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)10.2.200.0/21

network10.2.200.0/21

broadcast10.2.207.255

first host10.2.200.1

last host10.2.207.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.200.0/21

address00001010.00000010.11001000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.11001000.00000000

broadcast00001010.00000010.11001111.11111111

green = network part, grey = host part

hex0x0a02c800

decimal167954432

reverse dns0.200.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.200.0/29	10.2.200.1 – 10.2.200.6	10.2.200.7
2	10.2.200.8/29	10.2.200.9 – 10.2.200.14	10.2.200.15
3	10.2.200.16/29	10.2.200.17 – 10.2.200.22	10.2.200.23
4	10.2.200.24/29	10.2.200.25 – 10.2.200.30	10.2.200.31
5	10.2.200.32/29	10.2.200.33 – 10.2.200.38	10.2.200.39
6	10.2.200.40/29	10.2.200.41 – 10.2.200.46	10.2.200.47
7	10.2.200.48/29	10.2.200.49 – 10.2.200.54	10.2.200.55
8	10.2.200.56/29	10.2.200.57 – 10.2.200.62	10.2.200.63
9	10.2.200.64/29	10.2.200.65 – 10.2.200.70	10.2.200.71
10	10.2.200.72/29	10.2.200.73 – 10.2.200.78	10.2.200.79
11	10.2.200.80/29	10.2.200.81 – 10.2.200.86	10.2.200.87
12	10.2.200.88/29	10.2.200.89 – 10.2.200.94	10.2.200.95
13	10.2.200.96/29	10.2.200.97 – 10.2.200.102	10.2.200.103
14	10.2.200.104/29	10.2.200.105 – 10.2.200.110	10.2.200.111
15	10.2.200.112/29	10.2.200.113 – 10.2.200.118	10.2.200.119
16	10.2.200.120/29	10.2.200.121 – 10.2.200.126	10.2.200.127
17	10.2.200.128/29	10.2.200.129 – 10.2.200.134	10.2.200.135
18	10.2.200.136/29	10.2.200.137 – 10.2.200.142	10.2.200.143
19	10.2.200.144/29	10.2.200.145 – 10.2.200.150	10.2.200.151
20	10.2.200.152/29	10.2.200.153 – 10.2.200.158	10.2.200.159
21	10.2.200.160/29	10.2.200.161 – 10.2.200.166	10.2.200.167
22	10.2.200.168/29	10.2.200.169 – 10.2.200.174	10.2.200.175
23	10.2.200.176/29	10.2.200.177 – 10.2.200.182	10.2.200.183
24	10.2.200.184/29	10.2.200.185 – 10.2.200.190	10.2.200.191
25	10.2.200.192/29	10.2.200.193 – 10.2.200.198	10.2.200.199
26	10.2.200.200/29	10.2.200.201 – 10.2.200.206	10.2.200.207
27	10.2.200.208/29	10.2.200.209 – 10.2.200.214	10.2.200.215
28	10.2.200.216/29	10.2.200.217 – 10.2.200.222	10.2.200.223
29	10.2.200.224/29	10.2.200.225 – 10.2.200.230	10.2.200.231
30	10.2.200.232/29	10.2.200.233 – 10.2.200.238	10.2.200.239
31	10.2.200.240/29	10.2.200.241 – 10.2.200.246	10.2.200.247
32	10.2.200.248/29	10.2.200.249 – 10.2.200.254	10.2.200.255
33	10.2.201.0/29	10.2.201.1 – 10.2.201.6	10.2.201.7
34	10.2.201.8/29	10.2.201.9 – 10.2.201.14	10.2.201.15
35	10.2.201.16/29	10.2.201.17 – 10.2.201.22	10.2.201.23
36	10.2.201.24/29	10.2.201.25 – 10.2.201.30	10.2.201.31
37	10.2.201.32/29	10.2.201.33 – 10.2.201.38	10.2.201.39
38	10.2.201.40/29	10.2.201.41 – 10.2.201.46	10.2.201.47
39	10.2.201.48/29	10.2.201.49 – 10.2.201.54	10.2.201.55
40	10.2.201.56/29	10.2.201.57 – 10.2.201.62	10.2.201.63
41	10.2.201.64/29	10.2.201.65 – 10.2.201.70	10.2.201.71
42	10.2.201.72/29	10.2.201.73 – 10.2.201.78	10.2.201.79
43	10.2.201.80/29	10.2.201.81 – 10.2.201.86	10.2.201.87
44	10.2.201.88/29	10.2.201.89 – 10.2.201.94	10.2.201.95
45	10.2.201.96/29	10.2.201.97 – 10.2.201.102	10.2.201.103
46	10.2.201.104/29	10.2.201.105 – 10.2.201.110	10.2.201.111
47	10.2.201.112/29	10.2.201.113 – 10.2.201.118	10.2.201.119
48	10.2.201.120/29	10.2.201.121 – 10.2.201.126	10.2.201.127
49	10.2.201.128/29	10.2.201.129 – 10.2.201.134	10.2.201.135
50	10.2.201.136/29	10.2.201.137 – 10.2.201.142	10.2.201.143
51	10.2.201.144/29	10.2.201.145 – 10.2.201.150	10.2.201.151
52	10.2.201.152/29	10.2.201.153 – 10.2.201.158	10.2.201.159
53	10.2.201.160/29	10.2.201.161 – 10.2.201.166	10.2.201.167
54	10.2.201.168/29	10.2.201.169 – 10.2.201.174	10.2.201.175
55	10.2.201.176/29	10.2.201.177 – 10.2.201.182	10.2.201.183
56	10.2.201.184/29	10.2.201.185 – 10.2.201.190	10.2.201.191
57	10.2.201.192/29	10.2.201.193 – 10.2.201.198	10.2.201.199
58	10.2.201.200/29	10.2.201.201 – 10.2.201.206	10.2.201.207
59	10.2.201.208/29	10.2.201.209 – 10.2.201.214	10.2.201.215
60	10.2.201.216/29	10.2.201.217 – 10.2.201.222	10.2.201.223
61	10.2.201.224/29	10.2.201.225 – 10.2.201.230	10.2.201.231
62	10.2.201.232/29	10.2.201.233 – 10.2.201.238	10.2.201.239
63	10.2.201.240/29	10.2.201.241 – 10.2.201.246	10.2.201.247
64	10.2.201.248/29	10.2.201.249 – 10.2.201.254	10.2.201.255
65	10.2.202.0/29	10.2.202.1 – 10.2.202.6	10.2.202.7
66	10.2.202.8/29	10.2.202.9 – 10.2.202.14	10.2.202.15
67	10.2.202.16/29	10.2.202.17 – 10.2.202.22	10.2.202.23
68	10.2.202.24/29	10.2.202.25 – 10.2.202.30	10.2.202.31
69	10.2.202.32/29	10.2.202.33 – 10.2.202.38	10.2.202.39
70	10.2.202.40/29	10.2.202.41 – 10.2.202.46	10.2.202.47
71	10.2.202.48/29	10.2.202.49 – 10.2.202.54	10.2.202.55
72	10.2.202.56/29	10.2.202.57 – 10.2.202.62	10.2.202.63
73	10.2.202.64/29	10.2.202.65 – 10.2.202.70	10.2.202.71
74	10.2.202.72/29	10.2.202.73 – 10.2.202.78	10.2.202.79
75	10.2.202.80/29	10.2.202.81 – 10.2.202.86	10.2.202.87
76	10.2.202.88/29	10.2.202.89 – 10.2.202.94	10.2.202.95
77	10.2.202.96/29	10.2.202.97 – 10.2.202.102	10.2.202.103
78	10.2.202.104/29	10.2.202.105 – 10.2.202.110	10.2.202.111
79	10.2.202.112/29	10.2.202.113 – 10.2.202.118	10.2.202.119
80	10.2.202.120/29	10.2.202.121 – 10.2.202.126	10.2.202.127
81	10.2.202.128/29	10.2.202.129 – 10.2.202.134	10.2.202.135
82	10.2.202.136/29	10.2.202.137 – 10.2.202.142	10.2.202.143
83	10.2.202.144/29	10.2.202.145 – 10.2.202.150	10.2.202.151
84	10.2.202.152/29	10.2.202.153 – 10.2.202.158	10.2.202.159
85	10.2.202.160/29	10.2.202.161 – 10.2.202.166	10.2.202.167
86	10.2.202.168/29	10.2.202.169 – 10.2.202.174	10.2.202.175
87	10.2.202.176/29	10.2.202.177 – 10.2.202.182	10.2.202.183
88	10.2.202.184/29	10.2.202.185 – 10.2.202.190	10.2.202.191
89	10.2.202.192/29	10.2.202.193 – 10.2.202.198	10.2.202.199
90	10.2.202.200/29	10.2.202.201 – 10.2.202.206	10.2.202.207
91	10.2.202.208/29	10.2.202.209 – 10.2.202.214	10.2.202.215
92	10.2.202.216/29	10.2.202.217 – 10.2.202.222	10.2.202.223
93	10.2.202.224/29	10.2.202.225 – 10.2.202.230	10.2.202.231
94	10.2.202.232/29	10.2.202.233 – 10.2.202.238	10.2.202.239
95	10.2.202.240/29	10.2.202.241 – 10.2.202.246	10.2.202.247
96	10.2.202.248/29	10.2.202.249 – 10.2.202.254	10.2.202.255
97	10.2.203.0/29	10.2.203.1 – 10.2.203.6	10.2.203.7
98	10.2.203.8/29	10.2.203.9 – 10.2.203.14	10.2.203.15
99	10.2.203.16/29	10.2.203.17 – 10.2.203.22	10.2.203.23
100	10.2.203.24/29	10.2.203.25 – 10.2.203.30	10.2.203.31
101	10.2.203.32/29	10.2.203.33 – 10.2.203.38	10.2.203.39
102	10.2.203.40/29	10.2.203.41 – 10.2.203.46	10.2.203.47
103	10.2.203.48/29	10.2.203.49 – 10.2.203.54	10.2.203.55
104	10.2.203.56/29	10.2.203.57 – 10.2.203.62	10.2.203.63
105	10.2.203.64/29	10.2.203.65 – 10.2.203.70	10.2.203.71
106	10.2.203.72/29	10.2.203.73 – 10.2.203.78	10.2.203.79
107	10.2.203.80/29	10.2.203.81 – 10.2.203.86	10.2.203.87
108	10.2.203.88/29	10.2.203.89 – 10.2.203.94	10.2.203.95
109	10.2.203.96/29	10.2.203.97 – 10.2.203.102	10.2.203.103
110	10.2.203.104/29	10.2.203.105 – 10.2.203.110	10.2.203.111
111	10.2.203.112/29	10.2.203.113 – 10.2.203.118	10.2.203.119
112	10.2.203.120/29	10.2.203.121 – 10.2.203.126	10.2.203.127
113	10.2.203.128/29	10.2.203.129 – 10.2.203.134	10.2.203.135
114	10.2.203.136/29	10.2.203.137 – 10.2.203.142	10.2.203.143
115	10.2.203.144/29	10.2.203.145 – 10.2.203.150	10.2.203.151
116	10.2.203.152/29	10.2.203.153 – 10.2.203.158	10.2.203.159
117	10.2.203.160/29	10.2.203.161 – 10.2.203.166	10.2.203.167
118	10.2.203.168/29	10.2.203.169 – 10.2.203.174	10.2.203.175
119	10.2.203.176/29	10.2.203.177 – 10.2.203.182	10.2.203.183
120	10.2.203.184/29	10.2.203.185 – 10.2.203.190	10.2.203.191
121	10.2.203.192/29	10.2.203.193 – 10.2.203.198	10.2.203.199
122	10.2.203.200/29	10.2.203.201 – 10.2.203.206	10.2.203.207
123	10.2.203.208/29	10.2.203.209 – 10.2.203.214	10.2.203.215
124	10.2.203.216/29	10.2.203.217 – 10.2.203.222	10.2.203.223
125	10.2.203.224/29	10.2.203.225 – 10.2.203.230	10.2.203.231
126	10.2.203.232/29	10.2.203.233 – 10.2.203.238	10.2.203.239
127	10.2.203.240/29	10.2.203.241 – 10.2.203.246	10.2.203.247
128	10.2.203.248/29	10.2.203.249 – 10.2.203.254	10.2.203.255
129	10.2.204.0/29	10.2.204.1 – 10.2.204.6	10.2.204.7
130	10.2.204.8/29	10.2.204.9 – 10.2.204.14	10.2.204.15
131	10.2.204.16/29	10.2.204.17 – 10.2.204.22	10.2.204.23
132	10.2.204.24/29	10.2.204.25 – 10.2.204.30	10.2.204.31
133	10.2.204.32/29	10.2.204.33 – 10.2.204.38	10.2.204.39
134	10.2.204.40/29	10.2.204.41 – 10.2.204.46	10.2.204.47
135	10.2.204.48/29	10.2.204.49 – 10.2.204.54	10.2.204.55
136	10.2.204.56/29	10.2.204.57 – 10.2.204.62	10.2.204.63
137	10.2.204.64/29	10.2.204.65 – 10.2.204.70	10.2.204.71
138	10.2.204.72/29	10.2.204.73 – 10.2.204.78	10.2.204.79
139	10.2.204.80/29	10.2.204.81 – 10.2.204.86	10.2.204.87
140	10.2.204.88/29	10.2.204.89 – 10.2.204.94	10.2.204.95
141	10.2.204.96/29	10.2.204.97 – 10.2.204.102	10.2.204.103
142	10.2.204.104/29	10.2.204.105 – 10.2.204.110	10.2.204.111
143	10.2.204.112/29	10.2.204.113 – 10.2.204.118	10.2.204.119
144	10.2.204.120/29	10.2.204.121 – 10.2.204.126	10.2.204.127
145	10.2.204.128/29	10.2.204.129 – 10.2.204.134	10.2.204.135
146	10.2.204.136/29	10.2.204.137 – 10.2.204.142	10.2.204.143
147	10.2.204.144/29	10.2.204.145 – 10.2.204.150	10.2.204.151
148	10.2.204.152/29	10.2.204.153 – 10.2.204.158	10.2.204.159
149	10.2.204.160/29	10.2.204.161 – 10.2.204.166	10.2.204.167
150	10.2.204.168/29	10.2.204.169 – 10.2.204.174	10.2.204.175
151	10.2.204.176/29	10.2.204.177 – 10.2.204.182	10.2.204.183
152	10.2.204.184/29	10.2.204.185 – 10.2.204.190	10.2.204.191
153	10.2.204.192/29	10.2.204.193 – 10.2.204.198	10.2.204.199
154	10.2.204.200/29	10.2.204.201 – 10.2.204.206	10.2.204.207
155	10.2.204.208/29	10.2.204.209 – 10.2.204.214	10.2.204.215
156	10.2.204.216/29	10.2.204.217 – 10.2.204.222	10.2.204.223
157	10.2.204.224/29	10.2.204.225 – 10.2.204.230	10.2.204.231
158	10.2.204.232/29	10.2.204.233 – 10.2.204.238	10.2.204.239
159	10.2.204.240/29	10.2.204.241 – 10.2.204.246	10.2.204.247
160	10.2.204.248/29	10.2.204.249 – 10.2.204.254	10.2.204.255
161	10.2.205.0/29	10.2.205.1 – 10.2.205.6	10.2.205.7
162	10.2.205.8/29	10.2.205.9 – 10.2.205.14	10.2.205.15
163	10.2.205.16/29	10.2.205.17 – 10.2.205.22	10.2.205.23
164	10.2.205.24/29	10.2.205.25 – 10.2.205.30	10.2.205.31
165	10.2.205.32/29	10.2.205.33 – 10.2.205.38	10.2.205.39
166	10.2.205.40/29	10.2.205.41 – 10.2.205.46	10.2.205.47
167	10.2.205.48/29	10.2.205.49 – 10.2.205.54	10.2.205.55
168	10.2.205.56/29	10.2.205.57 – 10.2.205.62	10.2.205.63
169	10.2.205.64/29	10.2.205.65 – 10.2.205.70	10.2.205.71
170	10.2.205.72/29	10.2.205.73 – 10.2.205.78	10.2.205.79
171	10.2.205.80/29	10.2.205.81 – 10.2.205.86	10.2.205.87
172	10.2.205.88/29	10.2.205.89 – 10.2.205.94	10.2.205.95
173	10.2.205.96/29	10.2.205.97 – 10.2.205.102	10.2.205.103
174	10.2.205.104/29	10.2.205.105 – 10.2.205.110	10.2.205.111
175	10.2.205.112/29	10.2.205.113 – 10.2.205.118	10.2.205.119
176	10.2.205.120/29	10.2.205.121 – 10.2.205.126	10.2.205.127
177	10.2.205.128/29	10.2.205.129 – 10.2.205.134	10.2.205.135
178	10.2.205.136/29	10.2.205.137 – 10.2.205.142	10.2.205.143
179	10.2.205.144/29	10.2.205.145 – 10.2.205.150	10.2.205.151
180	10.2.205.152/29	10.2.205.153 – 10.2.205.158	10.2.205.159
181	10.2.205.160/29	10.2.205.161 – 10.2.205.166	10.2.205.167
182	10.2.205.168/29	10.2.205.169 – 10.2.205.174	10.2.205.175
183	10.2.205.176/29	10.2.205.177 – 10.2.205.182	10.2.205.183
184	10.2.205.184/29	10.2.205.185 – 10.2.205.190	10.2.205.191
185	10.2.205.192/29	10.2.205.193 – 10.2.205.198	10.2.205.199
186	10.2.205.200/29	10.2.205.201 – 10.2.205.206	10.2.205.207
187	10.2.205.208/29	10.2.205.209 – 10.2.205.214	10.2.205.215
188	10.2.205.216/29	10.2.205.217 – 10.2.205.222	10.2.205.223
189	10.2.205.224/29	10.2.205.225 – 10.2.205.230	10.2.205.231
190	10.2.205.232/29	10.2.205.233 – 10.2.205.238	10.2.205.239
191	10.2.205.240/29	10.2.205.241 – 10.2.205.246	10.2.205.247
192	10.2.205.248/29	10.2.205.249 – 10.2.205.254	10.2.205.255
193	10.2.206.0/29	10.2.206.1 – 10.2.206.6	10.2.206.7
194	10.2.206.8/29	10.2.206.9 – 10.2.206.14	10.2.206.15
195	10.2.206.16/29	10.2.206.17 – 10.2.206.22	10.2.206.23
196	10.2.206.24/29	10.2.206.25 – 10.2.206.30	10.2.206.31
197	10.2.206.32/29	10.2.206.33 – 10.2.206.38	10.2.206.39
198	10.2.206.40/29	10.2.206.41 – 10.2.206.46	10.2.206.47
199	10.2.206.48/29	10.2.206.49 – 10.2.206.54	10.2.206.55
200	10.2.206.56/29	10.2.206.57 – 10.2.206.62	10.2.206.63
201	10.2.206.64/29	10.2.206.65 – 10.2.206.70	10.2.206.71
202	10.2.206.72/29	10.2.206.73 – 10.2.206.78	10.2.206.79
203	10.2.206.80/29	10.2.206.81 – 10.2.206.86	10.2.206.87
204	10.2.206.88/29	10.2.206.89 – 10.2.206.94	10.2.206.95
205	10.2.206.96/29	10.2.206.97 – 10.2.206.102	10.2.206.103
206	10.2.206.104/29	10.2.206.105 – 10.2.206.110	10.2.206.111
207	10.2.206.112/29	10.2.206.113 – 10.2.206.118	10.2.206.119
208	10.2.206.120/29	10.2.206.121 – 10.2.206.126	10.2.206.127
209	10.2.206.128/29	10.2.206.129 – 10.2.206.134	10.2.206.135
210	10.2.206.136/29	10.2.206.137 – 10.2.206.142	10.2.206.143
211	10.2.206.144/29	10.2.206.145 – 10.2.206.150	10.2.206.151
212	10.2.206.152/29	10.2.206.153 – 10.2.206.158	10.2.206.159
213	10.2.206.160/29	10.2.206.161 – 10.2.206.166	10.2.206.167
214	10.2.206.168/29	10.2.206.169 – 10.2.206.174	10.2.206.175
215	10.2.206.176/29	10.2.206.177 – 10.2.206.182	10.2.206.183
216	10.2.206.184/29	10.2.206.185 – 10.2.206.190	10.2.206.191
217	10.2.206.192/29	10.2.206.193 – 10.2.206.198	10.2.206.199
218	10.2.206.200/29	10.2.206.201 – 10.2.206.206	10.2.206.207
219	10.2.206.208/29	10.2.206.209 – 10.2.206.214	10.2.206.215
220	10.2.206.216/29	10.2.206.217 – 10.2.206.222	10.2.206.223
221	10.2.206.224/29	10.2.206.225 – 10.2.206.230	10.2.206.231
222	10.2.206.232/29	10.2.206.233 – 10.2.206.238	10.2.206.239
223	10.2.206.240/29	10.2.206.241 – 10.2.206.246	10.2.206.247
224	10.2.206.248/29	10.2.206.249 – 10.2.206.254	10.2.206.255
225	10.2.207.0/29	10.2.207.1 – 10.2.207.6	10.2.207.7
226	10.2.207.8/29	10.2.207.9 – 10.2.207.14	10.2.207.15
227	10.2.207.16/29	10.2.207.17 – 10.2.207.22	10.2.207.23
228	10.2.207.24/29	10.2.207.25 – 10.2.207.30	10.2.207.31
229	10.2.207.32/29	10.2.207.33 – 10.2.207.38	10.2.207.39
230	10.2.207.40/29	10.2.207.41 – 10.2.207.46	10.2.207.47
231	10.2.207.48/29	10.2.207.49 – 10.2.207.54	10.2.207.55
232	10.2.207.56/29	10.2.207.57 – 10.2.207.62	10.2.207.63
233	10.2.207.64/29	10.2.207.65 – 10.2.207.70	10.2.207.71
234	10.2.207.72/29	10.2.207.73 – 10.2.207.78	10.2.207.79
235	10.2.207.80/29	10.2.207.81 – 10.2.207.86	10.2.207.87
236	10.2.207.88/29	10.2.207.89 – 10.2.207.94	10.2.207.95
237	10.2.207.96/29	10.2.207.97 – 10.2.207.102	10.2.207.103
238	10.2.207.104/29	10.2.207.105 – 10.2.207.110	10.2.207.111
239	10.2.207.112/29	10.2.207.113 – 10.2.207.118	10.2.207.119
240	10.2.207.120/29	10.2.207.121 – 10.2.207.126	10.2.207.127
241	10.2.207.128/29	10.2.207.129 – 10.2.207.134	10.2.207.135
242	10.2.207.136/29	10.2.207.137 – 10.2.207.142	10.2.207.143
243	10.2.207.144/29	10.2.207.145 – 10.2.207.150	10.2.207.151
244	10.2.207.152/29	10.2.207.153 – 10.2.207.158	10.2.207.159
245	10.2.207.160/29	10.2.207.161 – 10.2.207.166	10.2.207.167
246	10.2.207.168/29	10.2.207.169 – 10.2.207.174	10.2.207.175
247	10.2.207.176/29	10.2.207.177 – 10.2.207.182	10.2.207.183
248	10.2.207.184/29	10.2.207.185 – 10.2.207.190	10.2.207.191
249	10.2.207.192/29	10.2.207.193 – 10.2.207.198	10.2.207.199
250	10.2.207.200/29	10.2.207.201 – 10.2.207.206	10.2.207.207
251	10.2.207.208/29	10.2.207.209 – 10.2.207.214	10.2.207.215
252	10.2.207.216/29	10.2.207.217 – 10.2.207.222	10.2.207.223
253	10.2.207.224/29	10.2.207.225 – 10.2.207.230	10.2.207.231
254	10.2.207.232/29	10.2.207.233 – 10.2.207.238	10.2.207.239
255	10.2.207.240/29	10.2.207.241 – 10.2.207.246	10.2.207.247
256	10.2.207.248/29	10.2.207.249 – 10.2.207.254	10.2.207.255

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