AS206075 — HOLLANDER-JACOBSEN Hollander & Jacobsen UG (haftungsbeschraenkt)

AS206075 announces 4 IPv4 prefixes covering 1,024 addresses and 2 IPv6 prefixes.

About this network

HOLLANDER-JACOBSEN is operated by Hollander & Jacobsen UG (haftungsbeschraenkt).

What it's used for

• The address space carries internal corporate infrastructure, evidenced by reverse DNS entries such as cloud.ffw-rd.de, heartbeat-2, and sto10.heart.
• The AS announces 1024 IPv4 addresses across 4 prefixes and 2 IPv6 prefixes, while maintaining 18 observed neighbours.
• This ratio of a small, subdivided address inventory against a moderate number of peering relationships indicates an internal corporate estate with site-by-site segmentation rather than a public access or transit network.

Notable

• All four announced IPv4 prefixes share the netname pattern DE-HOLLANDER-JACOBSEN and list "Network Operations Center; Hollander & Jacobsen UG (haftungsbeschraenkt)" as the registrant, confirming consistent ownership.
• The inventory consists of four distinct /24 blocks and two IPv6 prefixes, reflecting a fragmented but self-contained corporate address space.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 31.41.249.0/24
• 91.218.20.0/24
• 188.239.191.0/24
• 193.36.132.0/24
• 2a07:e040::/32
• 2a07:e042::/32

Upstream networks

• AS3257 GTT Communications Inc.
• AS212477 RoyaleHosting BV

Downstream networks

• AS215960 Hollander & Jacobsen UG (haftungsbeschraenkt)
• AS40663 IncogNet LLC
• AS212085 Alexander Bruegmann
• AS206042 Suhail Haris
• AS204789 BIZBETA LTD
• AS215956 Dennis de Houx trading as All In One
• AS200690 Junxiao Shi

Adjacent networks

• AS3257 GTT Communications Inc.
• AS215960 Hollander & Jacobsen UG (haftungsbeschraenkt)
• AS3399 Obenet AB
• AS40663 IncogNet LLC
• AS212477 RoyaleHosting BV
• AS6939 Hurricane Electric LLC
• AS212085 Alexander Bruegmann
• AS215956 Dennis de Houx trading as All In One
• AS206042 Suhail Haris
• AS204789 BIZBETA LTD
• AS24482 SG.GS
• AS200690 Junxiao Shi
• AS20473 The Constant Company, LLC

Routing security

• RPKI: 6 valid, 0 invalid and 0 not-found announcements; 7 ROAs.
• ASPA: 4 authorised providers.
• IRR: 100% of announcements registered; 8 route objects.
• Listed in as-sets: AS-GTTCUST, AS-GTTCUST6, AS-SKYLINK, AS200690:AS-UPSTREAM, AS206075:AS-RIPE, AS209512:AS-UPSTREAM, AS212085:AS-UPSTREAMS, AS215956:AS-UPSTREAM, AS25091:AS-PEERS.

Internet exchanges

• Speed Internet Exchange — Dronten, Netherlands
• Sweden Open Network Internet eXchange Stockholm — Stockholm, Sweden