AS205925 - ASN-GRUPPOAPI Italiana Petroli SpAPARPKI ✓ 1/1ASPA -

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IPv6 prefix announced, but nothing inside is responding yet. AS205925 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: 2a0a:7c40::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a0a:7c40::/32

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

Not an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member, but our traceroute path crosses the MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO LAN from ITA host (Karsolink), SLO host (6connect) - reached via an MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO-resident transit operator.

RPKI & ASPA

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

PrefixRPKI stateReasonCovering VRP(s)
2a0a:7c40::/32✓ validmatched VRP (correct origin, length within maxLength)AS205925 /32 maxLen 32 (ripe)

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

We probed 15 arbitrary IPv6 address(es) inside AS205925's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:b111:affc:2::6 at hop 20 - that router answers ICMPv6 Echo. This is not in AS205925'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 2026-05-25T12:35:21Z

Failure detail — what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
go6lab2a00:8642:42::752a0a:7c40::1icmp6-echono_echo2026-05-25T12:35:21Z
karsolink2a12:d8c0:105a:9001::a1542a0a:7c40::1icmp6-echono_echo2026-05-25T12:46:02Z
odin2607:fae0:a000::422a0a:7c40::1icmp6-echono_echo2026-05-25T12:34:55Z

Attempt log (go6lab):

  1. icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
  2. dns-tcp → no_tcp: connect failed: [Errno 113] No route to host
  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 113] No route to host
  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 113] No route to host
  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 AS1267 (ASN-WINDTRE) · 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::30.9ms0%AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1		1.6ms0%*AS203993STEFFANN-DC-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1941.7ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:335.8ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5ae22-404.ams10.core-backbone.com
2a01:4a0:1338:155::1		5.5ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
62001:7f8:1::a500:1267:130.3ms0%-NA
72a02:b000:fff::e0827.0ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
82a02:b000:fff::4bc30.2ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
92a02:b000:fff::2e735.8ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
102a02:b000:fff::aad37.3ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
112a02:b000:f11:a101::1330.1ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
122a02:b111:affc:2::135.3ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
132a02:b111:affc:2::635.8ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
142a02:b111:affc:2::61129.3ms80%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT

Rate-limited ICMPv6: hop 14 (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                                       1.845ms 
 1:  2a00:8642:42::3                                       1.323ms 
 2:  gw.friends.steffann.nl                                2.049ms 
 3:  2a00:1ca8:1::194                                      3.010ms 
 4:  2a03:3f40::10:33                                      4.593ms 
 5:  ae22-404.ams10.core-backbone.com                      6.055ms 
 6:  2001:7f8:1::a500:1267:1                              30.329ms 
 7:  2a02:b000:fff::e08                                   26.473ms 
 8:  2a02:b000:fff::2d9                                   34.584ms asymm  9 
 9:  2a02:b000:fff::463                                   29.861ms asymm 10 
10:  2a02:b000:fff::ab3                                   31.869ms asymm 11 
11:  2a02:b000:f11:a101::13                               44.591ms asymm 13 
12:  2a02:b111:affc:2::1                                  36.445ms asymm 13 
13:  2a02:b111:affc:2::6                                  39.986ms asymm 14 
14:  2a02:b111:affc:2::6                                 716.780ms !H
     Resume: pmtu 1500

From ITA host (Karsolink)   transit only unreachable

filter likely at: past AS1267 (ASN-WINDTRE) · 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		0.3ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
2*-0%*-
32a12:d8c0:101f:6::19.9ms0%AS204471KARSOLINK - 2S Computers SRL, IT
42a03:b020:1:51::a10.2ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5wind-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:a5d0:1267:9		8.8ms0%-NA
62a02:b000:fff::cb318.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
72a02:b000:fff::2e720.9ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
82a02:b000:fff::aad20.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
92a02:b000:f11:a101::1122.1ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
102a02:b111:affc:2::124.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
112a02:b111:affc:2::624.3ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
12*-80%-
13*---
14*---
15*---
16*---
17*---
182a02:b111:affc:2::61190.7ms-AS1267ASN-WINDTRE - WIND TRE S.P.A., IT

Rate-limited ICMPv6: hop 12 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.778ms 
 3:  2a12:d8c0:101f:6::1                                  10.449ms 
 4:  2a03:b020:1:51::a                                    11.009ms 
 5:  wind-v6.mix-it.net                                    9.195ms asymm  6 
 6:  2a02:b000:fff::e45                                   21.663ms asymm  9 
 7:  2a02:b000:fff::51                                    19.524ms asymm 10 
 8:  2a02:b000:fff::aad                                   22.769ms asymm 11 
 9:  2a02:b000:f11:a101::13                               20.139ms asymm 13 
10:  2a02:b111:affc:2::1                                  26.880ms asymm 13 
11:  2a02:b111:affc:2::6                                  26.892ms asymm 14 
12:  no reply
12:  2a02:b111:affc:2::6                                 3112.527ms !H
     Resume: pmtu 1500

From SLO host (6connect)   transit only unreachable

filter likely at: past AS1267 (ASN-WINDTRE) · 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
1fw1-lju.6connect.com
2607:fae0:a000::2		0.3ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
3*-30%-
4*-40%-
5*---
6port-channel1.core1.zag2.he.net
2001:470:0:2ea::2		4.0ms20%AS6939HURRICANE - Hurricane Electric LLC, US
7*---
8wind-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:a5d0:1267:9		11.7ms0%-NA
92a02:b000:fff::cb342.5ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
102a02:b000:fff::5142.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
112a02:b000:fff::aad45.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
122a02:b000:f11:a101::1345.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
132a02:b111:affc:2::152.0ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
142a02:b111:affc:2::641.6ms0%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT
152a02:b111:affc:2::61132.5ms80%AS1267ASN-WINDTRE - WIND TRE S.P.A., IT

Rate-limited ICMPv6: hop 3, hop 4, hop 6, hop 15 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  fw1-lju.6connect.com                                  0.527ms 
 1:  fw1-lju.6connect.com                                  0.451ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    0.711ms 
 3:  2a03:a100:0:201:1::1                                  0.713ms 
 4:  e0-1.core1.lju1.he.net                                2.357ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       3.944ms 
 7:  no reply
 8:  wind-v6.mix-it.net                                   10.560ms asymm  7 
 9:  2a02:b000:fff::cb3                                   42.315ms asymm 11 
10:  2a02:b000:fff::463                                   49.617ms asymm 11 
11:  2a02:b000:fff::ab4                                   45.402ms asymm 13 
12:  2a02:b000:f11:a101::13                               45.494ms asymm 16 
13:  2a02:b111:affc:2::1                                  49.956ms asymm 15 
14:  2a02:b111:affc:2::6                                  41.776ms asymm 18 
15:  no reply
15:  2a02:b111:affc:2::6                                 3143.053ms !H
     Resume: pmtu 1500