AS204096 - ASN-MAC Manutenzione ed Assistenza Computers S.r.lRFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a06:7280::2 · static prefix probe · address space: unknown · prefixes announced: 1

prefix(es): 2a06:7280::/29

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

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

We probed 35 arbitrary IPv6 address(es) inside AS204096's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a01:a620:1::6 at hop 16 - that router answers ICMPv6 Echo. This is not in AS204096'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 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:04:59Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

• ● SRB host (SOX, Belgrade)
• ● DE host (Berlin)
• ● DE host (Düsseldorf)
• ● NL host (go6lab)
• ● ITA host (Karsolink)
• ● SLO host (6connect)
• ● SLO host (T-2)
• ── solid line = echo reply, PTB honored (clean reach)
• — — dashed line = echo reply but PTB not honored (RFC 4890 violation)
• no line = no echo reply (never reached)
• ◉ target: green = clean, amber = reachable-but-violation / unreachable
• ⚠ suspected drop AS
• ⋯ silent (unanswered) hops
• ● IXP hop

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.013ms pmtu 1500
 1:  _gateway                                              0.485ms 
 1:  _gateway                                              0.444ms 
 2:  2001:7f8:1e::108                                      0.580ms 
 3:  2001:b28:3ff::de4f:0:1                               33.205ms asymm  7 
 4:  2a01:a620:1:1::                                      55.844ms asymm  6 
 5:  2a06:7280::2                                         55.242ms reached
     Resume: pmtu 1500 hops 5 back 7 

From DE host (Berlin)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.547ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.469ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.990ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          0.834ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.817ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          8.688ms asymm  4 
 6:  ae0-20.cr10.dus04.lwlcom.net                          8.874ms asymm  5 
 7:  ae0-20.cr10.dus01.lwlcom.net                          8.768ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         13.009ms asymm  5 
 9:  2001:7f8:12a::199                                    19.891ms asymm  5 
10:  2a01:a620:1:1::                                      48.031ms asymm 11 
11:  2a06:7280::2                                         37.174ms reached
     Resume: pmtu 1500 hops 11 back 12 

From DE host (Düsseldorf)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.411ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.246ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.217ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.434ms 
 5:  lag0-vl1010.core1-ams-ni.bb.wiit.network              4.153ms 
 6:  2001:7f8:134::24                                      7.275ms asymm  4 
 7:  2a01:a620:1:1::                                      28.589ms asymm 10 
 8:  2a06:7280::2                                         29.272ms reached
     Resume: pmtu 1500 hops 8 back 11 

From NL host (go6lab)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.046ms pmtu 1500
 1:  2a00:8642:42::2                                       3.577ms 
 1:  2a00:8642:42::2                                       3.838ms 
 2:  gw.friends.steffann.nl                                5.739ms 
 3:  speed-ix.tnxe.net                                     7.275ms 
 4:  2a01:a620:1:1::                                      30.886ms 
 5:  2a06:7280::2                                         33.213ms reached
     Resume: pmtu 1500 hops 5 back 5 

From ITA host (Karsolink)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        1.085ms 
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  11.056ms 
 4:  warian.minap.it                                      11.790ms 
 5:  2a01:a620:1:1::                                      22.734ms 
 6:  2a06:7280::2                                         23.756ms reached
     Resume: pmtu 1500 hops 6 back 6 

From SLO host (6connect)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.445ms 
 1:  fw1-lju.6connect.com                                  0.561ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.126ms 
 4:  2a00:ee0:1:15::2                                      1.465ms asymm  3 
 5:  2a00:ee0:1:15::2                                      1.695ms pmtu 1500
 5:  2001:41a8:20:2::169                                  10.826ms asymm  6 
 6:  rom2-loop0-v6.rom.seabone.net                        17.062ms asymm  7 
 7:  no reply
 8:  2a06:7280::2                                         24.193ms reached
     Resume: pmtu 1500 hops 8 back 9 

From SLO host (T-2)   openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.182ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.726ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        3.236ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  38.705ms asymm  4 
 6:  be6.core3.par2.he.net                                42.250ms 
 7:  seabone-net-as6762.port-channel7.core2.par2.he.net   40.301ms asymm  8 
 8:  seabone-net-as6762.port-channel7.core2.par2.he.net   39.548ms 
 9:  no reply
10:  2a06:7280::2                                         53.125ms reached
     Resume: pmtu 1500 hops 10 back 8