Data as of Nov 13, 2026
209.87.72.0/21
Anonymizer · ISP proxyGTT Communications Inc. · space held by GTT Americas, LLC
Announcement
this exact prefix
RPKI valid
Announced by
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Aug 2026
from AS3257 GTT Communications Inc.
registry: reallocated to RCN by GTT Americas, LLC, Sep 25, 2026
IPv4 market
Path
Reallocated to RCN · Sep 25, 2026 · 7 wk ago · by GTT Americas, LLC
2 · Leased from
4 · Use
ISP proxy
anonymizer space, operator not named
Lineage
How this block came to its use, oldest first. The whole IPv4 market →
209.87.72.0/21
From the registry to its use
- Apr 6, 1999Registry recordGTT Americas, LLCDirect Allocation209.87.64.0/19
- May 9, 2005– Nov 9, 2007
- Nov 15, 2007– Jan 29, 2024
- Jan 18, 2024– today
- Apr 25, 2026– May 30, 2026
- Jul 31, 2026Route objectAS3257 GTT Communications Inc.ARIN route object for AS3257 GTT Communications Inc., maintainer MNT-GAL-104
- Aug 23, 2026– today
- Sep 25, 2026ReallocatedRCNReallocated209.87.72.0/21
- Sep 25, 2026
- todayLeased fromIPNetZoneIP broker
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 209.87.64.0/19 since Jan 2024 | AS3257 | Internet provider | 6 | GTT Americas, LLC |
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 |
|---|---|---|---|---|---|---|
| 209.87.64.0/19 | 8,192 | MEGAPATH-BLK-31 | GTT Americas, LLC (GAL-104) · US | Direct Allocation | Apr 6, 1999 | abuse@ |
| └ 209.87.72.0/21 | 2,048 | GTT-CUSTOMER | IPNetZone (IPNET-1) · US | Reallocated | Jul 31, 2026 | ipabuse@ |
| └ 209.87.72.0/21 | 2,048 | RCN-GTT | RCN (RTSL-6) · US | Reallocated | Sep 25, 2026 | abuse@ |
Network & registry
IPv4 market
Holder
- Organization
- GTT Americas, LLC
- Handle
- GAL-104
- Range
- 209.
87. 64. 0/ 19 - Registration type
- Direct Allocation
- Record created
- Apr 6, 1999
- Reallocated to
- RCN (RTSL-6)
- Reallocated range
- 209.
87. 72. 0/ 21 - Reallocated
- Sep 25, 2026
Origin network
AS3257
US
- Name
- GTT Communications Inc.
- Type
- Internet provider
- Registered
- Sep 30, 1994
- Domain
- gtt.net
- Website
- www.gtt.net
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
- VPN servers
- 243
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Apr 2026
- Current origin since
- Aug 2026 · 3 mo
- Origin networks
- 1
RPKI
Route origin authorizations
Whois
Registration for this announcement
- Range
- 209.
87. 72. 0/ 21 - Netname
- RCN-GTT
- Registrant
- RCN
- Organization
- RCN (RTSL-6)
- Org address
- 650 College Road East, Princeton, NJ, 08540
- Org country
- US
- Type
- Reallocated
- Handle
- NET-209-87-72-0-2
- Parent
- NET-209-87-72-0-1
- Created
- Sep 25, 2026
- RIR
- ARIN
- Country
- US
- Delegated
- Apr 6, 1999
- Status
- assigned
Report abuse
Abuse contact
- abuse@
rcn. com - Name
- RCN Abuse Department
- Phone
- +1-888-972-6622
- Handle
- RAD75-ARIN