	10.3.37.200/29	10.3.37.201 – 10.3.37.206	10.3.37.207
187	10.3.37.208/29	10.3.37.209 – 10.3.37.214	10.3.37.215
188	10.3.37.216/29	10.3.37.217 – 10.3.37.222	10.3.37.223
189	10.3.37.224/29	10.3.37.225 – 10.3.37.230	10.3.37.231
190	10.3.37.232/29	10.3.37.233 – 10.3.37.238	10.3.37.239
191	10.3.37.240/29	10.3.37.241 – 10.3.37.246	10.3.37.247
192	10.3.37.248/29	10.3.37.249 – 10.3.37.254	10.3.37.255
193	10.3.38.0/29	10.3.38.1 – 10.3.38.6	10.3.38.7
194	10.3.38.8/29	10.3.38.9 – 10.3.38.14	10.3.38.15
195	10.3.38.16/29	10.3.38.17 – 10.3.38.22	10.3.38.23
196	10.3.38.24/29	10.3.38.25 – 10.3.38.30	10.3.38.31
197	10.3.38.32/29	10.3.38.33 – 10.3.38.38	10.3.38.39
198	10.3.38.40/29	10.3.38.41 – 10.3.38.46	10.3.38.47
199	10.3.38.48/29	10.3.38.49 – 10.3.38.54	10.3.38.55
200	10.3.38.56/29	10.3.38.57 – 10.3.38.62	10.3.38.63
201	10.3.38.64/29	10.3.38.65 – 10.3.38.70	10.3.38.71
202	10.3.38.72/29	10.3.38.73 – 10.3.38.78	10.3.38.79
203	10.3.38.80/29	10.3.38.81 – 10.3.38.86	10.3.38.87
204	10.3.38.88/29	10.3.38.89 – 10.3.38.94	10.3.38.95
205	10.3.38.96/29	10.3.38.97 – 10.3.38.102	10.3.38.103
206	10.3.38.104/29	10.3.38.105 – 10.3.38.110	10.3.38.111
207	10.3.38.112/29	10.3.38.113 – 10.3.38.118	10.3.38.119
208	10.3.38.120/29	10.3.38.121 – 10.3.38.126	10.3.38.127
209	10.3.38.128/29	10.3.38.129 – 10.3.38.134	10.3.38.135
210	10.3.38.136/29	10.3.38.137 – 10.3.38.142	10.3.38.143
211	10.3.38.144/29	10.3.38.145 – 10.3.38.150	10.3.38.151
212	10.3.38.152/29	10.3.38.153 – 10.3.38.158	10.3.38.159
213	10.3.38.160/29	10.3.38.161 – 10.3.38.166	10.3.38.167
214	10.3.38.168/29	10.3.38.169 – 10.3.38.174	10.3.38.175
215	10.3.38.176/29	10.3.38.177 – 10.3.38.182	10.3.38.183
216	10.3.38.184/29	10.3.38.185 – 10.3.38.190	10.3.38.191
217	10.3.38.192/29	10.3.38.193 – 10.3.38.198	10.3.38.199
218	10.3.38.200/29	10.3.38.201 – 10.3.38.206	10.3.38.207
219	10.3.38.208/29	10.3.38.209 – 10.3.38.214	10.3.38.215
220	10.3.38.216/29	10.3.38.217 – 10.3.38.222	10.3.38.223
221	10.3.38.224/29	10.3.38.225 – 10.3.38.230	10.3.38.231
222	10.3.38.232/29	10.3.38.233 – 10.3.38.238	10.3.38.239
223	10.3.38.240/29	10.3.38.241 – 10.3.38.246	10.3.38.247
224	10.3.38.248/29	10.3.38.249 – 10.3.38.254	10.3.38.255
225	10.3.39.0/29	10.3.39.1 – 10.3.39.6	10.3.39.7
226	10.3.39.8/29	10.3.39.9 – 10.3.39.14	10.3.39.15
227	10.3.39.16/29	10.3.39.17 – 10.3.39.22	10.3.39.23
228	10.3.39.24/29	10.3.39.25 – 10.3.39.30	10.3.39.31
229	10.3.39.32/29	10.3.39.33 – 10.3.39.38	10.3.39.39
230	10.3.39.40/29	10.3.39.41 – 10.3.39.46	10.3.39.47
231	10.3.39.48/29	10.3.39.49 – 10.3.39.54	10.3.39.55
232	10.3.39.56/29	10.3.39.57 – 10.3.39.62	10.3.39.63
233	10.3.39.64/29	10.3.39.65 – 10.3.39.70	10.3.39.71
234	10.3.39.72/29	10.3.39.73 – 10.3.39.78	10.3.39.79
235	10.3.39.80/29	10.3.39.81 – 10.3.39.86	10.3.39.87
236	10.3.39.88/29	10.3.39.89 – 10.3.39.94	10.3.39.95
237	10.3.39.96/29	10.3.39.97 – 10.3.39.102	10.3.39.103
238	10.3.39.104/29	10.3.39.105 – 10.3.39.110	10.3.39.111
239	10.3.39.112/29	10.3.39.113 – 10.3.39.118	10.3.39.119
240	10.3.39.120/29	10.3.39.121 – 10.3.39.126	10.3.39.127
241	10.3.39.128/29	10.3.39.129 – 10.3.39.134	10.3.39.135
242	10.3.39.136/29	10.3.39.137 – 10.3.39.142	10.3.39.143
243	10.3.39.144/29	10.3.39.145 – 10.3.39.150	10.3.39.151
244	10.3.39.152/29	10.3.39.153 – 10.3.39.158	10.3.39.159
245	10.3.39.160/29	10.3.39.161 – 10.3.39.166	10.3.39.167
246	10.3.39.168/29	10.3.39.169 – 10.3.39.174	10.3.39.175
247	10.3.39.176/29	10.3.39.177 – 10.3.39.182	10.3.39.183
248	10.3.39.184/29	10.3.39.185 – 10.3.39.190	10.3.39.191
249	10.3.39.192/29	10.3.39.193 – 10.3.39.198	10.3.39.199
250	10.3.39.200/29	10.3.39.201 – 10.3.39.206	10.3.39.207
251	10.3.39.208/29	10.3.39.209 – 10.3.39.214	10.3.39.215
252	10.3.39.216/29	10.3.39.217 – 10.3.39.222	10.3.39.223
253	10.3.39.224/29	10.3.39.225 – 10.3.39.230	10.3.39.231
254	10.3.39.232/29	10.3.39.233 – 10.3.39.238	10.3.39.239
255	10.3.39.240/29	10.3.39.241 – 10.3.39.246	10.3.39.247
256	10.3.39.248/29	10.3.39.249 – 10.3.39.254	10.3.39.255

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 →