Data as of Nov 14, 2026

209.28.0.0/16

No anonymizer space · no proxy exits in 30 days

British Telecommunications Limited · space held by INFONET Services Corporation

Announcement

this exact prefix

RPKI valid

Announced by

AS3300

Type

Residential

91% of it

Announcements

More specific

Announcements inside

Prefix	Origin	Type	Holder	RPKI
209.28.174.0/24 since Aug 2006	AS3300	Residential	INFONET Services Corporation

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
209.28.0.0/16	65,536	BT-CNF-1	INFONET Services Corporation (INFO) · US	Direct Allocation	Jan 28, 1997	matthias.blum@bt.com
└ 209.28.171.0/24	256	FAGIBB16	unknown	—	—	—
└ 209.28.172.16/29	8	ENERGIZER-200	unknown	—	—	—
└ 209.28.172.48/28	16	DRAGOCOGERBERDI-200	unknown	—	—	—
└ 209.28.172.192/26	64	ONDEONALCO-201	unknown	—	—	—
└ 209.28.173.0/24	256	PHARMACIA52	unknown	—	—	—
└ 209.28.174.0/24	256	INTERNALFW-200	Internal-FW (C00919591) · US	Reassigned	Sep 29, 2004	matthias.blum@bt.com via BT-CNF-1
└ 209.28.175.0/24	256	BENTLEYSYSTEMS3	unknown	—	—	—
└ 209.28.176.0/24	256	BENTLEYSYSTEMS4	unknown	—	—	—
└ 209.28.177.0/24	256	FINEMBLUXEMBOURG1	unknown	—	—	—
└ 209.28.178.0/24	256	FINEMBROME1	unknown	—	—	—
└ 209.28.179.0/24	256	APPLIEDMATERIALS4	unknown	—	—	—
└ 209.28.180.0/24	256	APPLIEDMATERIALS6	unknown	—	—	—
└ 209.28.181.0/24	256	NATINVEST2	unknown	—	—	—
└ 209.28.182.0/24	256	MODO19	unknown	—	—	—
└ 209.28.183.0/24	256	PHARMACIA53	unknown	—	—	—
└ 209.28.184.0/25	128	BAANLIS1	unknown	—	—	—
└ 209.28.185.16/28	16	FIDELIDADE	unknown	—	—	—
└ 209.28.186.0/24	256	PHARMACIA54	unknown	—	—	—
└ 209.28.187.0/24	256	PHARMACIA55	unknown	—	—	—
└ 209.28.188.0/24	256	PHARMACIA56	unknown	—	—	—
└ 209.28.189.0/24	256	PHARMACIA57	unknown	—	—	—
└ 209.28.190.0/27	32	MODO262	unknown	—	—	—
└ 209.28.190.32/27	32	PHARMACIA78	unknown	—	—	—
└ 209.28.190.64/28	16	EGETAEPPER-MORSONG1	unknown	—	—	—
└ 209.28.190.80/28	16	EGETAEPPER-GUTHEN1	unknown	—	—	—
└ 209.28.191.64/27	32	FINEMB-WARSAW1	unknown	—	—	—
└ 209.28.191.128/28	16	INFOSWITZ2	unknown	—	—	—
└ 209.28.191.192/26	64	GE-FANUC12	unknown	—	—	—
└ 209.28.192.0/24	256	SPILLERS13	unknown	—	—	—
└ 209.28.193.0/24	256	FAGIBB13	unknown	—	—	—
└ 209.28.194.0/24	256	DYNO10	unknown	—	—	—
└ 209.28.195.0/26	64	TELEGROUP8	unknown	—	—	—
└ 209.28.196.0/24	256	SSAB3	unknown	—	—	—
└ 209.28.197.0/24	256	SSAB6	unknown	—	—	—
└ 209.28.198.0/24	256	SSAB4	unknown	—	—	—
└ 209.28.199.0/24	256	SSAB5	unknown	—	—	—
└ 209.28.200.0/24	256	PANALPINA8	unknown	—	—	—
└ 209.28.201.0/24	256	OUTOKUMPU2	unknown	—	—	—
└ 209.28.202.0/24	256	MODO20	unknown	—	—	—
└ 209.28.203.0/24	256	KNUERR1	unknown	—	—	—
└ 209.28.204.0/26	64	EDA2	unknown	—	—	—
└ 209.28.204.64/27	32	CCNCSI5	unknown	—	—	—
└ 209.28.204.128/26	64	PHARMACIA69	unknown	—	—	—
└ 209.28.205.0/24	256	PHARMACIA60	unknown	—	—	—
└ 209.28.206.0/24	256	MODO21	unknown	—	—	—
└ 209.28.207.0/24	256	MODO22	unknown	—	—	—
└ 209.28.208.0/24	256	VAISALAOY4	unknown	—	—	—
└ 209.28.209.0/24	256	PHARMACIA61	unknown	—	—	—
└ 209.28.210.0/24	256	WARTSILA9	unknown	—	—	—
└ 209.28.211.0/24	256	PHARMACIA62	unknown	—	—	—
└ 209.28.212.0/24	256	PHARMACIA63	unknown	—	—	—
└ 209.28.213.0/24	256	MICROSOFT55	unknown	—	—	—
└ 209.28.214.0/24	256	MASSIVE2	unknown	—	—	—
└ 209.28.215.0/24	256	MASSIVE3	unknown	—	—	—
└ 209.28.216.0/24	256	CITRUS1	unknown	—	—	—
└ 209.28.217.0/24	256	TECNOMATIX2	unknown	—	—	—
└ 209.28.218.0/24	256	TECNOMATIX3	unknown	—	—	—
└ 209.28.219.0/24	256	TECNOMATIX4	unknown	—	—	—
└ 209.28.220.0/24	256	BAAN27	unknown	—	—	—
└ 209.28.222.0/24	256	WARTSILA4	unknown	—	—	—
└ 209.28.223.0/24	256	WARTSILA5	unknown	—	—	—
└ 209.28.224.0/24	256	WARTSILA6	unknown	—	—	—
└ 209.28.225.0/24	256	WARTSILA7	unknown	—	—	—
└ 209.28.226.0/24	256	FABRICOM1	unknown	—	—	—
└ 209.28.227.0/24	256	FABRICOM2	unknown	—	—	—
└ 209.28.228.0/26	64	MODO23	unknown	—	—	—
└ 209.28.228.192/27	32	SSAB8	unknown	—	—	—
└ 209.28.229.0/27	32	BIOTECH7	unknown	—	—	—
└ 209.28.229.64/27	32	CCNCSI2	unknown	—	—	—
└ 209.28.230.0/24	256	RESALDISCON1	unknown	—	—	—
└ 209.28.231.0/24	256	ABSATT1	unknown	—	—	—
└ 209.28.232.0/24	256	PHARMACIA64	unknown	—	—	—
└ 209.28.233.0/24	256	PHARMACIA65	unknown	—	—	—
└ 209.28.234.0/25	128	FETA4	unknown	—	—	—
└ 209.28.235.0/24	256	TELSTRAUK11	unknown	—	—	—
└ 209.28.236.0/24	256	TELSTRAUK12	unknown	—	—	—
└ 209.28.237.0/25	128	WARNACO3	unknown	—	—	—
└ 209.28.238.0/25	128	WARNACO1	unknown	—	—	—
└ 209.28.239.0/25	128	KVAERNER1	unknown	—	—	—
└ 209.28.239.128/26	64	SREMEX1	unknown	—	—	—
└ 209.28.240.0/24	256	SPENCERSTUART13	unknown	—	—	—
└ 209.28.241.0/24	256	TERUMO10	unknown	—	—	—
└ 209.28.242.0/24	256	SWIFTNET3	unknown	—	—	—
└ 209.28.243.0/24	256	PHARMACIA70	unknown	—	—	—
└ 209.28.244.0/24	256	PHARMACIA49	unknown	—	—	—
└ 209.28.245.0/24	256	PHARMACIA50	unknown	—	—	—
└ 209.28.246.0/24	256	IWATANI3	unknown	—	—	—
└ 209.28.247.0/24	256	PHARMACIA51	unknown	—	—	—
└ 209.28.248.0/24	256	AVIRNEX2	unknown	—	—	—
└ 209.28.249.0/24	256	HERBALIFE16	unknown	—	—	—
└ 209.28.250.0/24	256	COFACE7	unknown	—	—	—
└ 209.28.251.0/24	256	MAXIM2	unknown	—	—	—
└ 209.28.252.0/24	256	DATAGENERAL1	unknown	—	—	—
└ 209.28.253.0/24	256	DATAGENERAL2	unknown	—	—	—
└ 209.28.254.0/25	128	DORMEUIL7	unknown	—	—	—
└ 209.28.254.128/27	32	DYNO2	unknown	—	—	—
└ 209.28.254.192/27	32	MARLINK24	unknown	—	—	—
└ 209.28.255.0/24	256	PHARMACIA66	unknown	—	—	—

← Previous201–298 of 298 · page 2 of 2Next →

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Composition

The types across the prefix's announced space, by addresses.

Announced space

Address share

Announced space

Types across the prefix

65,536 addresses

Type	Addresses	Share	Ranges
Residential	59,321	91%	108
Business	6,215	9.5%	137

Network & registry

Announcement Routing history RPKI & IRR Whois & abuse

Origin network

AS3300

Name: British Telecommunications Limited
Type: Internet provider
Registered: Oct 28, 1994
Domain: bt.net
Website: www.bt.net
Industry: Internet Service Provider (ISP)
Spamhaus ASN-DROP: not listed

RPKI

Route origin authorizations

ROA prefix	ASN	Max len	Anchor	Verdict
209.28.0.0/16	AS3300	/24	ARIN	RPKI valid

IRR

Route objects on the exact prefix

Origin	Registry	Description	Maintainer	Modified
AS3300	REACH	REACH (Customer Route)	MAINT-REACH-NOC	Feb 10, 2017
AS3300	ALTDB	Proxy registration to prevent harm from ARIN-NONAUTH shutdown	MAINT-AS7034	Apr 4, 2022
AS3300	ARIN	BT-GIIB	MNT-INFO	Aug 1, 2025

IRR inside

Route objects inside

Prefix	Origin	Registry	Description	Maintainer	Modified
209.28.0.0/22	AS3300	ARIN	BT-GIIB	MNT-INFO	Aug 1, 2025
209.28.0.0/22	AS3300	NTTCOM	BT CNF	MAINT-BT	Mar 29, 2022
209.28.34.0/24	AS3300	REACH	REACH (Customer Route)	MAINT-REACH-NOC	Aug 3, 2007
209.28.44.0/24	AS3300	REACH	REACH (Customer Route)	MAINT-REACH-NOC	May 12, 2004
209.28.172.0/22	AS3300	NTTCOM	BT CNF	MAINT-BT	Mar 29, 2022

209.28.0.0/16

Announcements

Announcements inside

Registrations in this block

Composition

Address share

Types across the prefix

Network & registry

AS3300

Who has announced this prefix

Routing history

Route origin authorizations

Route objects on the exact prefix

Route objects inside

Registration for this announcement

Abuse contact