The following is an IP mapping of domains in the COM, NET, ORG, INFO, BIZ, US space.
The number of domains that resolve to which network addresses.
Each network address coincides with an authority for that block, usually that authority resides in just one continent.
A Network Block also goes by the name Class-A network.
Blocks with fewer then 50 domains have been set to zero for simplicity.
Domain owners may map DNS of their domain to any IP, but the domain will not resolve if the IP is in a dead zone.
Class-A
Domains Hosted
Description
1
24,631
IANA - Reserved
2
0
IANA - Reserved
3
0
General Electric Company
4
16,763
Level3/Genuity-BBN (IANA INFO: Bolt Beranek and Newman Inc.)
5
0
IANA - Reserved
6
0
Army Information Systems Center
7
0
IANA - Reserved
8
26,057
Level3/Genuity-BBN (IANA INFO: Bolt Beranek and Newman Inc.)
9
0
IBM
10
1,978
IANA - Private Use. See RFC 1918
11
79
DoD Intel Information Systems
12
214,231
AT&T Bell Laboratories
13
177
Xerox Corporation
14
0
IANA - Public Data Network
15
147
Hewlett-Packard Company
16
0
Digital Equipment Corporation
17
180
Apple Computer Inc.
18
498
MIT
19
0
Ford Motor Company
20
69
Computer Sciences Corporation
21
0
DDN-RVN
22
0
Defense Information Systems Agency
23
0
IANA - Reserved
24
144,335
ARIN - Cable Block (Formerly IANA - Jul 95)
25
0
Royal Signals and Radar Establishment
26
0
Defense Information Systems Agency
27
0
IANA - Reserved
28
0
DSI-North
29
0
Defense Information Systems Agency
30
0
Defense Information Systems Agency
31
0
IANA - Reserved
32
280
AT&T (IANA INFO: Norsk Informasjonsteknologi)
33
0
DLA Systems Automation Center
34
0
Halliburton Company
35
374
MERIT Computer Network
36
0
IANA - Reserved (Formerly Stanford University - Apr 93 to
37
0
IANA - Reserved
38
184,649
COGENT/PSI (IANA INFO: Performance Systems International)
39
0
IANA - Reserved
40
285
Eli Lily and Company
41
0
AFRINIC
42
0
IANA - Reserved
43
1,549
V6NIC
44
0
Amateur Radio Digital Communications
45
0
Interop Show Network
46
0
Level3/Genuity-BBN (IANA INFO: Bolt Beranek and Newman Inc.)
47
53
Nortel (IANA INFO: Bell-Northern Research)
48
0
Prudential Securities Inc.
49
0
IANA (Formerly DoD - Joint Technical Command. Used: May 94
50
0
IANA (Formerly DoD - Joint Technical Command. Used: May 94
51
0
Deparment of Social Security of UK (EU territory should be
52
93
E.I. duPont de Nemours and Co., Inc.
53
69
Cap Debis CCS (EU territory should be in RIPE database)
54
0
Merck and Co., Inc.
55
0
Naval Ocean Systems Center (IANA INFO: Boeing Computer Services)
56
0
U.S. Postal Service
57
542
SITA (Equant.Net routable. EU territory should be in RIPE database)
58
14,259
APNIC
59
41,684
APNIC
60
24,364
APNIC
61
439,278
APNIC
62
860,328
RIPE
63
842,130
ARIN
64
10,248,765
ARIN
65
1,374,615
ARIN
66
6,030,266
ARIN
67
988,896
ARIN
68
1,134,834
ARIN
69
2,269,583
ARIN
70
620,392
ARIN
71
37,917
ARIN
72
764,684
ARIN
73
0
ARIN
74
0
ARIN
75
0
ARIN
76
0
ARIN
77
0
IANA - Reserved
78
0
IANA - Reserved
79
0
IANA - Reserved
80
1,006,610
RIPE
81
548,040
RIPE
82
1,253,887
RIPE
83
370,109
RIPE
84
248,976
RIPE
85
130,775
RIPE
86
19,068
RIPE
87
15,909
RIPE
88
693
RIPE
89
0
RIPE
90
0
RIPE
91
0
RIPE
92
0
IANA - Reserved
93
0
IANA - Reserved
94
0
IANA - Reserved
95
0
IANA - Reserved
96
0
IANA - Reserved
97
0
IANA - Reserved
98
0
IANA - Reserved
99
156
IANA - Reserved
100
0
IANA - Reserved
101
0
IANA - Reserved
102
0
IANA - Reserved
103
0
IANA - Reserved
104
0
IANA - Reserved
105
0
IANA - Reserved
106
0
IANA - Reserved
107
0
IANA - Reserved
108
0
IANA - Reserved
109
0
IANA - Reserved
110
0
IANA - Reserved
111
53
IANA - Reserved
112
0
IANA - Reserved
113
0
IANA - Reserved
114
0
IANA - Reserved
115
0
IANA - Reserved
116
0
IANA - Reserved
117
0
IANA - Reserved
118
0
IANA - Reserved
119
0
IANA - Reserved
120
0
IANA - Reserved
121
0
IANA - Reserved
122
60
IANA - Reserved
123
63
IANA - Reserved
124
0
APNIC
125
761
APNIC
126
0
APNIC
127
10,095
IANA - Reserved Loopback. See RFC 3330
128
81,753
Various Registries - Early Internic Registrations
129
19,801
Various Registries - Early Internic Registrations
130
32,459
Various Registries - Early Internic Registrations
131
5,982
Various Registries - Early Internic Registrations
132
1,852
Various Registries - Early Internic Registrations
133
690
JPNIC
134
5,889
Various Registries - Early Internic Registrations
135
786
Various Registries - Early Internic Registrations
136
7,109
Various Registries - Early Internic Registrations
137
3,599
Various Registries - Early Internic Registrations
138
2,003
Various Registries - Early Internic Registrations
139
26,376
Various Registries - Early Internic Registrations
140
24,882
Various Registries - Early Internic Registrations
141
9,900
Various Registries - Early Internic Registrations
142
12,182
Various Registries - Early Internic Registrations
143
3,789
Various Registries - Early Internic Registrations
144
5,085
Various Registries - Early Internic Registrations
145
7,124
RIPE
146
14,873
Various Registries - Early Internic Registrations
147
42,144
Various Registries - Early Internic Registrations
148
11,745
Various Registries - Early Internic Registrations
149
7,621
Various Registries - Early Internic Registrations
150
4,918
Various Registries - Early Internic Registrations
151
27,908
Various Registries - Early Internic Registrations
152
5,050
Various Registries - Early Internic Registrations
153
1,132
Various Registries - Early Internic Registrations
154
2,535
Various Registries - Early Internic Registrations
155
9,310
Various Registries - Early Internic Registrations
156
2,647
Various Registries - Early Internic Registrations
157
7,968
Various Registries - Early Internic Registrations
158
2,343
Various Registries - Early Internic Registrations
159
25,066
Various Registries - Early Internic Registrations
160
6,109
Various Registries - Early Internic Registrations
161
139,209
Various Registries - Early Internic Registrations
162
15,446
Various Registries - Early Internic Registrations
163
2,687
Various Registries - Early Internic Registrations
164
27,763
Various Registries - Early Internic Registrations
165
10,365
Various Registries - Early Internic Registrations
166
13,199
Various Registries - Early Internic Registrations
167
18,613
Various Registries - Early Internic Registrations
168
88,412
Various Registries - Early Internic Registrations
169
2,602
Various Registries - Early Internic Registrations
170
8,460
Various Registries - Early Internic Registrations
171
1,559
Various Registries - Early Internic Registrations
172
617
Various Registries - Early Internic Registrations
173
0
IANA - Reserved
174
0
IANA - Reserved
175
0
IANA - Reserved
176
0
IANA - Reserved
177
0
IANA - Reserved
178
0
IANA - Reserved
179
0
IANA - Reserved
180
0
IANA - Reserved
181
0
IANA - Reserved
182
0
IANA - Reserved
183
0
IANA - Reserved
184
0
IANA - Reserved
185
0
IANA - Reserved
186
0
IANA - Reserved
187
0
IANA - Reserved
188
0
RIPE
189
0
LACNIC
190
0
LACNIC
191
0
Reserved - ARIN whois shows only one allocation of 191.255.0.0/16
192
281,709
Various Registries MultiRegional - Early Registrations
