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)10.2.152.0/21

network10.2.152.0/21

broadcast10.2.159.255

first host10.2.152.1

last host10.2.159.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.152.0/21

address00001010.00000010.10011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.10011000.00000000

broadcast00001010.00000010.10011111.11111111

green = network part, grey = host part

hex0x0a029800

decimal167942144

reverse dns0.152.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.152.0/29	10.2.152.1 – 10.2.152.6	10.2.152.7
2	10.2.152.8/29	10.2.152.9 – 10.2.152.14	10.2.152.15
3	10.2.152.16/29	10.2.152.17 – 10.2.152.22	10.2.152.23
4	10.2.152.24/29	10.2.152.25 – 10.2.152.30	10.2.152.31
5	10.2.152.32/29	10.2.152.33 – 10.2.152.38	10.2.152.39
6	10.2.152.40/29	10.2.152.41 – 10.2.152.46	10.2.152.47
7	10.2.152.48/29	10.2.152.49 – 10.2.152.54	10.2.152.55
8	10.2.152.56/29	10.2.152.57 – 10.2.152.62	10.2.152.63
9	10.2.152.64/29	10.2.152.65 – 10.2.152.70	10.2.152.71
10	10.2.152.72/29	10.2.152.73 – 10.2.152.78	10.2.152.79
11	10.2.152.80/29	10.2.152.81 – 10.2.152.86	10.2.152.87
12	10.2.152.88/29	10.2.152.89 – 10.2.152.94	10.2.152.95
13	10.2.152.96/29	10.2.152.97 – 10.2.152.102	10.2.152.103
14	10.2.152.104/29	10.2.152.105 – 10.2.152.110	10.2.152.111
15	10.2.152.112/29	10.2.152.113 – 10.2.152.118	10.2.152.119
16	10.2.152.120/29	10.2.152.121 – 10.2.152.126	10.2.152.127
17	10.2.152.128/29	10.2.152.129 – 10.2.152.134	10.2.152.135
18	10.2.152.136/29	10.2.152.137 – 10.2.152.142	10.2.152.143
19	10.2.152.144/29	10.2.152.145 – 10.2.152.150	10.2.152.151
20	10.2.152.152/29	10.2.152.153 – 10.2.152.158	10.2.152.159
21	10.2.152.160/29	10.2.152.161 – 10.2.152.166	10.2.152.167
22	10.2.152.168/29	10.2.152.169 – 10.2.152.174	10.2.152.175
23	10.2.152.176/29	10.2.152.177 – 10.2.152.182	10.2.152.183
24	10.2.152.184/29	10.2.152.185 – 10.2.152.190	10.2.152.191
25	10.2.152.192/29	10.2.152.193 – 10.2.152.198	10.2.152.199
26	10.2.152.200/29	10.2.152.201 – 10.2.152.206	10.2.152.207
27	10.2.152.208/29	10.2.152.209 – 10.2.152.214	10.2.152.215
28	10.2.152.216/29	10.2.152.217 – 10.2.152.222	10.2.152.223
29	10.2.152.224/29	10.2.152.225 – 10.2.152.230	10.2.152.231
30	10.2.152.232/29	10.2.152.233 – 10.2.152.238	10.2.152.239
31	10.2.152.240/29	10.2.152.241 – 10.2.152.246	10.2.152.247
32	10.2.152.248/29	10.2.152.249 – 10.2.152.254	10.2.152.255
33	10.2.153.0/29	10.2.153.1 – 10.2.153.6	10.2.153.7
34	10.2.153.8/29	10.2.153.9 – 10.2.153.14	10.2.153.15
35	10.2.153.16/29	10.2.153.17 – 10.2.153.22	10.2.153.23
36	10.2.153.24/29	10.2.153.25 – 10.2.153.30	10.2.153.31
37	10.2.153.32/29	10.2.153.33 – 10.2.153.38	10.2.153.39
38	10.2.153.40/29	10.2.153.41 – 10.2.153.46	10.2.153.47
39	10.2.153.48/29	10.2.153.49 – 10.2.153.54	10.2.153.55
40	10.2.153.56/29	10.2.153.57 – 10.2.153.62	10.2.153.63
41	10.2.153.64/29	10.2.153.65 – 10.2.153.70	10.2.153.71
42	10.2.153.72/29	10.2.153.73 – 10.2.153.78	10.2.153.79
43	10.2.153.80/29	10.2.153.81 – 10.2.153.86	10.2.153.87
44	10.2.153.88/29	10.2.153.89 – 10.2.153.94	10.2.153.95
45	10.2.153.96/29	10.2.153.97 – 10.2.153.102	10.2.153.103
46	10.2.153.104/29	10.2.153.105 – 10.2.153.110	10.2.153.111
47	10.2.153.112/29	10.2.153.113 – 10.2.153.118	10.2.153.119
48	10.2.153.120/29	10.2.153.121 – 10.2.153.126	10.2.153.127
49	10.2.153.128/29	10.2.153.129 – 10.2.153.134	10.2.153.135
50	10.2.153.136/29	10.2.153.137 – 10.2.153.142	10.2.153.143
51	10.2.153.144/29	10.2.153.145 – 10.2.153.150	10.2.153.151
52	10.2.153.152/29	10.2.153.153 – 10.2.153.158	10.2.153.159
53	10.2.153.160/29	10.2.153.161 – 10.2.153.166	10.2.153.167
54	10.2.153.168/29	10.2.153.169 – 10.2.153.174	10.2.153.175
55	10.2.153.176/29	10.2.153.177 – 10.2.153.182	10.2.153.183
56	10.2.153.184/29	10.2.153.185 – 10.2.153.190	10.2.153.191
57	10.2.153.192/29	10.2.153.193 – 10.2.153.198	10.2.153.199
58	10.2.153.200/29	10.2.153.201 – 10.2.153.206	10.2.153.207
59	10.2.153.208/29	10.2.153.209 – 10.2.153.214	10.2.153.215
60	10.2.153.216/29	10.2.153.217 – 10.2.153.222	10.2.153.223
61	10.2.153.224/29	10.2.153.225 – 10.2.153.230	10.2.153.231
62	10.2.153.232/29	10.2.153.233 – 10.2.153.238	10.2.153.239
63	10.2.153.240/29	10.2.153.241 – 10.2.153.246	10.2.153.247
64	10.2.153.248/29	10.2.153.249 – 10.2.153.254	10.2.153.255
65	10.2.154.0/29	10.2.154.1 – 10.2.154.6	10.2.154.7
66	10.2.154.8/29	10.2.154.9 – 10.2.154.14	10.2.154.15
67	10.2.154.16/29	10.2.154.17 – 10.2.154.22	10.2.154.23
68	10.2.154.24/29	10.2.154.25 – 10.2.154.30	10.2.154.31
69	10.2.154.32/29	10.2.154.33 – 10.2.154.38	10.2.154.39
70	10.2.154.40/29	10.2.154.41 – 10.2.154.46	10.2.154.47
71	10.2.154.48/29	10.2.154.49 – 10.2.154.54	10.2.154.55
72	10.2.154.56/29	10.2.154.57 – 10.2.154.62	10.2.154.63
73	10.2.154.64/29	10.2.154.65 – 10.2.154.70	10.2.154.71
74	10.2.154.72/29	10.2.154.73 – 10.2.154.78	10.2.154.79
75	10.2.154.80/29	10.2.154.81 – 10.2.154.86	10.2.154.87
76	10.2.154.88/29	10.2.154.89 – 10.2.154.94	10.2.154.95
77	10.2.154.96/29	10.2.154.97 – 10.2.154.102	10.2.154.103
78	10.2.154.104/29	10.2.154.105 – 10.2.154.110	10.2.154.111
79	10.2.154.112/29	10.2.154.113 – 10.2.154.118	10.2.154.119
80	10.2.154.120/29	10.2.154.121 – 10.2.154.126	10.2.154.127
81	10.2.154.128/29	10.2.154.129 – 10.2.154.134	10.2.154.135
82	10.2.154.136/29	10.2.154.137 – 10.2.154.142	10.2.154.143
83	10.2.154.144/29	10.2.154.145 – 10.2.154.150	10.2.154.151
84	10.2.154.152/29	10.2.154.153 – 10.2.154.158	10.2.154.159
85	10.2.154.160/29	10.2.154.161 – 10.2.154.166	10.2.154.167
86	10.2.154.168/29	10.2.154.169 – 10.2.154.174	10.2.154.175
87	10.2.154.176/29	10.2.154.177 – 10.2.154.182	10.2.154.183
88	10.2.154.184/29	10.2.154.185 – 10.2.154.190	10.2.154.191
89	10.2.154.192/29	10.2.154.193 – 10.2.154.198	10.2.154.199
90	10.2.154.200/29	10.2.154.201 – 10.2.154.206	10.2.154.207
91	10.2.154.208/29	10.2.154.209 – 10.2.154.214	10.2.154.215
92	10.2.154.216/29	10.2.154.217 – 10.2.154.222	10.2.154.223
93	10.2.154.224/29	10.2.154.225 – 10.2.154.230	10.2.154.231
94	10.2.154.232/29	10.2.154.233 – 10.2.154.238	10.2.154.239
95	10.2.154.240/29	10.2.154.241 – 10.2.154.246	10.2.154.247
96	10.2.154.248/29	10.2.154.249 – 10.2.154.254	10.2.154.255
97	10.2.155.0/29	10.2.155.1 – 10.2.155.6	10.2.155.7
98	10.2.155.8/29	10.2.155.9 – 10.2.155.14	10.2.155.15
99	10.2.155.16/29	10.2.155.17 – 10.2.155.22	10.2.155.23
100	10.2.155.24/29	10.2.155.25 – 10.2.155.30	10.2.155.31
101	10.2.155.32/29	10.2.155.33 – 10.2.155.38	10.2.155.39
102	10.2.155.40/29	10.2.155.41 – 10.2.155.46	10.2.155.47
103	10.2.155.48/29	10.2.155.49 – 10.2.155.54	10.2.155.55
104	10.2.155.56/29	10.2.155.57 – 10.2.155.62	10.2.155.63
105	10.2.155.64/29	10.2.155.65 – 10.2.155.70	10.2.155.71
106	10.2.155.72/29	10.2.155.73 – 10.2.155.78	10.2.155.79
107	10.2.155.80/29	10.2.155.81 – 10.2.155.86	10.2.155.87
108	10.2.155.88/29	10.2.155.89 – 10.2.155.94	10.2.155.95
109	10.2.155.96/29	10.2.155.97 – 10.2.155.102	10.2.155.103
110	10.2.155.104/29	10.2.155.105 – 10.2.155.110	10.2.155.111
111	10.2.155.112/29	10.2.155.113 – 10.2.155.118	10.2.155.119
112	10.2.155.120/29	10.2.155.121 – 10.2.155.126	10.2.155.127
113	10.2.155.128/29	10.2.155.129 – 10.2.155.134	10.2.155.135
114	10.2.155.136/29	10.2.155.137 – 10.2.155.142	10.2.155.143
115	10.2.155.144/29	10.2.155.145 – 10.2.155.150	10.2.155.151
116	10.2.155.152/29	10.2.155.153 – 10.2.155.158	10.2.155.159
117	10.2.155.160/29	10.2.155.161 – 10.2.155.166	10.2.155.167
118	10.2.155.168/29	10.2.155.169 – 10.2.155.174	10.2.155.175
119	10.2.155.176/29	10.2.155.177 – 10.2.155.182	10.2.155.183
120	10.2.155.184/29	10.2.155.185 – 10.2.155.190	10.2.155.191
121	10.2.155.192/29	10.2.155.193 – 10.2.155.198	10.2.155.199
122	10.2.155.200/29	10.2.155.201 – 10.2.155.206	10.2.155.207
123	10.2.155.208/29	10.2.155.209 – 10.2.155.214	10.2.155.215
124	10.2.155.216/29	10.2.155.217 – 10.2.155.222	10.2.155.223
125	10.2.155.224/29	10.2.155.225 – 10.2.155.230	10.2.155.231
126	10.2.155.232/29	10.2.155.233 – 10.2.155.238	10.2.155.239
127	10.2.155.240/29	10.2.155.241 – 10.2.155.246	10.2.155.247
128	10.2.155.248/29	10.2.155.249 – 10.2.155.254	10.2.155.255
129	10.2.156.0/29	10.2.156.1 – 10.2.156.6	10.2.156.7
130	10.2.156.8/29	10.2.156.9 – 10.2.156.14	10.2.156.15
131	10.2.156.16/29	10.2.156.17 – 10.2.156.22	10.2.156.23
132	10.2.156.24/29	10.2.156.25 – 10.2.156.30	10.2.156.31
133	10.2.156.32/29	10.2.156.33 – 10.2.156.38	10.2.156.39
134	10.2.156.40/29	10.2.156.41 – 10.2.156.46	10.2.156.47
135	10.2.156.48/29	10.2.156.49 – 10.2.156.54	10.2.156.55
136	10.2.156.56/29	10.2.156.57 – 10.2.156.62	10.2.156.63
137	10.2.156.64/29	10.2.156.65 – 10.2.156.70	10.2.156.71
138	10.2.156.72/29	10.2.156.73 – 10.2.156.78	10.2.156.79
139	10.2.156.80/29	10.2.156.81 – 10.2.156.86	10.2.156.87
140	10.2.156.88/29	10.2.156.89 – 10.2.156.94	10.2.156.95
141	10.2.156.96/29	10.2.156.97 – 10.2.156.102	10.2.156.103
142	10.2.156.104/29	10.2.156.105 – 10.2.156.110	10.2.156.111
143	10.2.156.112/29	10.2.156.113 – 10.2.156.118	10.2.156.119
144	10.2.156.120/29	10.2.156.121 – 10.2.156.126	10.2.156.127
145	10.2.156.128/29	10.2.156.129 – 10.2.156.134	10.2.156.135
146	10.2.156.136/29	10.2.156.137 – 10.2.156.142	10.2.156.143
147	10.2.156.144/29	10.2.156.145 – 10.2.156.150	10.2.156.151
148	10.2.156.152/29	10.2.156.153 – 10.2.156.158	10.2.156.159
149	10.2.156.160/29	10.2.156.161 – 10.2.156.166	10.2.156.167
150	10.2.156.168/29	10.2.156.169 – 10.2.156.174	10.2.156.175
151	10.2.156.176/29	10.2.156.177 – 10.2.156.182	10.2.156.183
152	10.2.156.184/29	10.2.156.185 – 10.2.156.190	10.2.156.191
153	10.2.156.192/29	10.2.156.193 – 10.2.156.198	10.2.156.199
154	10.2.156.200/29	10.2.156.201 – 10.2.156.206	10.2.156.207
155	10.2.156.208/29	10.2.156.209 – 10.2.156.214	10.2.156.215
156	10.2.156.216/29	10.2.156.217 – 10.2.156.222	10.2.156.223
157	10.2.156.224/29	10.2.156.225 – 10.2.156.230	10.2.156.231
158	10.2.156.232/29	10.2.156.233 – 10.2.156.238	10.2.156.239
159	10.2.156.240/29	10.2.156.241 – 10.2.156.246	10.2.156.247
160	10.2.156.248/29	10.2.156.249 – 10.2.156.254	10.2.156.255
161	10.2.157.0/29	10.2.157.1 – 10.2.157.6	10.2.157.7
162	10.2.157.8/29	10.2.157.9 – 10.2.157.14	10.2.157.15
163	10.2.157.16/29	10.2.157.17 – 10.2.157.22	10.2.157.23
164	10.2.157.24/29	10.2.157.25 – 10.2.157.30	10.2.157.31
165	10.2.157.32/29	10.2.157.33 – 10.2.157.38	10.2.157.39
166	10.2.157.40/29	10.2.157.41 – 10.2.157.46	10.2.157.47
167	10.2.157.48/29	10.2.157.49 – 10.2.157.54	10.2.157.55
168	10.2.157.56/29	10.2.157.57 – 10.2.157.62	10.2.157.63
169	10.2.157.64/29	10.2.157.65 – 10.2.157.70	10.2.157.71
170	10.2.157.72/29	10.2.157.73 – 10.2.157.78	10.2.157.79
171	10.2.157.80/29	10.2.157.81 – 10.2.157.86	10.2.157.87
172	10.2.157.88/29	10.2.157.89 – 10.2.157.94	10.2.157.95
173	10.2.157.96/29	10.2.157.97 – 10.2.157.102	10.2.157.103
174	10.2.157.104/29	10.2.157.105 – 10.2.157.110	10.2.157.111
175	10.2.157.112/29	10.2.157.113 – 10.2.157.118	10.2.157.119
176	10.2.157.120/29	10.2.157.121 – 10.2.157.126	10.2.157.127
177	10.2.157.128/29	10.2.157.129 – 10.2.157.134	10.2.157.135
178	10.2.157.136/29	10.2.157.137 – 10.2.157.142	10.2.157.143
179	10.2.157.144/29	10.2.157.145 – 10.2.157.150	10.2.157.151
180	10.2.157.152/29	10.2.157.153 – 10.2.157.158	10.2.157.159
181	10.2.157.160/29	10.2.157.161 – 10.2.157.166	10.2.157.167
182	10.2.157.168/29	10.2.157.169 – 10.2.157.174	10.2.157.175
183	10.2.157.176/29	10.2.157.177 – 10.2.157.182	10.2.157.183
184	10.2.157.184/29	10.2.157.185 – 10.2.157.190	10.2.157.191
185	10.2.157.192/29	10.2.157.193 – 10.2.157.198	10.2.157.199
186	10.2.157.200/29	10.2.157.201 – 10.2.157.206	10.2.157.207
187	10.2.157.208/29	10.2.157.209 – 10.2.157.214	10.2.157.215
188	10.2.157.216/29	10.2.157.217 – 10.2.157.222	10.2.157.223
189	10.2.157.224/29	10.2.157.225 – 10.2.157.230	10.2.157.231
190	10.2.157.232/29	10.2.157.233 – 10.2.157.238	10.2.157.239
191	10.2.157.240/29	10.2.157.241 – 10.2.157.246	10.2.157.247
192	10.2.157.248/29	10.2.157.249 – 10.2.157.254	10.2.157.255
193	10.2.158.0/29	10.2.158.1 – 10.2.158.6	10.2.158.7
194	10.2.158.8/29	10.2.158.9 – 10.2.158.14	10.2.158.15
195	10.2.158.16/29	10.2.158.17 – 10.2.158.22	10.2.158.23
196	10.2.158.24/29	10.2.158.25 – 10.2.158.30	10.2.158.31
197	10.2.158.32/29	10.2.158.33 – 10.2.158.38	10.2.158.39
198	10.2.158.40/29	10.2.158.41 – 10.2.158.46	10.2.158.47
199	10.2.158.48/29	10.2.158.49 – 10.2.158.54	10.2.158.55
200	10.2.158.56/29	10.2.158.57 – 10.2.158.62	10.2.158.63
201	10.2.158.64/29	10.2.158.65 – 10.2.158.70	10.2.158.71
202	10.2.158.72/29	10.2.158.73 – 10.2.158.78	10.2.158.79
203	10.2.158.80/29	10.2.158.81 – 10.2.158.86	10.2.158.87
204	10.2.158.88/29	10.2.158.89 – 10.2.158.94	10.2.158.95
205	10.2.158.96/29	10.2.158.97 – 10.2.158.102	10.2.158.103
206	10.2.158.104/29	10.2.158.105 – 10.2.158.110	10.2.158.111
207	10.2.158.112/29	10.2.158.113 – 10.2.158.118	10.2.158.119
208	10.2.158.120/29	10.2.158.121 – 10.2.158.126	10.2.158.127
209	10.2.158.128/29	10.2.158.129 – 10.2.158.134	10.2.158.135
210	10.2.158.136/29	10.2.158.137 – 10.2.158.142	10.2.158.143
211	10.2.158.144/29	10.2.158.145 – 10.2.158.150	10.2.158.151
212	10.2.158.152/29	10.2.158.153 – 10.2.158.158	10.2.158.159
213	10.2.158.160/29	10.2.158.161 – 10.2.158.166	10.2.158.167
214	10.2.158.168/29	10.2.158.169 – 10.2.158.174	10.2.158.175
215	10.2.158.176/29	10.2.158.177 – 10.2.158.182	10.2.158.183
216	10.2.158.184/29	10.2.158.185 – 10.2.158.190	10.2.158.191
217	10.2.158.192/29	10.2.158.193 – 10.2.158.198	10.2.158.199
218	10.2.158.200/29	10.2.158.201 – 10.2.158.206	10.2.158.207
219	10.2.158.208/29	10.2.158.209 – 10.2.158.214	10.2.158.215
220	10.2.158.216/29	10.2.158.217 – 10.2.158.222	10.2.158.223
221	10.2.158.224/29	10.2.158.225 – 10.2.158.230	10.2.158.231
222	10.2.158.232/29	10.2.158.233 – 10.2.158.238	10.2.158.239
223	10.2.158.240/29	10.2.158.241 – 10.2.158.246	10.2.158.247
224	10.2.158.248/29	10.2.158.249 – 10.2.158.254	10.2.158.255
225	10.2.159.0/29	10.2.159.1 – 10.2.159.6	10.2.159.7
226	10.2.159.8/29	10.2.159.9 – 10.2.159.14	10.2.159.15
227	10.2.159.16/29	10.2.159.17 – 10.2.159.22	10.2.159.23
228	10.2.159.24/29	10.2.159.25 – 10.2.159.30	10.2.159.31
229	10.2.159.32/29	10.2.159.33 – 10.2.159.38	10.2.159.39
230	10.2.159.40/29	10.2.159.41 – 10.2.159.46	10.2.159.47
231	10.2.159.48/29	10.2.159.49 – 10.2.159.54	10.2.159.55
232	10.2.159.56/29	10.2.159.57 – 10.2.159.62	10.2.159.63
233	10.2.159.64/29	10.2.159.65 – 10.2.159.70	10.2.159.71
234	10.2.159.72/29	10.2.159.73 – 10.2.159.78	10.2.159.79
235	10.2.159.80/29	10.2.159.81 – 10.2.159.86	10.2.159.87
236	10.2.159.88/29	10.2.159.89 – 10.2.159.94	10.2.159.95
237	10.2.159.96/29	10.2.159.97 – 10.2.159.102	10.2.159.103
238	10.2.159.104/29	10.2.159.105 – 10.2.159.110	10.2.159.111
239	10.2.159.112/29	10.2.159.113 – 10.2.159.118	10.2.159.119
240	10.2.159.120/29	10.2.159.121 – 10.2.159.126	10.2.159.127
241	10.2.159.128/29	10.2.159.129 – 10.2.159.134	10.2.159.135
242	10.2.159.136/29	10.2.159.137 – 10.2.159.142	10.2.159.143
243	10.2.159.144/29	10.2.159.145 – 10.2.159.150	10.2.159.151
244	10.2.159.152/29	10.2.159.153 – 10.2.159.158	10.2.159.159
245	10.2.159.160/29	10.2.159.161 – 10.2.159.166	10.2.159.167
246	10.2.159.168/29	10.2.159.169 – 10.2.159.174	10.2.159.175
247	10.2.159.176/29	10.2.159.177 – 10.2.159.182	10.2.159.183
248	10.2.159.184/29	10.2.159.185 – 10.2.159.190	10.2.159.191
249	10.2.159.192/29	10.2.159.193 – 10.2.159.198	10.2.159.199
250	10.2.159.200/29	10.2.159.201 – 10.2.159.206	10.2.159.207
251	10.2.159.208/29	10.2.159.209 – 10.2.159.214	10.2.159.215
252	10.2.159.216/29	10.2.159.217 – 10.2.159.222	10.2.159.223
253	10.2.159.224/29	10.2.159.225 – 10.2.159.230	10.2.159.231
254	10.2.159.232/29	10.2.159.233 – 10.2.159.238	10.2.159.239
255	10.2.159.240/29	10.2.159.241 – 10.2.159.246	10.2.159.247
256	10.2.159.248/29	10.2.159.249 – 10.2.159.254	10.2.159.255

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 →