AS51896 — HRINGDU-AS Hringdu ehf

AS51896 announces 7 IPv4 prefixes covering 20,736 addresses and 1 IPv6 prefixes.

About this network

HRINGDU-AS is operated by Hringdu ehf.

What it's used for

• The address space carries residential and business access traffic, evidenced by reverse DNS entries such as fiber.hringdu.is, dynamic.hringdu.is, vps.hringdu.is, and xdsl.hringdu.is.
• The AS announces 20,736 IPv4 addresses across 7 prefixes and 1 IPv6 prefix, while maintaining only 3 observed routing neighbours. This high address-to-neighbour ratio indicates an access network rather than a transit provider.
• Traffic from this AS consists of subscriber eyeballs and small business endpoints, reflecting Hringdu's role as an Icelandic telecommunications provider offering fiber, DSL, and VPS services.

Notable

• Registrants for the majority of prefixes are Hringdu ehf or Hringdu NOC, consistent with the AS holder. One prefix (31.209.144.0/20) is registered to Mila hf, a separate Icelandic network operator, suggesting a specific block allocation or historical relationship.
• The inventory is composed of multiple distinct IPv4 blocks, including a /19, two /20s, a /21, two /22s, and a /24, alongside a single /29 IPv6 prefix.

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

Announced prefixes

• 31.209.136.0/21
• 31.209.144.0/20
• 46.22.96.0/20
• 89.17.128.0/19
• 154.194.43.0/24
• 157.157.184.0/22
• 185.191.232.0/22
• 2a00:5000::/29

Upstream networks

• AS6677 Mila hf

Adjacent networks

• AS6677 Mila hf

Routing security

• RPKI: 10 valid, 0 invalid and 0 not-found announcements; 10 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 15 route objects.
• Listed in as-sets: AS-365NET-RIX, AS-DCG-RIX, AS-HRINGDU, AS-HURRICANEV6, AS-SIP-RIX, AS39532:AS-LANDSBANKINN-RIX, AS51202:AS-ALL.

Internet exchanges

• Reykjavik Internet Exchange — Reykjavik, Iceland