subnet.im

38.148.32.0/21

SumofiberAS4226

SumofiberAS33727

Announced by more than one origin AS (MOAS).

At a glance

Addresses

2,048

/21 block

Visibility

64%

51 of 80 vantage points

RPKI

No ROA

Registry

ARINUS

Allocated 16th April 1991

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: 5 observed paths to 38.148.32.0/21, fanning out from AS4226, AS33727 toward the vantage points that see it. Each path is written out in full beneath the graph.AS4226SumofiberOriginAS6461Zayo BandwidthAS8529Zain Omantel Inte…AS23352DEFT.COMAS20130Depaul UniversityAS33727SumofiberOriginAS62494UTOPIAAS53407UTOPIA FiberAS6939Hurricane Electri…AS213151Christian ElsenAS266213PLANETCLICK TELEC…AS132337Axclusive
  1. London, UK422664618529This path
  2. Oregon, US422664612335220130This path
  3. Amsterdam3372762494534076939213151This path
  4. Sao Paulo3372762494534076939266213This path
  5. Singapore3372762494534076939132337This 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. A heavier line in the graph means more vantage points reach the prefix that same way.

Route visibility

64%

Seen by 51 of 80 full-feed vantage points

Partially propagated

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
ARIN — North America
Country
United States
Allocated
16th April 1991
Allocation block
38.0.0.0/8
Status
allocated
Origin validation
No ROA

No ROA covers this prefix, so RPKI has nothing to say about it either way. This is still the common case for a large share of the routing table.

Prefix hierarchy

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

CoveringMore specific
Prefix hierarchy for 38.148.32.0/21: the announcements covering it on the left, the announcements inside it on the right. Every prefix drawn is also listed in the tables below.38.0.0.0/8AS17438.148.32.0/21AS4226This prefix38.148.40.0/21AS4226

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 38.148.32.0/21
PrefixAddressesOriginVisibility
38.0.0.0/816.8MAS174Cogent Communications, LLC78/80

More specific announcements

Nothing inside this block is announced separately.

Sibling prefixes

Prefixes of the same length sharing a parent block with 38.148.32.0/21
PrefixAddressesOriginVisibility
38.148.40.0/212kAS4226Sumofiber80/80

History

  1. AS3372712th August 2026 — present
  2. AS422612th 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 38.148.32.0/21 in the calculator/21 reference

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