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 /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.152.0/30	10.2.152.1 – 10.2.152.2	10.2.152.3
2	10.2.152.4/30	10.2.152.5 – 10.2.152.6	10.2.152.7
3	10.2.152.8/30	10.2.152.9 – 10.2.152.10	10.2.152.11
4	10.2.152.12/30	10.2.152.13 – 10.2.152.14	10.2.152.15
5	10.2.152.16/30	10.2.152.17 – 10.2.152.18	10.2.152.19
6	10.2.152.20/30	10.2.152.21 – 10.2.152.22	10.2.152.23
7	10.2.152.24/30	10.2.152.25 – 10.2.152.26	10.2.152.27
8	10.2.152.28/30	10.2.152.29 – 10.2.152.30	10.2.152.31
9	10.2.152.32/30	10.2.152.33 – 10.2.152.34	10.2.152.35
10	10.2.152.36/30	10.2.152.37 – 10.2.152.38	10.2.152.39
11	10.2.152.40/30	10.2.152.41 – 10.2.152.42	10.2.152.43
12	10.2.152.44/30	10.2.152.45 – 10.2.152.46	10.2.152.47
13	10.2.152.48/30	10.2.152.49 – 10.2.152.50	10.2.152.51
14	10.2.152.52/30	10.2.152.53 – 10.2.152.54	10.2.152.55
15	10.2.152.56/30	10.2.152.57 – 10.2.152.58	10.2.152.59
16	10.2.152.60/30	10.2.152.61 – 10.2.152.62	10.2.152.63
17	10.2.152.64/30	10.2.152.65 – 10.2.152.66	10.2.152.67
18	10.2.152.68/30	10.2.152.69 – 10.2.152.70	10.2.152.71
19	10.2.152.72/30	10.2.152.73 – 10.2.152.74	10.2.152.75
20	10.2.152.76/30	10.2.152.77 – 10.2.152.78	10.2.152.79
21	10.2.152.80/30	10.2.152.81 – 10.2.152.82	10.2.152.83
22	10.2.152.84/30	10.2.152.85 – 10.2.152.86	10.2.152.87
23	10.2.152.88/30	10.2.152.89 – 10.2.152.90	10.2.152.91
24	10.2.152.92/30	10.2.152.93 – 10.2.152.94	10.2.152.95
25	10.2.152.96/30	10.2.152.97 – 10.2.152.98	10.2.152.99
26	10.2.152.100/30	10.2.152.101 – 10.2.152.102	10.2.152.103
27	10.2.152.104/30	10.2.152.105 – 10.2.152.106	10.2.152.107
28	10.2.152.108/30	10.2.152.109 – 10.2.152.110	10.2.152.111
29	10.2.152.112/30	10.2.152.113 – 10.2.152.114	10.2.152.115
30	10.2.152.116/30	10.2.152.117 – 10.2.152.118	10.2.152.119
31	10.2.152.120/30	10.2.152.121 – 10.2.152.122	10.2.152.123
32	10.2.152.124/30	10.2.152.125 – 10.2.152.126	10.2.152.127
33	10.2.152.128/30	10.2.152.129 – 10.2.152.130	10.2.152.131
34	10.2.152.132/30	10.2.152.133 – 10.2.152.134	10.2.152.135
35	10.2.152.136/30	10.2.152.137 – 10.2.152.138	10.2.152.139
36	10.2.152.140/30	10.2.152.141 – 10.2.152.142	10.2.152.143
37	10.2.152.144/30	10.2.152.145 – 10.2.152.146	10.2.152.147
38	10.2.152.148/30	10.2.152.149 – 10.2.152.150	10.2.152.151
39	10.2.152.152/30	10.2.152.153 – 10.2.152.154	10.2.152.155
40	10.2.152.156/30	10.2.152.157 – 10.2.152.158	10.2.152.159
41	10.2.152.160/30	10.2.152.161 – 10.2.152.162	10.2.152.163
42	10.2.152.164/30	10.2.152.165 – 10.2.152.166	10.2.152.167
43	10.2.152.168/30	10.2.152.169 – 10.2.152.170	10.2.152.171
44	10.2.152.172/30	10.2.152.173 – 10.2.152.174	10.2.152.175
45	10.2.152.176/30	10.2.152.177 – 10.2.152.178	10.2.152.179
46	10.2.152.180/30	10.2.152.181 – 10.2.152.182	10.2.152.183
47	10.2.152.184/30	10.2.152.185 – 10.2.152.186	10.2.152.187
48	10.2.152.188/30	10.2.152.189 – 10.2.152.190	10.2.152.191
49	10.2.152.192/30	10.2.152.193 – 10.2.152.194	10.2.152.195
50	10.2.152.196/30	10.2.152.197 – 10.2.152.198	10.2.152.199
51	10.2.152.200/30	10.2.152.201 – 10.2.152.202	10.2.152.203
52	10.2.152.204/30	10.2.152.205 – 10.2.152.206	10.2.152.207
53	10.2.152.208/30	10.2.152.209 – 10.2.152.210	10.2.152.211
54	10.2.152.212/30	10.2.152.213 – 10.2.152.214	10.2.152.215
55	10.2.152.216/30	10.2.152.217 – 10.2.152.218	10.2.152.219
56	10.2.152.220/30	10.2.152.221 – 10.2.152.222	10.2.152.223
57	10.2.152.224/30	10.2.152.225 – 10.2.152.226	10.2.152.227
58	10.2.152.228/30	10.2.152.229 – 10.2.152.230	10.2.152.231
59	10.2.152.232/30	10.2.152.233 – 10.2.152.234	10.2.152.235
60	10.2.152.236/30	10.2.152.237 – 10.2.152.238	10.2.152.239
61	10.2.152.240/30	10.2.152.241 – 10.2.152.242	10.2.152.243
62	10.2.152.244/30	10.2.152.245 – 10.2.152.246	10.2.152.247
63	10.2.152.248/30	10.2.152.249 – 10.2.152.250	10.2.152.251
64	10.2.152.252/30	10.2.152.253 – 10.2.152.254	10.2.152.255
65	10.2.153.0/30	10.2.153.1 – 10.2.153.2	10.2.153.3
66	10.2.153.4/30	10.2.153.5 – 10.2.153.6	10.2.153.7
67	10.2.153.8/30	10.2.153.9 – 10.2.153.10	10.2.153.11
68	10.2.153.12/30	10.2.153.13 – 10.2.153.14	10.2.153.15
69	10.2.153.16/30	10.2.153.17 – 10.2.153.18	10.2.153.19
70	10.2.153.20/30	10.2.153.21 – 10.2.153.22	10.2.153.23
71	10.2.153.24/30	10.2.153.25 – 10.2.153.26	10.2.153.27
72	10.2.153.28/30	10.2.153.29 – 10.2.153.30	10.2.153.31
73	10.2.153.32/30	10.2.153.33 – 10.2.153.34	10.2.153.35
74	10.2.153.36/30	10.2.153.37 – 10.2.153.38	10.2.153.39
75	10.2.153.40/30	10.2.153.41 – 10.2.153.42	10.2.153.43
76	10.2.153.44/30	10.2.153.45 – 10.2.153.46	10.2.153.47
77	10.2.153.48/30	10.2.153.49 – 10.2.153.50	10.2.153.51
78	10.2.153.52/30	10.2.153.53 – 10.2.153.54	10.2.153.55
79	10.2.153.56/30	10.2.153.57 – 10.2.153.58	10.2.153.59
80	10.2.153.60/30	10.2.153.61 – 10.2.153.62	10.2.153.63
81	10.2.153.64/30	10.2.153.65 – 10.2.153.66	10.2.153.67
82	10.2.153.68/30	10.2.153.69 – 10.2.153.70	10.2.153.71
83	10.2.153.72/30	10.2.153.73 – 10.2.153.74	10.2.153.75
84	10.2.153.76/30	10.2.153.77 – 10.2.153.78	10.2.153.79
85	10.2.153.80/30	10.2.153.81 – 10.2.153.82	10.2.153.83
86	10.2.153.84/30	10.2.153.85 – 10.2.153.86	10.2.153.87
87	10.2.153.88/30	10.2.153.89 – 10.2.153.90	10.2.153.91
88	10.2.153.92/30	10.2.153.93 – 10.2.153.94	10.2.153.95
89	10.2.153.96/30	10.2.153.97 – 10.2.153.98	10.2.153.99
90	10.2.153.100/30	10.2.153.101 – 10.2.153.102	10.2.153.103
91	10.2.153.104/30	10.2.153.105 – 10.2.153.106	10.2.153.107
92	10.2.153.108/30	10.2.153.109 – 10.2.153.110	10.2.153.111
93	10.2.153.112/30	10.2.153.113 – 10.2.153.114	10.2.153.115
94	10.2.153.116/30	10.2.153.117 – 10.2.153.118	10.2.153.119
95	10.2.153.120/30	10.2.153.121 – 10.2.153.122	10.2.153.123
96	10.2.153.124/30	10.2.153.125 – 10.2.153.126	10.2.153.127
97	10.2.153.128/30	10.2.153.129 – 10.2.153.130	10.2.153.131
98	10.2.153.132/30	10.2.153.133 – 10.2.153.134	10.2.153.135
99	10.2.153.136/30	10.2.153.137 – 10.2.153.138	10.2.153.139
100	10.2.153.140/30	10.2.153.141 – 10.2.153.142	10.2.153.143
101	10.2.153.144/30	10.2.153.145 – 10.2.153.146	10.2.153.147
102	10.2.153.148/30	10.2.153.149 – 10.2.153.150	10.2.153.151
103	10.2.153.152/30	10.2.153.153 – 10.2.153.154	10.2.153.155
104	10.2.153.156/30	10.2.153.157 – 10.2.153.158	10.2.153.159
105	10.2.153.160/30	10.2.153.161 – 10.2.153.162	10.2.153.163
106	10.2.153.164/30	10.2.153.165 – 10.2.153.166	10.2.153.167
107	10.2.153.168/30	10.2.153.169 – 10.2.153.170	10.2.153.171
108	10.2.153.172/30	10.2.153.173 – 10.2.153.174	10.2.153.175
109	10.2.153.176/30	10.2.153.177 – 10.2.153.178	10.2.153.179
110	10.2.153.180/30	10.2.153.181 – 10.2.153.182	10.2.153.183
111	10.2.153.184/30	10.2.153.185 – 10.2.153.186	10.2.153.187
112	10.2.153.188/30	10.2.153.189 – 10.2.153.190	10.2.153.191
113	10.2.153.192/30	10.2.153.193 – 10.2.153.194	10.2.153.195
114	10.2.153.196/30	10.2.153.197 – 10.2.153.198	10.2.153.199
115	10.2.153.200/30	10.2.153.201 – 10.2.153.202	10.2.153.203
116	10.2.153.204/30	10.2.153.205 – 10.2.153.206	10.2.153.207
117	10.2.153.208/30	10.2.153.209 – 10.2.153.210	10.2.153.211
118	10.2.153.212/30	10.2.153.213 – 10.2.153.214	10.2.153.215
119	10.2.153.216/30	10.2.153.217 – 10.2.153.218	10.2.153.219
120	10.2.153.220/30	10.2.153.221 – 10.2.153.222	10.2.153.223
121	10.2.153.224/30	10.2.153.225 – 10.2.153.226	10.2.153.227
122	10.2.153.228/30	10.2.153.229 – 10.2.153.230	10.2.153.231
123	10.2.153.232/30	10.2.153.233 – 10.2.153.234	10.2.153.235
124	10.2.153.236/30	10.2.153.237 – 10.2.153.238	10.2.153.239
125	10.2.153.240/30	10.2.153.241 – 10.2.153.242	10.2.153.243
126	10.2.153.244/30	10.2.153.245 – 10.2.153.246	10.2.153.247
127	10.2.153.248/30	10.2.153.249 – 10.2.153.250	10.2.153.251
128	10.2.153.252/30	10.2.153.253 – 10.2.153.254	10.2.153.255
129	10.2.154.0/30	10.2.154.1 – 10.2.154.2	10.2.154.3
130	10.2.154.4/30	10.2.154.5 – 10.2.154.6	10.2.154.7
131	10.2.154.8/30	10.2.154.9 – 10.2.154.10	10.2.154.11
132	10.2.154.12/30	10.2.154.13 – 10.2.154.14	10.2.154.15
133	10.2.154.16/30	10.2.154.17 – 10.2.154.18	10.2.154.19
134	10.2.154.20/30	10.2.154.21 – 10.2.154.22	10.2.154.23
135	10.2.154.24/30	10.2.154.25 – 10.2.154.26	10.2.154.27
136	10.2.154.28/30	10.2.154.29 – 10.2.154.30	10.2.154.31
137	10.2.154.32/30	10.2.154.33 – 10.2.154.34	10.2.154.35
138	10.2.154.36/30	10.2.154.37 – 10.2.154.38	10.2.154.39
139	10.2.154.40/30	10.2.154.41 – 10.2.154.42	10.2.154.43
140	10.2.154.44/30	10.2.154.45 – 10.2.154.46	10.2.154.47
141	10.2.154.48/30	10.2.154.49 – 10.2.154.50	10.2.154.51
142	10.2.154.52/30	10.2.154.53 – 10.2.154.54	10.2.154.55
143	10.2.154.56/30	10.2.154.57 – 10.2.154.58	10.2.154.59
144	10.2.154.60/30	10.2.154.61 – 10.2.154.62	10.2.154.63
145	10.2.154.64/30	10.2.154.65 – 10.2.154.66	10.2.154.67
146	10.2.154.68/30	10.2.154.69 – 10.2.154.70	10.2.154.71
147	10.2.154.72/30	10.2.154.73 – 10.2.154.74	10.2.154.75
148	10.2.154.76/30	10.2.154.77 – 10.2.154.78	10.2.154.79
149	10.2.154.80/30	10.2.154.81 – 10.2.154.82	10.2.154.83
150	10.2.154.84/30	10.2.154.85 – 10.2.154.86	10.2.154.87
151	10.2.154.88/30	10.2.154.89 – 10.2.154.90	10.2.154.91
152	10.2.154.92/30	10.2.154.93 – 10.2.154.94	10.2.154.95
153	10.2.154.96/30	10.2.154.97 – 10.2.154.98	10.2.154.99
154	10.2.154.100/30	10.2.154.101 – 10.2.154.102	10.2.154.103
155	10.2.154.104/30	10.2.154.105 – 10.2.154.106	10.2.154.107
156	10.2.154.108/30	10.2.154.109 – 10.2.154.110	10.2.154.111
157	10.2.154.112/30	10.2.154.113 – 10.2.154.114	10.2.154.115
158	10.2.154.116/30	10.2.154.117 – 10.2.154.118	10.2.154.119
159	10.2.154.120/30	10.2.154.121 – 10.2.154.122	10.2.154.123
160	10.2.154.124/30	10.2.154.125 – 10.2.154.126	10.2.154.127
161	10.2.154.128/30	10.2.154.129 – 10.2.154.130	10.2.154.131
162	10.2.154.132/30	10.2.154.133 – 10.2.154.134	10.2.154.135
163	10.2.154.136/30	10.2.154.137 – 10.2.154.138	10.2.154.139
164	10.2.154.140/30	10.2.154.141 – 10.2.154.142	10.2.154.143
165	10.2.154.144/30	10.2.154.145 – 10.2.154.146	10.2.154.147
166	10.2.154.148/30	10.2.154.149 – 10.2.154.150	10.2.154.151
167	10.2.154.152/30	10.2.154.153 – 10.2.154.154	10.2.154.155
168	10.2.154.156/30	10.2.154.157 – 10.2.154.158	10.2.154.159
169	10.2.154.160/30	10.2.154.161 – 10.2.154.162	10.2.154.163
170	10.2.154.164/30	10.2.154.165 – 10.2.154.166	10.2.154.167
171	10.2.154.168/30	10.2.154.169 – 10.2.154.170	10.2.154.171
172	10.2.154.172/30	10.2.154.173 – 10.2.154.174	10.2.154.175
173	10.2.154.176/30	10.2.154.177 – 10.2.154.178	10.2.154.179
174	10.2.154.180/30	10.2.154.181 – 10.2.154.182	10.2.154.183
175	10.2.154.184/30	10.2.154.185 – 10.2.154.186	10.2.154.187
176	10.2.154.188/30	10.2.154.189 – 10.2.154.190	10.2.154.191
177	10.2.154.192/30	10.2.154.193 – 10.2.154.194	10.2.154.195
178	10.2.154.196/30	10.2.154.197 – 10.2.154.198	10.2.154.199
179	10.2.154.200/30	10.2.154.201 – 10.2.154.202	10.2.154.203
180	10.2.154.204/30	10.2.154.205 – 10.2.154.206	10.2.154.207
181	10.2.154.208/30	10.2.154.209 – 10.2.154.210	10.2.154.211
182	10.2.154.212/30	10.2.154.213 – 10.2.154.214	10.2.154.215
183	10.2.154.216/30	10.2.154.217 – 10.2.154.218	10.2.154.219
184	10.2.154.220/30	10.2.154.221 – 10.2.154.222	10.2.154.223
185	10.2.154.224/30	10.2.154.225 – 10.2.154.226	10.2.154.227
186	10.2.154.228/30	10.2.154.229 – 10.2.154.230	10.2.154.231
187	10.2.154.232/30	10.2.154.233 – 10.2.154.234	10.2.154.235
188	10.2.154.236/30	10.2.154.237 – 10.2.154.238	10.2.154.239
189	10.2.154.240/30	10.2.154.241 – 10.2.154.242	10.2.154.243
190	10.2.154.244/30	10.2.154.245 – 10.2.154.246	10.2.154.247
191	10.2.154.248/30	10.2.154.249 – 10.2.154.250	10.2.154.251
192	10.2.154.252/30	10.2.154.253 – 10.2.154.254	10.2.154.255
193	10.2.155.0/30	10.2.155.1 – 10.2.155.2	10.2.155.3
194	10.2.155.4/30	10.2.155.5 – 10.2.155.6	10.2.155.7
195	10.2.155.8/30	10.2.155.9 – 10.2.155.10	10.2.155.11
196	10.2.155.12/30	10.2.155.13 – 10.2.155.14	10.2.155.15
197	10.2.155.16/30	10.2.155.17 – 10.2.155.18	10.2.155.19
198	10.2.155.20/30	10.2.155.21 – 10.2.155.22	10.2.155.23
199	10.2.155.24/30	10.2.155.25 – 10.2.155.26	10.2.155.27
200	10.2.155.28/30	10.2.155.29 – 10.2.155.30	10.2.155.31
201	10.2.155.32/30	10.2.155.33 – 10.2.155.34	10.2.155.35
202	10.2.155.36/30	10.2.155.37 – 10.2.155.38	10.2.155.39
203	10.2.155.40/30	10.2.155.41 – 10.2.155.42	10.2.155.43
204	10.2.155.44/30	10.2.155.45 – 10.2.155.46	10.2.155.47
205	10.2.155.48/30	10.2.155.49 – 10.2.155.50	10.2.155.51
206	10.2.155.52/30	10.2.155.53 – 10.2.155.54	10.2.155.55
207	10.2.155.56/30	10.2.155.57 – 10.2.155.58	10.2.155.59
208	10.2.155.60/30	10.2.155.61 – 10.2.155.62	10.2.155.63
209	10.2.155.64/30	10.2.155.65 – 10.2.155.66	10.2.155.67
210	10.2.155.68/30	10.2.155.69 – 10.2.155.70	10.2.155.71
211	10.2.155.72/30	10.2.155.73 – 10.2.155.74	10.2.155.75
212	10.2.155.76/30	10.2.155.77 – 10.2.155.78	10.2.155.79
213	10.2.155.80/30	10.2.155.81 – 10.2.155.82	10.2.155.83
214	10.2.155.84/30	10.2.155.85 – 10.2.155.86	10.2.155.87
215	10.2.155.88/30	10.2.155.89 – 10.2.155.90	10.2.155.91
216	10.2.155.92/30	10.2.155.93 – 10.2.155.94	10.2.155.95
217	10.2.155.96/30	10.2.155.97 – 10.2.155.98	10.2.155.99
218	10.2.155.100/30	10.2.155.101 – 10.2.155.102	10.2.155.103
219	10.2.155.104/30	10.2.155.105 – 10.2.155.106	10.2.155.107
220	10.2.155.108/30	10.2.155.109 – 10.2.155.110	10.2.155.111
221	10.2.155.112/30	10.2.155.113 – 10.2.155.114	10.2.155.115
222	10.2.155.116/30	10.2.155.117 – 10.2.155.118	10.2.155.119
223	10.2.155.120/30	10.2.155.121 – 10.2.155.122	10.2.155.123
224	10.2.155.124/30	10.2.155.125 – 10.2.155.126	10.2.155.127
225	10.2.155.128/30	10.2.155.129 – 10.2.155.130	10.2.155.131
226	10.2.155.132/30	10.2.155.133 – 10.2.155.134	10.2.155.135
227	10.2.155.136/30	10.2.155.137 – 10.2.155.138	10.2.155.139
228	10.2.155.140/30	10.2.155.141 – 10.2.155.142	10.2.155.143
229	10.2.155.144/30	10.2.155.145 – 10.2.155.146	10.2.155.147
230	10.2.155.148/30	10.2.155.149 – 10.2.155.150	10.2.155.151
231	10.2.155.152/30	10.2.155.153 – 10.2.155.154	10.2.155.155
232	10.2.155.156/30	10.2.155.157 – 10.2.155.158	10.2.155.159
233	10.2.155.160/30	10.2.155.161 – 10.2.155.162	10.2.155.163
234	10.2.155.164/30	10.2.155.165 – 10.2.155.166	10.2.155.167
235	10.2.155.168/30	10.2.155.169 – 10.2.155.170	10.2.155.171
236	10.2.155.172/30	10.2.155.173 – 10.2.155.174	10.2.155.175
237	10.2.155.176/30	10.2.155.177 – 10.2.155.178	10.2.155.179
238	10.2.155.180/30	10.2.155.181 – 10.2.155.182	10.2.155.183
239	10.2.155.184/30	10.2.155.185 – 10.2.155.186	10.2.155.187
240	10.2.155.188/30	10.2.155.189 – 10.2.155.190	10.2.155.191
241	10.2.155.192/30	10.2.155.193 – 10.2.155.194	10.2.155.195
242	10.2.155.196/30	10.2.155.197 – 10.2.155.198	10.2.155.199
243	10.2.155.200/30	10.2.155.201 – 10.2.155.202	10.2.155.203
244	10.2.155.204/30	10.2.155.205 – 10.2.155.206	10.2.155.207
245	10.2.155.208/30	10.2.155.209 – 10.2.155.210	10.2.155.211
246	10.2.155.212/30	10.2.155.213 – 10.2.155.214	10.2.155.215
247	10.2.155.216/30	10.2.155.217 – 10.2.155.218	10.2.155.219
248	10.2.155.220/30	10.2.155.221 – 10.2.155.222	10.2.155.223
249	10.2.155.224/30	10.2.155.225 – 10.2.155.226	10.2.155.227
250	10.2.155.228/30	10.2.155.229 – 10.2.155.230	10.2.155.231
251	10.2.155.232/30	10.2.155.233 – 10.2.155.234	10.2.155.235
252	10.2.155.236/30	10.2.155.237 – 10.2.155.238	10.2.155.239
253	10.2.155.240/30	10.2.155.241 – 10.2.155.242	10.2.155.243
254	10.2.155.244/30	10.2.155.245 – 10.2.155.246	10.2.155.247
255	10.2.155.248/30	10.2.155.249 – 10.2.155.250	10.2.155.251
256	10.2.155.252/30	10.2.155.253 – 10.2.155.254	10.2.155.255

showing 256 of 512

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 →