51.36.128.0/18

Currently announced by AS43766 Zain KSA, in the routed prefix 51.36.128.0/18.

Current ASN: AS43766; Zain KSA
Routed prefix: 51.36.128.0/18; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: RIPENCC; Saudi Arabia · 51.36.0.0/16

Routing data · Nov 2, 2026, 00:27 UTC

ASN historyEvery routed prefix covering 51.36.128.0/18

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.36.128.0/18	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.0.0/16	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped

More specific routes63 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
51.36.128.0/19	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.128.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.128.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.130.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.132.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.134.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.136.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.136.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.138.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.140.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.142.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.144.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.144.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.146.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.148.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.150.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.150.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.151.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.152.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.152.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.154.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.156.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.160.0/19	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.160.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.160.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.164.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.166.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.168.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.170.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.170.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.171.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.172.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.172.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.173.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.174.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.174.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.175.0/24	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.176.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.176.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.178.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.180.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.184.0/21	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.184.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.186.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.188.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.190.0/23	AS43766	Zain KSA	Saudi Arabia	Before monitoring	2026-11-02 00:27	Announcing
51.36.128.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.129.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.130.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.131.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.140.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.141.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.148.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.149.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.158.0/23	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.160.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.161.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.162.0/23	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.180.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.181.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.182.0/23	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.182.0/24	AS43766	Zain KSA	Saudi Arabia	2026-10-25 10:20	2026-11-01 16:26	Stopped
51.36.183.0/24	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: 51.36.0.0/16
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.