ARIN Waiting List Recipients Begin Receiving Allocated IPs from 131.143.0.0/16
Hello, 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.
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
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
most recent ARIN issued report [arin-issued] Daily Report for 2025-10-07 Add 131.143.16.0-131.143.19.255 through Add 131.143.235.0-131.143.235.255 131.143.0.0/16 was issued to Rockwell so its easy to see that there could be blocks that existed globally. Trey On 10/8/25 1:04 PM, Ezri Zhu via NANOG 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!
On Wed Oct 8, 2025 at 11:04 AM EDT, Zhang Gaoxing wrote:
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.
I see, following my reply I was approved for ARIN WhoWas for historic WHOIS, however it seems like they only support singular IP address lookups. I have followed up with their support to see if I can see the history of a /16 block. Best, -- Ezri
https://stat.ripe.net/resource/131.143.126.1#tab=overview < from here only AS13509 announces it before, but it is an APNIC ASN? It was announced by mistake or it belonged to APNIC and was transferred to ARIN for some reason? Trey Scarborough via NANOG <nanog@lists.nanog.org>于2025年10月8日 周三下午11:19写道：
most recent ARIN issued report
[arin-issued] Daily Report for 2025-10-07
Add 131.143.16.0-131.143.19.255 through Add 131.143.235.0-131.143.235.255
131.143.0.0/16 was issued to Rockwell so its easy to see that there could be blocks that existed globally.
Trey
On 10/8/25 1:04 PM, Ezri Zhu via NANOG 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!
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participants (3)
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Ezri Zhu -
Trey Scarborough -
Zhang Gaoxing