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)10.2.48.0/21

network10.2.48.0/21

broadcast10.2.55.255

first host10.2.48.1

last host10.2.55.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.48.0/21

address00001010.00000010.00110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.00110000.00000000

broadcast00001010.00000010.00110111.11111111

green = network part, grey = host part

hex0x0a023000

decimal167915520

reverse dns0.48.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.48.0/29	10.2.48.1 – 10.2.48.6	10.2.48.7
2	10.2.48.8/29	10.2.48.9 – 10.2.48.14	10.2.48.15
3	10.2.48.16/29	10.2.48.17 – 10.2.48.22	10.2.48.23
4	10.2.48.24/29	10.2.48.25 – 10.2.48.30	10.2.48.31
5	10.2.48.32/29	10.2.48.33 – 10.2.48.38	10.2.48.39
6	10.2.48.40/29	10.2.48.41 – 10.2.48.46	10.2.48.47
7	10.2.48.48/29	10.2.48.49 – 10.2.48.54	10.2.48.55
8	10.2.48.56/29	10.2.48.57 – 10.2.48.62	10.2.48.63
9	10.2.48.64/29	10.2.48.65 – 10.2.48.70	10.2.48.71
10	10.2.48.72/29	10.2.48.73 – 10.2.48.78	10.2.48.79
11	10.2.48.80/29	10.2.48.81 – 10.2.48.86	10.2.48.87
12	10.2.48.88/29	10.2.48.89 – 10.2.48.94	10.2.48.95
13	10.2.48.96/29	10.2.48.97 – 10.2.48.102	10.2.48.103
14	10.2.48.104/29	10.2.48.105 – 10.2.48.110	10.2.48.111
15	10.2.48.112/29	10.2.48.113 – 10.2.48.118	10.2.48.119
16	10.2.48.120/29	10.2.48.121 – 10.2.48.126	10.2.48.127
17	10.2.48.128/29	10.2.48.129 – 10.2.48.134	10.2.48.135
18	10.2.48.136/29	10.2.48.137 – 10.2.48.142	10.2.48.143
19	10.2.48.144/29	10.2.48.145 – 10.2.48.150	10.2.48.151
20	10.2.48.152/29	10.2.48.153 – 10.2.48.158	10.2.48.159
21	10.2.48.160/29	10.2.48.161 – 10.2.48.166	10.2.48.167
22	10.2.48.168/29	10.2.48.169 – 10.2.48.174	10.2.48.175
23	10.2.48.176/29	10.2.48.177 – 10.2.48.182	10.2.48.183
24	10.2.48.184/29	10.2.48.185 – 10.2.48.190	10.2.48.191
25	10.2.48.192/29	10.2.48.193 – 10.2.48.198	10.2.48.199
26	10.2.48.200/29	10.2.48.201 – 10.2.48.206	10.2.48.207
27	10.2.48.208/29	10.2.48.209 – 10.2.48.214	10.2.48.215
28	10.2.48.216/29	10.2.48.217 – 10.2.48.222	10.2.48.223
29	10.2.48.224/29	10.2.48.225 – 10.2.48.230	10.2.48.231
30	10.2.48.232/29	10.2.48.233 – 10.2.48.238	10.2.48.239
31	10.2.48.240/29	10.2.48.241 – 10.2.48.246	10.2.48.247
32	10.2.48.248/29	10.2.48.249 – 10.2.48.254	10.2.48.255
33	10.2.49.0/29	10.2.49.1 – 10.2.49.6	10.2.49.7
34	10.2.49.8/29	10.2.49.9 – 10.2.49.14	10.2.49.15
35	10.2.49.16/29	10.2.49.17 – 10.2.49.22	10.2.49.23
36	10.2.49.24/29	10.2.49.25 – 10.2.49.30	10.2.49.31
37	10.2.49.32/29	10.2.49.33 – 10.2.49.38	10.2.49.39
38	10.2.49.40/29	10.2.49.41 – 10.2.49.46	10.2.49.47
39	10.2.49.48/29	10.2.49.49 – 10.2.49.54	10.2.49.55
40	10.2.49.56/29	10.2.49.57 – 10.2.49.62	10.2.49.63
41	10.2.49.64/29	10.2.49.65 – 10.2.49.70	10.2.49.71
42	10.2.49.72/29	10.2.49.73 – 10.2.49.78	10.2.49.79
43	10.2.49.80/29	10.2.49.81 – 10.2.49.86	10.2.49.87
44	10.2.49.88/29	10.2.49.89 – 10.2.49.94	10.2.49.95
45	10.2.49.96/29	10.2.49.97 – 10.2.49.102	10.2.49.103
46	10.2.49.104/29	10.2.49.105 – 10.2.49.110	10.2.49.111
47	10.2.49.112/29	10.2.49.113 – 10.2.49.118	10.2.49.119
48	10.2.49.120/29	10.2.49.121 – 10.2.49.126	10.2.49.127
49	10.2.49.128/29	10.2.49.129 – 10.2.49.134	10.2.49.135
50	10.2.49.136/29	10.2.49.137 – 10.2.49.142	10.2.49.143
51	10.2.49.144/29	10.2.49.145 – 10.2.49.150	10.2.49.151
52	10.2.49.152/29	10.2.49.153 – 10.2.49.158	10.2.49.159
53	10.2.49.160/29	10.2.49.161 – 10.2.49.166	10.2.49.167
54	10.2.49.168/29	10.2.49.169 – 10.2.49.174	10.2.49.175
55	10.2.49.176/29	10.2.49.177 – 10.2.49.182	10.2.49.183
56	10.2.49.184/29	10.2.49.185 – 10.2.49.190	10.2.49.191
57	10.2.49.192/29	10.2.49.193 – 10.2.49.198	10.2.49.199
58	10.2.49.200/29	10.2.49.201 – 10.2.49.206	10.2.49.207
59	10.2.49.208/29	10.2.49.209 – 10.2.49.214	10.2.49.215
60	10.2.49.216/29	10.2.49.217 – 10.2.49.222	10.2.49.223
61	10.2.49.224/29	10.2.49.225 – 10.2.49.230	10.2.49.231
62	10.2.49.232/29	10.2.49.233 – 10.2.49.238	10.2.49.239
63	10.2.49.240/29	10.2.49.241 – 10.2.49.246	10.2.49.247
64	10.2.49.248/29	10.2.49.249 – 10.2.49.254	10.2.49.255
65	10.2.50.0/29	10.2.50.1 – 10.2.50.6	10.2.50.7
66	10.2.50.8/29	10.2.50.9 – 10.2.50.14	10.2.50.15
67	10.2.50.16/29	10.2.50.17 – 10.2.50.22	10.2.50.23
68	10.2.50.24/29	10.2.50.25 – 10.2.50.30	10.2.50.31
69	10.2.50.32/29	10.2.50.33 – 10.2.50.38	10.2.50.39
70	10.2.50.40/29	10.2.50.41 – 10.2.50.46	10.2.50.47
71	10.2.50.48/29	10.2.50.49 – 10.2.50.54	10.2.50.55
72	10.2.50.56/29	10.2.50.57 – 10.2.50.62	10.2.50.63
73	10.2.50.64/29	10.2.50.65 – 10.2.50.70	10.2.50.71
74	10.2.50.72/29	10.2.50.73 – 10.2.50.78	10.2.50.79
75	10.2.50.80/29	10.2.50.81 – 10.2.50.86	10.2.50.87
76	10.2.50.88/29	10.2.50.89 – 10.2.50.94	10.2.50.95
77	10.2.50.96/29	10.2.50.97 – 10.2.50.102	10.2.50.103
78	10.2.50.104/29	10.2.50.105 – 10.2.50.110	10.2.50.111
79	10.2.50.112/29	10.2.50.113 – 10.2.50.118	10.2.50.119
80	10.2.50.120/29	10.2.50.121 – 10.2.50.126	10.2.50.127
81	10.2.50.128/29	10.2.50.129 – 10.2.50.134	10.2.50.135
82	10.2.50.136/29	10.2.50.137 – 10.2.50.142	10.2.50.143
83	10.2.50.144/29	10.2.50.145 – 10.2.50.150	10.2.50.151
84	10.2.50.152/29	10.2.50.153 – 10.2.50.158	10.2.50.159
85	10.2.50.160/29	10.2.50.161 – 10.2.50.166	10.2.50.167
86	10.2.50.168/29	10.2.50.169 – 10.2.50.174	10.2.50.175
87	10.2.50.176/29	10.2.50.177 – 10.2.50.182	10.2.50.183
88	10.2.50.184/29	10.2.50.185 – 10.2.50.190	10.2.50.191
89	10.2.50.192/29	10.2.50.193 – 10.2.50.198	10.2.50.199
90	10.2.50.200/29	10.2.50.201 – 10.2.50.206	10.2.50.207
91	10.2.50.208/29	10.2.50.209 – 10.2.50.214	10.2.50.215
92	10.2.50.216/29	10.2.50.217 – 10.2.50.222	10.2.50.223
93	10.2.50.224/29	10.2.50.225 – 10.2.50.230	10.2.50.231
94	10.2.50.232/29	10.2.50.233 – 10.2.50.238	10.2.50.239
95	10.2.50.240/29	10.2.50.241 – 10.2.50.246	10.2.50.247
96	10.2.50.248/29	10.2.50.249 – 10.2.50.254	10.2.50.255
97	10.2.51.0/29	10.2.51.1 – 10.2.51.6	10.2.51.7
98	10.2.51.8/29	10.2.51.9 – 10.2.51.14	10.2.51.15
99	10.2.51.16/29	10.2.51.17 – 10.2.51.22	10.2.51.23
100	10.2.51.24/29	10.2.51.25 – 10.2.51.30	10.2.51.31
101	10.2.51.32/29	10.2.51.33 – 10.2.51.38	10.2.51.39
102	10.2.51.40/29	10.2.51.41 – 10.2.51.46	10.2.51.47
103	10.2.51.48/29	10.2.51.49 – 10.2.51.54	10.2.51.55
104	10.2.51.56/29	10.2.51.57 – 10.2.51.62	10.2.51.63
105	10.2.51.64/29	10.2.51.65 – 10.2.51.70	10.2.51.71
106	10.2.51.72/29	10.2.51.73 – 10.2.51.78	10.2.51.79
107	10.2.51.80/29	10.2.51.81 – 10.2.51.86	10.2.51.87
108	10.2.51.88/29	10.2.51.89 – 10.2.51.94	10.2.51.95
109	10.2.51.96/29	10.2.51.97 – 10.2.51.102	10.2.51.103
110	10.2.51.104/29	10.2.51.105 – 10.2.51.110	10.2.51.111
111	10.2.51.112/29	10.2.51.113 – 10.2.51.118	10.2.51.119
112	10.2.51.120/29	10.2.51.121 – 10.2.51.126	10.2.51.127
113	10.2.51.128/29	10.2.51.129 – 10.2.51.134	10.2.51.135
114	10.2.51.136/29	10.2.51.137 – 10.2.51.142	10.2.51.143
115	10.2.51.144/29	10.2.51.145 – 10.2.51.150	10.2.51.151
116	10.2.51.152/29	10.2.51.153 – 10.2.51.158	10.2.51.159
117	10.2.51.160/29	10.2.51.161 – 10.2.51.166	10.2.51.167
118	10.2.51.168/29	10.2.51.169 – 10.2.51.174	10.2.51.175
119	10.2.51.176/29	10.2.51.177 – 10.2.51.182	10.2.51.183
120	10.2.51.184/29	10.2.51.185 – 10.2.51.190	10.2.51.191
121	10.2.51.192/29	10.2.51.193 – 10.2.51.198	10.2.51.199
122	10.2.51.200/29	10.2.51.201 – 10.2.51.206	10.2.51.207
123	10.2.51.208/29	10.2.51.209 – 10.2.51.214	10.2.51.215
124	10.2.51.216/29	10.2.51.217 – 10.2.51.222	10.2.51.223
125	10.2.51.224/29	10.2.51.225 – 10.2.51.230	10.2.51.231
126	10.2.51.232/29	10.2.51.233 – 10.2.51.238	10.2.51.239
127	10.2.51.240/29	10.2.51.241 – 10.2.51.246	10.2.51.247
128	10.2.51.248/29	10.2.51.249 – 10.2.51.254	10.2.51.255
129	10.2.52.0/29	10.2.52.1 – 10.2.52.6	10.2.52.7
130	10.2.52.8/29	10.2.52.9 – 10.2.52.14	10.2.52.15
131	10.2.52.16/29	10.2.52.17 – 10.2.52.22	10.2.52.23
132	10.2.52.24/29	10.2.52.25 – 10.2.52.30	10.2.52.31
133	10.2.52.32/29	10.2.52.33 – 10.2.52.38	10.2.52.39
134	10.2.52.40/29	10.2.52.41 – 10.2.52.46	10.2.52.47
135	10.2.52.48/29	10.2.52.49 – 10.2.52.54	10.2.52.55
136	10.2.52.56/29	10.2.52.57 – 10.2.52.62	10.2.52.63
137	10.2.52.64/29	10.2.52.65 – 10.2.52.70	10.2.52.71
138	10.2.52.72/29	10.2.52.73 – 10.2.52.78	10.2.52.79
139	10.2.52.80/29	10.2.52.81 – 10.2.52.86	10.2.52.87
140	10.2.52.88/29	10.2.52.89 – 10.2.52.94	10.2.52.95
141	10.2.52.96/29	10.2.52.97 – 10.2.52.102	10.2.52.103
142	10.2.52.104/29	10.2.52.105 – 10.2.52.110	10.2.52.111
143	10.2.52.112/29	10.2.52.113 – 10.2.52.118	10.2.52.119
144	10.2.52.120/29	10.2.52.121 – 10.2.52.126	10.2.52.127
145	10.2.52.128/29	10.2.52.129 – 10.2.52.134	10.2.52.135
146	10.2.52.136/29	10.2.52.137 – 10.2.52.142	10.2.52.143
147	10.2.52.144/29	10.2.52.145 – 10.2.52.150	10.2.52.151
148	10.2.52.152/29	10.2.52.153 – 10.2.52.158	10.2.52.159
149	10.2.52.160/29	10.2.52.161 – 10.2.52.166	10.2.52.167
150	10.2.52.168/29	10.2.52.169 – 10.2.52.174	10.2.52.175
151	10.2.52.176/29	10.2.52.177 – 10.2.52.182	10.2.52.183
152	10.2.52.184/29	10.2.52.185 – 10.2.52.190	10.2.52.191
153	10.2.52.192/29	10.2.52.193 – 10.2.52.198	10.2.52.199
154	10.2.52.200/29	10.2.52.201 – 10.2.52.206	10.2.52.207
155	10.2.52.208/29	10.2.52.209 – 10.2.52.214	10.2.52.215
156	10.2.52.216/29	10.2.52.217 – 10.2.52.222	10.2.52.223
157	10.2.52.224/29	10.2.52.225 – 10.2.52.230	10.2.52.231
158	10.2.52.232/29	10.2.52.233 – 10.2.52.238	10.2.52.239
159	10.2.52.240/29	10.2.52.241 – 10.2.52.246	10.2.52.247
160	10.2.52.248/29	10.2.52.249 – 10.2.52.254	10.2.52.255
161	10.2.53.0/29	10.2.53.1 – 10.2.53.6	10.2.53.7
162	10.2.53.8/29	10.2.53.9 – 10.2.53.14	10.2.53.15
163	10.2.53.16/29	10.2.53.17 – 10.2.53.22	10.2.53.23
164	10.2.53.24/29	10.2.53.25 – 10.2.53.30	10.2.53.31
165	10.2.53.32/29	10.2.53.33 – 10.2.53.38	10.2.53.39
166	10.2.53.40/29	10.2.53.41 – 10.2.53.46	10.2.53.47
167	10.2.53.48/29	10.2.53.49 – 10.2.53.54	10.2.53.55
168	10.2.53.56/29	10.2.53.57 – 10.2.53.62	10.2.53.63
169	10.2.53.64/29	10.2.53.65 – 10.2.53.70	10.2.53.71
170	10.2.53.72/29	10.2.53.73 – 10.2.53.78	10.2.53.79
171	10.2.53.80/29	10.2.53.81 – 10.2.53.86	10.2.53.87
172	10.2.53.88/29	10.2.53.89 – 10.2.53.94	10.2.53.95
173	10.2.53.96/29	10.2.53.97 – 10.2.53.102	10.2.53.103
174	10.2.53.104/29	10.2.53.105 – 10.2.53.110	10.2.53.111
175	10.2.53.112/29	10.2.53.113 – 10.2.53.118	10.2.53.119
176	10.2.53.120/29	10.2.53.121 – 10.2.53.126	10.2.53.127
177	10.2.53.128/29	10.2.53.129 – 10.2.53.134	10.2.53.135
178	10.2.53.136/29	10.2.53.137 – 10.2.53.142	10.2.53.143
179	10.2.53.144/29	10.2.53.145 – 10.2.53.150	10.2.53.151
180	10.2.53.152/29	10.2.53.153 – 10.2.53.158	10.2.53.159
181	10.2.53.160/29	10.2.53.161 – 10.2.53.166	10.2.53.167
182	10.2.53.168/29	10.2.53.169 – 10.2.53.174	10.2.53.175
183	10.2.53.176/29	10.2.53.177 – 10.2.53.182	10.2.53.183
184	10.2.53.184/29	10.2.53.185 – 10.2.53.190	10.2.53.191
185	10.2.53.192/29	10.2.53.193 – 10.2.53.198	10.2.53.199
186	10.2.53.200/29	10.2.53.201 – 10.2.53.206	10.2.53.207
187	10.2.53.208/29	10.2.53.209 – 10.2.53.214	10.2.53.215
188	10.2.53.216/29	10.2.53.217 – 10.2.53.222	10.2.53.223
189	10.2.53.224/29	10.2.53.225 – 10.2.53.230	10.2.53.231
190	10.2.53.232/29	10.2.53.233 – 10.2.53.238	10.2.53.239
191	10.2.53.240/29	10.2.53.241 – 10.2.53.246	10.2.53.247
192	10.2.53.248/29	10.2.53.249 – 10.2.53.254	10.2.53.255
193	10.2.54.0/29	10.2.54.1 – 10.2.54.6	10.2.54.7
194	10.2.54.8/29	10.2.54.9 – 10.2.54.14	10.2.54.15
195	10.2.54.16/29	10.2.54.17 – 10.2.54.22	10.2.54.23
196	10.2.54.24/29	10.2.54.25 – 10.2.54.30	10.2.54.31
197	10.2.54.32/29	10.2.54.33 – 10.2.54.38	10.2.54.39
198	10.2.54.40/29	10.2.54.41 – 10.2.54.46	10.2.54.47
199	10.2.54.48/29	10.2.54.49 – 10.2.54.54	10.2.54.55
200	10.2.54.56/29	10.2.54.57 – 10.2.54.62	10.2.54.63
201	10.2.54.64/29	10.2.54.65 – 10.2.54.70	10.2.54.71
202	10.2.54.72/29	10.2.54.73 – 10.2.54.78	10.2.54.79
203	10.2.54.80/29	10.2.54.81 – 10.2.54.86	10.2.54.87
204	10.2.54.88/29	10.2.54.89 – 10.2.54.94	10.2.54.95
205	10.2.54.96/29	10.2.54.97 – 10.2.54.102	10.2.54.103
206	10.2.54.104/29	10.2.54.105 – 10.2.54.110	10.2.54.111
207	10.2.54.112/29	10.2.54.113 – 10.2.54.118	10.2.54.119
208	10.2.54.120/29	10.2.54.121 – 10.2.54.126	10.2.54.127
209	10.2.54.128/29	10.2.54.129 – 10.2.54.134	10.2.54.135
210	10.2.54.136/29	10.2.54.137 – 10.2.54.142	10.2.54.143
211	10.2.54.144/29	10.2.54.145 – 10.2.54.150	10.2.54.151
212	10.2.54.152/29	10.2.54.153 – 10.2.54.158	10.2.54.159
213	10.2.54.160/29	10.2.54.161 – 10.2.54.166	10.2.54.167
214	10.2.54.168/29	10.2.54.169 – 10.2.54.174	10.2.54.175
215	10.2.54.176/29	10.2.54.177 – 10.2.54.182	10.2.54.183
216	10.2.54.184/29	10.2.54.185 – 10.2.54.190	10.2.54.191
217	10.2.54.192/29	10.2.54.193 – 10.2.54.198	10.2.54.199
218	10.2.54.200/29	10.2.54.201 – 10.2.54.206	10.2.54.207
219	10.2.54.208/29	10.2.54.209 – 10.2.54.214	10.2.54.215
220	10.2.54.216/29	10.2.54.217 – 10.2.54.222	10.2.54.223
221	10.2.54.224/29	10.2.54.225 – 10.2.54.230	10.2.54.231
222	10.2.54.232/29	10.2.54.233 – 10.2.54.238	10.2.54.239
223	10.2.54.240/29	10.2.54.241 – 10.2.54.246	10.2.54.247
224	10.2.54.248/29	10.2.54.249 – 10.2.54.254	10.2.54.255
225	10.2.55.0/29	10.2.55.1 – 10.2.55.6	10.2.55.7
226	10.2.55.8/29	10.2.55.9 – 10.2.55.14	10.2.55.15
227	10.2.55.16/29	10.2.55.17 – 10.2.55.22	10.2.55.23
228	10.2.55.24/29	10.2.55.25 – 10.2.55.30	10.2.55.31
229	10.2.55.32/29	10.2.55.33 – 10.2.55.38	10.2.55.39
230	10.2.55.40/29	10.2.55.41 – 10.2.55.46	10.2.55.47
231	10.2.55.48/29	10.2.55.49 – 10.2.55.54	10.2.55.55
232	10.2.55.56/29	10.2.55.57 – 10.2.55.62	10.2.55.63
233	10.2.55.64/29	10.2.55.65 – 10.2.55.70	10.2.55.71
234	10.2.55.72/29	10.2.55.73 – 10.2.55.78	10.2.55.79
235	10.2.55.80/29	10.2.55.81 – 10.2.55.86	10.2.55.87
236	10.2.55.88/29	10.2.55.89 – 10.2.55.94	10.2.55.95
237	10.2.55.96/29	10.2.55.97 – 10.2.55.102	10.2.55.103
238	10.2.55.104/29	10.2.55.105 – 10.2.55.110	10.2.55.111
239	10.2.55.112/29	10.2.55.113 – 10.2.55.118	10.2.55.119
240	10.2.55.120/29	10.2.55.121 – 10.2.55.126	10.2.55.127
241	10.2.55.128/29	10.2.55.129 – 10.2.55.134	10.2.55.135
242	10.2.55.136/29	10.2.55.137 – 10.2.55.142	10.2.55.143
243	10.2.55.144/29	10.2.55.145 – 10.2.55.150	10.2.55.151
244	10.2.55.152/29	10.2.55.153 – 10.2.55.158	10.2.55.159
245	10.2.55.160/29	10.2.55.161 – 10.2.55.166	10.2.55.167
246	10.2.55.168/29	10.2.55.169 – 10.2.55.174	10.2.55.175
247	10.2.55.176/29	10.2.55.177 – 10.2.55.182	10.2.55.183
248	10.2.55.184/29	10.2.55.185 – 10.2.55.190	10.2.55.191
249	10.2.55.192/29	10.2.55.193 – 10.2.55.198	10.2.55.199
250	10.2.55.200/29	10.2.55.201 – 10.2.55.206	10.2.55.207
251	10.2.55.208/29	10.2.55.209 – 10.2.55.214	10.2.55.215
252	10.2.55.216/29	10.2.55.217 – 10.2.55.222	10.2.55.223
253	10.2.55.224/29	10.2.55.225 – 10.2.55.230	10.2.55.231
254	10.2.55.232/29	10.2.55.233 – 10.2.55.238	10.2.55.239
255	10.2.55.240/29	10.2.55.241 – 10.2.55.246	10.2.55.247
256	10.2.55.248/29	10.2.55.249 – 10.2.55.254	10.2.55.255

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 →