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)10.167.88.0/21

network10.167.88.0/21

broadcast10.167.95.255

first host10.167.88.1

last host10.167.95.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.167.88.0/21

address00001010.10100111.01011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.10100111.01011000.00000000

broadcast00001010.10100111.01011111.11111111

green = network part, grey = host part

hex0x0aa75800

decimal178739200

reverse dns0.88.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:5800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.167.88.0/30	10.167.88.1 – 10.167.88.2	10.167.88.3
2	10.167.88.4/30	10.167.88.5 – 10.167.88.6	10.167.88.7
3	10.167.88.8/30	10.167.88.9 – 10.167.88.10	10.167.88.11
4	10.167.88.12/30	10.167.88.13 – 10.167.88.14	10.167.88.15
5	10.167.88.16/30	10.167.88.17 – 10.167.88.18	10.167.88.19
6	10.167.88.20/30	10.167.88.21 – 10.167.88.22	10.167.88.23
7	10.167.88.24/30	10.167.88.25 – 10.167.88.26	10.167.88.27
8	10.167.88.28/30	10.167.88.29 – 10.167.88.30	10.167.88.31
9	10.167.88.32/30	10.167.88.33 – 10.167.88.34	10.167.88.35
10	10.167.88.36/30	10.167.88.37 – 10.167.88.38	10.167.88.39
11	10.167.88.40/30	10.167.88.41 – 10.167.88.42	10.167.88.43
12	10.167.88.44/30	10.167.88.45 – 10.167.88.46	10.167.88.47
13	10.167.88.48/30	10.167.88.49 – 10.167.88.50	10.167.88.51
14	10.167.88.52/30	10.167.88.53 – 10.167.88.54	10.167.88.55
15	10.167.88.56/30	10.167.88.57 – 10.167.88.58	10.167.88.59
16	10.167.88.60/30	10.167.88.61 – 10.167.88.62	10.167.88.63
17	10.167.88.64/30	10.167.88.65 – 10.167.88.66	10.167.88.67
18	10.167.88.68/30	10.167.88.69 – 10.167.88.70	10.167.88.71
19	10.167.88.72/30	10.167.88.73 – 10.167.88.74	10.167.88.75
20	10.167.88.76/30	10.167.88.77 – 10.167.88.78	10.167.88.79
21	10.167.88.80/30	10.167.88.81 – 10.167.88.82	10.167.88.83
22	10.167.88.84/30	10.167.88.85 – 10.167.88.86	10.167.88.87
23	10.167.88.88/30	10.167.88.89 – 10.167.88.90	10.167.88.91
24	10.167.88.92/30	10.167.88.93 – 10.167.88.94	10.167.88.95
25	10.167.88.96/30	10.167.88.97 – 10.167.88.98	10.167.88.99
26	10.167.88.100/30	10.167.88.101 – 10.167.88.102	10.167.88.103
27	10.167.88.104/30	10.167.88.105 – 10.167.88.106	10.167.88.107
28	10.167.88.108/30	10.167.88.109 – 10.167.88.110	10.167.88.111
29	10.167.88.112/30	10.167.88.113 – 10.167.88.114	10.167.88.115
30	10.167.88.116/30	10.167.88.117 – 10.167.88.118	10.167.88.119
31	10.167.88.120/30	10.167.88.121 – 10.167.88.122	10.167.88.123
32	10.167.88.124/30	10.167.88.125 – 10.167.88.126	10.167.88.127
33	10.167.88.128/30	10.167.88.129 – 10.167.88.130	10.167.88.131
34	10.167.88.132/30	10.167.88.133 – 10.167.88.134	10.167.88.135
35	10.167.88.136/30	10.167.88.137 – 10.167.88.138	10.167.88.139
36	10.167.88.140/30	10.167.88.141 – 10.167.88.142	10.167.88.143
37	10.167.88.144/30	10.167.88.145 – 10.167.88.146	10.167.88.147
38	10.167.88.148/30	10.167.88.149 – 10.167.88.150	10.167.88.151
39	10.167.88.152/30	10.167.88.153 – 10.167.88.154	10.167.88.155
40	10.167.88.156/30	10.167.88.157 – 10.167.88.158	10.167.88.159
41	10.167.88.160/30	10.167.88.161 – 10.167.88.162	10.167.88.163
42	10.167.88.164/30	10.167.88.165 – 10.167.88.166	10.167.88.167
43	10.167.88.168/30	10.167.88.169 – 10.167.88.170	10.167.88.171
44	10.167.88.172/30	10.167.88.173 – 10.167.88.174	10.167.88.175
45	10.167.88.176/30	10.167.88.177 – 10.167.88.178	10.167.88.179
46	10.167.88.180/30	10.167.88.181 – 10.167.88.182	10.167.88.183
47	10.167.88.184/30	10.167.88.185 – 10.167.88.186	10.167.88.187
48	10.167.88.188/30	10.167.88.189 – 10.167.88.190	10.167.88.191
49	10.167.88.192/30	10.167.88.193 – 10.167.88.194	10.167.88.195
50	10.167.88.196/30	10.167.88.197 – 10.167.88.198	10.167.88.199
51	10.167.88.200/30	10.167.88.201 – 10.167.88.202	10.167.88.203
52	10.167.88.204/30	10.167.88.205 – 10.167.88.206	10.167.88.207
53	10.167.88.208/30	10.167.88.209 – 10.167.88.210	10.167.88.211
54	10.167.88.212/30	10.167.88.213 – 10.167.88.214	10.167.88.215
55	10.167.88.216/30	10.167.88.217 – 10.167.88.218	10.167.88.219
56	10.167.88.220/30	10.167.88.221 – 10.167.88.222	10.167.88.223
57	10.167.88.224/30	10.167.88.225 – 10.167.88.226	10.167.88.227
58	10.167.88.228/30	10.167.88.229 – 10.167.88.230	10.167.88.231
59	10.167.88.232/30	10.167.88.233 – 10.167.88.234	10.167.88.235
60	10.167.88.236/30	10.167.88.237 – 10.167.88.238	10.167.88.239
61	10.167.88.240/30	10.167.88.241 – 10.167.88.242	10.167.88.243
62	10.167.88.244/30	10.167.88.245 – 10.167.88.246	10.167.88.247
63	10.167.88.248/30	10.167.88.249 – 10.167.88.250	10.167.88.251
64	10.167.88.252/30	10.167.88.253 – 10.167.88.254	10.167.88.255
65	10.167.89.0/30	10.167.89.1 – 10.167.89.2	10.167.89.3
66	10.167.89.4/30	10.167.89.5 – 10.167.89.6	10.167.89.7
67	10.167.89.8/30	10.167.89.9 – 10.167.89.10	10.167.89.11
68	10.167.89.12/30	10.167.89.13 – 10.167.89.14	10.167.89.15
69	10.167.89.16/30	10.167.89.17 – 10.167.89.18	10.167.89.19
70	10.167.89.20/30	10.167.89.21 – 10.167.89.22	10.167.89.23
71	10.167.89.24/30	10.167.89.25 – 10.167.89.26	10.167.89.27
72	10.167.89.28/30	10.167.89.29 – 10.167.89.30	10.167.89.31
73	10.167.89.32/30	10.167.89.33 – 10.167.89.34	10.167.89.35
74	10.167.89.36/30	10.167.89.37 – 10.167.89.38	10.167.89.39
75	10.167.89.40/30	10.167.89.41 – 10.167.89.42	10.167.89.43
76	10.167.89.44/30	10.167.89.45 – 10.167.89.46	10.167.89.47
77	10.167.89.48/30	10.167.89.49 – 10.167.89.50	10.167.89.51
78	10.167.89.52/30	10.167.89.53 – 10.167.89.54	10.167.89.55
79	10.167.89.56/30	10.167.89.57 – 10.167.89.58	10.167.89.59
80	10.167.89.60/30	10.167.89.61 – 10.167.89.62	10.167.89.63
81	10.167.89.64/30	10.167.89.65 – 10.167.89.66	10.167.89.67
82	10.167.89.68/30	10.167.89.69 – 10.167.89.70	10.167.89.71
83	10.167.89.72/30	10.167.89.73 – 10.167.89.74	10.167.89.75
84	10.167.89.76/30	10.167.89.77 – 10.167.89.78	10.167.89.79
85	10.167.89.80/30	10.167.89.81 – 10.167.89.82	10.167.89.83
86	10.167.89.84/30	10.167.89.85 – 10.167.89.86	10.167.89.87
87	10.167.89.88/30	10.167.89.89 – 10.167.89.90	10.167.89.91
88	10.167.89.92/30	10.167.89.93 – 10.167.89.94	10.167.89.95
89	10.167.89.96/30	10.167.89.97 – 10.167.89.98	10.167.89.99
90	10.167.89.100/30	10.167.89.101 – 10.167.89.102	10.167.89.103
91	10.167.89.104/30	10.167.89.105 – 10.167.89.106	10.167.89.107
92	10.167.89.108/30	10.167.89.109 – 10.167.89.110	10.167.89.111
93	10.167.89.112/30	10.167.89.113 – 10.167.89.114	10.167.89.115
94	10.167.89.116/30	10.167.89.117 – 10.167.89.118	10.167.89.119
95	10.167.89.120/30	10.167.89.121 – 10.167.89.122	10.167.89.123
96	10.167.89.124/30	10.167.89.125 – 10.167.89.126	10.167.89.127
97	10.167.89.128/30	10.167.89.129 – 10.167.89.130	10.167.89.131
98	10.167.89.132/30	10.167.89.133 – 10.167.89.134	10.167.89.135
99	10.167.89.136/30	10.167.89.137 – 10.167.89.138	10.167.89.139
100	10.167.89.140/30	10.167.89.141 – 10.167.89.142	10.167.89.143
101	10.167.89.144/30	10.167.89.145 – 10.167.89.146	10.167.89.147
102	10.167.89.148/30	10.167.89.149 – 10.167.89.150	10.167.89.151
103	10.167.89.152/30	10.167.89.153 – 10.167.89.154	10.167.89.155
104	10.167.89.156/30	10.167.89.157 – 10.167.89.158	10.167.89.159
105	10.167.89.160/30	10.167.89.161 – 10.167.89.162	10.167.89.163
106	10.167.89.164/30	10.167.89.165 – 10.167.89.166	10.167.89.167
107	10.167.89.168/30	10.167.89.169 – 10.167.89.170	10.167.89.171
108	10.167.89.172/30	10.167.89.173 – 10.167.89.174	10.167.89.175
109	10.167.89.176/30	10.167.89.177 – 10.167.89.178	10.167.89.179
110	10.167.89.180/30	10.167.89.181 – 10.167.89.182	10.167.89.183
111	10.167.89.184/30	10.167.89.185 – 10.167.89.186	10.167.89.187
112	10.167.89.188/30	10.167.89.189 – 10.167.89.190	10.167.89.191
113	10.167.89.192/30	10.167.89.193 – 10.167.89.194	10.167.89.195
114	10.167.89.196/30	10.167.89.197 – 10.167.89.198	10.167.89.199
115	10.167.89.200/30	10.167.89.201 – 10.167.89.202	10.167.89.203
116	10.167.89.204/30	10.167.89.205 – 10.167.89.206	10.167.89.207
117	10.167.89.208/30	10.167.89.209 – 10.167.89.210	10.167.89.211
118	10.167.89.212/30	10.167.89.213 – 10.167.89.214	10.167.89.215
119	10.167.89.216/30	10.167.89.217 – 10.167.89.218	10.167.89.219
120	10.167.89.220/30	10.167.89.221 – 10.167.89.222	10.167.89.223
121	10.167.89.224/30	10.167.89.225 – 10.167.89.226	10.167.89.227
122	10.167.89.228/30	10.167.89.229 – 10.167.89.230	10.167.89.231
123	10.167.89.232/30	10.167.89.233 – 10.167.89.234	10.167.89.235
124	10.167.89.236/30	10.167.89.237 – 10.167.89.238	10.167.89.239
125	10.167.89.240/30	10.167.89.241 – 10.167.89.242	10.167.89.243
126	10.167.89.244/30	10.167.89.245 – 10.167.89.246	10.167.89.247
127	10.167.89.248/30	10.167.89.249 – 10.167.89.250	10.167.89.251
128	10.167.89.252/30	10.167.89.253 – 10.167.89.254	10.167.89.255
129	10.167.90.0/30	10.167.90.1 – 10.167.90.2	10.167.90.3
130	10.167.90.4/30	10.167.90.5 – 10.167.90.6	10.167.90.7
131	10.167.90.8/30	10.167.90.9 – 10.167.90.10	10.167.90.11
132	10.167.90.12/30	10.167.90.13 – 10.167.90.14	10.167.90.15
133	10.167.90.16/30	10.167.90.17 – 10.167.90.18	10.167.90.19
134	10.167.90.20/30	10.167.90.21 – 10.167.90.22	10.167.90.23
135	10.167.90.24/30	10.167.90.25 – 10.167.90.26	10.167.90.27
136	10.167.90.28/30	10.167.90.29 – 10.167.90.30	10.167.90.31
137	10.167.90.32/30	10.167.90.33 – 10.167.90.34	10.167.90.35
138	10.167.90.36/30	10.167.90.37 – 10.167.90.38	10.167.90.39
139	10.167.90.40/30	10.167.90.41 – 10.167.90.42	10.167.90.43
140	10.167.90.44/30	10.167.90.45 – 10.167.90.46	10.167.90.47
141	10.167.90.48/30	10.167.90.49 – 10.167.90.50	10.167.90.51
142	10.167.90.52/30	10.167.90.53 – 10.167.90.54	10.167.90.55
143	10.167.90.56/30	10.167.90.57 – 10.167.90.58	10.167.90.59
144	10.167.90.60/30	10.167.90.61 – 10.167.90.62	10.167.90.63
145	10.167.90.64/30	10.167.90.65 – 10.167.90.66	10.167.90.67
146	10.167.90.68/30	10.167.90.69 – 10.167.90.70	10.167.90.71
147	10.167.90.72/30	10.167.90.73 – 10.167.90.74	10.167.90.75
148	10.167.90.76/30	10.167.90.77 – 10.167.90.78	10.167.90.79
149	10.167.90.80/30	10.167.90.81 – 10.167.90.82	10.167.90.83
150	10.167.90.84/30	10.167.90.85 – 10.167.90.86	10.167.90.87
151	10.167.90.88/30	10.167.90.89 – 10.167.90.90	10.167.90.91
152	10.167.90.92/30	10.167.90.93 – 10.167.90.94	10.167.90.95
153	10.167.90.96/30	10.167.90.97 – 10.167.90.98	10.167.90.99
154	10.167.90.100/30	10.167.90.101 – 10.167.90.102	10.167.90.103
155	10.167.90.104/30	10.167.90.105 – 10.167.90.106	10.167.90.107
156	10.167.90.108/30	10.167.90.109 – 10.167.90.110	10.167.90.111
157	10.167.90.112/30	10.167.90.113 – 10.167.90.114	10.167.90.115
158	10.167.90.116/30	10.167.90.117 – 10.167.90.118	10.167.90.119
159	10.167.90.120/30	10.167.90.121 – 10.167.90.122	10.167.90.123
160	10.167.90.124/30	10.167.90.125 – 10.167.90.126	10.167.90.127
161	10.167.90.128/30	10.167.90.129 – 10.167.90.130	10.167.90.131
162	10.167.90.132/30	10.167.90.133 – 10.167.90.134	10.167.90.135
163	10.167.90.136/30	10.167.90.137 – 10.167.90.138	10.167.90.139
164	10.167.90.140/30	10.167.90.141 – 10.167.90.142	10.167.90.143
165	10.167.90.144/30	10.167.90.145 – 10.167.90.146	10.167.90.147
166	10.167.90.148/30	10.167.90.149 – 10.167.90.150	10.167.90.151
167	10.167.90.152/30	10.167.90.153 – 10.167.90.154	10.167.90.155
168	10.167.90.156/30	10.167.90.157 – 10.167.90.158	10.167.90.159
169	10.167.90.160/30	10.167.90.161 – 10.167.90.162	10.167.90.163
170	10.167.90.164/30	10.167.90.165 – 10.167.90.166	10.167.90.167
171	10.167.90.168/30	10.167.90.169 – 10.167.90.170	10.167.90.171
172	10.167.90.172/30	10.167.90.173 – 10.167.90.174	10.167.90.175
173	10.167.90.176/30	10.167.90.177 – 10.167.90.178	10.167.90.179
174	10.167.90.180/30	10.167.90.181 – 10.167.90.182	10.167.90.183
175	10.167.90.184/30	10.167.90.185 – 10.167.90.186	10.167.90.187
176	10.167.90.188/30	10.167.90.189 – 10.167.90.190	10.167.90.191
177	10.167.90.192/30	10.167.90.193 – 10.167.90.194	10.167.90.195
178	10.167.90.196/30	10.167.90.197 – 10.167.90.198	10.167.90.199
179	10.167.90.200/30	10.167.90.201 – 10.167.90.202	10.167.90.203
180	10.167.90.204/30	10.167.90.205 – 10.167.90.206	10.167.90.207
181	10.167.90.208/30	10.167.90.209 – 10.167.90.210	10.167.90.211
182	10.167.90.212/30	10.167.90.213 – 10.167.90.214	10.167.90.215
183	10.167.90.216/30	10.167.90.217 – 10.167.90.218	10.167.90.219
184	10.167.90.220/30	10.167.90.221 – 10.167.90.222	10.167.90.223
185	10.167.90.224/30	10.167.90.225 – 10.167.90.226	10.167.90.227
186	10.167.90.228/30	10.167.90.229 – 10.167.90.230	10.167.90.231
187	10.167.90.232/30	10.167.90.233 – 10.167.90.234	10.167.90.235
188	10.167.90.236/30	10.167.90.237 – 10.167.90.238	10.167.90.239
189	10.167.90.240/30	10.167.90.241 – 10.167.90.242	10.167.90.243
190	10.167.90.244/30	10.167.90.245 – 10.167.90.246	10.167.90.247
191	10.167.90.248/30	10.167.90.249 – 10.167.90.250	10.167.90.251
192	10.167.90.252/30	10.167.90.253 – 10.167.90.254	10.167.90.255
193	10.167.91.0/30	10.167.91.1 – 10.167.91.2	10.167.91.3
194	10.167.91.4/30	10.167.91.5 – 10.167.91.6	10.167.91.7
195	10.167.91.8/30	10.167.91.9 – 10.167.91.10	10.167.91.11
196	10.167.91.12/30	10.167.91.13 – 10.167.91.14	10.167.91.15
197	10.167.91.16/30	10.167.91.17 – 10.167.91.18	10.167.91.19
198	10.167.91.20/30	10.167.91.21 – 10.167.91.22	10.167.91.23
199	10.167.91.24/30	10.167.91.25 – 10.167.91.26	10.167.91.27
200	10.167.91.28/30	10.167.91.29 – 10.167.91.30	10.167.91.31
201	10.167.91.32/30	10.167.91.33 – 10.167.91.34	10.167.91.35
202	10.167.91.36/30	10.167.91.37 – 10.167.91.38	10.167.91.39
203	10.167.91.40/30	10.167.91.41 – 10.167.91.42	10.167.91.43
204	10.167.91.44/30	10.167.91.45 – 10.167.91.46	10.167.91.47
205	10.167.91.48/30	10.167.91.49 – 10.167.91.50	10.167.91.51
206	10.167.91.52/30	10.167.91.53 – 10.167.91.54	10.167.91.55
207	10.167.91.56/30	10.167.91.57 – 10.167.91.58	10.167.91.59
208	10.167.91.60/30	10.167.91.61 – 10.167.91.62	10.167.91.63
209	10.167.91.64/30	10.167.91.65 – 10.167.91.66	10.167.91.67
210	10.167.91.68/30	10.167.91.69 – 10.167.91.70	10.167.91.71
211	10.167.91.72/30	10.167.91.73 – 10.167.91.74	10.167.91.75
212	10.167.91.76/30	10.167.91.77 – 10.167.91.78	10.167.91.79
213	10.167.91.80/30	10.167.91.81 – 10.167.91.82	10.167.91.83
214	10.167.91.84/30	10.167.91.85 – 10.167.91.86	10.167.91.87
215	10.167.91.88/30	10.167.91.89 – 10.167.91.90	10.167.91.91
216	10.167.91.92/30	10.167.91.93 – 10.167.91.94	10.167.91.95
217	10.167.91.96/30	10.167.91.97 – 10.167.91.98	10.167.91.99
218	10.167.91.100/30	10.167.91.101 – 10.167.91.102	10.167.91.103
219	10.167.91.104/30	10.167.91.105 – 10.167.91.106	10.167.91.107
220	10.167.91.108/30	10.167.91.109 – 10.167.91.110	10.167.91.111
221	10.167.91.112/30	10.167.91.113 – 10.167.91.114	10.167.91.115
222	10.167.91.116/30	10.167.91.117 – 10.167.91.118	10.167.91.119
223	10.167.91.120/30	10.167.91.121 – 10.167.91.122	10.167.91.123
224	10.167.91.124/30	10.167.91.125 – 10.167.91.126	10.167.91.127
225	10.167.91.128/30	10.167.91.129 – 10.167.91.130	10.167.91.131
226	10.167.91.132/30	10.167.91.133 – 10.167.91.134	10.167.91.135
227	10.167.91.136/30	10.167.91.137 – 10.167.91.138	10.167.91.139
228	10.167.91.140/30	10.167.91.141 – 10.167.91.142	10.167.91.143
229	10.167.91.144/30	10.167.91.145 – 10.167.91.146	10.167.91.147
230	10.167.91.148/30	10.167.91.149 – 10.167.91.150	10.167.91.151
231	10.167.91.152/30	10.167.91.153 – 10.167.91.154	10.167.91.155
232	10.167.91.156/30	10.167.91.157 – 10.167.91.158	10.167.91.159
233	10.167.91.160/30	10.167.91.161 – 10.167.91.162	10.167.91.163
234	10.167.91.164/30	10.167.91.165 – 10.167.91.166	10.167.91.167
235	10.167.91.168/30	10.167.91.169 – 10.167.91.170	10.167.91.171
236	10.167.91.172/30	10.167.91.173 – 10.167.91.174	10.167.91.175
237	10.167.91.176/30	10.167.91.177 – 10.167.91.178	10.167.91.179
238	10.167.91.180/30	10.167.91.181 – 10.167.91.182	10.167.91.183
239	10.167.91.184/30	10.167.91.185 – 10.167.91.186	10.167.91.187
240	10.167.91.188/30	10.167.91.189 – 10.167.91.190	10.167.91.191
241	10.167.91.192/30	10.167.91.193 – 10.167.91.194	10.167.91.195
242	10.167.91.196/30	10.167.91.197 – 10.167.91.198	10.167.91.199
243	10.167.91.200/30	10.167.91.201 – 10.167.91.202	10.167.91.203
244	10.167.91.204/30	10.167.91.205 – 10.167.91.206	10.167.91.207
245	10.167.91.208/30	10.167.91.209 – 10.167.91.210	10.167.91.211
246	10.167.91.212/30	10.167.91.213 – 10.167.91.214	10.167.91.215
247	10.167.91.216/30	10.167.91.217 – 10.167.91.218	10.167.91.219
248	10.167.91.220/30	10.167.91.221 – 10.167.91.222	10.167.91.223
249	10.167.91.224/30	10.167.91.225 – 10.167.91.226	10.167.91.227
250	10.167.91.228/30	10.167.91.229 – 10.167.91.230	10.167.91.231
251	10.167.91.232/30	10.167.91.233 – 10.167.91.234	10.167.91.235
252	10.167.91.236/30	10.167.91.237 – 10.167.91.238	10.167.91.239
253	10.167.91.240/30	10.167.91.241 – 10.167.91.242	10.167.91.243
254	10.167.91.244/30	10.167.91.245 – 10.167.91.246	10.167.91.247
255	10.167.91.248/30	10.167.91.249 – 10.167.91.250	10.167.91.251
256	10.167.91.252/30	10.167.91.253 – 10.167.91.254	10.167.91.255

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 →