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Data as of Nov 12, 2026

185.37.4.0/23

No anonymizer space · no proxy exits in 30 days

A2B IP B.V. · space held by Advanced Team Systems Center B.V.

Announcement
this exact prefix
RPKI valid
Announced by
AS51088
Type
Unknown
Risk
40 / 100 · Medium
Leased space

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
185.37.4.0/221,024NL-ATSC-20131007Advanced Team Systems Center B.V. (ORG-ATSC2-RIPE) · NLALLOCATED PAOct 7, 2013abuse@a2b-internet.com
└ 185.37.4.0/2732ATSC-NETATSC InfrastructureASSIGNED PAOct 7, 2013abuse@a2b-internet.com
via NL-ATSC-20131007
└ 185.37.4.32 - 185.37.4.5928ATSC-Hostinghosting - nl.atscASSIGNED PANov 7, 2013abuse@a2b-internet.com
via NL-ATSC-20131007
└ 185.37.5.0/2816Concorp-HostingConcorp hosting - nl.atscASSIGNED PANov 7, 2013abuse@a2b-internet.com
via NL-ATSC-20131007
└ 185.37.5.16/2816Ladder9-hostingLadder 9 hosting - nl.atscASSIGNED PANov 7, 2013abuse@a2b-internet.com
via NL-ATSC-20131007
└ 185.37.5.32 - 185.37.5.4514Woonlinie-HostingWoonlinie hosting - nl.atscASSIGNED PANov 7, 2013abuse@a2b-internet.com
via NL-ATSC-20131007

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

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Routing timeline

Who has announced this prefix

Summary

Routing history

Pattern
Stable
First seen
Feb 2014
Current origin since
Feb 2014 · 13 yr
Origin networks
1