SUBNET.IM

154.66.176.0/21

Network Platforms (PTY) LTDAS37497

At a glance

Addresses

2,048

/21 block

Visibility

1%

1 of 80 vantage points

RPKI

Valid

Registry

AFRINICZA

Allocated 6th November 2013

AS paths to this prefix

No AS paths are stored for this prefix. We keep the full path from one reference peer per collector rather than from every peer, so a prefix only has paths here once it has been seen by one of those peers.

Route visibility

1%

Seen by 1 of 80 full-feed vantage points

Seen by few vantage points

Observed at 1 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
AFRINIC — Africa
Country
South Africa
Allocated
6th November 2013
Allocation block
154.66.176.0/20
Status
allocated
Origin validation
Valid

A ROA exists that authorises this origin AS to announce this prefix at this length.

ROAs covering this prefix

Route Origin Authorisations covering 154.66.176.0/21
ROA prefixAuthorised originMax length
154.66.176.0/20AS37497/30

Prefix hierarchy

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

CoveringMore specific
Prefix hierarchy for 154.66.176.0/21: the announcements covering it on the left, the announcements inside it on the right. Every prefix drawn is also listed in the tables below.154.66.176.0/20AS37497154.66.176.0/21AS37497This prefix154.66.184.0/21AS37497154.66.176.0/22AS37497154.66.180.0/22AS37497154.66.176.0/23AS37497154.66.178.0/23AS37497154.66.180.0/23AS37497+19 more

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 154.66.176.0/21
PrefixAddressesOriginVisibility
154.66.176.0/204.1kAS37497Network Platforms (PTY) LTD80/80

Sibling prefixes

Prefixes of the same length sharing a parent block with 154.66.176.0/21
PrefixAddressesOriginVisibility
154.66.184.0/212kAS37497Network Platforms (PTY) LTD1/80

History

  1. AS3749712th 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 154.66.176.0/21 in the calculator/21 reference

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