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)10.12.96.0/19

network10.12.96.0/19

broadcast10.12.127.255

first host10.12.96.1

last host10.12.127.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.12.96.0/19

address00001010.00001100.01100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00001100.01100000.00000000

broadcast00001010.00001100.01111111.11111111

green = network part, grey = host part

hex0x0a0c6000

decimal168583168

reverse dns0.96.12.10.in-addr.arpa

ipv4-mapped::ffff:a0c:6000

/19 split into /29 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.12.96.0/29	10.12.96.1 – 10.12.96.6	10.12.96.7
2	10.12.96.8/29	10.12.96.9 – 10.12.96.14	10.12.96.15
3	10.12.96.16/29	10.12.96.17 – 10.12.96.22	10.12.96.23
4	10.12.96.24/29	10.12.96.25 – 10.12.96.30	10.12.96.31
5	10.12.96.32/29	10.12.96.33 – 10.12.96.38	10.12.96.39
6	10.12.96.40/29	10.12.96.41 – 10.12.96.46	10.12.96.47
7	10.12.96.48/29	10.12.96.49 – 10.12.96.54	10.12.96.55
8	10.12.96.56/29	10.12.96.57 – 10.12.96.62	10.12.96.63
9	10.12.96.64/29	10.12.96.65 – 10.12.96.70	10.12.96.71
10	10.12.96.72/29	10.12.96.73 – 10.12.96.78	10.12.96.79
11	10.12.96.80/29	10.12.96.81 – 10.12.96.86	10.12.96.87
12	10.12.96.88/29	10.12.96.89 – 10.12.96.94	10.12.96.95
13	10.12.96.96/29	10.12.96.97 – 10.12.96.102	10.12.96.103
14	10.12.96.104/29	10.12.96.105 – 10.12.96.110	10.12.96.111
15	10.12.96.112/29	10.12.96.113 – 10.12.96.118	10.12.96.119
16	10.12.96.120/29	10.12.96.121 – 10.12.96.126	10.12.96.127
17	10.12.96.128/29	10.12.96.129 – 10.12.96.134	10.12.96.135
18	10.12.96.136/29	10.12.96.137 – 10.12.96.142	10.12.96.143
19	10.12.96.144/29	10.12.96.145 – 10.12.96.150	10.12.96.151
20	10.12.96.152/29	10.12.96.153 – 10.12.96.158	10.12.96.159
21	10.12.96.160/29	10.12.96.161 – 10.12.96.166	10.12.96.167
22	10.12.96.168/29	10.12.96.169 – 10.12.96.174	10.12.96.175
23	10.12.96.176/29	10.12.96.177 – 10.12.96.182	10.12.96.183
24	10.12.96.184/29	10.12.96.185 – 10.12.96.190	10.12.96.191
25	10.12.96.192/29	10.12.96.193 – 10.12.96.198	10.12.96.199
26	10.12.96.200/29	10.12.96.201 – 10.12.96.206	10.12.96.207
27	10.12.96.208/29	10.12.96.209 – 10.12.96.214	10.12.96.215
28	10.12.96.216/29	10.12.96.217 – 10.12.96.222	10.12.96.223
29	10.12.96.224/29	10.12.96.225 – 10.12.96.230	10.12.96.231
30	10.12.96.232/29	10.12.96.233 – 10.12.96.238	10.12.96.239
31	10.12.96.240/29	10.12.96.241 – 10.12.96.246	10.12.96.247
32	10.12.96.248/29	10.12.96.249 – 10.12.96.254	10.12.96.255
33	10.12.97.0/29	10.12.97.1 – 10.12.97.6	10.12.97.7
34	10.12.97.8/29	10.12.97.9 – 10.12.97.14	10.12.97.15
35	10.12.97.16/29	10.12.97.17 – 10.12.97.22	10.12.97.23
36	10.12.97.24/29	10.12.97.25 – 10.12.97.30	10.12.97.31
37	10.12.97.32/29	10.12.97.33 – 10.12.97.38	10.12.97.39
38	10.12.97.40/29	10.12.97.41 – 10.12.97.46	10.12.97.47
39	10.12.97.48/29	10.12.97.49 – 10.12.97.54	10.12.97.55
40	10.12.97.56/29	10.12.97.57 – 10.12.97.62	10.12.97.63
41	10.12.97.64/29	10.12.97.65 – 10.12.97.70	10.12.97.71
42	10.12.97.72/29	10.12.97.73 – 10.12.97.78	10.12.97.79
43	10.12.97.80/29	10.12.97.81 – 10.12.97.86	10.12.97.87
44	10.12.97.88/29	10.12.97.89 – 10.12.97.94	10.12.97.95
45	10.12.97.96/29	10.12.97.97 – 10.12.97.102	10.12.97.103
46	10.12.97.104/29	10.12.97.105 – 10.12.97.110	10.12.97.111
47	10.12.97.112/29	10.12.97.113 – 10.12.97.118	10.12.97.119
48	10.12.97.120/29	10.12.97.121 – 10.12.97.126	10.12.97.127
49	10.12.97.128/29	10.12.97.129 – 10.12.97.134	10.12.97.135
50	10.12.97.136/29	10.12.97.137 – 10.12.97.142	10.12.97.143
51	10.12.97.144/29	10.12.97.145 – 10.12.97.150	10.12.97.151
52	10.12.97.152/29	10.12.97.153 – 10.12.97.158	10.12.97.159
53	10.12.97.160/29	10.12.97.161 – 10.12.97.166	10.12.97.167
54	10.12.97.168/29	10.12.97.169 – 10.12.97.174	10.12.97.175
55	10.12.97.176/29	10.12.97.177 – 10.12.97.182	10.12.97.183
56	10.12.97.184/29	10.12.97.185 – 10.12.97.190	10.12.97.191
57	10.12.97.192/29	10.12.97.193 – 10.12.97.198	10.12.97.199
58	10.12.97.200/29	10.12.97.201 – 10.12.97.206	10.12.97.207
59	10.12.97.208/29	10.12.97.209 – 10.12.97.214	10.12.97.215
60	10.12.97.216/29	10.12.97.217 – 10.12.97.222	10.12.97.223
61	10.12.97.224/29	10.12.97.225 – 10.12.97.230	10.12.97.231
62	10.12.97.232/29	10.12.97.233 – 10.12.97.238	10.12.97.239
63	10.12.97.240/29	10.12.97.241 – 10.12.97.246	10.12.97.247
64	10.12.97.248/29	10.12.97.249 – 10.12.97.254	10.12.97.255
65	10.12.98.0/29	10.12.98.1 – 10.12.98.6	10.12.98.7
66	10.12.98.8/29	10.12.98.9 – 10.12.98.14	10.12.98.15
67	10.12.98.16/29	10.12.98.17 – 10.12.98.22	10.12.98.23
68	10.12.98.24/29	10.12.98.25 – 10.12.98.30	10.12.98.31
69	10.12.98.32/29	10.12.98.33 – 10.12.98.38	10.12.98.39
70	10.12.98.40/29	10.12.98.41 – 10.12.98.46	10.12.98.47
71	10.12.98.48/29	10.12.98.49 – 10.12.98.54	10.12.98.55
72	10.12.98.56/29	10.12.98.57 – 10.12.98.62	10.12.98.63
73	10.12.98.64/29	10.12.98.65 – 10.12.98.70	10.12.98.71
74	10.12.98.72/29	10.12.98.73 – 10.12.98.78	10.12.98.79
75	10.12.98.80/29	10.12.98.81 – 10.12.98.86	10.12.98.87
76	10.12.98.88/29	10.12.98.89 – 10.12.98.94	10.12.98.95
77	10.12.98.96/29	10.12.98.97 – 10.12.98.102	10.12.98.103
78	10.12.98.104/29	10.12.98.105 – 10.12.98.110	10.12.98.111
79	10.12.98.112/29	10.12.98.113 – 10.12.98.118	10.12.98.119
80	10.12.98.120/29	10.12.98.121 – 10.12.98.126	10.12.98.127
81	10.12.98.128/29	10.12.98.129 – 10.12.98.134	10.12.98.135
82	10.12.98.136/29	10.12.98.137 – 10.12.98.142	10.12.98.143
83	10.12.98.144/29	10.12.98.145 – 10.12.98.150	10.12.98.151
84	10.12.98.152/29	10.12.98.153 – 10.12.98.158	10.12.98.159
85	10.12.98.160/29	10.12.98.161 – 10.12.98.166	10.12.98.167
86	10.12.98.168/29	10.12.98.169 – 10.12.98.174	10.12.98.175
87	10.12.98.176/29	10.12.98.177 – 10.12.98.182	10.12.98.183
88	10.12.98.184/29	10.12.98.185 – 10.12.98.190	10.12.98.191
89	10.12.98.192/29	10.12.98.193 – 10.12.98.198	10.12.98.199
90	10.12.98.200/29	10.12.98.201 – 10.12.98.206	10.12.98.207
91	10.12.98.208/29	10.12.98.209 – 10.12.98.214	10.12.98.215
92	10.12.98.216/29	10.12.98.217 – 10.12.98.222	10.12.98.223
93	10.12.98.224/29	10.12.98.225 – 10.12.98.230	10.12.98.231
94	10.12.98.232/29	10.12.98.233 – 10.12.98.238	10.12.98.239
95	10.12.98.240/29	10.12.98.241 – 10.12.98.246	10.12.98.247
96	10.12.98.248/29	10.12.98.249 – 10.12.98.254	10.12.98.255
97	10.12.99.0/29	10.12.99.1 – 10.12.99.6	10.12.99.7
98	10.12.99.8/29	10.12.99.9 – 10.12.99.14	10.12.99.15
99	10.12.99.16/29	10.12.99.17 – 10.12.99.22	10.12.99.23
100	10.12.99.24/29	10.12.99.25 – 10.12.99.30	10.12.99.31
101	10.12.99.32/29	10.12.99.33 – 10.12.99.38	10.12.99.39
102	10.12.99.40/29	10.12.99.41 – 10.12.99.46	10.12.99.47
103	10.12.99.48/29	10.12.99.49 – 10.12.99.54	10.12.99.55
104	10.12.99.56/29	10.12.99.57 – 10.12.99.62	10.12.99.63
105	10.12.99.64/29	10.12.99.65 – 10.12.99.70	10.12.99.71
106	10.12.99.72/29	10.12.99.73 – 10.12.99.78	10.12.99.79
107	10.12.99.80/29	10.12.99.81 – 10.12.99.86	10.12.99.87
108	10.12.99.88/29	10.12.99.89 – 10.12.99.94	10.12.99.95
109	10.12.99.96/29	10.12.99.97 – 10.12.99.102	10.12.99.103
110	10.12.99.104/29	10.12.99.105 – 10.12.99.110	10.12.99.111
111	10.12.99.112/29	10.12.99.113 – 10.12.99.118	10.12.99.119
112	10.12.99.120/29	10.12.99.121 – 10.12.99.126	10.12.99.127
113	10.12.99.128/29	10.12.99.129 – 10.12.99.134	10.12.99.135
114	10.12.99.136/29	10.12.99.137 – 10.12.99.142	10.12.99.143
115	10.12.99.144/29	10.12.99.145 – 10.12.99.150	10.12.99.151
116	10.12.99.152/29	10.12.99.153 – 10.12.99.158	10.12.99.159
117	10.12.99.160/29	10.12.99.161 – 10.12.99.166	10.12.99.167
118	10.12.99.168/29	10.12.99.169 – 10.12.99.174	10.12.99.175
119	10.12.99.176/29	10.12.99.177 – 10.12.99.182	10.12.99.183
120	10.12.99.184/29	10.12.99.185 – 10.12.99.190	10.12.99.191
121	10.12.99.192/29	10.12.99.193 – 10.12.99.198	10.12.99.199
122	10.12.99.200/29	10.12.99.201 – 10.12.99.206	10.12.99.207
123	10.12.99.208/29	10.12.99.209 – 10.12.99.214	10.12.99.215
124	10.12.99.216/29	10.12.99.217 – 10.12.99.222	10.12.99.223
125	10.12.99.224/29	10.12.99.225 – 10.12.99.230	10.12.99.231
126	10.12.99.232/29	10.12.99.233 – 10.12.99.238	10.12.99.239
127	10.12.99.240/29	10.12.99.241 – 10.12.99.246	10.12.99.247
128	10.12.99.248/29	10.12.99.249 – 10.12.99.254	10.12.99.255
129	10.12.100.0/29	10.12.100.1 – 10.12.100.6	10.12.100.7
130	10.12.100.8/29	10.12.100.9 – 10.12.100.14	10.12.100.15
131	10.12.100.16/29	10.12.100.17 – 10.12.100.22	10.12.100.23
132	10.12.100.24/29	10.12.100.25 – 10.12.100.30	10.12.100.31
133	10.12.100.32/29	10.12.100.33 – 10.12.100.38	10.12.100.39
134	10.12.100.40/29	10.12.100.41 – 10.12.100.46	10.12.100.47
135	10.12.100.48/29	10.12.100.49 – 10.12.100.54	10.12.100.55
136	10.12.100.56/29	10.12.100.57 – 10.12.100.62	10.12.100.63
137	10.12.100.64/29	10.12.100.65 – 10.12.100.70	10.12.100.71
138	10.12.100.72/29	10.12.100.73 – 10.12.100.78	10.12.100.79
139	10.12.100.80/29	10.12.100.81 – 10.12.100.86	10.12.100.87
140	10.12.100.88/29	10.12.100.89 – 10.12.100.94	10.12.100.95
141	10.12.100.96/29	10.12.100.97 – 10.12.100.102	10.12.100.103
142	10.12.100.104/29	10.12.100.105 – 10.12.100.110	10.12.100.111
143	10.12.100.112/29	10.12.100.113 – 10.12.100.118	10.12.100.119
144	10.12.100.120/29	10.12.100.121 – 10.12.100.126	10.12.100.127
145	10.12.100.128/29	10.12.100.129 – 10.12.100.134	10.12.100.135
146	10.12.100.136/29	10.12.100.137 – 10.12.100.142	10.12.100.143
147	10.12.100.144/29	10.12.100.145 – 10.12.100.150	10.12.100.151
148	10.12.100.152/29	10.12.100.153 – 10.12.100.158	10.12.100.159
149	10.12.100.160/29	10.12.100.161 – 10.12.100.166	10.12.100.167
150	10.12.100.168/29	10.12.100.169 – 10.12.100.174	10.12.100.175
151	10.12.100.176/29	10.12.100.177 – 10.12.100.182	10.12.100.183
152	10.12.100.184/29	10.12.100.185 – 10.12.100.190	10.12.100.191
153	10.12.100.192/29	10.12.100.193 – 10.12.100.198	10.12.100.199
154	10.12.100.200/29	10.12.100.201 – 10.12.100.206	10.12.100.207
155	10.12.100.208/29	10.12.100.209 – 10.12.100.214	10.12.100.215
156	10.12.100.216/29	10.12.100.217 – 10.12.100.222	10.12.100.223
157	10.12.100.224/29	10.12.100.225 – 10.12.100.230	10.12.100.231
158	10.12.100.232/29	10.12.100.233 – 10.12.100.238	10.12.100.239
159	10.12.100.240/29	10.12.100.241 – 10.12.100.246	10.12.100.247
160	10.12.100.248/29	10.12.100.249 – 10.12.100.254	10.12.100.255
161	10.12.101.0/29	10.12.101.1 – 10.12.101.6	10.12.101.7
162	10.12.101.8/29	10.12.101.9 – 10.12.101.14	10.12.101.15
163	10.12.101.16/29	10.12.101.17 – 10.12.101.22	10.12.101.23
164	10.12.101.24/29	10.12.101.25 – 10.12.101.30	10.12.101.31
165	10.12.101.32/29	10.12.101.33 – 10.12.101.38	10.12.101.39
166	10.12.101.40/29	10.12.101.41 – 10.12.101.46	10.12.101.47
167	10.12.101.48/29	10.12.101.49 – 10.12.101.54	10.12.101.55
168	10.12.101.56/29	10.12.101.57 – 10.12.101.62	10.12.101.63
169	10.12.101.64/29	10.12.101.65 – 10.12.101.70	10.12.101.71
170	10.12.101.72/29	10.12.101.73 – 10.12.101.78	10.12.101.79
171	10.12.101.80/29	10.12.101.81 – 10.12.101.86	10.12.101.87
172	10.12.101.88/29	10.12.101.89 – 10.12.101.94	10.12.101.95
173	10.12.101.96/29	10.12.101.97 – 10.12.101.102	10.12.101.103
174	10.12.101.104/29	10.12.101.105 – 10.12.101.110	10.12.101.111
175	10.12.101.112/29	10.12.101.113 – 10.12.101.118	10.12.101.119
176	10.12.101.120/29	10.12.101.121 – 10.12.101.126	10.12.101.127
177	10.12.101.128/29	10.12.101.129 – 10.12.101.134	10.12.101.135
178	10.12.101.136/29	10.12.101.137 – 10.12.101.142	10.12.101.143
179	10.12.101.144/29	10.12.101.145 – 10.12.101.150	10.12.101.151
180	10.12.101.152/29	10.12.101.153 – 10.12.101.158	10.12.101.159
181	10.12.101.160/29	10.12.101.161 – 10.12.101.166	10.12.101.167
182	10.12.101.168/29	10.12.101.169 – 10.12.101.174	10.12.101.175
183	10.12.101.176/29	10.12.101.177 – 10.12.101.182	10.12.101.183
184	10.12.101.184/29	10.12.101.185 – 10.12.101.190	10.12.101.191
185	10.12.101.192/29	10.12.101.193 – 10.12.101.198	10.12.101.199
186	10.12.101.200/29	10.12.101.201 – 10.12.101.206	10.12.101.207
187	10.12.101.208/29	10.12.101.209 – 10.12.101.214	10.12.101.215
188	10.12.101.216/29	10.12.101.217 – 10.12.101.222	10.12.101.223
189	10.12.101.224/29	10.12.101.225 – 10.12.101.230	10.12.101.231
190	10.12.101.232/29	10.12.101.233 – 10.12.101.238	10.12.101.239
191	10.12.101.240/29	10.12.101.241 – 10.12.101.246	10.12.101.247
192	10.12.101.248/29	10.12.101.249 – 10.12.101.254	10.12.101.255
193	10.12.102.0/29	10.12.102.1 – 10.12.102.6	10.12.102.7
194	10.12.102.8/29	10.12.102.9 – 10.12.102.14	10.12.102.15
195	10.12.102.16/29	10.12.102.17 – 10.12.102.22	10.12.102.23
196	10.12.102.24/29	10.12.102.25 – 10.12.102.30	10.12.102.31
197	10.12.102.32/29	10.12.102.33 – 10.12.102.38	10.12.102.39
198	10.12.102.40/29	10.12.102.41 – 10.12.102.46	10.12.102.47
199	10.12.102.48/29	10.12.102.49 – 10.12.102.54	10.12.102.55
200	10.12.102.56/29	10.12.102.57 – 10.12.102.62	10.12.102.63
201	10.12.102.64/29	10.12.102.65 – 10.12.102.70	10.12.102.71
202	10.12.102.72/29	10.12.102.73 – 10.12.102.78	10.12.102.79
203	10.12.102.80/29	10.12.102.81 – 10.12.102.86	10.12.102.87
204	10.12.102.88/29	10.12.102.89 – 10.12.102.94	10.12.102.95
205	10.12.102.96/29	10.12.102.97 – 10.12.102.102	10.12.102.103
206	10.12.102.104/29	10.12.102.105 – 10.12.102.110	10.12.102.111
207	10.12.102.112/29	10.12.102.113 – 10.12.102.118	10.12.102.119
208	10.12.102.120/29	10.12.102.121 – 10.12.102.126	10.12.102.127
209	10.12.102.128/29	10.12.102.129 – 10.12.102.134	10.12.102.135
210	10.12.102.136/29	10.12.102.137 – 10.12.102.142	10.12.102.143
211	10.12.102.144/29	10.12.102.145 – 10.12.102.150	10.12.102.151
212	10.12.102.152/29	10.12.102.153 – 10.12.102.158	10.12.102.159
213	10.12.102.160/29	10.12.102.161 – 10.12.102.166	10.12.102.167
214	10.12.102.168/29	10.12.102.169 – 10.12.102.174	10.12.102.175
215	10.12.102.176/29	10.12.102.177 – 10.12.102.182	10.12.102.183
216	10.12.102.184/29	10.12.102.185 – 10.12.102.190	10.12.102.191
217	10.12.102.192/29	10.12.102.193 – 10.12.102.198	10.12.102.199
218	10.12.102.200/29	10.12.102.201 – 10.12.102.206	10.12.102.207
219	10.12.102.208/29	10.12.102.209 – 10.12.102.214	10.12.102.215
220	10.12.102.216/29	10.12.102.217 – 10.12.102.222	10.12.102.223
221	10.12.102.224/29	10.12.102.225 – 10.12.102.230	10.12.102.231
222	10.12.102.232/29	10.12.102.233 – 10.12.102.238	10.12.102.239
223	10.12.102.240/29	10.12.102.241 – 10.12.102.246	10.12.102.247
224	10.12.102.248/29	10.12.102.249 – 10.12.102.254	10.12.102.255
225	10.12.103.0/29	10.12.103.1 – 10.12.103.6	10.12.103.7
226	10.12.103.8/29	10.12.103.9 – 10.12.103.14	10.12.103.15
227	10.12.103.16/29	10.12.103.17 – 10.12.103.22	10.12.103.23
228	10.12.103.24/29	10.12.103.25 – 10.12.103.30	10.12.103.31
229	10.12.103.32/29	10.12.103.33 – 10.12.103.38	10.12.103.39
230	10.12.103.40/29	10.12.103.41 – 10.12.103.46	10.12.103.47
231	10.12.103.48/29	10.12.103.49 – 10.12.103.54	10.12.103.55
232	10.12.103.56/29	10.12.103.57 – 10.12.103.62	10.12.103.63
233	10.12.103.64/29	10.12.103.65 – 10.12.103.70	10.12.103.71
234	10.12.103.72/29	10.12.103.73 – 10.12.103.78	10.12.103.79
235	10.12.103.80/29	10.12.103.81 – 10.12.103.86	10.12.103.87
236	10.12.103.88/29	10.12.103.89 – 10.12.103.94	10.12.103.95
237	10.12.103.96/29	10.12.103.97 – 10.12.103.102	10.12.103.103
238	10.12.103.104/29	10.12.103.105 – 10.12.103.110	10.12.103.111
239	10.12.103.112/29	10.12.103.113 – 10.12.103.118	10.12.103.119
240	10.12.103.120/29	10.12.103.121 – 10.12.103.126	10.12.103.127
241	10.12.103.128/29	10.12.103.129 – 10.12.103.134	10.12.103.135
242	10.12.103.136/29	10.12.103.137 – 10.12.103.142	10.12.103.143
243	10.12.103.144/29	10.12.103.145 – 10.12.103.150	10.12.103.151
244	10.12.103.152/29	10.12.103.153 – 10.12.103.158	10.12.103.159
245	10.12.103.160/29	10.12.103.161 – 10.12.103.166	10.12.103.167
246	10.12.103.168/29	10.12.103.169 – 10.12.103.174	10.12.103.175
247	10.12.103.176/29	10.12.103.177 – 10.12.103.182	10.12.103.183
248	10.12.103.184/29	10.12.103.185 – 10.12.103.190	10.12.103.191
249	10.12.103.192/29	10.12.103.193 – 10.12.103.198	10.12.103.199
250	10.12.103.200/29	10.12.103.201 – 10.12.103.206	10.12.103.207
251	10.12.103.208/29	10.12.103.209 – 10.12.103.214	10.12.103.215
252	10.12.103.216/29	10.12.103.217 – 10.12.103.222	10.12.103.223
253	10.12.103.224/29	10.12.103.225 – 10.12.103.230	10.12.103.231
254	10.12.103.232/29	10.12.103.233 – 10.12.103.238	10.12.103.239
255	10.12.103.240/29	10.12.103.241 – 10.12.103.246	10.12.103.247
256	10.12.103.248/29	10.12.103.249 – 10.12.103.254	10.12.103.255

showing 256 of 1,024

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