51.39.128.0/18

Currently announced by AS43766 Zain KSA, in the routed prefix 51.39.128.0/18.

Current ASN: AS43766; Zain KSA
Routed prefix: 51.39.128.0/18; 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 51.39.128.0/18

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.39.128.0/18	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 routes57 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.39.128.0/20	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.128.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.128.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.130.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.132.0/22	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.132.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.134.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.136.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.136.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.138.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.140.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.142.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.144.0/20	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.144.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.144.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.146.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.148.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.150.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.152.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.152.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.156.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.156.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.157.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.160.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.160.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.162.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.164.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.166.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.168.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.168.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.170.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.172.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.172.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.173.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.174.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.176.0/20	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.176.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.176.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.177.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.178.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.179.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.180.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.181.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.183.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.184.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.185.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.186.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.187.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.188.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.188.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.189.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.190.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.191.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 02:24	Announcing
51.39.128.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.39.129.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.39.130.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.39.131.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped

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.