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)10.121.0.0/16

network10.121.0.0/16

broadcast10.121.255.255

first host10.121.0.1

last host10.121.255.254

subnet mask255.255.0.0

wildcard0.0.255.255

addresses65,536

usable hosts65,534

classA

ipcalc 10.121.0.0/16

address00001010.01111001.00000000.00000000

subnet mask11111111.11111111.00000000.00000000

network00001010.01111001.00000000.00000000

broadcast00001010.01111001.11111111.11111111

green = network part, grey = host part

hex0x0a790000

decimal175702016

reverse dns0.0.121.10.in-addr.arpa

ipv4-mapped::ffff:a79:0

/16 split into /29 · 8,192 subnets

close ×

#	network	host range	broadcast
1	10.121.0.0/29	10.121.0.1 – 10.121.0.6	10.121.0.7
2	10.121.0.8/29	10.121.0.9 – 10.121.0.14	10.121.0.15
3	10.121.0.16/29	10.121.0.17 – 10.121.0.22	10.121.0.23
4	10.121.0.24/29	10.121.0.25 – 10.121.0.30	10.121.0.31
5	10.121.0.32/29	10.121.0.33 – 10.121.0.38	10.121.0.39
6	10.121.0.40/29	10.121.0.41 – 10.121.0.46	10.121.0.47
7	10.121.0.48/29	10.121.0.49 – 10.121.0.54	10.121.0.55
8	10.121.0.56/29	10.121.0.57 – 10.121.0.62	10.121.0.63
9	10.121.0.64/29	10.121.0.65 – 10.121.0.70	10.121.0.71
10	10.121.0.72/29	10.121.0.73 – 10.121.0.78	10.121.0.79
11	10.121.0.80/29	10.121.0.81 – 10.121.0.86	10.121.0.87
12	10.121.0.88/29	10.121.0.89 – 10.121.0.94	10.121.0.95
13	10.121.0.96/29	10.121.0.97 – 10.121.0.102	10.121.0.103
14	10.121.0.104/29	10.121.0.105 – 10.121.0.110	10.121.0.111
15	10.121.0.112/29	10.121.0.113 – 10.121.0.118	10.121.0.119
16	10.121.0.120/29	10.121.0.121 – 10.121.0.126	10.121.0.127
17	10.121.0.128/29	10.121.0.129 – 10.121.0.134	10.121.0.135
18	10.121.0.136/29	10.121.0.137 – 10.121.0.142	10.121.0.143
19	10.121.0.144/29	10.121.0.145 – 10.121.0.150	10.121.0.151
20	10.121.0.152/29	10.121.0.153 – 10.121.0.158	10.121.0.159
21	10.121.0.160/29	10.121.0.161 – 10.121.0.166	10.121.0.167
22	10.121.0.168/29	10.121.0.169 – 10.121.0.174	10.121.0.175
23	10.121.0.176/29	10.121.0.177 – 10.121.0.182	10.121.0.183
24	10.121.0.184/29	10.121.0.185 – 10.121.0.190	10.121.0.191
25	10.121.0.192/29	10.121.0.193 – 10.121.0.198	10.121.0.199
26	10.121.0.200/29	10.121.0.201 – 10.121.0.206	10.121.0.207
27	10.121.0.208/29	10.121.0.209 – 10.121.0.214	10.121.0.215
28	10.121.0.216/29	10.121.0.217 – 10.121.0.222	10.121.0.223
29	10.121.0.224/29	10.121.0.225 – 10.121.0.230	10.121.0.231
30	10.121.0.232/29	10.121.0.233 – 10.121.0.238	10.121.0.239
31	10.121.0.240/29	10.121.0.241 – 10.121.0.246	10.121.0.247
32	10.121.0.248/29	10.121.0.249 – 10.121.0.254	10.121.0.255
33	10.121.1.0/29	10.121.1.1 – 10.121.1.6	10.121.1.7
34	10.121.1.8/29	10.121.1.9 – 10.121.1.14	10.121.1.15
35	10.121.1.16/29	10.121.1.17 – 10.121.1.22	10.121.1.23
36	10.121.1.24/29	10.121.1.25 – 10.121.1.30	10.121.1.31
37	10.121.1.32/29	10.121.1.33 – 10.121.1.38	10.121.1.39
38	10.121.1.40/29	10.121.1.41 – 10.121.1.46	10.121.1.47
39	10.121.1.48/29	10.121.1.49 – 10.121.1.54	10.121.1.55
40	10.121.1.56/29	10.121.1.57 – 10.121.1.62	10.121.1.63
41	10.121.1.64/29	10.121.1.65 – 10.121.1.70	10.121.1.71
42	10.121.1.72/29	10.121.1.73 – 10.121.1.78	10.121.1.79
43	10.121.1.80/29	10.121.1.81 – 10.121.1.86	10.121.1.87
44	10.121.1.88/29	10.121.1.89 – 10.121.1.94	10.121.1.95
45	10.121.1.96/29	10.121.1.97 – 10.121.1.102	10.121.1.103
46	10.121.1.104/29	10.121.1.105 – 10.121.1.110	10.121.1.111
47	10.121.1.112/29	10.121.1.113 – 10.121.1.118	10.121.1.119
48	10.121.1.120/29	10.121.1.121 – 10.121.1.126	10.121.1.127
49	10.121.1.128/29	10.121.1.129 – 10.121.1.134	10.121.1.135
50	10.121.1.136/29	10.121.1.137 – 10.121.1.142	10.121.1.143
51	10.121.1.144/29	10.121.1.145 – 10.121.1.150	10.121.1.151
52	10.121.1.152/29	10.121.1.153 – 10.121.1.158	10.121.1.159
53	10.121.1.160/29	10.121.1.161 – 10.121.1.166	10.121.1.167
54	10.121.1.168/29	10.121.1.169 – 10.121.1.174	10.121.1.175
55	10.121.1.176/29	10.121.1.177 – 10.121.1.182	10.121.1.183
56	10.121.1.184/29	10.121.1.185 – 10.121.1.190	10.121.1.191
57	10.121.1.192/29	10.121.1.193 – 10.121.1.198	10.121.1.199
58	10.121.1.200/29	10.121.1.201 – 10.121.1.206	10.121.1.207
59	10.121.1.208/29	10.121.1.209 – 10.121.1.214	10.121.1.215
60	10.121.1.216/29	10.121.1.217 – 10.121.1.222	10.121.1.223
61	10.121.1.224/29	10.121.1.225 – 10.121.1.230	10.121.1.231
62	10.121.1.232/29	10.121.1.233 – 10.121.1.238	10.121.1.239
63	10.121.1.240/29	10.121.1.241 – 10.121.1.246	10.121.1.247
64	10.121.1.248/29	10.121.1.249 – 10.121.1.254	10.121.1.255
65	10.121.2.0/29	10.121.2.1 – 10.121.2.6	10.121.2.7
66	10.121.2.8/29	10.121.2.9 – 10.121.2.14	10.121.2.15
67	10.121.2.16/29	10.121.2.17 – 10.121.2.22	10.121.2.23
68	10.121.2.24/29	10.121.2.25 – 10.121.2.30	10.121.2.31
69	10.121.2.32/29	10.121.2.33 – 10.121.2.38	10.121.2.39
70	10.121.2.40/29	10.121.2.41 – 10.121.2.46	10.121.2.47
71	10.121.2.48/29	10.121.2.49 – 10.121.2.54	10.121.2.55
72	10.121.2.56/29	10.121.2.57 – 10.121.2.62	10.121.2.63
73	10.121.2.64/29	10.121.2.65 – 10.121.2.70	10.121.2.71
74	10.121.2.72/29	10.121.2.73 – 10.121.2.78	10.121.2.79
75	10.121.2.80/29	10.121.2.81 – 10.121.2.86	10.121.2.87
76	10.121.2.88/29	10.121.2.89 – 10.121.2.94	10.121.2.95
77	10.121.2.96/29	10.121.2.97 – 10.121.2.102	10.121.2.103
78	10.121.2.104/29	10.121.2.105 – 10.121.2.110	10.121.2.111
79	10.121.2.112/29	10.121.2.113 – 10.121.2.118	10.121.2.119
80	10.121.2.120/29	10.121.2.121 – 10.121.2.126	10.121.2.127
81	10.121.2.128/29	10.121.2.129 – 10.121.2.134	10.121.2.135
82	10.121.2.136/29	10.121.2.137 – 10.121.2.142	10.121.2.143
83	10.121.2.144/29	10.121.2.145 – 10.121.2.150	10.121.2.151
84	10.121.2.152/29	10.121.2.153 – 10.121.2.158	10.121.2.159
85	10.121.2.160/29	10.121.2.161 – 10.121.2.166	10.121.2.167
86	10.121.2.168/29	10.121.2.169 – 10.121.2.174	10.121.2.175
87	10.121.2.176/29	10.121.2.177 – 10.121.2.182	10.121.2.183
88	10.121.2.184/29	10.121.2.185 – 10.121.2.190	10.121.2.191
89	10.121.2.192/29	10.121.2.193 – 10.121.2.198	10.121.2.199
90	10.121.2.200/29	10.121.2.201 – 10.121.2.206	10.121.2.207
91	10.121.2.208/29	10.121.2.209 – 10.121.2.214	10.121.2.215
92	10.121.2.216/29	10.121.2.217 – 10.121.2.222	10.121.2.223
93	10.121.2.224/29	10.121.2.225 – 10.121.2.230	10.121.2.231
94	10.121.2.232/29	10.121.2.233 – 10.121.2.238	10.121.2.239
95	10.121.2.240/29	10.121.2.241 – 10.121.2.246	10.121.2.247
96	10.121.2.248/29	10.121.2.249 – 10.121.2.254	10.121.2.255
97	10.121.3.0/29	10.121.3.1 – 10.121.3.6	10.121.3.7
98	10.121.3.8/29	10.121.3.9 – 10.121.3.14	10.121.3.15
99	10.121.3.16/29	10.121.3.17 – 10.121.3.22	10.121.3.23
100	10.121.3.24/29	10.121.3.25 – 10.121.3.30	10.121.3.31
101	10.121.3.32/29	10.121.3.33 – 10.121.3.38	10.121.3.39
102	10.121.3.40/29	10.121.3.41 – 10.121.3.46	10.121.3.47
103	10.121.3.48/29	10.121.3.49 – 10.121.3.54	10.121.3.55
104	10.121.3.56/29	10.121.3.57 – 10.121.3.62	10.121.3.63
105	10.121.3.64/29	10.121.3.65 – 10.121.3.70	10.121.3.71
106	10.121.3.72/29	10.121.3.73 – 10.121.3.78	10.121.3.79
107	10.121.3.80/29	10.121.3.81 – 10.121.3.86	10.121.3.87
108	10.121.3.88/29	10.121.3.89 – 10.121.3.94	10.121.3.95
109	10.121.3.96/29	10.121.3.97 – 10.121.3.102	10.121.3.103
110	10.121.3.104/29	10.121.3.105 – 10.121.3.110	10.121.3.111
111	10.121.3.112/29	10.121.3.113 – 10.121.3.118	10.121.3.119
112	10.121.3.120/29	10.121.3.121 – 10.121.3.126	10.121.3.127
113	10.121.3.128/29	10.121.3.129 – 10.121.3.134	10.121.3.135
114	10.121.3.136/29	10.121.3.137 – 10.121.3.142	10.121.3.143
115	10.121.3.144/29	10.121.3.145 – 10.121.3.150	10.121.3.151
116	10.121.3.152/29	10.121.3.153 – 10.121.3.158	10.121.3.159
117	10.121.3.160/29	10.121.3.161 – 10.121.3.166	10.121.3.167
118	10.121.3.168/29	10.121.3.169 – 10.121.3.174	10.121.3.175
119	10.121.3.176/29	10.121.3.177 – 10.121.3.182	10.121.3.183
120	10.121.3.184/29	10.121.3.185 – 10.121.3.190	10.121.3.191
121	10.121.3.192/29	10.121.3.193 – 10.121.3.198	10.121.3.199
122	10.121.3.200/29	10.121.3.201 – 10.121.3.206	10.121.3.207
123	10.121.3.208/29	10.121.3.209 – 10.121.3.214	10.121.3.215
124	10.121.3.216/29	10.121.3.217 – 10.121.3.222	10.121.3.223
125	10.121.3.224/29	10.121.3.225 – 10.121.3.230	10.121.3.231
126	10.121.3.232/29	10.121.3.233 – 10.121.3.238	10.121.3.239
127	10.121.3.240/29	10.121.3.241 – 10.121.3.246	10.121.3.247
128	10.121.3.248/29	10.121.3.249 – 10.121.3.254	10.121.3.255
129	10.121.4.0/29	10.121.4.1 – 10.121.4.6	10.121.4.7
130	10.121.4.8/29	10.121.4.9 – 10.121.4.14	10.121.4.15
131	10.121.4.16/29	10.121.4.17 – 10.121.4.22	10.121.4.23
132	10.121.4.24/29	10.121.4.25 – 10.121.4.30	10.121.4.31
133	10.121.4.32/29	10.121.4.33 – 10.121.4.38	10.121.4.39
134	10.121.4.40/29	10.121.4.41 – 10.121.4.46	10.121.4.47
135	10.121.4.48/29	10.121.4.49 – 10.121.4.54	10.121.4.55
136	10.121.4.56/29	10.121.4.57 – 10.121.4.62	10.121.4.63
137	10.121.4.64/29	10.121.4.65 – 10.121.4.70	10.121.4.71
138	10.121.4.72/29	10.121.4.73 – 10.121.4.78	10.121.4.79
139	10.121.4.80/29	10.121.4.81 – 10.121.4.86	10.121.4.87
140	10.121.4.88/29	10.121.4.89 – 10.121.4.94	10.121.4.95
141	10.121.4.96/29	10.121.4.97 – 10.121.4.102	10.121.4.103
142	10.121.4.104/29	10.121.4.105 – 10.121.4.110	10.121.4.111
143	10.121.4.112/29	10.121.4.113 – 10.121.4.118	10.121.4.119
144	10.121.4.120/29	10.121.4.121 – 10.121.4.126	10.121.4.127
145	10.121.4.128/29	10.121.4.129 – 10.121.4.134	10.121.4.135
146	10.121.4.136/29	10.121.4.137 – 10.121.4.142	10.121.4.143
147	10.121.4.144/29	10.121.4.145 – 10.121.4.150	10.121.4.151
148	10.121.4.152/29	10.121.4.153 – 10.121.4.158	10.121.4.159
149	10.121.4.160/29	10.121.4.161 – 10.121.4.166	10.121.4.167
150	10.121.4.168/29	10.121.4.169 – 10.121.4.174	10.121.4.175
151	10.121.4.176/29	10.121.4.177 – 10.121.4.182	10.121.4.183
152	10.121.4.184/29	10.121.4.185 – 10.121.4.190	10.121.4.191
153	10.121.4.192/29	10.121.4.193 – 10.121.4.198	10.121.4.199
154	10.121.4.200/29	10.121.4.201 – 10.121.4.206	10.121.4.207
155	10.121.4.208/29	10.121.4.209 – 10.121.4.214	10.121.4.215
156	10.121.4.216/29	10.121.4.217 – 10.121.4.222	10.121.4.223
157	10.121.4.224/29	10.121.4.225 – 10.121.4.230	10.121.4.231
158	10.121.4.232/29	10.121.4.233 – 10.121.4.238	10.121.4.239
159	10.121.4.240/29	10.121.4.241 – 10.121.4.246	10.121.4.247
160	10.121.4.248/29	10.121.4.249 – 10.121.4.254	10.121.4.255
161	10.121.5.0/29	10.121.5.1 – 10.121.5.6	10.121.5.7
162	10.121.5.8/29	10.121.5.9 – 10.121.5.14	10.121.5.15
163	10.121.5.16/29	10.121.5.17 – 10.121.5.22	10.121.5.23
164	10.121.5.24/29	10.121.5.25 – 10.121.5.30	10.121.5.31
165	10.121.5.32/29	10.121.5.33 – 10.121.5.38	10.121.5.39
166	10.121.5.40/29	10.121.5.41 – 10.121.5.46	10.121.5.47
167	10.121.5.48/29	10.121.5.49 – 10.121.5.54	10.121.5.55
168	10.121.5.56/29	10.121.5.57 – 10.121.5.62	10.121.5.63
169	10.121.5.64/29	10.121.5.65 – 10.121.5.70	10.121.5.71
170	10.121.5.72/29	10.121.5.73 – 10.121.5.78	10.121.5.79
171	10.121.5.80/29	10.121.5.81 – 10.121.5.86	10.121.5.87
172	10.121.5.88/29	10.121.5.89 – 10.121.5.94	10.121.5.95
173	10.121.5.96/29	10.121.5.97 – 10.121.5.102	10.121.5.103
174	10.121.5.104/29	10.121.5.105 – 10.121.5.110	10.121.5.111
175	10.121.5.112/29	10.121.5.113 – 10.121.5.118	10.121.5.119
176	10.121.5.120/29	10.121.5.121 – 10.121.5.126	10.121.5.127
177	10.121.5.128/29	10.121.5.129 – 10.121.5.134	10.121.5.135
178	10.121.5.136/29	10.121.5.137 – 10.121.5.142	10.121.5.143
179	10.121.5.144/29	10.121.5.145 – 10.121.5.150	10.121.5.151
180	10.121.5.152/29	10.121.5.153 – 10.121.5.158	10.121.5.159
181	10.121.5.160/29	10.121.5.161 – 10.121.5.166	10.121.5.167
182	10.121.5.168/29	10.121.5.169 – 10.121.5.174	10.121.5.175
183	10.121.5.176/29	10.121.5.177 – 10.121.5.182	10.121.5.183
184	10.121.5.184/29	10.121.5.185 – 10.121.5.190	10.121.5.191
185	10.121.5.192/29	10.121.5.193 – 10.121.5.198	10.121.5.199
186	10.121.5.200/29	10.121.5.201 – 10.121.5.206	10.121.5.207
187	10.121.5.208/29	10.121.5.209 – 10.121.5.214	10.121.5.215
188	10.121.5.216/29	10.121.5.217 – 10.121.5.222	10.121.5.223
189	10.121.5.224/29	10.121.5.225 – 10.121.5.230	10.121.5.231
190	10.121.5.232/29	10.121.5.233 – 10.121.5.238	10.121.5.239
191	10.121.5.240/29	10.121.5.241 – 10.121.5.246	10.121.5.247
192	10.121.5.248/29	10.121.5.249 – 10.121.5.254	10.121.5.255
193	10.121.6.0/29	10.121.6.1 – 10.121.6.6	10.121.6.7
194	10.121.6.8/29	10.121.6.9 – 10.121.6.14	10.121.6.15
195	10.121.6.16/29	10.121.6.17 – 10.121.6.22	10.121.6.23
196	10.121.6.24/29	10.121.6.25 – 10.121.6.30	10.121.6.31
197	10.121.6.32/29	10.121.6.33 – 10.121.6.38	10.121.6.39
198	10.121.6.40/29	10.121.6.41 – 10.121.6.46	10.121.6.47
199	10.121.6.48/29	10.121.6.49 – 10.121.6.54	10.121.6.55
200	10.121.6.56/29	10.121.6.57 – 10.121.6.62	10.121.6.63
201	10.121.6.64/29	10.121.6.65 – 10.121.6.70	10.121.6.71
202	10.121.6.72/29	10.121.6.73 – 10.121.6.78	10.121.6.79
203	10.121.6.80/29	10.121.6.81 – 10.121.6.86	10.121.6.87
204	10.121.6.88/29	10.121.6.89 – 10.121.6.94	10.121.6.95
205	10.121.6.96/29	10.121.6.97 – 10.121.6.102	10.121.6.103
206	10.121.6.104/29	10.121.6.105 – 10.121.6.110	10.121.6.111
207	10.121.6.112/29	10.121.6.113 – 10.121.6.118	10.121.6.119
208	10.121.6.120/29	10.121.6.121 – 10.121.6.126	10.121.6.127
209	10.121.6.128/29	10.121.6.129 – 10.121.6.134	10.121.6.135
210	10.121.6.136/29	10.121.6.137 – 10.121.6.142	10.121.6.143
211	10.121.6.144/29	10.121.6.145 – 10.121.6.150	10.121.6.151
212	10.121.6.152/29	10.121.6.153 – 10.121.6.158	10.121.6.159
213	10.121.6.160/29	10.121.6.161 – 10.121.6.166	10.121.6.167
214	10.121.6.168/29	10.121.6.169 – 10.121.6.174	10.121.6.175
215	10.121.6.176/29	10.121.6.177 – 10.121.6.182	10.121.6.183
216	10.121.6.184/29	10.121.6.185 – 10.121.6.190	10.121.6.191
217	10.121.6.192/29	10.121.6.193 – 10.121.6.198	10.121.6.199
218	10.121.6.200/29	10.121.6.201 – 10.121.6.206	10.121.6.207
219	10.121.6.208/29	10.121.6.209 – 10.121.6.214	10.121.6.215
220	10.121.6.216/29	10.121.6.217 – 10.121.6.222	10.121.6.223
221	10.121.6.224/29	10.121.6.225 – 10.121.6.230	10.121.6.231
222	10.121.6.232/29	10.121.6.233 – 10.121.6.238	10.121.6.239
223	10.121.6.240/29	10.121.6.241 – 10.121.6.246	10.121.6.247
224	10.121.6.248/29	10.121.6.249 – 10.121.6.254	10.121.6.255
225	10.121.7.0/29	10.121.7.1 – 10.121.7.6	10.121.7.7
226	10.121.7.8/29	10.121.7.9 – 10.121.7.14	10.121.7.15
227	10.121.7.16/29	10.121.7.17 – 10.121.7.22	10.121.7.23
228	10.121.7.24/29	10.121.7.25 – 10.121.7.30	10.121.7.31
229	10.121.7.32/29	10.121.7.33 – 10.121.7.38	10.121.7.39
230	10.121.7.40/29	10.121.7.41 – 10.121.7.46	10.121.7.47
231	10.121.7.48/29	10.121.7.49 – 10.121.7.54	10.121.7.55
232	10.121.7.56/29	10.121.7.57 – 10.121.7.62	10.121.7.63
233	10.121.7.64/29	10.121.7.65 – 10.121.7.70	10.121.7.71
234	10.121.7.72/29	10.121.7.73 – 10.121.7.78	10.121.7.79
235	10.121.7.80/29	10.121.7.81 – 10.121.7.86	10.121.7.87
236	10.121.7.88/29	10.121.7.89 – 10.121.7.94	10.121.7.95
237	10.121.7.96/29	10.121.7.97 – 10.121.7.102	10.121.7.103
238	10.121.7.104/29	10.121.7.105 – 10.121.7.110	10.121.7.111
239	10.121.7.112/29	10.121.7.113 – 10.121.7.118	10.121.7.119
240	10.121.7.120/29	10.121.7.121 – 10.121.7.126	10.121.7.127
241	10.121.7.128/29	10.121.7.129 – 10.121.7.134	10.121.7.135
242	10.121.7.136/29	10.121.7.137 – 10.121.7.142	10.121.7.143
243	10.121.7.144/29	10.121.7.145 – 10.121.7.150	10.121.7.151
244	10.121.7.152/29	10.121.7.153 – 10.121.7.158	10.121.7.159
245	10.121.7.160/29	10.121.7.161 – 10.121.7.166	10.121.7.167
246	10.121.7.168/29	10.121.7.169 – 10.121.7.174	10.121.7.175
247	10.121.7.176/29	10.121.7.177 – 10.121.7.182	10.121.7.183
248	10.121.7.184/29	10.121.7.185 – 10.121.7.190	10.121.7.191
249	10.121.7.192/29	10.121.7.193 – 10.121.7.198	10.121.7.199
250	10.121.7.200/29	10.121.7.201 – 10.121.7.206	10.121.7.207
251	10.121.7.208/29	10.121.7.209 – 10.121.7.214	10.121.7.215
252	10.121.7.216/29	10.121.7.217 – 10.121.7.222	10.121.7.223
253	10.121.7.224/29	10.121.7.225 – 10.121.7.230	10.121.7.231
254	10.121.7.232/29	10.121.7.233 – 10.121.7.238	10.121.7.239
255	10.121.7.240/29	10.121.7.241 – 10.121.7.246	10.121.7.247
256	10.121.7.248/29	10.121.7.249 – 10.121.7.254	10.121.7.255

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 →