81.90.168.0/21

Residential-proxy exits

Proxy exits

47

2.3% of its addresses · 30 days

Always-on exits

6

13% of its exits

Spread

3 of 8

/24s with at least one exit

Providers

52

selling exits here

Oct 9, 2026 – Nov 7, 2026

Exits seen per day

5.0K observations

Residential
Business

/24s with the most always-on exits

/24	Always-on exits	Proxy exits
81.90.173.0/24	4	30
81.90.168.0/24	1	13
81.90.170.0/24	1	4

Proxy providers listing exits

2Captcha
Ake.net
AnyIP
BartProxies
BirdProxies
BottingTools
ByteProxies
Byteful
CliProxy
Decodo
EnigmaProxy
FastProxy
FlashProxy
GSocks
Geonix
Geonode
GloryCloud
GonzoProxy
HydraProxy
IPFly
IPOasis
Infatica
LemonBright
LemonLabs
LightningProxies
MangoProxy
NodeMaven
NodeProxy
NovaProxy
Novada
Oxylabs
Proxiware
Proxy-Seller
ProxyEmpire
ProxyGeo
ProxyHat
ProxyStyler
ProxyWing
Proxyma
RainProxy
RapidProxy
Shifter
StrikeProxy
Thordata
ThunderProxy
VantageProxies
VibeProxies
VitalData
VitalExclusive
VitalProxy
Webshare
ZENPROXY_PREMIUM

Announcements

Less specific

Covering announcements

Prefix	Origin	Type	Proxy exits	Holder	RPKI
81.90.160.0/20 since Nov 2016	AS5610	Residential	47 6 always on	O2 Czech Republic, a.s.

More specific

Announcements inside

Prefix	Origin	Type	Proxy exits	Holder
81.90.168.0/24 since Jun 2016	AS5610	Residential	13 1 always on	O2 Czech Republic, a.s.
81.90.170.0/24 since Jun 2016	AS5610	Residential	4 1 always on	O2 Czech Republic, a.s.
81.90.173.0/24 since Jun 2016	AS5610	Residential	30 4 always on	O2 Czech Republic, a.s.

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
81.90.160.0/20	4,096	CZ-CZNET-20020704	O2 Czech Republic, a.s. (ORG-STAN1-RIPE) · CZ	ALLOCATED PA	Nov 14, 2017	abuse@o2.cz
└ 81.90.168.0/24	256	ELSATNET-CZ	Elsat spol. s r.o.	ASSIGNED PA	May 23, 2003	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.169.0/24	256	CZ-INTEM-NET	Intem s.r.o.	ASSIGNED PA	Jun 10, 2003	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.170.0/26	64	ELSATNET-CZ	Elsat spol. s r.o.	ASSIGNED PA	Apr 26, 2005	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.170.64/26	64	ELSATNET-CZ	Elsat spol. s r.o.	ASSIGNED PA	Nov 21, 2005	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.171.0/24	256	CZ-VIMPERKNET	Herbia s.r.o.	ASSIGNED PA	Feb 15, 2005	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.172.0/24	256	CZ-STRAZNYNET	OS Strazny.NET	ASSIGNED PA	Dec 4, 2008	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.173.0/25	128	ELSATNET-CZ	Elsat spol. s r.o.	ASSIGNED PA	Jun 14, 2004	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.173.128/26	64	ELSATNET-CZ	Elsat spol. s r.o.	ASSIGNED PA	Nov 11, 2004	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.173.192/26	64	CZ-KNIZEK	Jiri Knizek - PC SERVIS PCKB	ASSIGNED PA	Jan 27, 2005	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.174.0/24	256	CZ-TERMSNET	TERMSnet - P2P lines to customers	ASSIGNED PA	Mar 5, 2007	abuse@o2.cz via CZ-CZNET-20020704
└ 81.90.175.0/24	256	CZ-TERMSNET	TERMSnet	ASSIGNED PA	Oct 7, 2004	abuse@o2.cz via CZ-CZNET-20020704

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

2,048 addresses

Type	Addresses	Share	Ranges
Residential	1,664	81%	5
Business	384	19%	5

Network & registry

Announcement Routing history RPKI & IRR Whois & abuse

Origin network

AS5610

CZ

Name: O2 Czech Republic, a.s.
Type: Internet provider
Registered: Apr 25, 1996
Domain: o2.cz
Website: www.o2.cz
Spamhaus ASN-DROP: not listed

RPKI

Route origin authorizations

ROA prefix	ASN	Max len	Anchor	Verdict
81.90.168.0/21	AS5610	/21	RIPE	RPKI valid
81.90.160.0/20	AS5610	/20	RIPE	Too specific

IRR

Route objects on the exact prefix

Origin	Registry	Description	Maintainer	Modified
AS5610	RIPE		AS5610-MTN	Aug 31, 2025