AS203528 FabrizzioPetrucci-AS Fabrizzio Jose Petrucci

IPv6 prefix announced, but nothing inside is responding yet. AS203528 announces 1 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.

AS overview

Test target: 2a0e:8f02:21d0::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a0e:8f02:21d0::/44

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0e:8f02:21d0::/44`	✓ valid	matched VRP (correct origin, length within maxLength)	AS203528 /44 maxLen 48 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 15 arbitrary IPv6 address(es) inside AS203528's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a0c:b640:11:162::1 at hop 22 - that router answers ICMPv6 Echo. This is not in AS203528's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:36:55Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a0e:8f02:21d0::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:55Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0e:8f02:21d0::1`	`icmp6-echo`	no_echo	2026-05-25T12:48:02Z
odin	`2607:fae0:a000::42`	`2a0e:8f02:21d0::1`	`icmp6-echo`	no_echo	2026-05-25T12:36:26Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: timed out
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (karsolink):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 101] Network is unreachable
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (odin):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: timed out
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.

From NL host (go6lab) transit only unreachable

filter likely at: past AS34872 (Servperso_Systems) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::3	0.8ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	speed-ix.servperso.net 2001:7f8:b7::a520:5523:1	2.7ms	0%	-	NA
4	2a0c-b640-ffff-194-28-98-32-135.edge.isp.servpersosystems.net 2a0c:b640:ffff:194:28:98:32:135	2.5ms	0%	AS34872	Servperso_Systems - Sarah Rossius trading as Servperso Systems, BE
5	*	-	-	-
6	*	-	-	-
7	*	-	-	-
8	*	-	-	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-
23	*	-	-	-
24	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.033ms pmtu 1500
 1:  2a00:8642:42::3                                       2.331ms 
 1:  2a00:8642:42::3                                       1.627ms 
 2:  gw.friends.steffann.nl                                2.392ms 
 3:  speed-ix.servperso.net                                2.572ms 
 4:  2a0c-b640-ffff-194-28-98-32-135.edge.isp.servpersosystems.net   2.939ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: past AS34872 (Servperso_Systems) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	*	-	-	-
3	2a12:d8c0:101f:6::1	10.0ms	30%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	myloc.minap.it 2001:7f8:c5::a502:4961:1	10.2ms	0%	AS24961	myLoc managed IT AG
5	2001:4ba0:ffe9:c6	14.1ms	0%	-
6	lag0-vl1017.core1-fra-eq5.bb.wiit.network 2001:4ba0:ffe9:b7::1	19.0ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
7	lag5.core2-dus-ix.bb.wiit.network 2001:4ba0:ffe9:d6::3	22.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
8	lag4.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:6a::1	22.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
9	lag7.core2-dus3.bb.wiit.network 2001:4ba0:ffe9:42::2	22.6ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
10	lag2-h3679.edge3-dus3.bb.wiit.network 2001:4ba0:ffe9:7a::2	24.7ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
11	2001:4ba0:dead:b051::3	23.0ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
12	2a0c-b640-ffff-100-120-7-128-132.edge.isp.servpersosystems.net 2a0c:b640:ffff:100:120:7:128:132	23.3ms	0%	AS34872	Servperso_Systems - Sarah Rossius trading as Servperso Systems, BE
13	eth0.AMS1BR1.compumundohipermegared.one 2a0c:b640:11:162::1	23.6ms	0%	AS34872	Servperso_Systems - Sarah Rossius trading as Servperso Systems, BE

Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.606ms 
 1:  karsolink-01.net.karsolink.com                        0.864ms 
 2:  2a12:d8c0:109f:121::a1                                0.860ms 
 3:  2a12:d8c0:101f:6::1                                  10.770ms 
 4:  myloc.minap.it                                       10.789ms 
 5:  lag0-vl1002.core1-lpg-green-lu2.bb.wiit.network      14.911ms 
 6:  lag0-vl1017.core1-fra-eq5.bb.wiit.network            19.359ms 
 7:  lag0-vl7.core1-fra-ix.bb.wiit.network                19.633ms 
 8:  lag26.core3-dus1.bb.wiit.network                     23.399ms 
 9:  lag6.core2-dus3.bb.wiit.network                      23.026ms 
10:  lag2-h3679.edge3-dus3.bb.wiit.network                26.576ms 
11:  2001:4ba0:dead:b051::3                               23.584ms asymm  9 
12:  2a0c-b640-ffff-100-120-7-128-132.edge.isp.servpersosystems.net  24.084ms asymm 10 
13:  eth0.ams1br1.compumundohipermegared.one              23.820ms !N
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: no path · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	0%*	-
3	2a03:a100:0:201:1::1	0.5ms	0%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	e0-1.core1.lju1.he.net 2001:470:1:5be::1	2.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	*	-	-	-
6	port-channel1.core1.zag2.he.net 2001:470:0:2ea::2	4.0ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	*	-	-	-
9	*	-	-	-
10	fd00:2001:470:2366::2	18.4ms	0%	-	NA
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-
19	*	-	-	-
20	*	-	-	-
21	*	-	-	-
22	*	-	-	-
23	*	-	-	-
24	*	-	-	-

Rate-limited ICMPv6: hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.081ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.613ms 
 1:  fw1-lju.6connect.com                                  0.535ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.887ms 
 4:  e0-1.core1.lju1.he.net                                1.901ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.102ms 
 7:  no reply
 8:  no reply
 9:  no reply
10:  fd00:2001:470:2366::2                                19.227ms 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500