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)10.0.16.0/20

network10.0.16.0/20

broadcast10.0.31.255

first host10.0.16.1

last host10.0.31.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.0.16.0/20

address00001010.00000000.00010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000000.00010000.00000000

broadcast00001010.00000000.00011111.11111111

green = network part, grey = host part

hex0x0a001000

decimal167776256

reverse dns0.16.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1000

/20 split into /29 · 512 subnets

close ×

#	network	host range	broadcast
1	10.0.16.0/29	10.0.16.1 – 10.0.16.6	10.0.16.7
2	10.0.16.8/29	10.0.16.9 – 10.0.16.14	10.0.16.15
3	10.0.16.16/29	10.0.16.17 – 10.0.16.22	10.0.16.23
4	10.0.16.24/29	10.0.16.25 – 10.0.16.30	10.0.16.31
5	10.0.16.32/29	10.0.16.33 – 10.0.16.38	10.0.16.39
6	10.0.16.40/29	10.0.16.41 – 10.0.16.46	10.0.16.47
7	10.0.16.48/29	10.0.16.49 – 10.0.16.54	10.0.16.55
8	10.0.16.56/29	10.0.16.57 – 10.0.16.62	10.0.16.63
9	10.0.16.64/29	10.0.16.65 – 10.0.16.70	10.0.16.71
10	10.0.16.72/29	10.0.16.73 – 10.0.16.78	10.0.16.79
11	10.0.16.80/29	10.0.16.81 – 10.0.16.86	10.0.16.87
12	10.0.16.88/29	10.0.16.89 – 10.0.16.94	10.0.16.95
13	10.0.16.96/29	10.0.16.97 – 10.0.16.102	10.0.16.103
14	10.0.16.104/29	10.0.16.105 – 10.0.16.110	10.0.16.111
15	10.0.16.112/29	10.0.16.113 – 10.0.16.118	10.0.16.119
16	10.0.16.120/29	10.0.16.121 – 10.0.16.126	10.0.16.127
17	10.0.16.128/29	10.0.16.129 – 10.0.16.134	10.0.16.135
18	10.0.16.136/29	10.0.16.137 – 10.0.16.142	10.0.16.143
19	10.0.16.144/29	10.0.16.145 – 10.0.16.150	10.0.16.151
20	10.0.16.152/29	10.0.16.153 – 10.0.16.158	10.0.16.159
21	10.0.16.160/29	10.0.16.161 – 10.0.16.166	10.0.16.167
22	10.0.16.168/29	10.0.16.169 – 10.0.16.174	10.0.16.175
23	10.0.16.176/29	10.0.16.177 – 10.0.16.182	10.0.16.183
24	10.0.16.184/29	10.0.16.185 – 10.0.16.190	10.0.16.191
25	10.0.16.192/29	10.0.16.193 – 10.0.16.198	10.0.16.199
26	10.0.16.200/29	10.0.16.201 – 10.0.16.206	10.0.16.207
27	10.0.16.208/29	10.0.16.209 – 10.0.16.214	10.0.16.215
28	10.0.16.216/29	10.0.16.217 – 10.0.16.222	10.0.16.223
29	10.0.16.224/29	10.0.16.225 – 10.0.16.230	10.0.16.231
30	10.0.16.232/29	10.0.16.233 – 10.0.16.238	10.0.16.239
31	10.0.16.240/29	10.0.16.241 – 10.0.16.246	10.0.16.247
32	10.0.16.248/29	10.0.16.249 – 10.0.16.254	10.0.16.255
33	10.0.17.0/29	10.0.17.1 – 10.0.17.6	10.0.17.7
34	10.0.17.8/29	10.0.17.9 – 10.0.17.14	10.0.17.15
35	10.0.17.16/29	10.0.17.17 – 10.0.17.22	10.0.17.23
36	10.0.17.24/29	10.0.17.25 – 10.0.17.30	10.0.17.31
37	10.0.17.32/29	10.0.17.33 – 10.0.17.38	10.0.17.39
38	10.0.17.40/29	10.0.17.41 – 10.0.17.46	10.0.17.47
39	10.0.17.48/29	10.0.17.49 – 10.0.17.54	10.0.17.55
40	10.0.17.56/29	10.0.17.57 – 10.0.17.62	10.0.17.63
41	10.0.17.64/29	10.0.17.65 – 10.0.17.70	10.0.17.71
42	10.0.17.72/29	10.0.17.73 – 10.0.17.78	10.0.17.79
43	10.0.17.80/29	10.0.17.81 – 10.0.17.86	10.0.17.87
44	10.0.17.88/29	10.0.17.89 – 10.0.17.94	10.0.17.95
45	10.0.17.96/29	10.0.17.97 – 10.0.17.102	10.0.17.103
46	10.0.17.104/29	10.0.17.105 – 10.0.17.110	10.0.17.111
47	10.0.17.112/29	10.0.17.113 – 10.0.17.118	10.0.17.119
48	10.0.17.120/29	10.0.17.121 – 10.0.17.126	10.0.17.127
49	10.0.17.128/29	10.0.17.129 – 10.0.17.134	10.0.17.135
50	10.0.17.136/29	10.0.17.137 – 10.0.17.142	10.0.17.143
51	10.0.17.144/29	10.0.17.145 – 10.0.17.150	10.0.17.151
52	10.0.17.152/29	10.0.17.153 – 10.0.17.158	10.0.17.159
53	10.0.17.160/29	10.0.17.161 – 10.0.17.166	10.0.17.167
54	10.0.17.168/29	10.0.17.169 – 10.0.17.174	10.0.17.175
55	10.0.17.176/29	10.0.17.177 – 10.0.17.182	10.0.17.183
56	10.0.17.184/29	10.0.17.185 – 10.0.17.190	10.0.17.191
57	10.0.17.192/29	10.0.17.193 – 10.0.17.198	10.0.17.199
58	10.0.17.200/29	10.0.17.201 – 10.0.17.206	10.0.17.207
59	10.0.17.208/29	10.0.17.209 – 10.0.17.214	10.0.17.215
60	10.0.17.216/29	10.0.17.217 – 10.0.17.222	10.0.17.223
61	10.0.17.224/29	10.0.17.225 – 10.0.17.230	10.0.17.231
62	10.0.17.232/29	10.0.17.233 – 10.0.17.238	10.0.17.239
63	10.0.17.240/29	10.0.17.241 – 10.0.17.246	10.0.17.247
64	10.0.17.248/29	10.0.17.249 – 10.0.17.254	10.0.17.255
65	10.0.18.0/29	10.0.18.1 – 10.0.18.6	10.0.18.7
66	10.0.18.8/29	10.0.18.9 – 10.0.18.14	10.0.18.15
67	10.0.18.16/29	10.0.18.17 – 10.0.18.22	10.0.18.23
68	10.0.18.24/29	10.0.18.25 – 10.0.18.30	10.0.18.31
69	10.0.18.32/29	10.0.18.33 – 10.0.18.38	10.0.18.39
70	10.0.18.40/29	10.0.18.41 – 10.0.18.46	10.0.18.47
71	10.0.18.48/29	10.0.18.49 – 10.0.18.54	10.0.18.55
72	10.0.18.56/29	10.0.18.57 – 10.0.18.62	10.0.18.63
73	10.0.18.64/29	10.0.18.65 – 10.0.18.70	10.0.18.71
74	10.0.18.72/29	10.0.18.73 – 10.0.18.78	10.0.18.79
75	10.0.18.80/29	10.0.18.81 – 10.0.18.86	10.0.18.87
76	10.0.18.88/29	10.0.18.89 – 10.0.18.94	10.0.18.95
77	10.0.18.96/29	10.0.18.97 – 10.0.18.102	10.0.18.103
78	10.0.18.104/29	10.0.18.105 – 10.0.18.110	10.0.18.111
79	10.0.18.112/29	10.0.18.113 – 10.0.18.118	10.0.18.119
80	10.0.18.120/29	10.0.18.121 – 10.0.18.126	10.0.18.127
81	10.0.18.128/29	10.0.18.129 – 10.0.18.134	10.0.18.135
82	10.0.18.136/29	10.0.18.137 – 10.0.18.142	10.0.18.143
83	10.0.18.144/29	10.0.18.145 – 10.0.18.150	10.0.18.151
84	10.0.18.152/29	10.0.18.153 – 10.0.18.158	10.0.18.159
85	10.0.18.160/29	10.0.18.161 – 10.0.18.166	10.0.18.167
86	10.0.18.168/29	10.0.18.169 – 10.0.18.174	10.0.18.175
87	10.0.18.176/29	10.0.18.177 – 10.0.18.182	10.0.18.183
88	10.0.18.184/29	10.0.18.185 – 10.0.18.190	10.0.18.191
89	10.0.18.192/29	10.0.18.193 – 10.0.18.198	10.0.18.199
90	10.0.18.200/29	10.0.18.201 – 10.0.18.206	10.0.18.207
91	10.0.18.208/29	10.0.18.209 – 10.0.18.214	10.0.18.215
92	10.0.18.216/29	10.0.18.217 – 10.0.18.222	10.0.18.223
93	10.0.18.224/29	10.0.18.225 – 10.0.18.230	10.0.18.231
94	10.0.18.232/29	10.0.18.233 – 10.0.18.238	10.0.18.239
95	10.0.18.240/29	10.0.18.241 – 10.0.18.246	10.0.18.247
96	10.0.18.248/29	10.0.18.249 – 10.0.18.254	10.0.18.255
97	10.0.19.0/29	10.0.19.1 – 10.0.19.6	10.0.19.7
98	10.0.19.8/29	10.0.19.9 – 10.0.19.14	10.0.19.15
99	10.0.19.16/29	10.0.19.17 – 10.0.19.22	10.0.19.23
100	10.0.19.24/29	10.0.19.25 – 10.0.19.30	10.0.19.31
101	10.0.19.32/29	10.0.19.33 – 10.0.19.38	10.0.19.39
102	10.0.19.40/29	10.0.19.41 – 10.0.19.46	10.0.19.47
103	10.0.19.48/29	10.0.19.49 – 10.0.19.54	10.0.19.55
104	10.0.19.56/29	10.0.19.57 – 10.0.19.62	10.0.19.63
105	10.0.19.64/29	10.0.19.65 – 10.0.19.70	10.0.19.71
106	10.0.19.72/29	10.0.19.73 – 10.0.19.78	10.0.19.79
107	10.0.19.80/29	10.0.19.81 – 10.0.19.86	10.0.19.87
108	10.0.19.88/29	10.0.19.89 – 10.0.19.94	10.0.19.95
109	10.0.19.96/29	10.0.19.97 – 10.0.19.102	10.0.19.103
110	10.0.19.104/29	10.0.19.105 – 10.0.19.110	10.0.19.111
111	10.0.19.112/29	10.0.19.113 – 10.0.19.118	10.0.19.119
112	10.0.19.120/29	10.0.19.121 – 10.0.19.126	10.0.19.127
113	10.0.19.128/29	10.0.19.129 – 10.0.19.134	10.0.19.135
114	10.0.19.136/29	10.0.19.137 – 10.0.19.142	10.0.19.143
115	10.0.19.144/29	10.0.19.145 – 10.0.19.150	10.0.19.151
116	10.0.19.152/29	10.0.19.153 – 10.0.19.158	10.0.19.159
117	10.0.19.160/29	10.0.19.161 – 10.0.19.166	10.0.19.167
118	10.0.19.168/29	10.0.19.169 – 10.0.19.174	10.0.19.175
119	10.0.19.176/29	10.0.19.177 – 10.0.19.182	10.0.19.183
120	10.0.19.184/29	10.0.19.185 – 10.0.19.190	10.0.19.191
121	10.0.19.192/29	10.0.19.193 – 10.0.19.198	10.0.19.199
122	10.0.19.200/29	10.0.19.201 – 10.0.19.206	10.0.19.207
123	10.0.19.208/29	10.0.19.209 – 10.0.19.214	10.0.19.215
124	10.0.19.216/29	10.0.19.217 – 10.0.19.222	10.0.19.223
125	10.0.19.224/29	10.0.19.225 – 10.0.19.230	10.0.19.231
126	10.0.19.232/29	10.0.19.233 – 10.0.19.238	10.0.19.239
127	10.0.19.240/29	10.0.19.241 – 10.0.19.246	10.0.19.247
128	10.0.19.248/29	10.0.19.249 – 10.0.19.254	10.0.19.255
129	10.0.20.0/29	10.0.20.1 – 10.0.20.6	10.0.20.7
130	10.0.20.8/29	10.0.20.9 – 10.0.20.14	10.0.20.15
131	10.0.20.16/29	10.0.20.17 – 10.0.20.22	10.0.20.23
132	10.0.20.24/29	10.0.20.25 – 10.0.20.30	10.0.20.31
133	10.0.20.32/29	10.0.20.33 – 10.0.20.38	10.0.20.39
134	10.0.20.40/29	10.0.20.41 – 10.0.20.46	10.0.20.47
135	10.0.20.48/29	10.0.20.49 – 10.0.20.54	10.0.20.55
136	10.0.20.56/29	10.0.20.57 – 10.0.20.62	10.0.20.63
137	10.0.20.64/29	10.0.20.65 – 10.0.20.70	10.0.20.71
138	10.0.20.72/29	10.0.20.73 – 10.0.20.78	10.0.20.79
139	10.0.20.80/29	10.0.20.81 – 10.0.20.86	10.0.20.87
140	10.0.20.88/29	10.0.20.89 – 10.0.20.94	10.0.20.95
141	10.0.20.96/29	10.0.20.97 – 10.0.20.102	10.0.20.103
142	10.0.20.104/29	10.0.20.105 – 10.0.20.110	10.0.20.111
143	10.0.20.112/29	10.0.20.113 – 10.0.20.118	10.0.20.119
144	10.0.20.120/29	10.0.20.121 – 10.0.20.126	10.0.20.127
145	10.0.20.128/29	10.0.20.129 – 10.0.20.134	10.0.20.135
146	10.0.20.136/29	10.0.20.137 – 10.0.20.142	10.0.20.143
147	10.0.20.144/29	10.0.20.145 – 10.0.20.150	10.0.20.151
148	10.0.20.152/29	10.0.20.153 – 10.0.20.158	10.0.20.159
149	10.0.20.160/29	10.0.20.161 – 10.0.20.166	10.0.20.167
150	10.0.20.168/29	10.0.20.169 – 10.0.20.174	10.0.20.175
151	10.0.20.176/29	10.0.20.177 – 10.0.20.182	10.0.20.183
152	10.0.20.184/29	10.0.20.185 – 10.0.20.190	10.0.20.191
153	10.0.20.192/29	10.0.20.193 – 10.0.20.198	10.0.20.199
154	10.0.20.200/29	10.0.20.201 – 10.0.20.206	10.0.20.207
155	10.0.20.208/29	10.0.20.209 – 10.0.20.214	10.0.20.215
156	10.0.20.216/29	10.0.20.217 – 10.0.20.222	10.0.20.223
157	10.0.20.224/29	10.0.20.225 – 10.0.20.230	10.0.20.231
158	10.0.20.232/29	10.0.20.233 – 10.0.20.238	10.0.20.239
159	10.0.20.240/29	10.0.20.241 – 10.0.20.246	10.0.20.247
160	10.0.20.248/29	10.0.20.249 – 10.0.20.254	10.0.20.255
161	10.0.21.0/29	10.0.21.1 – 10.0.21.6	10.0.21.7
162	10.0.21.8/29	10.0.21.9 – 10.0.21.14	10.0.21.15
163	10.0.21.16/29	10.0.21.17 – 10.0.21.22	10.0.21.23
164	10.0.21.24/29	10.0.21.25 – 10.0.21.30	10.0.21.31
165	10.0.21.32/29	10.0.21.33 – 10.0.21.38	10.0.21.39
166	10.0.21.40/29	10.0.21.41 – 10.0.21.46	10.0.21.47
167	10.0.21.48/29	10.0.21.49 – 10.0.21.54	10.0.21.55
168	10.0.21.56/29	10.0.21.57 – 10.0.21.62	10.0.21.63
169	10.0.21.64/29	10.0.21.65 – 10.0.21.70	10.0.21.71
170	10.0.21.72/29	10.0.21.73 – 10.0.21.78	10.0.21.79
171	10.0.21.80/29	10.0.21.81 – 10.0.21.86	10.0.21.87
172	10.0.21.88/29	10.0.21.89 – 10.0.21.94	10.0.21.95
173	10.0.21.96/29	10.0.21.97 – 10.0.21.102	10.0.21.103
174	10.0.21.104/29	10.0.21.105 – 10.0.21.110	10.0.21.111
175	10.0.21.112/29	10.0.21.113 – 10.0.21.118	10.0.21.119
176	10.0.21.120/29	10.0.21.121 – 10.0.21.126	10.0.21.127
177	10.0.21.128/29	10.0.21.129 – 10.0.21.134	10.0.21.135
178	10.0.21.136/29	10.0.21.137 – 10.0.21.142	10.0.21.143
179	10.0.21.144/29	10.0.21.145 – 10.0.21.150	10.0.21.151
180	10.0.21.152/29	10.0.21.153 – 10.0.21.158	10.0.21.159
181	10.0.21.160/29	10.0.21.161 – 10.0.21.166	10.0.21.167
182	10.0.21.168/29	10.0.21.169 – 10.0.21.174	10.0.21.175
183	10.0.21.176/29	10.0.21.177 – 10.0.21.182	10.0.21.183
184	10.0.21.184/29	10.0.21.185 – 10.0.21.190	10.0.21.191
185	10.0.21.192/29	10.0.21.193 – 10.0.21.198	10.0.21.199
186	10.0.21.200/29	10.0.21.201 – 10.0.21.206	10.0.21.207
187	10.0.21.208/29	10.0.21.209 – 10.0.21.214	10.0.21.215
188	10.0.21.216/29	10.0.21.217 – 10.0.21.222	10.0.21.223
189	10.0.21.224/29	10.0.21.225 – 10.0.21.230	10.0.21.231
190	10.0.21.232/29	10.0.21.233 – 10.0.21.238	10.0.21.239
191	10.0.21.240/29	10.0.21.241 – 10.0.21.246	10.0.21.247
192	10.0.21.248/29	10.0.21.249 – 10.0.21.254	10.0.21.255
193	10.0.22.0/29	10.0.22.1 – 10.0.22.6	10.0.22.7
194	10.0.22.8/29	10.0.22.9 – 10.0.22.14	10.0.22.15
195	10.0.22.16/29	10.0.22.17 – 10.0.22.22	10.0.22.23
196	10.0.22.24/29	10.0.22.25 – 10.0.22.30	10.0.22.31
197	10.0.22.32/29	10.0.22.33 – 10.0.22.38	10.0.22.39
198	10.0.22.40/29	10.0.22.41 – 10.0.22.46	10.0.22.47
199	10.0.22.48/29	10.0.22.49 – 10.0.22.54	10.0.22.55
200	10.0.22.56/29	10.0.22.57 – 10.0.22.62	10.0.22.63
201	10.0.22.64/29	10.0.22.65 – 10.0.22.70	10.0.22.71
202	10.0.22.72/29	10.0.22.73 – 10.0.22.78	10.0.22.79
203	10.0.22.80/29	10.0.22.81 – 10.0.22.86	10.0.22.87
204	10.0.22.88/29	10.0.22.89 – 10.0.22.94	10.0.22.95
205	10.0.22.96/29	10.0.22.97 – 10.0.22.102	10.0.22.103
206	10.0.22.104/29	10.0.22.105 – 10.0.22.110	10.0.22.111
207	10.0.22.112/29	10.0.22.113 – 10.0.22.118	10.0.22.119
208	10.0.22.120/29	10.0.22.121 – 10.0.22.126	10.0.22.127
209	10.0.22.128/29	10.0.22.129 – 10.0.22.134	10.0.22.135
210	10.0.22.136/29	10.0.22.137 – 10.0.22.142	10.0.22.143
211	10.0.22.144/29	10.0.22.145 – 10.0.22.150	10.0.22.151
212	10.0.22.152/29	10.0.22.153 – 10.0.22.158	10.0.22.159
213	10.0.22.160/29	10.0.22.161 – 10.0.22.166	10.0.22.167
214	10.0.22.168/29	10.0.22.169 – 10.0.22.174	10.0.22.175
215	10.0.22.176/29	10.0.22.177 – 10.0.22.182	10.0.22.183
216	10.0.22.184/29	10.0.22.185 – 10.0.22.190	10.0.22.191
217	10.0.22.192/29	10.0.22.193 – 10.0.22.198	10.0.22.199
218	10.0.22.200/29	10.0.22.201 – 10.0.22.206	10.0.22.207
219	10.0.22.208/29	10.0.22.209 – 10.0.22.214	10.0.22.215
220	10.0.22.216/29	10.0.22.217 – 10.0.22.222	10.0.22.223
221	10.0.22.224/29	10.0.22.225 – 10.0.22.230	10.0.22.231
222	10.0.22.232/29	10.0.22.233 – 10.0.22.238	10.0.22.239
223	10.0.22.240/29	10.0.22.241 – 10.0.22.246	10.0.22.247
224	10.0.22.248/29	10.0.22.249 – 10.0.22.254	10.0.22.255
225	10.0.23.0/29	10.0.23.1 – 10.0.23.6	10.0.23.7
226	10.0.23.8/29	10.0.23.9 – 10.0.23.14	10.0.23.15
227	10.0.23.16/29	10.0.23.17 – 10.0.23.22	10.0.23.23
228	10.0.23.24/29	10.0.23.25 – 10.0.23.30	10.0.23.31
229	10.0.23.32/29	10.0.23.33 – 10.0.23.38	10.0.23.39
230	10.0.23.40/29	10.0.23.41 – 10.0.23.46	10.0.23.47
231	10.0.23.48/29	10.0.23.49 – 10.0.23.54	10.0.23.55
232	10.0.23.56/29	10.0.23.57 – 10.0.23.62	10.0.23.63
233	10.0.23.64/29	10.0.23.65 – 10.0.23.70	10.0.23.71
234	10.0.23.72/29	10.0.23.73 – 10.0.23.78	10.0.23.79
235	10.0.23.80/29	10.0.23.81 – 10.0.23.86	10.0.23.87
236	10.0.23.88/29	10.0.23.89 – 10.0.23.94	10.0.23.95
237	10.0.23.96/29	10.0.23.97 – 10.0.23.102	10.0.23.103
238	10.0.23.104/29	10.0.23.105 – 10.0.23.110	10.0.23.111
239	10.0.23.112/29	10.0.23.113 – 10.0.23.118	10.0.23.119
240	10.0.23.120/29	10.0.23.121 – 10.0.23.126	10.0.23.127
241	10.0.23.128/29	10.0.23.129 – 10.0.23.134	10.0.23.135
242	10.0.23.136/29	10.0.23.137 – 10.0.23.142	10.0.23.143
243	10.0.23.144/29	10.0.23.145 – 10.0.23.150	10.0.23.151
244	10.0.23.152/29	10.0.23.153 – 10.0.23.158	10.0.23.159
245	10.0.23.160/29	10.0.23.161 – 10.0.23.166	10.0.23.167
246	10.0.23.168/29	10.0.23.169 – 10.0.23.174	10.0.23.175
247	10.0.23.176/29	10.0.23.177 – 10.0.23.182	10.0.23.183
248	10.0.23.184/29	10.0.23.185 – 10.0.23.190	10.0.23.191
249	10.0.23.192/29	10.0.23.193 – 10.0.23.198	10.0.23.199
250	10.0.23.200/29	10.0.23.201 – 10.0.23.206	10.0.23.207
251	10.0.23.208/29	10.0.23.209 – 10.0.23.214	10.0.23.215
252	10.0.23.216/29	10.0.23.217 – 10.0.23.222	10.0.23.223
253	10.0.23.224/29	10.0.23.225 – 10.0.23.230	10.0.23.231
254	10.0.23.232/29	10.0.23.233 – 10.0.23.238	10.0.23.239
255	10.0.23.240/29	10.0.23.241 – 10.0.23.246	10.0.23.247
256	10.0.23.248/29	10.0.23.249 – 10.0.23.254	10.0.23.255

showing 256 of 512

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