AS213959 — AltStack ObSimRef Diensten B.V. trading as AltStack

AS213959 announces 2 IPv4 prefixes covering 512 addresses and 1 IPv6 prefixes.

About this network

The AS handle ALTSTACK is held by AltStack (registered as ObSimRef Diensten B.V. trading as AltStack).

What it's used for

• The address space carries residential customer traffic, evidenced by reverse DNS entries such as client.at.altstack.eu across both announced IPv4 blocks.
• The network announces 512 IPv4 addresses and 1 IPv6 prefix, maintaining 22 upstream or peer neighbours; this ratio of modest address space to a high neighbour count indicates a regional access provider rather than a transit carrier.
• Traffic originates from end-user devices connected via the operator's access network, consistent with its role as a Dutch internet service provider.

Notable

• Registrant data for the 157.173.74.0/24 block aligns with the AS holder, listing "ObSimRef Diensten B.V. trading as AltStack" as the registrant with the netname AltStack.
• The 185.104.131.0/24 block is registered under the netname OSRD-NETWORK with an abuse contact role, reflecting the operator's historical or alternative branding.
• The inventory consists of two /24 IPv4 prefixes and a single /48 IPv6 prefix, all located in the Netherlands.

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

Announced prefixes

• 157.173.74.0/24
• 185.104.131.0/24
• 2001:67c:f54::/48

Upstream networks

• AS42093 InterRacks B.V.
• AS202585 Nick Bouwhuis
• AS6939 Hurricane Electric LLC
• AS212895 Johannes Ernst
• AS24482 SG.GS
• AS34019 Hivane Association
• AS37721 Virtual Technologies & Solutions
• AS34927 iFog GmbH
• AS31500 Global Network Management Inc

Adjacent networks

• AS42093 InterRacks B.V.
• AS202585 Nick Bouwhuis
• AS6939 Hurricane Electric LLC
• AS212895 Johannes Ernst
• AS24482 SG.GS
• AS34019 Hivane Association
• AS31500 Global Network Management Inc
• AS34927 iFog GmbH
• AS37721 Virtual Technologies & Solutions

Routing security

• RPKI: 3 valid, 0 invalid and 0 not-found announcements; 3 ROAs.
• ASPA: 3 authorised providers.
• IRR: 100% of announcements registered; 3 route objects.
• Listed in as-sets: AS-FRYS-IX-CONNECTED, AS-HURRICANE, AS-HURRICANEV6, AS-INTERRACKS, AS-RETN-ACTUAL-V4, AS-RETN-ACTUAL-V6, AS202585:AS-CUSTOMERS, AS202585:AS-CUSTOMERS-MANUAL, AS213959:AS-ALTSTACK, AS215549:AS-ENSIX, AS52025:AS-DOWNSTREAMS-AMSTERDAM, AS52025:AS-DOWNSTREAMS-ASHBURN, AS52025:AS-DOWNSTREAMS-AUCKLAND, AS52025:AS-DOWNSTREAMS-FRANKFURT, AS52025:AS-DOWNSTREAMS-FREMONT, AS52025:AS-DOWNSTREAMS-KANSASCITY, AS52025:AS-DOWNSTREAMS-NEWARK, AS52025:AS-DOWNSTREAMS-SINGAPORE, AS52025:AS-DOWNSTREAMS-STOCKHOLM, AS52025:AS-DOWNSTREAMS-SYDNEY, AS52025:AS-DOWNSTREAMS-TOKYO, AS52025:AS-DOWNSTREAMS-TORONTO.

Internet exchanges

• The Frys Internet Exchange — Frysian, Netherlands