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)10.73.0.0/17

network10.73.0.0/17

broadcast10.73.127.255

first host10.73.0.1

last host10.73.127.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.73.0.0/17

address00001010.01001001.00000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.01001001.00000000.00000000

broadcast00001010.01001001.01111111.11111111

green = network part, grey = host part

hex0x0a490000

decimal172556288

reverse dns0.0.73.10.in-addr.arpa

ipv4-mapped::ffff:a49:0

/17 split into /29 · 4,096 subnets

close ×

#	network	host range	broadcast
1	10.73.0.0/29	10.73.0.1 – 10.73.0.6	10.73.0.7
2	10.73.0.8/29	10.73.0.9 – 10.73.0.14	10.73.0.15
3	10.73.0.16/29	10.73.0.17 – 10.73.0.22	10.73.0.23
4	10.73.0.24/29	10.73.0.25 – 10.73.0.30	10.73.0.31
5	10.73.0.32/29	10.73.0.33 – 10.73.0.38	10.73.0.39
6	10.73.0.40/29	10.73.0.41 – 10.73.0.46	10.73.0.47
7	10.73.0.48/29	10.73.0.49 – 10.73.0.54	10.73.0.55
8	10.73.0.56/29	10.73.0.57 – 10.73.0.62	10.73.0.63
9	10.73.0.64/29	10.73.0.65 – 10.73.0.70	10.73.0.71
10	10.73.0.72/29	10.73.0.73 – 10.73.0.78	10.73.0.79
11	10.73.0.80/29	10.73.0.81 – 10.73.0.86	10.73.0.87
12	10.73.0.88/29	10.73.0.89 – 10.73.0.94	10.73.0.95
13	10.73.0.96/29	10.73.0.97 – 10.73.0.102	10.73.0.103
14	10.73.0.104/29	10.73.0.105 – 10.73.0.110	10.73.0.111
15	10.73.0.112/29	10.73.0.113 – 10.73.0.118	10.73.0.119
16	10.73.0.120/29	10.73.0.121 – 10.73.0.126	10.73.0.127
17	10.73.0.128/29	10.73.0.129 – 10.73.0.134	10.73.0.135
18	10.73.0.136/29	10.73.0.137 – 10.73.0.142	10.73.0.143
19	10.73.0.144/29	10.73.0.145 – 10.73.0.150	10.73.0.151
20	10.73.0.152/29	10.73.0.153 – 10.73.0.158	10.73.0.159
21	10.73.0.160/29	10.73.0.161 – 10.73.0.166	10.73.0.167
22	10.73.0.168/29	10.73.0.169 – 10.73.0.174	10.73.0.175
23	10.73.0.176/29	10.73.0.177 – 10.73.0.182	10.73.0.183
24	10.73.0.184/29	10.73.0.185 – 10.73.0.190	10.73.0.191
25	10.73.0.192/29	10.73.0.193 – 10.73.0.198	10.73.0.199
26	10.73.0.200/29	10.73.0.201 – 10.73.0.206	10.73.0.207
27	10.73.0.208/29	10.73.0.209 – 10.73.0.214	10.73.0.215
28	10.73.0.216/29	10.73.0.217 – 10.73.0.222	10.73.0.223
29	10.73.0.224/29	10.73.0.225 – 10.73.0.230	10.73.0.231
30	10.73.0.232/29	10.73.0.233 – 10.73.0.238	10.73.0.239
31	10.73.0.240/29	10.73.0.241 – 10.73.0.246	10.73.0.247
32	10.73.0.248/29	10.73.0.249 – 10.73.0.254	10.73.0.255
33	10.73.1.0/29	10.73.1.1 – 10.73.1.6	10.73.1.7
34	10.73.1.8/29	10.73.1.9 – 10.73.1.14	10.73.1.15
35	10.73.1.16/29	10.73.1.17 – 10.73.1.22	10.73.1.23
36	10.73.1.24/29	10.73.1.25 – 10.73.1.30	10.73.1.31
37	10.73.1.32/29	10.73.1.33 – 10.73.1.38	10.73.1.39
38	10.73.1.40/29	10.73.1.41 – 10.73.1.46	10.73.1.47
39	10.73.1.48/29	10.73.1.49 – 10.73.1.54	10.73.1.55
40	10.73.1.56/29	10.73.1.57 – 10.73.1.62	10.73.1.63
41	10.73.1.64/29	10.73.1.65 – 10.73.1.70	10.73.1.71
42	10.73.1.72/29	10.73.1.73 – 10.73.1.78	10.73.1.79
43	10.73.1.80/29	10.73.1.81 – 10.73.1.86	10.73.1.87
44	10.73.1.88/29	10.73.1.89 – 10.73.1.94	10.73.1.95
45	10.73.1.96/29	10.73.1.97 – 10.73.1.102	10.73.1.103
46	10.73.1.104/29	10.73.1.105 – 10.73.1.110	10.73.1.111
47	10.73.1.112/29	10.73.1.113 – 10.73.1.118	10.73.1.119
48	10.73.1.120/29	10.73.1.121 – 10.73.1.126	10.73.1.127
49	10.73.1.128/29	10.73.1.129 – 10.73.1.134	10.73.1.135
50	10.73.1.136/29	10.73.1.137 – 10.73.1.142	10.73.1.143
51	10.73.1.144/29	10.73.1.145 – 10.73.1.150	10.73.1.151
52	10.73.1.152/29	10.73.1.153 – 10.73.1.158	10.73.1.159
53	10.73.1.160/29	10.73.1.161 – 10.73.1.166	10.73.1.167
54	10.73.1.168/29	10.73.1.169 – 10.73.1.174	10.73.1.175
55	10.73.1.176/29	10.73.1.177 – 10.73.1.182	10.73.1.183
56	10.73.1.184/29	10.73.1.185 – 10.73.1.190	10.73.1.191
57	10.73.1.192/29	10.73.1.193 – 10.73.1.198	10.73.1.199
58	10.73.1.200/29	10.73.1.201 – 10.73.1.206	10.73.1.207
59	10.73.1.208/29	10.73.1.209 – 10.73.1.214	10.73.1.215
60	10.73.1.216/29	10.73.1.217 – 10.73.1.222	10.73.1.223
61	10.73.1.224/29	10.73.1.225 – 10.73.1.230	10.73.1.231
62	10.73.1.232/29	10.73.1.233 – 10.73.1.238	10.73.1.239
63	10.73.1.240/29	10.73.1.241 – 10.73.1.246	10.73.1.247
64	10.73.1.248/29	10.73.1.249 – 10.73.1.254	10.73.1.255
65	10.73.2.0/29	10.73.2.1 – 10.73.2.6	10.73.2.7
66	10.73.2.8/29	10.73.2.9 – 10.73.2.14	10.73.2.15
67	10.73.2.16/29	10.73.2.17 – 10.73.2.22	10.73.2.23
68	10.73.2.24/29	10.73.2.25 – 10.73.2.30	10.73.2.31
69	10.73.2.32/29	10.73.2.33 – 10.73.2.38	10.73.2.39
70	10.73.2.40/29	10.73.2.41 – 10.73.2.46	10.73.2.47
71	10.73.2.48/29	10.73.2.49 – 10.73.2.54	10.73.2.55
72	10.73.2.56/29	10.73.2.57 – 10.73.2.62	10.73.2.63
73	10.73.2.64/29	10.73.2.65 – 10.73.2.70	10.73.2.71
74	10.73.2.72/29	10.73.2.73 – 10.73.2.78	10.73.2.79
75	10.73.2.80/29	10.73.2.81 – 10.73.2.86	10.73.2.87
76	10.73.2.88/29	10.73.2.89 – 10.73.2.94	10.73.2.95
77	10.73.2.96/29	10.73.2.97 – 10.73.2.102	10.73.2.103
78	10.73.2.104/29	10.73.2.105 – 10.73.2.110	10.73.2.111
79	10.73.2.112/29	10.73.2.113 – 10.73.2.118	10.73.2.119
80	10.73.2.120/29	10.73.2.121 – 10.73.2.126	10.73.2.127
81	10.73.2.128/29	10.73.2.129 – 10.73.2.134	10.73.2.135
82	10.73.2.136/29	10.73.2.137 – 10.73.2.142	10.73.2.143
83	10.73.2.144/29	10.73.2.145 – 10.73.2.150	10.73.2.151
84	10.73.2.152/29	10.73.2.153 – 10.73.2.158	10.73.2.159
85	10.73.2.160/29	10.73.2.161 – 10.73.2.166	10.73.2.167
86	10.73.2.168/29	10.73.2.169 – 10.73.2.174	10.73.2.175
87	10.73.2.176/29	10.73.2.177 – 10.73.2.182	10.73.2.183
88	10.73.2.184/29	10.73.2.185 – 10.73.2.190	10.73.2.191
89	10.73.2.192/29	10.73.2.193 – 10.73.2.198	10.73.2.199
90	10.73.2.200/29	10.73.2.201 – 10.73.2.206	10.73.2.207
91	10.73.2.208/29	10.73.2.209 – 10.73.2.214	10.73.2.215
92	10.73.2.216/29	10.73.2.217 – 10.73.2.222	10.73.2.223
93	10.73.2.224/29	10.73.2.225 – 10.73.2.230	10.73.2.231
94	10.73.2.232/29	10.73.2.233 – 10.73.2.238	10.73.2.239
95	10.73.2.240/29	10.73.2.241 – 10.73.2.246	10.73.2.247
96	10.73.2.248/29	10.73.2.249 – 10.73.2.254	10.73.2.255
97	10.73.3.0/29	10.73.3.1 – 10.73.3.6	10.73.3.7
98	10.73.3.8/29	10.73.3.9 – 10.73.3.14	10.73.3.15
99	10.73.3.16/29	10.73.3.17 – 10.73.3.22	10.73.3.23
100	10.73.3.24/29	10.73.3.25 – 10.73.3.30	10.73.3.31
101	10.73.3.32/29	10.73.3.33 – 10.73.3.38	10.73.3.39
102	10.73.3.40/29	10.73.3.41 – 10.73.3.46	10.73.3.47
103	10.73.3.48/29	10.73.3.49 – 10.73.3.54	10.73.3.55
104	10.73.3.56/29	10.73.3.57 – 10.73.3.62	10.73.3.63
105	10.73.3.64/29	10.73.3.65 – 10.73.3.70	10.73.3.71
106	10.73.3.72/29	10.73.3.73 – 10.73.3.78	10.73.3.79
107	10.73.3.80/29	10.73.3.81 – 10.73.3.86	10.73.3.87
108	10.73.3.88/29	10.73.3.89 – 10.73.3.94	10.73.3.95
109	10.73.3.96/29	10.73.3.97 – 10.73.3.102	10.73.3.103
110	10.73.3.104/29	10.73.3.105 – 10.73.3.110	10.73.3.111
111	10.73.3.112/29	10.73.3.113 – 10.73.3.118	10.73.3.119
112	10.73.3.120/29	10.73.3.121 – 10.73.3.126	10.73.3.127
113	10.73.3.128/29	10.73.3.129 – 10.73.3.134	10.73.3.135
114	10.73.3.136/29	10.73.3.137 – 10.73.3.142	10.73.3.143
115	10.73.3.144/29	10.73.3.145 – 10.73.3.150	10.73.3.151
116	10.73.3.152/29	10.73.3.153 – 10.73.3.158	10.73.3.159
117	10.73.3.160/29	10.73.3.161 – 10.73.3.166	10.73.3.167
118	10.73.3.168/29	10.73.3.169 – 10.73.3.174	10.73.3.175
119	10.73.3.176/29	10.73.3.177 – 10.73.3.182	10.73.3.183
120	10.73.3.184/29	10.73.3.185 – 10.73.3.190	10.73.3.191
121	10.73.3.192/29	10.73.3.193 – 10.73.3.198	10.73.3.199
122	10.73.3.200/29	10.73.3.201 – 10.73.3.206	10.73.3.207
123	10.73.3.208/29	10.73.3.209 – 10.73.3.214	10.73.3.215
124	10.73.3.216/29	10.73.3.217 – 10.73.3.222	10.73.3.223
125	10.73.3.224/29	10.73.3.225 – 10.73.3.230	10.73.3.231
126	10.73.3.232/29	10.73.3.233 – 10.73.3.238	10.73.3.239
127	10.73.3.240/29	10.73.3.241 – 10.73.3.246	10.73.3.247
128	10.73.3.248/29	10.73.3.249 – 10.73.3.254	10.73.3.255
129	10.73.4.0/29	10.73.4.1 – 10.73.4.6	10.73.4.7
130	10.73.4.8/29	10.73.4.9 – 10.73.4.14	10.73.4.15
131	10.73.4.16/29	10.73.4.17 – 10.73.4.22	10.73.4.23
132	10.73.4.24/29	10.73.4.25 – 10.73.4.30	10.73.4.31
133	10.73.4.32/29	10.73.4.33 – 10.73.4.38	10.73.4.39
134	10.73.4.40/29	10.73.4.41 – 10.73.4.46	10.73.4.47
135	10.73.4.48/29	10.73.4.49 – 10.73.4.54	10.73.4.55
136	10.73.4.56/29	10.73.4.57 – 10.73.4.62	10.73.4.63
137	10.73.4.64/29	10.73.4.65 – 10.73.4.70	10.73.4.71
138	10.73.4.72/29	10.73.4.73 – 10.73.4.78	10.73.4.79
139	10.73.4.80/29	10.73.4.81 – 10.73.4.86	10.73.4.87
140	10.73.4.88/29	10.73.4.89 – 10.73.4.94	10.73.4.95
141	10.73.4.96/29	10.73.4.97 – 10.73.4.102	10.73.4.103
142	10.73.4.104/29	10.73.4.105 – 10.73.4.110	10.73.4.111
143	10.73.4.112/29	10.73.4.113 – 10.73.4.118	10.73.4.119
144	10.73.4.120/29	10.73.4.121 – 10.73.4.126	10.73.4.127
145	10.73.4.128/29	10.73.4.129 – 10.73.4.134	10.73.4.135
146	10.73.4.136/29	10.73.4.137 – 10.73.4.142	10.73.4.143
147	10.73.4.144/29	10.73.4.145 – 10.73.4.150	10.73.4.151
148	10.73.4.152/29	10.73.4.153 – 10.73.4.158	10.73.4.159
149	10.73.4.160/29	10.73.4.161 – 10.73.4.166	10.73.4.167
150	10.73.4.168/29	10.73.4.169 – 10.73.4.174	10.73.4.175
151	10.73.4.176/29	10.73.4.177 – 10.73.4.182	10.73.4.183
152	10.73.4.184/29	10.73.4.185 – 10.73.4.190	10.73.4.191
153	10.73.4.192/29	10.73.4.193 – 10.73.4.198	10.73.4.199
154	10.73.4.200/29	10.73.4.201 – 10.73.4.206	10.73.4.207
155	10.73.4.208/29	10.73.4.209 – 10.73.4.214	10.73.4.215
156	10.73.4.216/29	10.73.4.217 – 10.73.4.222	10.73.4.223
157	10.73.4.224/29	10.73.4.225 – 10.73.4.230	10.73.4.231
158	10.73.4.232/29	10.73.4.233 – 10.73.4.238	10.73.4.239
159	10.73.4.240/29	10.73.4.241 – 10.73.4.246	10.73.4.247
160	10.73.4.248/29	10.73.4.249 – 10.73.4.254	10.73.4.255
161	10.73.5.0/29	10.73.5.1 – 10.73.5.6	10.73.5.7
162	10.73.5.8/29	10.73.5.9 – 10.73.5.14	10.73.5.15
163	10.73.5.16/29	10.73.5.17 – 10.73.5.22	10.73.5.23
164	10.73.5.24/29	10.73.5.25 – 10.73.5.30	10.73.5.31
165	10.73.5.32/29	10.73.5.33 – 10.73.5.38	10.73.5.39
166	10.73.5.40/29	10.73.5.41 – 10.73.5.46	10.73.5.47
167	10.73.5.48/29	10.73.5.49 – 10.73.5.54	10.73.5.55
168	10.73.5.56/29	10.73.5.57 – 10.73.5.62	10.73.5.63
169	10.73.5.64/29	10.73.5.65 – 10.73.5.70	10.73.5.71
170	10.73.5.72/29	10.73.5.73 – 10.73.5.78	10.73.5.79
171	10.73.5.80/29	10.73.5.81 – 10.73.5.86	10.73.5.87
172	10.73.5.88/29	10.73.5.89 – 10.73.5.94	10.73.5.95
173	10.73.5.96/29	10.73.5.97 – 10.73.5.102	10.73.5.103
174	10.73.5.104/29	10.73.5.105 – 10.73.5.110	10.73.5.111
175	10.73.5.112/29	10.73.5.113 – 10.73.5.118	10.73.5.119
176	10.73.5.120/29	10.73.5.121 – 10.73.5.126	10.73.5.127
177	10.73.5.128/29	10.73.5.129 – 10.73.5.134	10.73.5.135
178	10.73.5.136/29	10.73.5.137 – 10.73.5.142	10.73.5.143
179	10.73.5.144/29	10.73.5.145 – 10.73.5.150	10.73.5.151
180	10.73.5.152/29	10.73.5.153 – 10.73.5.158	10.73.5.159
181	10.73.5.160/29	10.73.5.161 – 10.73.5.166	10.73.5.167
182	10.73.5.168/29	10.73.5.169 – 10.73.5.174	10.73.5.175
183	10.73.5.176/29	10.73.5.177 – 10.73.5.182	10.73.5.183
184	10.73.5.184/29	10.73.5.185 – 10.73.5.190	10.73.5.191
185	10.73.5.192/29	10.73.5.193 – 10.73.5.198	10.73.5.199
186	10.73.5.200/29	10.73.5.201 – 10.73.5.206	10.73.5.207
187	10.73.5.208/29	10.73.5.209 – 10.73.5.214	10.73.5.215
188	10.73.5.216/29	10.73.5.217 – 10.73.5.222	10.73.5.223
189	10.73.5.224/29	10.73.5.225 – 10.73.5.230	10.73.5.231
190	10.73.5.232/29	10.73.5.233 – 10.73.5.238	10.73.5.239
191	10.73.5.240/29	10.73.5.241 – 10.73.5.246	10.73.5.247
192	10.73.5.248/29	10.73.5.249 – 10.73.5.254	10.73.5.255
193	10.73.6.0/29	10.73.6.1 – 10.73.6.6	10.73.6.7
194	10.73.6.8/29	10.73.6.9 – 10.73.6.14	10.73.6.15
195	10.73.6.16/29	10.73.6.17 – 10.73.6.22	10.73.6.23
196	10.73.6.24/29	10.73.6.25 – 10.73.6.30	10.73.6.31
197	10.73.6.32/29	10.73.6.33 – 10.73.6.38	10.73.6.39
198	10.73.6.40/29	10.73.6.41 – 10.73.6.46	10.73.6.47
199	10.73.6.48/29	10.73.6.49 – 10.73.6.54	10.73.6.55
200	10.73.6.56/29	10.73.6.57 – 10.73.6.62	10.73.6.63
201	10.73.6.64/29	10.73.6.65 – 10.73.6.70	10.73.6.71
202	10.73.6.72/29	10.73.6.73 – 10.73.6.78	10.73.6.79
203	10.73.6.80/29	10.73.6.81 – 10.73.6.86	10.73.6.87
204	10.73.6.88/29	10.73.6.89 – 10.73.6.94	10.73.6.95
205	10.73.6.96/29	10.73.6.97 – 10.73.6.102	10.73.6.103
206	10.73.6.104/29	10.73.6.105 – 10.73.6.110	10.73.6.111
207	10.73.6.112/29	10.73.6.113 – 10.73.6.118	10.73.6.119
208	10.73.6.120/29	10.73.6.121 – 10.73.6.126	10.73.6.127
209	10.73.6.128/29	10.73.6.129 – 10.73.6.134	10.73.6.135
210	10.73.6.136/29	10.73.6.137 – 10.73.6.142	10.73.6.143
211	10.73.6.144/29	10.73.6.145 – 10.73.6.150	10.73.6.151
212	10.73.6.152/29	10.73.6.153 – 10.73.6.158	10.73.6.159
213	10.73.6.160/29	10.73.6.161 – 10.73.6.166	10.73.6.167
214	10.73.6.168/29	10.73.6.169 – 10.73.6.174	10.73.6.175
215	10.73.6.176/29	10.73.6.177 – 10.73.6.182	10.73.6.183
216	10.73.6.184/29	10.73.6.185 – 10.73.6.190	10.73.6.191
217	10.73.6.192/29	10.73.6.193 – 10.73.6.198	10.73.6.199
218	10.73.6.200/29	10.73.6.201 – 10.73.6.206	10.73.6.207
219	10.73.6.208/29	10.73.6.209 – 10.73.6.214	10.73.6.215
220	10.73.6.216/29	10.73.6.217 – 10.73.6.222	10.73.6.223
221	10.73.6.224/29	10.73.6.225 – 10.73.6.230	10.73.6.231
222	10.73.6.232/29	10.73.6.233 – 10.73.6.238	10.73.6.239
223	10.73.6.240/29	10.73.6.241 – 10.73.6.246	10.73.6.247
224	10.73.6.248/29	10.73.6.249 – 10.73.6.254	10.73.6.255
225	10.73.7.0/29	10.73.7.1 – 10.73.7.6	10.73.7.7
226	10.73.7.8/29	10.73.7.9 – 10.73.7.14	10.73.7.15
227	10.73.7.16/29	10.73.7.17 – 10.73.7.22	10.73.7.23
228	10.73.7.24/29	10.73.7.25 – 10.73.7.30	10.73.7.31
229	10.73.7.32/29	10.73.7.33 – 10.73.7.38	10.73.7.39
230	10.73.7.40/29	10.73.7.41 – 10.73.7.46	10.73.7.47
231	10.73.7.48/29	10.73.7.49 – 10.73.7.54	10.73.7.55
232	10.73.7.56/29	10.73.7.57 – 10.73.7.62	10.73.7.63
233	10.73.7.64/29	10.73.7.65 – 10.73.7.70	10.73.7.71
234	10.73.7.72/29	10.73.7.73 – 10.73.7.78	10.73.7.79
235	10.73.7.80/29	10.73.7.81 – 10.73.7.86	10.73.7.87
236	10.73.7.88/29	10.73.7.89 – 10.73.7.94	10.73.7.95
237	10.73.7.96/29	10.73.7.97 – 10.73.7.102	10.73.7.103
238	10.73.7.104/29	10.73.7.105 – 10.73.7.110	10.73.7.111
239	10.73.7.112/29	10.73.7.113 – 10.73.7.118	10.73.7.119
240	10.73.7.120/29	10.73.7.121 – 10.73.7.126	10.73.7.127
241	10.73.7.128/29	10.73.7.129 – 10.73.7.134	10.73.7.135
242	10.73.7.136/29	10.73.7.137 – 10.73.7.142	10.73.7.143
243	10.73.7.144/29	10.73.7.145 – 10.73.7.150	10.73.7.151
244	10.73.7.152/29	10.73.7.153 – 10.73.7.158	10.73.7.159
245	10.73.7.160/29	10.73.7.161 – 10.73.7.166	10.73.7.167
246	10.73.7.168/29	10.73.7.169 – 10.73.7.174	10.73.7.175
247	10.73.7.176/29	10.73.7.177 – 10.73.7.182	10.73.7.183
248	10.73.7.184/29	10.73.7.185 – 10.73.7.190	10.73.7.191
249	10.73.7.192/29	10.73.7.193 – 10.73.7.198	10.73.7.199
250	10.73.7.200/29	10.73.7.201 – 10.73.7.206	10.73.7.207
251	10.73.7.208/29	10.73.7.209 – 10.73.7.214	10.73.7.215
252	10.73.7.216/29	10.73.7.217 – 10.73.7.222	10.73.7.223
253	10.73.7.224/29	10.73.7.225 – 10.73.7.230	10.73.7.231
254	10.73.7.232/29	10.73.7.233 – 10.73.7.238	10.73.7.239
255	10.73.7.240/29	10.73.7.241 – 10.73.7.246	10.73.7.247
256	10.73.7.248/29	10.73.7.249 – 10.73.7.254	10.73.7.255

showing 256 of 4,096

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