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Data as of Nov 9, 2026

12.21.101.0/24

1 residential-proxy exit · 30 days

City of San Leandro · space held by AT&T Enterprises, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS11891
Type
Business
Risk
0 / 100 · Low

Residential-proxy exits

Proxy exits
1
0.39% of its addresses · 30 days
Providers
19
selling exits here
Oct 10, 2026 – Nov 8, 2026

Exits seen per day

186 observations

Proxy providers listing exits

  • AnyIP
  • BottingTools
  • ByteProxies
  • Byteful
  • ColaProxy
  • FlexyProxies
  • Geonode
  • GloryCloud
  • GonzoProxy
  • HydraProxy
  • IPFly
  • Infatica
  • InfiniteProxies
  • MangoProxy
  • NovaProxy
  • RoamProxy
  • Shifter
  • Thordata
  • VitalExclusive

Announcements

Less specific

Covering announcements

PrefixOriginTypeProxy exitsHolderRPKI
12.0.0.0/9AS7018Residential8,073
434 always on
AT&T Enterprises, LLC
12.0.0.0/8AS7018Residential13,384
731 always on
AT&T Enterprises, 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.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
12.0.0.0/816,777,216ATTAT&T Enterprises, LLC (AEL-360) · USDirect AllocationAug 23, 1983abuse@att.net
└ 12.21.101.0/24256ATT-NET-12-21-101-0City of San Leandro (CSL-533) · USReassignedAug 3, 2026—

Network & registry

AnnouncementRouting historyWhois & abuse
IPv4 market

Holder

Holder in the market →
Organization
AT&T Enterprises, LLC
Handle
AEL-360
Range
12.0.0.0/8
Registration type
Direct Allocation
Record created
Aug 23, 1983
Legacy
yes
Origin network

AS11891

US
Name
City of San Leandro
Type
Business
Registered
Apr 1, 2024
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed