asn.dev

Autonomous system

AS55991 AS55991-36 - CNNIC ASN block

Unclassified APNIC

IPv4 addresses 8.96K 10 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly CN
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

ERX-NASDA

China · AI-generated

business china nasda

The AS handle is ERX-NASDA-ASN and the holder is ERX-NASDA.

What it's used for

  • The address space carries netnames ZJCERT and XUANYUN, registered under IRT-ZJCERT-CN and IRT-XUANYUN-CN respectively.
  • The AS announces 8960 IPv4 addresses across 10 prefixes, with a single observed neighbour, indicating a small, self-contained network rather than a transit provider.
  • Traffic from this AS consists of internal corporate or organizational endpoints associated with the ZJCERT and XUANYUN registrants.

Notable

  • Registrants IRT-ZJCERT-CN and IRT-XUANYUN-CN are distinct from the AS holder name, suggesting the address space is managed by specific technical or administrative entities within the organization.
  • The inventory consists of ten small IPv4 blocks, primarily /22s, with no IPv6 prefixes announced.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS58461No.288,Fu-chun Road1,074

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-07, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 10 prefixes · 8.96K addresses IPv6 0 prefixes

CountryNamePrefixes
CNChina10

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS55956 - AS56015
Registered
2010-12-23
Last changed
2010-12-23
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 21 valid, 0 with no ROA
ROAs
22 authorising AS55991
ASPA
no ASPA record
IRR
90% registered · 19 of 21 announcements
Route objects
16 naming AS55991

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 454 networks and 1,852 prefixes, as published 2026-11-08. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check