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Re: ARIN Waiting List Recipients Begin Receiving Allocated IPs from 131.143.0.0/16


From: Zhang Gaoxing via NANOG <nanog () lists nanog org>
Date: Wed, 8 Oct 2025 19:04:04 +0400

NetRange:       131.143.124.0 - 131.143.124.255
CIDR:           131.143.124.0/24
NetName:        BLUETYPE-CHI-01
NetHandle:      NET-131-143-124-0-1
Parent:         NET131 (NET-131-0-0-0-0)
NetType:        Direct Allocation
OriginAS:
Organization:   BlueType LLC (BL-1105)
RegDate:        2025-10-07
Updated:        2025-10-07
Ref:            https://rdap.arin.net/registry/ip/131.143.124.0
NetRange:       131.143.124.0 - 131.143.124.255
CIDR:           131.143.124.0/24
NetName:        BLUETYPE-CHI-01
NetHandle:      NET-131-143-124-0-1
Parent:         NET131 (NET-131-0-0-0-0)
NetType:        Direct Allocation
OriginAS:
Organization:   BlueType LLC (BL-1105)
RegDate:        2025-10-07
Updated:        2025-10-07
Ref:            https://rdap.arin.net/registry/ip/131.143.124.0


I noticed that the ARIN Waiting List has recently decreased quite a bit.
Then I found that a new company I’ve been following, along with several
others, has received newly allocated IPs from this same range. The
allocations might not cover the entire /16 block, but these new IP
assignments don’t appear in ARIN’s cleared IPv4 blocks list
<https://www.arin.net/resources/guide/ipv4/blocks_cleared/> — perhaps it
just hasn’t been updated yet.

On Wed, 8 Oct 2025 at 22:04, Ezri Zhu <me () ezrizhu com> wrote:

zgx,

On Wed Oct 8, 2025 at 9:39 AM EDT, Zhang Gaoxing via NANOG wrote:
I have noticed that the number of people on the ARIN Waiting List has
been
decreasing significantly recently, and some have started receiving IP
allocations from the 131.143.0.0/16 range. I also found that these IPs
were
previously geolocated in Switzerland. Were these addresses reclaimed from
an organisation? I’m curious about the origin of these IPs.

Have you checked out
https://stat.ripe.net/resource/131.143.0.0-131.143.207.255#tab=database
yet? it has some nice graphs showing all the historical
announcements from that range. Sadly the page takes forever to
load due to the size.

However, I failed to find the 131.143.0.0/16 range from the ARIN
"Cleared for Waiting List" CSV, may I ask how you found that
range?

btw, i'd recommend signing up for
https://www.arin.net/reference/research/whowas/ as that's
probably your best bet.

let us know how it goes!

--
ezri

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