AS16232 - ASN-TIM Telecom ItaliaPARPKI -ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS16232 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: 2a03:8980::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a03:8980::/32

RPKI & ASPA

0 of 1 prefix(es) covered by a valid ROA, 1 not-found.

PrefixRPKI stateReasonCovering VRP(s)
2a03:8980::/32- not-foundno covering VRP

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

We probed 15 arbitrary IPv6 address(es) inside AS16232's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:41a8:20::7 at hop 9 - that router answers ICMPv6 Echo. This is not in AS16232'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 2026-05-25T12:32:15Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a03:8980::1icmp6-echono_echo2026-05-25T12:32:15Z
karsolink2a12:d8c0:105a:9001::a1542a03:8980::1icmp6-echono_echo2026-05-25T12:40:33Z
odin2607:fae0:a000::422a03:8980::1icmp6-echono_echo2026-05-25T12:32:00Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
  3. tls → no_tcp: TLS connect failed
  4. http → no_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
  3. tls → no_tcp: TLS connect failed
  4. 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 AS6762 (SEABONE-NET) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::30.8ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2*-0%*-
32a00:1ca8:1::1942.3ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.7ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*---
6be3458.ccr42.ams03.atlas.cogentco.com
2001:550:0:1000::9a36:27b9		44.1ms-AS174COGENT-174 - Cogent Communications, LLC, US
7*---
82001:978:3::a69.6ms0%AS174COGENT-174 - Cogent Communications, LLC, US
9mil7-loop0-v6.mil.seabone.net
2001:41a8:20::7		19.4ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
10*---
112001:41a8:20:2::27a30.5ms-AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  2a00:8642:42::3                                       1.413ms 
 1:  2a00:8642:42::3                                       1.433ms 
 2:  gw.friends.steffann.nl                                2.452ms 
 3:  2a00:1ca8:1::194                                      2.724ms 
 4:  2a03:3f40::10:41                                      2.490ms 
 5:  no reply
 6:  no reply
 7:  be3500.rcr22.ams05.atlas.cogentco.com                 6.211ms 
 8:  2001:978:3::a6                                       10.738ms asymm  9 
 9:  mil7-loop0-v6.mil.seabone.net                        19.847ms asymm  8 
10:  2001:41a8:20:2::27a                                  30.435ms !A
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS6762 (SEABONE-NET) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
2*---
32a12:d8c0:101f:6::19.9ms80%AS204471KARSOLINK - 2S Computers SRL, IT
42a03:b020:1:51::a10.2ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
52001:41a8:20:2::3510.2ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
6mil51-loop0-v6.mil.seabone.net
2001:41a8:20::33		10.4ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
72001:41a8:20:2::27a12.2ms-AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT

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

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.002ms 
 1:  karsolink-01.net.karsolink.com                        0.945ms 
 2:  2a12:d8c0:109f:121::a1                                0.938ms 
 3:  2a12:d8c0:101f:6::1                                  10.437ms 
 4:  2a03:b020:1:51::a                                    11.126ms 
 5:  2001:41a8:20:2::35                                   10.897ms 
 6:  mil7-loop0-v6.mil.seabone.net                        12.120ms 
 7:  2001:41a8:20:2::412                                  12.711ms !A
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS6762 (SEABONE-NET) · min PMTU on path: 1500

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
3*-10%-
42a00:ee0:1:15::21.0ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
52001:41a8:20:2::1699.2ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
6mil7-loop0-v6.mil.seabone.net
2001:41a8:20::7		8.9ms0%AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT
72001:41a8:20:2::27a10.0ms-AS6762SEABONE-NET - TELECOM ITALIA SPARKLE S.p.A., IT

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

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.724ms 
 1:  fw1-lju.6connect.com                                  0.528ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:10::2                                      1.484ms asymm  3 
 5:  2001:41a8:20:2::169                                   9.259ms asymm  6 
 6:  mil7-loop0-v6.mil.seabone.net                         9.100ms asymm  5 
 7:  2001:41a8:20:2::27a                                  10.147ms !A
     Resume: pmtu 1500