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)10.215.0.0/16

network10.215.0.0/16

broadcast10.215.255.255

first host10.215.0.1

last host10.215.255.254

subnet mask255.255.0.0

wildcard0.0.255.255

addresses65,536

usable hosts65,534

classA

ipcalc 10.215.0.0/16

address00001010.11010111.00000000.00000000

subnet mask11111111.11111111.00000000.00000000

network00001010.11010111.00000000.00000000

broadcast00001010.11010111.11111111.11111111

green = network part, grey = host part

hex0x0ad70000

decimal181862400

reverse dns0.0.215.10.in-addr.arpa

ipv4-mapped::ffff:ad7:0

/16 split into /29 · 8,192 subnets

close ×

#	network	host range	broadcast
1	10.215.0.0/29	10.215.0.1 – 10.215.0.6	10.215.0.7
2	10.215.0.8/29	10.215.0.9 – 10.215.0.14	10.215.0.15
3	10.215.0.16/29	10.215.0.17 – 10.215.0.22	10.215.0.23
4	10.215.0.24/29	10.215.0.25 – 10.215.0.30	10.215.0.31
5	10.215.0.32/29	10.215.0.33 – 10.215.0.38	10.215.0.39
6	10.215.0.40/29	10.215.0.41 – 10.215.0.46	10.215.0.47
7	10.215.0.48/29	10.215.0.49 – 10.215.0.54	10.215.0.55
8	10.215.0.56/29	10.215.0.57 – 10.215.0.62	10.215.0.63
9	10.215.0.64/29	10.215.0.65 – 10.215.0.70	10.215.0.71
10	10.215.0.72/29	10.215.0.73 – 10.215.0.78	10.215.0.79
11	10.215.0.80/29	10.215.0.81 – 10.215.0.86	10.215.0.87
12	10.215.0.88/29	10.215.0.89 – 10.215.0.94	10.215.0.95
13	10.215.0.96/29	10.215.0.97 – 10.215.0.102	10.215.0.103
14	10.215.0.104/29	10.215.0.105 – 10.215.0.110	10.215.0.111
15	10.215.0.112/29	10.215.0.113 – 10.215.0.118	10.215.0.119
16	10.215.0.120/29	10.215.0.121 – 10.215.0.126	10.215.0.127
17	10.215.0.128/29	10.215.0.129 – 10.215.0.134	10.215.0.135
18	10.215.0.136/29	10.215.0.137 – 10.215.0.142	10.215.0.143
19	10.215.0.144/29	10.215.0.145 – 10.215.0.150	10.215.0.151
20	10.215.0.152/29	10.215.0.153 – 10.215.0.158	10.215.0.159
21	10.215.0.160/29	10.215.0.161 – 10.215.0.166	10.215.0.167
22	10.215.0.168/29	10.215.0.169 – 10.215.0.174	10.215.0.175
23	10.215.0.176/29	10.215.0.177 – 10.215.0.182	10.215.0.183
24	10.215.0.184/29	10.215.0.185 – 10.215.0.190	10.215.0.191
25	10.215.0.192/29	10.215.0.193 – 10.215.0.198	10.215.0.199
26	10.215.0.200/29	10.215.0.201 – 10.215.0.206	10.215.0.207
27	10.215.0.208/29	10.215.0.209 – 10.215.0.214	10.215.0.215
28	10.215.0.216/29	10.215.0.217 – 10.215.0.222	10.215.0.223
29	10.215.0.224/29	10.215.0.225 – 10.215.0.230	10.215.0.231
30	10.215.0.232/29	10.215.0.233 – 10.215.0.238	10.215.0.239
31	10.215.0.240/29	10.215.0.241 – 10.215.0.246	10.215.0.247
32	10.215.0.248/29	10.215.0.249 – 10.215.0.254	10.215.0.255
33	10.215.1.0/29	10.215.1.1 – 10.215.1.6	10.215.1.7
34	10.215.1.8/29	10.215.1.9 – 10.215.1.14	10.215.1.15
35	10.215.1.16/29	10.215.1.17 – 10.215.1.22	10.215.1.23
36	10.215.1.24/29	10.215.1.25 – 10.215.1.30	10.215.1.31
37	10.215.1.32/29	10.215.1.33 – 10.215.1.38	10.215.1.39
38	10.215.1.40/29	10.215.1.41 – 10.215.1.46	10.215.1.47
39	10.215.1.48/29	10.215.1.49 – 10.215.1.54	10.215.1.55
40	10.215.1.56/29	10.215.1.57 – 10.215.1.62	10.215.1.63
41	10.215.1.64/29	10.215.1.65 – 10.215.1.70	10.215.1.71
42	10.215.1.72/29	10.215.1.73 – 10.215.1.78	10.215.1.79
43	10.215.1.80/29	10.215.1.81 – 10.215.1.86	10.215.1.87
44	10.215.1.88/29	10.215.1.89 – 10.215.1.94	10.215.1.95
45	10.215.1.96/29	10.215.1.97 – 10.215.1.102	10.215.1.103
46	10.215.1.104/29	10.215.1.105 – 10.215.1.110	10.215.1.111
47	10.215.1.112/29	10.215.1.113 – 10.215.1.118	10.215.1.119
48	10.215.1.120/29	10.215.1.121 – 10.215.1.126	10.215.1.127
49	10.215.1.128/29	10.215.1.129 – 10.215.1.134	10.215.1.135
50	10.215.1.136/29	10.215.1.137 – 10.215.1.142	10.215.1.143
51	10.215.1.144/29	10.215.1.145 – 10.215.1.150	10.215.1.151
52	10.215.1.152/29	10.215.1.153 – 10.215.1.158	10.215.1.159
53	10.215.1.160/29	10.215.1.161 – 10.215.1.166	10.215.1.167
54	10.215.1.168/29	10.215.1.169 – 10.215.1.174	10.215.1.175
55	10.215.1.176/29	10.215.1.177 – 10.215.1.182	10.215.1.183
56	10.215.1.184/29	10.215.1.185 – 10.215.1.190	10.215.1.191
57	10.215.1.192/29	10.215.1.193 – 10.215.1.198	10.215.1.199
58	10.215.1.200/29	10.215.1.201 – 10.215.1.206	10.215.1.207
59	10.215.1.208/29	10.215.1.209 – 10.215.1.214	10.215.1.215
60	10.215.1.216/29	10.215.1.217 – 10.215.1.222	10.215.1.223
61	10.215.1.224/29	10.215.1.225 – 10.215.1.230	10.215.1.231
62	10.215.1.232/29	10.215.1.233 – 10.215.1.238	10.215.1.239
63	10.215.1.240/29	10.215.1.241 – 10.215.1.246	10.215.1.247
64	10.215.1.248/29	10.215.1.249 – 10.215.1.254	10.215.1.255
65	10.215.2.0/29	10.215.2.1 – 10.215.2.6	10.215.2.7
66	10.215.2.8/29	10.215.2.9 – 10.215.2.14	10.215.2.15
67	10.215.2.16/29	10.215.2.17 – 10.215.2.22	10.215.2.23
68	10.215.2.24/29	10.215.2.25 – 10.215.2.30	10.215.2.31
69	10.215.2.32/29	10.215.2.33 – 10.215.2.38	10.215.2.39
70	10.215.2.40/29	10.215.2.41 – 10.215.2.46	10.215.2.47
71	10.215.2.48/29	10.215.2.49 – 10.215.2.54	10.215.2.55
72	10.215.2.56/29	10.215.2.57 – 10.215.2.62	10.215.2.63
73	10.215.2.64/29	10.215.2.65 – 10.215.2.70	10.215.2.71
74	10.215.2.72/29	10.215.2.73 – 10.215.2.78	10.215.2.79
75	10.215.2.80/29	10.215.2.81 – 10.215.2.86	10.215.2.87
76	10.215.2.88/29	10.215.2.89 – 10.215.2.94	10.215.2.95
77	10.215.2.96/29	10.215.2.97 – 10.215.2.102	10.215.2.103
78	10.215.2.104/29	10.215.2.105 – 10.215.2.110	10.215.2.111
79	10.215.2.112/29	10.215.2.113 – 10.215.2.118	10.215.2.119
80	10.215.2.120/29	10.215.2.121 – 10.215.2.126	10.215.2.127
81	10.215.2.128/29	10.215.2.129 – 10.215.2.134	10.215.2.135
82	10.215.2.136/29	10.215.2.137 – 10.215.2.142	10.215.2.143
83	10.215.2.144/29	10.215.2.145 – 10.215.2.150	10.215.2.151
84	10.215.2.152/29	10.215.2.153 – 10.215.2.158	10.215.2.159
85	10.215.2.160/29	10.215.2.161 – 10.215.2.166	10.215.2.167
86	10.215.2.168/29	10.215.2.169 – 10.215.2.174	10.215.2.175
87	10.215.2.176/29	10.215.2.177 – 10.215.2.182	10.215.2.183
88	10.215.2.184/29	10.215.2.185 – 10.215.2.190	10.215.2.191
89	10.215.2.192/29	10.215.2.193 – 10.215.2.198	10.215.2.199
90	10.215.2.200/29	10.215.2.201 – 10.215.2.206	10.215.2.207
91	10.215.2.208/29	10.215.2.209 – 10.215.2.214	10.215.2.215
92	10.215.2.216/29	10.215.2.217 – 10.215.2.222	10.215.2.223
93	10.215.2.224/29	10.215.2.225 – 10.215.2.230	10.215.2.231
94	10.215.2.232/29	10.215.2.233 – 10.215.2.238	10.215.2.239
95	10.215.2.240/29	10.215.2.241 – 10.215.2.246	10.215.2.247
96	10.215.2.248/29	10.215.2.249 – 10.215.2.254	10.215.2.255
97	10.215.3.0/29	10.215.3.1 – 10.215.3.6	10.215.3.7
98	10.215.3.8/29	10.215.3.9 – 10.215.3.14	10.215.3.15
99	10.215.3.16/29	10.215.3.17 – 10.215.3.22	10.215.3.23
100	10.215.3.24/29	10.215.3.25 – 10.215.3.30	10.215.3.31
101	10.215.3.32/29	10.215.3.33 – 10.215.3.38	10.215.3.39
102	10.215.3.40/29	10.215.3.41 – 10.215.3.46	10.215.3.47
103	10.215.3.48/29	10.215.3.49 – 10.215.3.54	10.215.3.55
104	10.215.3.56/29	10.215.3.57 – 10.215.3.62	10.215.3.63
105	10.215.3.64/29	10.215.3.65 – 10.215.3.70	10.215.3.71
106	10.215.3.72/29	10.215.3.73 – 10.215.3.78	10.215.3.79
107	10.215.3.80/29	10.215.3.81 – 10.215.3.86	10.215.3.87
108	10.215.3.88/29	10.215.3.89 – 10.215.3.94	10.215.3.95
109	10.215.3.96/29	10.215.3.97 – 10.215.3.102	10.215.3.103
110	10.215.3.104/29	10.215.3.105 – 10.215.3.110	10.215.3.111
111	10.215.3.112/29	10.215.3.113 – 10.215.3.118	10.215.3.119
112	10.215.3.120/29	10.215.3.121 – 10.215.3.126	10.215.3.127
113	10.215.3.128/29	10.215.3.129 – 10.215.3.134	10.215.3.135
114	10.215.3.136/29	10.215.3.137 – 10.215.3.142	10.215.3.143
115	10.215.3.144/29	10.215.3.145 – 10.215.3.150	10.215.3.151
116	10.215.3.152/29	10.215.3.153 – 10.215.3.158	10.215.3.159
117	10.215.3.160/29	10.215.3.161 – 10.215.3.166	10.215.3.167
118	10.215.3.168/29	10.215.3.169 – 10.215.3.174	10.215.3.175
119	10.215.3.176/29	10.215.3.177 – 10.215.3.182	10.215.3.183
120	10.215.3.184/29	10.215.3.185 – 10.215.3.190	10.215.3.191
121	10.215.3.192/29	10.215.3.193 – 10.215.3.198	10.215.3.199
122	10.215.3.200/29	10.215.3.201 – 10.215.3.206	10.215.3.207
123	10.215.3.208/29	10.215.3.209 – 10.215.3.214	10.215.3.215
124	10.215.3.216/29	10.215.3.217 – 10.215.3.222	10.215.3.223
125	10.215.3.224/29	10.215.3.225 – 10.215.3.230	10.215.3.231
126	10.215.3.232/29	10.215.3.233 – 10.215.3.238	10.215.3.239
127	10.215.3.240/29	10.215.3.241 – 10.215.3.246	10.215.3.247
128	10.215.3.248/29	10.215.3.249 – 10.215.3.254	10.215.3.255
129	10.215.4.0/29	10.215.4.1 – 10.215.4.6	10.215.4.7
130	10.215.4.8/29	10.215.4.9 – 10.215.4.14	10.215.4.15
131	10.215.4.16/29	10.215.4.17 – 10.215.4.22	10.215.4.23
132	10.215.4.24/29	10.215.4.25 – 10.215.4.30	10.215.4.31
133	10.215.4.32/29	10.215.4.33 – 10.215.4.38	10.215.4.39
134	10.215.4.40/29	10.215.4.41 – 10.215.4.46	10.215.4.47
135	10.215.4.48/29	10.215.4.49 – 10.215.4.54	10.215.4.55
136	10.215.4.56/29	10.215.4.57 – 10.215.4.62	10.215.4.63
137	10.215.4.64/29	10.215.4.65 – 10.215.4.70	10.215.4.71
138	10.215.4.72/29	10.215.4.73 – 10.215.4.78	10.215.4.79
139	10.215.4.80/29	10.215.4.81 – 10.215.4.86	10.215.4.87
140	10.215.4.88/29	10.215.4.89 – 10.215.4.94	10.215.4.95
141	10.215.4.96/29	10.215.4.97 – 10.215.4.102	10.215.4.103
142	10.215.4.104/29	10.215.4.105 – 10.215.4.110	10.215.4.111
143	10.215.4.112/29	10.215.4.113 – 10.215.4.118	10.215.4.119
144	10.215.4.120/29	10.215.4.121 – 10.215.4.126	10.215.4.127
145	10.215.4.128/29	10.215.4.129 – 10.215.4.134	10.215.4.135
146	10.215.4.136/29	10.215.4.137 – 10.215.4.142	10.215.4.143
147	10.215.4.144/29	10.215.4.145 – 10.215.4.150	10.215.4.151
148	10.215.4.152/29	10.215.4.153 – 10.215.4.158	10.215.4.159
149	10.215.4.160/29	10.215.4.161 – 10.215.4.166	10.215.4.167
150	10.215.4.168/29	10.215.4.169 – 10.215.4.174	10.215.4.175
151	10.215.4.176/29	10.215.4.177 – 10.215.4.182	10.215.4.183
152	10.215.4.184/29	10.215.4.185 – 10.215.4.190	10.215.4.191
153	10.215.4.192/29	10.215.4.193 – 10.215.4.198	10.215.4.199
154	10.215.4.200/29	10.215.4.201 – 10.215.4.206	10.215.4.207
155	10.215.4.208/29	10.215.4.209 – 10.215.4.214	10.215.4.215
156	10.215.4.216/29	10.215.4.217 – 10.215.4.222	10.215.4.223
157	10.215.4.224/29	10.215.4.225 – 10.215.4.230	10.215.4.231
158	10.215.4.232/29	10.215.4.233 – 10.215.4.238	10.215.4.239
159	10.215.4.240/29	10.215.4.241 – 10.215.4.246	10.215.4.247
160	10.215.4.248/29	10.215.4.249 – 10.215.4.254	10.215.4.255
161	10.215.5.0/29	10.215.5.1 – 10.215.5.6	10.215.5.7
162	10.215.5.8/29	10.215.5.9 – 10.215.5.14	10.215.5.15
163	10.215.5.16/29	10.215.5.17 – 10.215.5.22	10.215.5.23
164	10.215.5.24/29	10.215.5.25 – 10.215.5.30	10.215.5.31
165	10.215.5.32/29	10.215.5.33 – 10.215.5.38	10.215.5.39
166	10.215.5.40/29	10.215.5.41 – 10.215.5.46	10.215.5.47
167	10.215.5.48/29	10.215.5.49 – 10.215.5.54	10.215.5.55
168	10.215.5.56/29	10.215.5.57 – 10.215.5.62	10.215.5.63
169	10.215.5.64/29	10.215.5.65 – 10.215.5.70	10.215.5.71
170	10.215.5.72/29	10.215.5.73 – 10.215.5.78	10.215.5.79
171	10.215.5.80/29	10.215.5.81 – 10.215.5.86	10.215.5.87
172	10.215.5.88/29	10.215.5.89 – 10.215.5.94	10.215.5.95
173	10.215.5.96/29	10.215.5.97 – 10.215.5.102	10.215.5.103
174	10.215.5.104/29	10.215.5.105 – 10.215.5.110	10.215.5.111
175	10.215.5.112/29	10.215.5.113 – 10.215.5.118	10.215.5.119
176	10.215.5.120/29	10.215.5.121 – 10.215.5.126	10.215.5.127
177	10.215.5.128/29	10.215.5.129 – 10.215.5.134	10.215.5.135
178	10.215.5.136/29	10.215.5.137 – 10.215.5.142	10.215.5.143
179	10.215.5.144/29	10.215.5.145 – 10.215.5.150	10.215.5.151
180	10.215.5.152/29	10.215.5.153 – 10.215.5.158	10.215.5.159
181	10.215.5.160/29	10.215.5.161 – 10.215.5.166	10.215.5.167
182	10.215.5.168/29	10.215.5.169 – 10.215.5.174	10.215.5.175
183	10.215.5.176/29	10.215.5.177 – 10.215.5.182	10.215.5.183
184	10.215.5.184/29	10.215.5.185 – 10.215.5.190	10.215.5.191
185	10.215.5.192/29	10.215.5.193 – 10.215.5.198	10.215.5.199
186	10.215.5.200/29	10.215.5.201 – 10.215.5.206	10.215.5.207
187	10.215.5.208/29	10.215.5.209 – 10.215.5.214	10.215.5.215
188	10.215.5.216/29	10.215.5.217 – 10.215.5.222	10.215.5.223
189	10.215.5.224/29	10.215.5.225 – 10.215.5.230	10.215.5.231
190	10.215.5.232/29	10.215.5.233 – 10.215.5.238	10.215.5.239
191	10.215.5.240/29	10.215.5.241 – 10.215.5.246	10.215.5.247
192	10.215.5.248/29	10.215.5.249 – 10.215.5.254	10.215.5.255
193	10.215.6.0/29	10.215.6.1 – 10.215.6.6	10.215.6.7
194	10.215.6.8/29	10.215.6.9 – 10.215.6.14	10.215.6.15
195	10.215.6.16/29	10.215.6.17 – 10.215.6.22	10.215.6.23
196	10.215.6.24/29	10.215.6.25 – 10.215.6.30	10.215.6.31
197	10.215.6.32/29	10.215.6.33 – 10.215.6.38	10.215.6.39
198	10.215.6.40/29	10.215.6.41 – 10.215.6.46	10.215.6.47
199	10.215.6.48/29	10.215.6.49 – 10.215.6.54	10.215.6.55
200	10.215.6.56/29	10.215.6.57 – 10.215.6.62	10.215.6.63
201	10.215.6.64/29	10.215.6.65 – 10.215.6.70	10.215.6.71
202	10.215.6.72/29	10.215.6.73 – 10.215.6.78	10.215.6.79
203	10.215.6.80/29	10.215.6.81 – 10.215.6.86	10.215.6.87
204	10.215.6.88/29	10.215.6.89 – 10.215.6.94	10.215.6.95
205	10.215.6.96/29	10.215.6.97 – 10.215.6.102	10.215.6.103
206	10.215.6.104/29	10.215.6.105 – 10.215.6.110	10.215.6.111
207	10.215.6.112/29	10.215.6.113 – 10.215.6.118	10.215.6.119
208	10.215.6.120/29	10.215.6.121 – 10.215.6.126	10.215.6.127
209	10.215.6.128/29	10.215.6.129 – 10.215.6.134	10.215.6.135
210	10.215.6.136/29	10.215.6.137 – 10.215.6.142	10.215.6.143
211	10.215.6.144/29	10.215.6.145 – 10.215.6.150	10.215.6.151
212	10.215.6.152/29	10.215.6.153 – 10.215.6.158	10.215.6.159
213	10.215.6.160/29	10.215.6.161 – 10.215.6.166	10.215.6.167
214	10.215.6.168/29	10.215.6.169 – 10.215.6.174	10.215.6.175
215	10.215.6.176/29	10.215.6.177 – 10.215.6.182	10.215.6.183
216	10.215.6.184/29	10.215.6.185 – 10.215.6.190	10.215.6.191
217	10.215.6.192/29	10.215.6.193 – 10.215.6.198	10.215.6.199
218	10.215.6.200/29	10.215.6.201 – 10.215.6.206	10.215.6.207
219	10.215.6.208/29	10.215.6.209 – 10.215.6.214	10.215.6.215
220	10.215.6.216/29	10.215.6.217 – 10.215.6.222	10.215.6.223
221	10.215.6.224/29	10.215.6.225 – 10.215.6.230	10.215.6.231
222	10.215.6.232/29	10.215.6.233 – 10.215.6.238	10.215.6.239
223	10.215.6.240/29	10.215.6.241 – 10.215.6.246	10.215.6.247
224	10.215.6.248/29	10.215.6.249 – 10.215.6.254	10.215.6.255
225	10.215.7.0/29	10.215.7.1 – 10.215.7.6	10.215.7.7
226	10.215.7.8/29	10.215.7.9 – 10.215.7.14	10.215.7.15
227	10.215.7.16/29	10.215.7.17 – 10.215.7.22	10.215.7.23
228	10.215.7.24/29	10.215.7.25 – 10.215.7.30	10.215.7.31
229	10.215.7.32/29	10.215.7.33 – 10.215.7.38	10.215.7.39
230	10.215.7.40/29	10.215.7.41 – 10.215.7.46	10.215.7.47
231	10.215.7.48/29	10.215.7.49 – 10.215.7.54	10.215.7.55
232	10.215.7.56/29	10.215.7.57 – 10.215.7.62	10.215.7.63
233	10.215.7.64/29	10.215.7.65 – 10.215.7.70	10.215.7.71
234	10.215.7.72/29	10.215.7.73 – 10.215.7.78	10.215.7.79
235	10.215.7.80/29	10.215.7.81 – 10.215.7.86	10.215.7.87
236	10.215.7.88/29	10.215.7.89 – 10.215.7.94	10.215.7.95
237	10.215.7.96/29	10.215.7.97 – 10.215.7.102	10.215.7.103
238	10.215.7.104/29	10.215.7.105 – 10.215.7.110	10.215.7.111
239	10.215.7.112/29	10.215.7.113 – 10.215.7.118	10.215.7.119
240	10.215.7.120/29	10.215.7.121 – 10.215.7.126	10.215.7.127
241	10.215.7.128/29	10.215.7.129 – 10.215.7.134	10.215.7.135
242	10.215.7.136/29	10.215.7.137 – 10.215.7.142	10.215.7.143
243	10.215.7.144/29	10.215.7.145 – 10.215.7.150	10.215.7.151
244	10.215.7.152/29	10.215.7.153 – 10.215.7.158	10.215.7.159
245	10.215.7.160/29	10.215.7.161 – 10.215.7.166	10.215.7.167
246	10.215.7.168/29	10.215.7.169 – 10.215.7.174	10.215.7.175
247	10.215.7.176/29	10.215.7.177 – 10.215.7.182	10.215.7.183
248	10.215.7.184/29	10.215.7.185 – 10.215.7.190	10.215.7.191
249	10.215.7.192/29	10.215.7.193 – 10.215.7.198	10.215.7.199
250	10.215.7.200/29	10.215.7.201 – 10.215.7.206	10.215.7.207
251	10.215.7.208/29	10.215.7.209 – 10.215.7.214	10.215.7.215
252	10.215.7.216/29	10.215.7.217 – 10.215.7.222	10.215.7.223
253	10.215.7.224/29	10.215.7.225 – 10.215.7.230	10.215.7.231
254	10.215.7.232/29	10.215.7.233 – 10.215.7.238	10.215.7.239
255	10.215.7.240/29	10.215.7.241 – 10.215.7.246	10.215.7.247
256	10.215.7.248/29	10.215.7.249 – 10.215.7.254	10.215.7.255

showing 256 of 8,192

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 /16
/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	1
/17	255.255.128.0	32,768	32,766	2 split →
/18	255.255.192.0	16,384	16,382	4 split →
/19	255.255.224.0	8,192	8,190	8 split →
/20	255.255.240.0	4,096	4,094	16 split →
/21	255.255.248.0	2,048	2,046	32 split →
/22	255.255.252.0	1,024	1,022	64 split →
/23	255.255.254.0	512	510	128 split →
/24	255.255.255.0	256	254	256 split →
/25	255.255.255.128	128	126	512 split →
/26	255.255.255.192	64	62	1,024 split →
/27	255.255.255.224	32	30	2,048 split →
/28	255.255.255.240	16	14	4,096 split →
/29	255.255.255.248	8	6	8,192 split →
/30	255.255.255.252	4	2	16,384 split →
/31	255.255.255.254	2	2	32,768 split →
/32	255.255.255.255	1	1	65,536 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 →