216.31.0.0/18

Currently announced by AS23028 Team Cymru, in the routed prefix 216.31.0.0/18.

Current ASN: AS23028; Team Cymru
Routed prefix: 216.31.0.0/18; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 216.31.0.0/18

Routing data · Nov 2, 2026, 08:23 UTC

ASN historyEvery routed prefix covering 216.31.0.0/18

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
216.31.0.0/18	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing

More specific routes23 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
216.31.0.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.1.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.2.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.3.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.4.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.6.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.7.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.8.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.9.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.10.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.11.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.12.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.13.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.14.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.15.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.17.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.18.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.19.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.20.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.36.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.37.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.38.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing
216.31.39.0/24	AS23028	Team Cymru	United States	Before monitoring	2026-11-02 08:23	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

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RIR allocation record

Registry: ARIN
Allocated block: 216.31.0.0/18
Country: United States
Allocation date: 2022-01-28
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.