Spoofing Information for AS 199524 (GCORE)

Spoofing status per IP block

Spoof status key
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither spoofed nor unspoofed packet was received.
IP blockLatest testSpoof
5.101.218.x/242020-09-24 18:46:35 GMTblockedblocked
5.188.37.x/242020-09-24 19:17:08 GMTblockedblocked
5.188.92.x/242021-02-21 15:08:11 GMTunknownunknown
5.188.93.x/242020-08-21 17:02:49 GMTunknownunknown
5.188.108.x/242020-08-21 16:52:09 GMTblockedblocked
5.188.238.x/242020-09-24 19:17:49 GMTblockedblocked
92.38.135.x/242020-08-18 06:13:29 GMTblockedblocked
92.38.163.x/242020-10-23 02:30:03 GMTblockedblocked
92.38.174.x/242022-07-04 21:47:03 GMTunknownunknown
92.223.72.x/242019-07-12 08:30:26 GMTblockedblocked
92.223.73.x/242020-10-20 14:45:45 GMTunknownunknown
92.223.79.x/242020-08-21 17:33:42 GMTunknownunknown
92.223.85.x/242021-09-30 07:26:16 GMTblockedblocked
92.223.87.x/242021-07-27 09:16:52 GMTblockedblocked
92.223.89.x/242021-04-02 13:49:40 GMTrewrittenreceived
92.223.93.x/242020-08-21 17:32:15 GMTblockedblocked
92.223.103.x/242022-09-22 11:51:46 GMTblockedblocked
92.223.105.x/242020-10-09 05:26:14 GMTblockedblocked
141.101.148.x/242020-10-08 17:05:50 GMTblockedreceived
146.185.219.x/242020-09-24 19:17:28 GMTblockedblocked
172.111.181.x/242020-10-08 17:00:44 GMTblockedreceived
2a03:90c0:xx::/402021-04-02 13:49:40 GMTunknownunknown

Customers of AS 199524 we have spoofer tests from

This is the list of directly connected customers of AS 199524 from which we have received a spoofer test, ordered by the customer's ability to send spoofed packets and the number of prefixes of an inferred ingress ACL derived from prefix announcements for the customer recorded in public BGP data. BCP-84 describes ingress ACLs as "the most bulletproof solution when done properly" and the "best fit ... when the configuration is not too dynamic, ... if the number of used prefixes is low." Further detail about the size and dynamism of an inferred ACL is available by following the History link for each AS.

ASNCountryNumber of Prefixes
in Customer Cone
Number of ASes
in Customer Cone
266454bra (Brazil)31AS 266454 testsreceived
263067bra (Brazil)73AS 263067 testsreceived
53185bra (Brazil)93AS 53185 testsreceived
53181bra (Brazil)218102AS 53181 testsblocked
53181bra (Brazil)218102AS 53181 testsblocked

Address Space Announcement History

The customer cone for 199524 is too large for a prefix list to be useful.

Last Modified