Data as of Nov 8, 2026
51.21.0.0/16
12 residential-proxy exits · 30 daysAmazon.com, Inc. · space held by A100 ROW Inc
Residential-proxy exits
Proxy exits
12
0.02% of its addresses · 30 days
Oct 9, 2026 – Nov 7, 2026
Exits seen per day
67 observations
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 51.20.0.0/14 since Dec 2024 | AS16509 | Hosting | A100 ROW Inc |
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 51. | 851,968 | US-A100ROW-19930901 | A100 ROW Inc (ORG-ARI3-RIPE) · US | ALLOCATED PA | Apr 20, 2026 | trustandsafety@ |
| └ 51.21.0.0/16 | 65,536 | EC2-ARN | unknown | ASSIGNED PA | Aug 7, 2023 | trustandsafety@ via US-A100ROW-19930901 |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
Registry
Holder
- Organization
- A100 ROW Inc
- Handle
- ORG-ARI3-RIPE
- Range
- 51.
20. 0. 0 - 51. 32. 255. 255 - Registration type
- ALLOCATED PA
- Record created
- Apr 20, 2026
Origin network
AS16509
US
- Name
- Amazon.com, Inc.
- Type
- Hosting
- Registered
- May 4, 2000
- Domain
- amazon.com
- Website
- www.amazon.com
- Industry
- Hosting and Cloud Provider
- Spamhaus ASN-DROP
- not listed
- VPN servers
- 294
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Aug 2023
- Current origin since
- Aug 2023 · 3.3 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 51.21.0.0/16 | AS16509 | /16 | RIPE | RPKI valid |
| 51.20.0.0/14 | AS16509 | /14 | RIPE | Too specific |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS16509 | RADB | Amazon EC2 ARN | MAINT-AS16509 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 51.
21. 0. 0/ 16 - Netname
- EC2-ARN
- Registrant country
- SE
- Organization
- Not stated by the registry
- Type
- ASSIGNED PA
- Created
- Aug 7, 2023
- Updated
- Apr 20, 2026
- Maintainer
- MNT-ADSI
- RIR
- RIPE NCC
- Country
- US
- Delegated
- Sep 1, 1993
- Status
- assigned
Report abuse
Abuse contact
- trustandsafety@
support. aws. com - Name
- Amazon Web Services Abuse
- Handle
- AWSA3-RIPE