SUBNET.IM

192.248.40.0/21

Lanka Education & Research Network, NRENAS38229

At a glance

Addresses

2,048

/21 block

Visibility

36%

29 of 80 vantage points

RPKI

Invalid

Registry

APNICLK

Allocated 22nd July 2010

AS paths to this prefix

One real path per vantage point, fanning out from the origin. Where two reach the prefix the same way, those hops are drawn once. Open a path to follow it hop by hop.

OriginVantage points
AS path graph: 1 observed path to 192.248.40.0/21, fanning out from AS38229 toward the vantage points that see it. Each path is written out in full beneath the graph.AS38229Lanka Education &…OriginAS18001Dialog Axiata PLC.AS8966Etisalat (E&)AS132337Axclusive
  1. Singapore38229180018966132337This path

Each row is one path genuinely present in the routing table at our last snapshot, read outward from the origin to the vantage point that saw it. Open a row to follow that one path hop by hop.

Route visibility

36%

Seen by 29 of 80 full-feed vantage points

Seen by few vantage points

Observed at 5 of our collectors.

What this percentage counts

The denominator counts only full-feed peers — peers carrying a substantially complete routing table at the moment of the snapshot. IXP route-server peers usually feed partial tables and are excluded, because including them would make a normally propagated prefix look as though half the internet could not see it.

It measures how widely an announcement has spread across the networks we can observe. It says nothing about whether the prefix is reachable from any particular place, or how it performs.

Registry and RPKI

RIR
APNIC — Asia-Pacific
Country
Sri Lanka
Allocated
22nd July 2010
Allocation block
192.248.0.0/17
Status
allocated
Origin validation
Invalid

A ROA covers this prefix but does not authorise this origin AS at this prefix length. That is either a misconfiguration or a hijack, and many networks will drop the route.

ROAs covering this prefix

Route Origin Authorisations covering 192.248.40.0/21
ROA prefixAuthorised originMax length
192.248.32.0/19AS38229/19
192.248.0.0/17AS38229/17

Prefix hierarchy

Announcements above, below and beside this one in the real routing table.

CoveringMore specific
Prefix hierarchy for 192.248.40.0/21: the announcements covering it on the left, the announcements inside it on the right. Every prefix drawn is also listed in the tables below.192.248.32.0/19AS38229192.248.0.0/17AS38229192.248.40.0/21AS38229This prefix

Left to right is specificity: a shorter mask covering more address space, then this prefix, then the announcements carved out inside it. Only the first few of each are drawn — the tables below list them all.

Covering announcements

Announcements that contain 192.248.40.0/21
PrefixAddressesOriginVisibility
192.248.32.0/198.2kAS38229Lanka Education & Research Network, NREN2/80
192.248.0.0/1732.8kAS38229Lanka Education & Research Network, NREN80/80

More specific announcements

Nothing inside this block is announced separately.

Sibling prefixes

No prefix of the same length in the same parent block is announced.

History

  1. AS3822912th August 2026 — present
Why these dates start where they do

A first-seen date is the first time we saw that origin, not the first time it appeared in BGP. Our history is forward-only with no backfill, so it says nothing about the period before we started collecting — treat the earliest dates with suspicion.

Open 192.248.40.0/21 in the calculator/21 reference

Routing data derived from RouteViews MRT archives and public registry data.