LAYER3 INTEL
Get started
TripwireIntel APIIP IntelPricingBlogDocsContactSign in
Data as of Nov 3, 2026

121.136.0.0/13

25 anonymizer addresses · <0.01% · VPN

Korea Telecom

Announcement
this exact prefix
No RPKI
Announced by
AS4766
Type
Residential
99% of it

Residential-proxy exits

Proxy exits
3,271
0.62% of its addresses · listed by providers
Always-on exits
164
5.0% of its exits
Spread
1,330 of 2,048
/24s with at least one exit
Providers
105
selling exits here

/24s with the most always-on exits

/24Always-on exitsProxy exits
121.142.200.0/2425
121.139.93.0/2423
121.142.9.0/2423
121.142.210.0/2423
121.141.214.0/2422
121.136.106.0/24111
121.141.112.0/2417
121.136.146.0/2417
121.137.102.0/2416
121.140.205.0/2416
121.140.119.0/2416
121.140.111.0/2416
121.137.237.0/2416
121.136.14.0/2416
121.141.143.0/2416
121.136.10.0/2415
121.140.220.0/2415
121.141.168.0/2415
121.137.148.0/2415
121.143.160.0/2415
121.137.240.0/2415
121.138.62.0/2415
121.140.253.0/2415
121.136.203.0/2415

Proxy providers listing exits

  • 2Captcha
  • 711Proxy
  • 9Proxy
  • Ake.net
  • AnyIP
  • B2Proxy
  • BartProxies
  • BestProxy
  • BirdProxies
  • BlurPath
  • BottingTools
  • Bright Data
  • BuyingProxy
  • ByteProxies
  • Byteful
  • CatProxies
  • CliProxy
  • CoreProxy
  • DataImpulse
  • Datarama
  • Decodo
  • EZProxies
  • EnigmaProxy
  • Evomi
  • FastProxy
  • FlashProxy
  • FlexyProxies
  • FloppyData
  • GSocks
  • Geonix
  • Geonode
  • GloryCloud
  • GoProxies
  • GonzoProxy
  • HideProxy
  • HydraProxy
  • IPCola
  • IPFly
  • IPOasis
  • IPPeak
  • IPRoyal
  • Infatica
  • InfiniteProxies
  • KindProxy
  • KocerRoxy
  • Kookey
  • LemonBright
  • LemonLabs
  • LemonPrime
  • LightningProxies
  • LudaxProxy
  • MagneticProxy
  • MangoProxy
  • MarsProxies
  • Maskify
  • MoMoProxy
  • NSocks
  • NextProxy
  • NodeMaven
  • NodeProxy
  • NovProxy
  • NovaProxy
  • Novada
  • Oxylabs
  • PacketStream
  • PrivateByte
  • Proxies.fo
  • ProxiesVision
  • Proxio
  • Proxiware
  • Proxy-Cheap
  • Proxy-Seller
  • Proxy4U
  • ProxyEmpire
  • ProxyGeo
  • ProxyHat
  • ProxyRack
  • ProxyStyler
  • ProxyWing
  • Proxying
  • Proxyma
  • PuraRoute
  • Q2IP
  • RainProxy
  • RapidProxy
  • ResiProxies
  • RoamProxy
  • RolaProxy
  • Shifter
  • Smartproxy
  • SpyderProxy
  • StrikeProxy
  • SwiftProxy
  • TalorData
  • Thordata
  • ThunderProxy
  • TrueProxies
  • TrustProxy
  • VantageProxies
  • VibeProxies
  • VitalData
  • VitalExclusive
  • VitalProxy
  • WealthProxies
  • YumiProxy
IPv4 market

Path

1 · Holder
Korea Telecom
2 · Leased from
not leased
3 · Announced by
AS4766 Korea Telecom
since Dec 2009 · 16.9 yr ago
4 · Use
VPN servicesnamed VPN Gate
Residential

Operators, sellers and brokers

VPN services

NameParentIn 121.136.0.0/13/24s
VPN GateUniversity of Tsukuba
25<0.01%
25

Lineage

How this block came to its use, oldest first. The whole IPv4 market →

121.136.0.0/13

From the registry to its use

  1. Dec 9, 2007
    Route object
    AS9530 SHINSEGAE I C Co., Ltd.
    RADB route object for AS9530 SHINSEGAE I C Co., Ltd., maintainer MAINT-AS3786
    121.140.152.0/24
  2. May 4, 2008
    Route object
    AS10177 Fubon Hyundai Life Insurance CO.,LTD
    NTTCOM route object for AS10177 Fubon Hyundai Life Insurance CO.,LTD, maintainer MAINT-HANARO
    121.140.138.0/24
  3. Sep 8, 2009– today
    Announced
    AS4766 Korea Telecom
    as part of 121.128.0.0/12
    121.128.0.0/12
  4. Dec 8, 2009– today
    Announced
    AS4766 Korea Telecom
    Internet provider
  5. Mar 29, 2010
    Route object
    AS45400 Korea Telecom
    NTTCOM route object for AS45400 Korea Telecom, maintainer MAINT-HANARO
    121.137.104.0/24
  6. Jan 3, 2019
    Route object
    AS55609 Financial Security Institute
    RADB route object for AS55609 Financial Security Institute, maintainer MAINT-AS9318
    121.136.89.0/24
  7. Jan 3, 2019
    Route object
    AS55609 Financial Security Institute
    RADB route object for AS55609 Financial Security Institute, maintainer MAINT-AS9318
    121.137.200.0/24
  8. Jun 7, 2020
    Route object
    AS4766 Korea Telecom
    RADB route object for AS4766 Korea Telecom, maintainer MAINT-AS4766
    121.143.57.0/24
  9. Jun 23, 2025
    Route object
    AS10178 Kakaopay Corp
    RADB route object for AS10178 Kakaopay Corp, maintainer MAINT-AS10178
    121.140.77.0/24
  10. today
    Registry record
    Korea Telecom
    ALLOCATED PORTABLE
    121.128.0.0/11
  11. today
    Used
    VPN Gate
    VPN

Announcements

Less specific

Covering announcements

PrefixOriginTypeProxy exitsHolderRPKI
121.128.0.0/12
since Sep 2009
AS4766Residential6,485
318 always on
Korea Telecom
121.128.0.0/11
since Apr 2006
AS4766Residential12,556
606 always on
Korea Telecom
Nesting

More-specifics by size

Sized by addresses, colored by each announcement's type. Click a tile with children to zoom in, a leaf to open it.
More specific

Announcements inside

Arrived
PrefixOriginTypeProxy exitsHolderRPKI
121.137.87.0/24
since Oct 2011
AS46009Unknown1Korea Telecom
121.137.88.0/24
since Oct 2011
AS46009Unknown1Korea Telecom
121.137.89.0/24
since Oct 2011
AS46009Unknown3Korea Telecom
121.137.90.0/24
since Oct 2011
AS46009UnknownKorea Telecom
121.137.94.0/24
since Oct 2011
AS46009Unknown1Korea Telecom
121.137.95.0/24
since Oct 2011
AS46009Unknown2Korea Telecom
121.137.96.0/24
since Oct 2011
AS46009UnknownKorea Telecom
121.137.105.0/24
since Oct 2011
AS46009UnknownKorea Telecom
121.137.106.0/24
since Oct 2011
AS46009Unknown2Korea Telecom
121.137.107.0/24
since Oct 2011
AS46009UnknownKorea Telecom
121.137.151.0/24
since Dec 2008
AS4766Residential1
1 always on
Korea Telecom
121.137.185.0/24
since Feb 2014
AS4766Residential1
1 always on
Korea Telecom
121.138.29.0/24
since Aug 2016
AS55630BusinessKorea Telecom
121.138.30.0/24
since Aug 2016
AS55630BusinessKorea Telecom
121.138.156.0/24
since Oct 2024
AS9273BusinessKorea Telecom
121.139.137.0/24
since Sep 18, 2026
AS3786Residential1Korea Telecom
121.140.42.0/25AS9701Hosting1Korea Telecom
121.140.50.0/24
since Oct 2019
AS55592HostingKorea Telecom
121.140.76.0/24
since Oct 2025
AS9524BusinessKorea Telecom
121.140.97.0/24
since Sep 2006
AS9530BusinessKorea Telecom
121.140.104.0/24
since Oct 2019
AS55592HostingKorea Telecom
121.140.118.0/24
since Oct 2019
AS55592HostingKorea Telecom
121.140.137.0/24
since Oct 2019
AS55592HostingKorea Telecom
121.141.42.0/24
since Dec 2025
AS4766ResidentialKorea Telecom
121.141.60.0/24
since Jan 2023
AS9526BusinessKorea Telecom
121.141.101.0/24
since Oct 2019
AS9776BusinessKorea Telecom
121.141.229.0/24
since Jan 2023
AS9526BusinessKorea Telecom
121.143.242.0/24
since Nov 2014
AS9968BusinessKorea Telecom

Composition

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

Announced space

Address share

Announced space

Types across the prefix

524,288 addresses
TypeAddressesShareRanges
Residential518,24799%50
Unknown2,5600.49%10
Business1,7920.34%7
Hosting1,6640.32%7
VPNanonymizer25<0.01%25

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Origin network

AS4766

KR
Name
Korea Telecom
Type
Internet provider
Registered
Apr 22, 1996
Domain
kt.com
Website
www.kt.com/eng/main.jsp
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed
VPN servers
1