Spoofing Information for AS 21859 (ZEN-ECN)

Spoofing status per IP block (all dates)

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
23.90.128.x/242023-06-08 03:20:57 GMTblockedblocked
23.248.169.x/242023-11-19 08:32:50 GMTblockedblocked
36.255.96.x/242020-10-08 16:08:59 GMTblockedblocked
36.255.97.x/242020-10-08 17:17:40 GMTreceivedreceived
37.230.173.x/242020-10-08 17:16:51 GMTreceivedreceived
98.96.193.x/242024-02-23 17:03:01 GMTunknownrewritten
98.98.247.x/242024-04-21 07:06:05 GMTblockedblocked
104.250.162.x/242020-10-08 17:17:10 GMTreceivedreceived
128.1.225.x/242020-10-08 17:24:48 GMTrewrittenreceived
128.14.140.x/242020-06-09 06:21:20 GMTblockedreceived
128.14.180.x/242020-06-18 01:52:20 GMTblockedreceived
129.227.110.x/242020-10-08 16:18:49 GMTblockedblocked
172.247.38.x/242020-10-09 08:34:38 GMTblockedblocked
2607:a400:xx::/402020-09-11 04:06:39 GMTblockedblocked
2a0b:21c0:30xx::/402023-06-01 02:14:09 GMTblockedblocked

Customers of AS 21859 we have spoofer tests from

This is the list of directly connected customers of AS 21859 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 the latest month of 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
152179usa (United States)370AS 152179 testsblocked
25820 (IT7NET)usa (United States)990AS 25820 testsblocked
14593 (SPACEX-STARLINK)bra (Brazil)1731AS 14593 testsblocked

Address Space Announcement History

The customer cone for 21859 is too large for a prefix list to be useful.

Last Modified