AS207606 - Myweb Myweb srlsRPKI -ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS207606 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: 2a04:1a80::1 · (no live host found) · address space: unknown · prefixes announced: 1

prefix(es): 2a04:1a80::/29

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2020-02-13. IPv6 LAN: 2001:7f8:b:100:1d1:a520:7606:30. Locations: -.

RPKI & ASPA

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

PrefixRPKI stateReasonCovering VRP(s)
2a04:1a80::/29- not-foundno covering VRP

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

We probed 15 arbitrary IPv6 address(es) inside AS207606's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:b:100:1d1:a520:7606:30 at hop 24 - that router does not answer ICMPv6 Echo. This is not in AS207606'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 2026-05-25T12:32:43Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a04:1a80::1icmp6-echono_echo2026-05-25T12:32:43Z
karsolink2a12:d8c0:105a:9001::a1542a04:1a80::1icmp6-echono_echo2026-05-25T12:41:00Z
odin2607:fae0:a000::422a04:1a80::1icmp6-echono_echo2026-05-25T12:32:25Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: timed out
  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: timed out
  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 AS174 (COGENT-174) · 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::31.3ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		2.2ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1942.3ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:412.4ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5*-30%-
6*---
7*---
8*---
9*---
102001:978:2:40::3:16.1ms-AS174COGENT-174 - Cogent Communications, LLC, US

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

tracepath -6

 1?: [LOCALHOST]                        0.041ms pmtu 1500
 1:  2a00:8642:42::3                                       1.491ms 
 1:  2a00:8642:42::3                                       1.313ms 
 2:  gw.friends.steffann.nl                                1.848ms 
 3:  2a00:1ca8:1::194                                      2.878ms 
 4:  2a03:3f40::10:41                                      2.622ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  2001:978:2:40::3:1                                    6.481ms !N
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS62275 (NHM) · 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
1karsolink-01.net.karsolink.com
2a12:d8c0:105a:9001::1		0.2ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
22a12:d8c0:109f:121::a10.4ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
32a12:d8c0:109f:106::a23.1ms0%AS204471KARSOLINK - 2S Computers SRL, IT
42a12:d8c0:1a1::b23.4ms0%AS204471KARSOLINK - 2S Computers SRL, IT
52a0a:f980:0:103::18.5ms0%AS50877AIRBEAM-AS - Airbeam S.r.l., IT
62a04:8640:cafe:babe:185:40:214:229.8ms0%AS62275NHM - NHM - S.R.L., IT
7*---
8*---
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---
21*---
22*---
23*---
24*---

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:109f:106::a2                                3.753ms 
 4:  2a12:d8c0:1a1::b2                                     4.052ms 
 5:  2a0a:f980:0:104::1                                    9.362ms 
 6:  2a04:8640:cafe:babe:185:40:214:22                    11.782ms asymm  4 
 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 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) -
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2		0.4ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::10.7ms20%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1		2.1ms40%AS6939HURRICANE - Hurricane Electric LLC, US
5*---
6port-channel1.core1.zag2.he.net
2001:470:0:2ea::2		4.0ms30%AS6939HURRICANE - Hurricane Electric LLC, US
7*---
8myweb-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO
2001:7f8:b:100:1d1:a520:7606:30		12.1ms0%-NA
9myweb-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO
2001:7f8:b:100:1d1:a520:7606:30		12.4ms0%-NA

Rate-limited ICMPv6: hop 3, hop 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.485ms 
 1:  fw1-lju.6connect.com                                  0.457ms 
 2:  no reply
 3:  no reply
 4:  e0-1.core1.lju1.he.net                                2.251ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       3.864ms 
 7:  no reply
 8:  myweb-v6.mix-it.net                                  12.678ms 
 9:  myweb-v6.mix-it.net                                  12.359ms !A
     Resume: pmtu 1500