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)10.4.168.0/21

network10.4.168.0/21

broadcast10.4.175.255

first host10.4.168.1

last host10.4.175.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.4.168.0/21

address00001010.00000100.10101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000100.10101000.00000000

broadcast00001010.00000100.10101111.11111111

green = network part, grey = host part

hex0x0a04a800

decimal168077312

reverse dns0.168.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:a800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.4.168.0/30	10.4.168.1 – 10.4.168.2	10.4.168.3
2	10.4.168.4/30	10.4.168.5 – 10.4.168.6	10.4.168.7
3	10.4.168.8/30	10.4.168.9 – 10.4.168.10	10.4.168.11
4	10.4.168.12/30	10.4.168.13 – 10.4.168.14	10.4.168.15
5	10.4.168.16/30	10.4.168.17 – 10.4.168.18	10.4.168.19
6	10.4.168.20/30	10.4.168.21 – 10.4.168.22	10.4.168.23
7	10.4.168.24/30	10.4.168.25 – 10.4.168.26	10.4.168.27
8	10.4.168.28/30	10.4.168.29 – 10.4.168.30	10.4.168.31
9	10.4.168.32/30	10.4.168.33 – 10.4.168.34	10.4.168.35
10	10.4.168.36/30	10.4.168.37 – 10.4.168.38	10.4.168.39
11	10.4.168.40/30	10.4.168.41 – 10.4.168.42	10.4.168.43
12	10.4.168.44/30	10.4.168.45 – 10.4.168.46	10.4.168.47
13	10.4.168.48/30	10.4.168.49 – 10.4.168.50	10.4.168.51
14	10.4.168.52/30	10.4.168.53 – 10.4.168.54	10.4.168.55
15	10.4.168.56/30	10.4.168.57 – 10.4.168.58	10.4.168.59
16	10.4.168.60/30	10.4.168.61 – 10.4.168.62	10.4.168.63
17	10.4.168.64/30	10.4.168.65 – 10.4.168.66	10.4.168.67
18	10.4.168.68/30	10.4.168.69 – 10.4.168.70	10.4.168.71
19	10.4.168.72/30	10.4.168.73 – 10.4.168.74	10.4.168.75
20	10.4.168.76/30	10.4.168.77 – 10.4.168.78	10.4.168.79
21	10.4.168.80/30	10.4.168.81 – 10.4.168.82	10.4.168.83
22	10.4.168.84/30	10.4.168.85 – 10.4.168.86	10.4.168.87
23	10.4.168.88/30	10.4.168.89 – 10.4.168.90	10.4.168.91
24	10.4.168.92/30	10.4.168.93 – 10.4.168.94	10.4.168.95
25	10.4.168.96/30	10.4.168.97 – 10.4.168.98	10.4.168.99
26	10.4.168.100/30	10.4.168.101 – 10.4.168.102	10.4.168.103
27	10.4.168.104/30	10.4.168.105 – 10.4.168.106	10.4.168.107
28	10.4.168.108/30	10.4.168.109 – 10.4.168.110	10.4.168.111
29	10.4.168.112/30	10.4.168.113 – 10.4.168.114	10.4.168.115
30	10.4.168.116/30	10.4.168.117 – 10.4.168.118	10.4.168.119
31	10.4.168.120/30	10.4.168.121 – 10.4.168.122	10.4.168.123
32	10.4.168.124/30	10.4.168.125 – 10.4.168.126	10.4.168.127
33	10.4.168.128/30	10.4.168.129 – 10.4.168.130	10.4.168.131
34	10.4.168.132/30	10.4.168.133 – 10.4.168.134	10.4.168.135
35	10.4.168.136/30	10.4.168.137 – 10.4.168.138	10.4.168.139
36	10.4.168.140/30	10.4.168.141 – 10.4.168.142	10.4.168.143
37	10.4.168.144/30	10.4.168.145 – 10.4.168.146	10.4.168.147
38	10.4.168.148/30	10.4.168.149 – 10.4.168.150	10.4.168.151
39	10.4.168.152/30	10.4.168.153 – 10.4.168.154	10.4.168.155
40	10.4.168.156/30	10.4.168.157 – 10.4.168.158	10.4.168.159
41	10.4.168.160/30	10.4.168.161 – 10.4.168.162	10.4.168.163
42	10.4.168.164/30	10.4.168.165 – 10.4.168.166	10.4.168.167
43	10.4.168.168/30	10.4.168.169 – 10.4.168.170	10.4.168.171
44	10.4.168.172/30	10.4.168.173 – 10.4.168.174	10.4.168.175
45	10.4.168.176/30	10.4.168.177 – 10.4.168.178	10.4.168.179
46	10.4.168.180/30	10.4.168.181 – 10.4.168.182	10.4.168.183
47	10.4.168.184/30	10.4.168.185 – 10.4.168.186	10.4.168.187
48	10.4.168.188/30	10.4.168.189 – 10.4.168.190	10.4.168.191
49	10.4.168.192/30	10.4.168.193 – 10.4.168.194	10.4.168.195
50	10.4.168.196/30	10.4.168.197 – 10.4.168.198	10.4.168.199
51	10.4.168.200/30	10.4.168.201 – 10.4.168.202	10.4.168.203
52	10.4.168.204/30	10.4.168.205 – 10.4.168.206	10.4.168.207
53	10.4.168.208/30	10.4.168.209 – 10.4.168.210	10.4.168.211
54	10.4.168.212/30	10.4.168.213 – 10.4.168.214	10.4.168.215
55	10.4.168.216/30	10.4.168.217 – 10.4.168.218	10.4.168.219
56	10.4.168.220/30	10.4.168.221 – 10.4.168.222	10.4.168.223
57	10.4.168.224/30	10.4.168.225 – 10.4.168.226	10.4.168.227
58	10.4.168.228/30	10.4.168.229 – 10.4.168.230	10.4.168.231
59	10.4.168.232/30	10.4.168.233 – 10.4.168.234	10.4.168.235
60	10.4.168.236/30	10.4.168.237 – 10.4.168.238	10.4.168.239
61	10.4.168.240/30	10.4.168.241 – 10.4.168.242	10.4.168.243
62	10.4.168.244/30	10.4.168.245 – 10.4.168.246	10.4.168.247
63	10.4.168.248/30	10.4.168.249 – 10.4.168.250	10.4.168.251
64	10.4.168.252/30	10.4.168.253 – 10.4.168.254	10.4.168.255
65	10.4.169.0/30	10.4.169.1 – 10.4.169.2	10.4.169.3
66	10.4.169.4/30	10.4.169.5 – 10.4.169.6	10.4.169.7
67	10.4.169.8/30	10.4.169.9 – 10.4.169.10	10.4.169.11
68	10.4.169.12/30	10.4.169.13 – 10.4.169.14	10.4.169.15
69	10.4.169.16/30	10.4.169.17 – 10.4.169.18	10.4.169.19
70	10.4.169.20/30	10.4.169.21 – 10.4.169.22	10.4.169.23
71	10.4.169.24/30	10.4.169.25 – 10.4.169.26	10.4.169.27
72	10.4.169.28/30	10.4.169.29 – 10.4.169.30	10.4.169.31
73	10.4.169.32/30	10.4.169.33 – 10.4.169.34	10.4.169.35
74	10.4.169.36/30	10.4.169.37 – 10.4.169.38	10.4.169.39
75	10.4.169.40/30	10.4.169.41 – 10.4.169.42	10.4.169.43
76	10.4.169.44/30	10.4.169.45 – 10.4.169.46	10.4.169.47
77	10.4.169.48/30	10.4.169.49 – 10.4.169.50	10.4.169.51
78	10.4.169.52/30	10.4.169.53 – 10.4.169.54	10.4.169.55
79	10.4.169.56/30	10.4.169.57 – 10.4.169.58	10.4.169.59
80	10.4.169.60/30	10.4.169.61 – 10.4.169.62	10.4.169.63
81	10.4.169.64/30	10.4.169.65 – 10.4.169.66	10.4.169.67
82	10.4.169.68/30	10.4.169.69 – 10.4.169.70	10.4.169.71
83	10.4.169.72/30	10.4.169.73 – 10.4.169.74	10.4.169.75
84	10.4.169.76/30	10.4.169.77 – 10.4.169.78	10.4.169.79
85	10.4.169.80/30	10.4.169.81 – 10.4.169.82	10.4.169.83
86	10.4.169.84/30	10.4.169.85 – 10.4.169.86	10.4.169.87
87	10.4.169.88/30	10.4.169.89 – 10.4.169.90	10.4.169.91
88	10.4.169.92/30	10.4.169.93 – 10.4.169.94	10.4.169.95
89	10.4.169.96/30	10.4.169.97 – 10.4.169.98	10.4.169.99
90	10.4.169.100/30	10.4.169.101 – 10.4.169.102	10.4.169.103
91	10.4.169.104/30	10.4.169.105 – 10.4.169.106	10.4.169.107
92	10.4.169.108/30	10.4.169.109 – 10.4.169.110	10.4.169.111
93	10.4.169.112/30	10.4.169.113 – 10.4.169.114	10.4.169.115
94	10.4.169.116/30	10.4.169.117 – 10.4.169.118	10.4.169.119
95	10.4.169.120/30	10.4.169.121 – 10.4.169.122	10.4.169.123
96	10.4.169.124/30	10.4.169.125 – 10.4.169.126	10.4.169.127
97	10.4.169.128/30	10.4.169.129 – 10.4.169.130	10.4.169.131
98	10.4.169.132/30	10.4.169.133 – 10.4.169.134	10.4.169.135
99	10.4.169.136/30	10.4.169.137 – 10.4.169.138	10.4.169.139
100	10.4.169.140/30	10.4.169.141 – 10.4.169.142	10.4.169.143
101	10.4.169.144/30	10.4.169.145 – 10.4.169.146	10.4.169.147
102	10.4.169.148/30	10.4.169.149 – 10.4.169.150	10.4.169.151
103	10.4.169.152/30	10.4.169.153 – 10.4.169.154	10.4.169.155
104	10.4.169.156/30	10.4.169.157 – 10.4.169.158	10.4.169.159
105	10.4.169.160/30	10.4.169.161 – 10.4.169.162	10.4.169.163
106	10.4.169.164/30	10.4.169.165 – 10.4.169.166	10.4.169.167
107	10.4.169.168/30	10.4.169.169 – 10.4.169.170	10.4.169.171
108	10.4.169.172/30	10.4.169.173 – 10.4.169.174	10.4.169.175
109	10.4.169.176/30	10.4.169.177 – 10.4.169.178	10.4.169.179
110	10.4.169.180/30	10.4.169.181 – 10.4.169.182	10.4.169.183
111	10.4.169.184/30	10.4.169.185 – 10.4.169.186	10.4.169.187
112	10.4.169.188/30	10.4.169.189 – 10.4.169.190	10.4.169.191
113	10.4.169.192/30	10.4.169.193 – 10.4.169.194	10.4.169.195
114	10.4.169.196/30	10.4.169.197 – 10.4.169.198	10.4.169.199
115	10.4.169.200/30	10.4.169.201 – 10.4.169.202	10.4.169.203
116	10.4.169.204/30	10.4.169.205 – 10.4.169.206	10.4.169.207
117	10.4.169.208/30	10.4.169.209 – 10.4.169.210	10.4.169.211
118	10.4.169.212/30	10.4.169.213 – 10.4.169.214	10.4.169.215
119	10.4.169.216/30	10.4.169.217 – 10.4.169.218	10.4.169.219
120	10.4.169.220/30	10.4.169.221 – 10.4.169.222	10.4.169.223
121	10.4.169.224/30	10.4.169.225 – 10.4.169.226	10.4.169.227
122	10.4.169.228/30	10.4.169.229 – 10.4.169.230	10.4.169.231
123	10.4.169.232/30	10.4.169.233 – 10.4.169.234	10.4.169.235
124	10.4.169.236/30	10.4.169.237 – 10.4.169.238	10.4.169.239
125	10.4.169.240/30	10.4.169.241 – 10.4.169.242	10.4.169.243
126	10.4.169.244/30	10.4.169.245 – 10.4.169.246	10.4.169.247
127	10.4.169.248/30	10.4.169.249 – 10.4.169.250	10.4.169.251
128	10.4.169.252/30	10.4.169.253 – 10.4.169.254	10.4.169.255
129	10.4.170.0/30	10.4.170.1 – 10.4.170.2	10.4.170.3
130	10.4.170.4/30	10.4.170.5 – 10.4.170.6	10.4.170.7
131	10.4.170.8/30	10.4.170.9 – 10.4.170.10	10.4.170.11
132	10.4.170.12/30	10.4.170.13 – 10.4.170.14	10.4.170.15
133	10.4.170.16/30	10.4.170.17 – 10.4.170.18	10.4.170.19
134	10.4.170.20/30	10.4.170.21 – 10.4.170.22	10.4.170.23
135	10.4.170.24/30	10.4.170.25 – 10.4.170.26	10.4.170.27
136	10.4.170.28/30	10.4.170.29 – 10.4.170.30	10.4.170.31
137	10.4.170.32/30	10.4.170.33 – 10.4.170.34	10.4.170.35
138	10.4.170.36/30	10.4.170.37 – 10.4.170.38	10.4.170.39
139	10.4.170.40/30	10.4.170.41 – 10.4.170.42	10.4.170.43
140	10.4.170.44/30	10.4.170.45 – 10.4.170.46	10.4.170.47
141	10.4.170.48/30	10.4.170.49 – 10.4.170.50	10.4.170.51
142	10.4.170.52/30	10.4.170.53 – 10.4.170.54	10.4.170.55
143	10.4.170.56/30	10.4.170.57 – 10.4.170.58	10.4.170.59
144	10.4.170.60/30	10.4.170.61 – 10.4.170.62	10.4.170.63
145	10.4.170.64/30	10.4.170.65 – 10.4.170.66	10.4.170.67
146	10.4.170.68/30	10.4.170.69 – 10.4.170.70	10.4.170.71
147	10.4.170.72/30	10.4.170.73 – 10.4.170.74	10.4.170.75
148	10.4.170.76/30	10.4.170.77 – 10.4.170.78	10.4.170.79
149	10.4.170.80/30	10.4.170.81 – 10.4.170.82	10.4.170.83
150	10.4.170.84/30	10.4.170.85 – 10.4.170.86	10.4.170.87
151	10.4.170.88/30	10.4.170.89 – 10.4.170.90	10.4.170.91
152	10.4.170.92/30	10.4.170.93 – 10.4.170.94	10.4.170.95
153	10.4.170.96/30	10.4.170.97 – 10.4.170.98	10.4.170.99
154	10.4.170.100/30	10.4.170.101 – 10.4.170.102	10.4.170.103
155	10.4.170.104/30	10.4.170.105 – 10.4.170.106	10.4.170.107
156	10.4.170.108/30	10.4.170.109 – 10.4.170.110	10.4.170.111
157	10.4.170.112/30	10.4.170.113 – 10.4.170.114	10.4.170.115
158	10.4.170.116/30	10.4.170.117 – 10.4.170.118	10.4.170.119
159	10.4.170.120/30	10.4.170.121 – 10.4.170.122	10.4.170.123
160	10.4.170.124/30	10.4.170.125 – 10.4.170.126	10.4.170.127
161	10.4.170.128/30	10.4.170.129 – 10.4.170.130	10.4.170.131
162	10.4.170.132/30	10.4.170.133 – 10.4.170.134	10.4.170.135
163	10.4.170.136/30	10.4.170.137 – 10.4.170.138	10.4.170.139
164	10.4.170.140/30	10.4.170.141 – 10.4.170.142	10.4.170.143
165	10.4.170.144/30	10.4.170.145 – 10.4.170.146	10.4.170.147
166	10.4.170.148/30	10.4.170.149 – 10.4.170.150	10.4.170.151
167	10.4.170.152/30	10.4.170.153 – 10.4.170.154	10.4.170.155
168	10.4.170.156/30	10.4.170.157 – 10.4.170.158	10.4.170.159
169	10.4.170.160/30	10.4.170.161 – 10.4.170.162	10.4.170.163
170	10.4.170.164/30	10.4.170.165 – 10.4.170.166	10.4.170.167
171	10.4.170.168/30	10.4.170.169 – 10.4.170.170	10.4.170.171
172	10.4.170.172/30	10.4.170.173 – 10.4.170.174	10.4.170.175
173	10.4.170.176/30	10.4.170.177 – 10.4.170.178	10.4.170.179
174	10.4.170.180/30	10.4.170.181 – 10.4.170.182	10.4.170.183
175	10.4.170.184/30	10.4.170.185 – 10.4.170.186	10.4.170.187
176	10.4.170.188/30	10.4.170.189 – 10.4.170.190	10.4.170.191
177	10.4.170.192/30	10.4.170.193 – 10.4.170.194	10.4.170.195
178	10.4.170.196/30	10.4.170.197 – 10.4.170.198	10.4.170.199
179	10.4.170.200/30	10.4.170.201 – 10.4.170.202	10.4.170.203
180	10.4.170.204/30	10.4.170.205 – 10.4.170.206	10.4.170.207
181	10.4.170.208/30	10.4.170.209 – 10.4.170.210	10.4.170.211
182	10.4.170.212/30	10.4.170.213 – 10.4.170.214	10.4.170.215
183	10.4.170.216/30	10.4.170.217 – 10.4.170.218	10.4.170.219
184	10.4.170.220/30	10.4.170.221 – 10.4.170.222	10.4.170.223
185	10.4.170.224/30	10.4.170.225 – 10.4.170.226	10.4.170.227
186	10.4.170.228/30	10.4.170.229 – 10.4.170.230	10.4.170.231
187	10.4.170.232/30	10.4.170.233 – 10.4.170.234	10.4.170.235
188	10.4.170.236/30	10.4.170.237 – 10.4.170.238	10.4.170.239
189	10.4.170.240/30	10.4.170.241 – 10.4.170.242	10.4.170.243
190	10.4.170.244/30	10.4.170.245 – 10.4.170.246	10.4.170.247
191	10.4.170.248/30	10.4.170.249 – 10.4.170.250	10.4.170.251
192	10.4.170.252/30	10.4.170.253 – 10.4.170.254	10.4.170.255
193	10.4.171.0/30	10.4.171.1 – 10.4.171.2	10.4.171.3
194	10.4.171.4/30	10.4.171.5 – 10.4.171.6	10.4.171.7
195	10.4.171.8/30	10.4.171.9 – 10.4.171.10	10.4.171.11
196	10.4.171.12/30	10.4.171.13 – 10.4.171.14	10.4.171.15
197	10.4.171.16/30	10.4.171.17 – 10.4.171.18	10.4.171.19
198	10.4.171.20/30	10.4.171.21 – 10.4.171.22	10.4.171.23
199	10.4.171.24/30	10.4.171.25 – 10.4.171.26	10.4.171.27
200	10.4.171.28/30	10.4.171.29 – 10.4.171.30	10.4.171.31
201	10.4.171.32/30	10.4.171.33 – 10.4.171.34	10.4.171.35
202	10.4.171.36/30	10.4.171.37 – 10.4.171.38	10.4.171.39
203	10.4.171.40/30	10.4.171.41 – 10.4.171.42	10.4.171.43
204	10.4.171.44/30	10.4.171.45 – 10.4.171.46	10.4.171.47
205	10.4.171.48/30	10.4.171.49 – 10.4.171.50	10.4.171.51
206	10.4.171.52/30	10.4.171.53 – 10.4.171.54	10.4.171.55
207	10.4.171.56/30	10.4.171.57 – 10.4.171.58	10.4.171.59
208	10.4.171.60/30	10.4.171.61 – 10.4.171.62	10.4.171.63
209	10.4.171.64/30	10.4.171.65 – 10.4.171.66	10.4.171.67
210	10.4.171.68/30	10.4.171.69 – 10.4.171.70	10.4.171.71
211	10.4.171.72/30	10.4.171.73 – 10.4.171.74	10.4.171.75
212	10.4.171.76/30	10.4.171.77 – 10.4.171.78	10.4.171.79
213	10.4.171.80/30	10.4.171.81 – 10.4.171.82	10.4.171.83
214	10.4.171.84/30	10.4.171.85 – 10.4.171.86	10.4.171.87
215	10.4.171.88/30	10.4.171.89 – 10.4.171.90	10.4.171.91
216	10.4.171.92/30	10.4.171.93 – 10.4.171.94	10.4.171.95
217	10.4.171.96/30	10.4.171.97 – 10.4.171.98	10.4.171.99
218	10.4.171.100/30	10.4.171.101 – 10.4.171.102	10.4.171.103
219	10.4.171.104/30	10.4.171.105 – 10.4.171.106	10.4.171.107
220	10.4.171.108/30	10.4.171.109 – 10.4.171.110	10.4.171.111
221	10.4.171.112/30	10.4.171.113 – 10.4.171.114	10.4.171.115
222	10.4.171.116/30	10.4.171.117 – 10.4.171.118	10.4.171.119
223	10.4.171.120/30	10.4.171.121 – 10.4.171.122	10.4.171.123
224	10.4.171.124/30	10.4.171.125 – 10.4.171.126	10.4.171.127
225	10.4.171.128/30	10.4.171.129 – 10.4.171.130	10.4.171.131
226	10.4.171.132/30	10.4.171.133 – 10.4.171.134	10.4.171.135
227	10.4.171.136/30	10.4.171.137 – 10.4.171.138	10.4.171.139
228	10.4.171.140/30	10.4.171.141 – 10.4.171.142	10.4.171.143
229	10.4.171.144/30	10.4.171.145 – 10.4.171.146	10.4.171.147
230	10.4.171.148/30	10.4.171.149 – 10.4.171.150	10.4.171.151
231	10.4.171.152/30	10.4.171.153 – 10.4.171.154	10.4.171.155
232	10.4.171.156/30	10.4.171.157 – 10.4.171.158	10.4.171.159
233	10.4.171.160/30	10.4.171.161 – 10.4.171.162	10.4.171.163
234	10.4.171.164/30	10.4.171.165 – 10.4.171.166	10.4.171.167
235	10.4.171.168/30	10.4.171.169 – 10.4.171.170	10.4.171.171
236	10.4.171.172/30	10.4.171.173 – 10.4.171.174	10.4.171.175
237	10.4.171.176/30	10.4.171.177 – 10.4.171.178	10.4.171.179
238	10.4.171.180/30	10.4.171.181 – 10.4.171.182	10.4.171.183
239	10.4.171.184/30	10.4.171.185 – 10.4.171.186	10.4.171.187
240	10.4.171.188/30	10.4.171.189 – 10.4.171.190	10.4.171.191
241	10.4.171.192/30	10.4.171.193 – 10.4.171.194	10.4.171.195
242	10.4.171.196/30	10.4.171.197 – 10.4.171.198	10.4.171.199
243	10.4.171.200/30	10.4.171.201 – 10.4.171.202	10.4.171.203
244	10.4.171.204/30	10.4.171.205 – 10.4.171.206	10.4.171.207
245	10.4.171.208/30	10.4.171.209 – 10.4.171.210	10.4.171.211
246	10.4.171.212/30	10.4.171.213 – 10.4.171.214	10.4.171.215
247	10.4.171.216/30	10.4.171.217 – 10.4.171.218	10.4.171.219
248	10.4.171.220/30	10.4.171.221 – 10.4.171.222	10.4.171.223
249	10.4.171.224/30	10.4.171.225 – 10.4.171.226	10.4.171.227
250	10.4.171.228/30	10.4.171.229 – 10.4.171.230	10.4.171.231
251	10.4.171.232/30	10.4.171.233 – 10.4.171.234	10.4.171.235
252	10.4.171.236/30	10.4.171.237 – 10.4.171.238	10.4.171.239
253	10.4.171.240/30	10.4.171.241 – 10.4.171.242	10.4.171.243
254	10.4.171.244/30	10.4.171.245 – 10.4.171.246	10.4.171.247
255	10.4.171.248/30	10.4.171.249 – 10.4.171.250	10.4.171.251
256	10.4.171.252/30	10.4.171.253 – 10.4.171.254	10.4.171.255

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 →