51.39.0.0/18

Currently announced by AS43766 Zain KSA, in the routed prefix 51.39.0.0/18.

Current ASN: AS43766; Zain KSA
Routed prefix: 51.39.0.0/18; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: RIPENCC; Saudi Arabia · 51.39.0.0/16

Routing data · Nov 2, 2026, 02:24 UTC

ASN historyEvery routed prefix covering 51.39.0.0/18

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.39.0.0/18	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.0.0/16	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped

More specific routes86 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.39.0.0/19	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.0.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.0.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.1.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.2.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.2.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.3.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.4.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.4.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.5.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.6.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.6.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.7.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.8.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.8.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.9.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.10.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.10.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.11.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.12.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.12.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.13.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.14.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.14.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.15.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.16.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.16.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.17.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.18.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.18.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.19.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.20.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.20.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.21.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.22.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.22.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.23.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.24.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.24.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.26.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.28.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.28.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.30.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.30.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.31.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.32.0/19	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.32.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.32.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.33.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.34.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.34.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.35.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.36.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.38.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.40.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.40.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.41.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.42.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.42.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.43.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.44.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.46.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.48.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.48.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.49.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.50.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.50.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.51.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.52.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.52.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.53.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.54.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.54.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.55.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.56.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.56.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.57.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.58.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.58.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.59.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.60.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.60.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.61.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.62.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.62.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.63.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	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: RIPENCC
Allocated block: 51.39.0.0/16
Country: Saudi Arabia
Allocation date: 1993-09-01
Status: assigned

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.