AS203180 - BLUWIFI-AS NEWMEDIAWEB S.R.LPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a0d:540::2 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a0d:540::/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 AS203180's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:470:e:dd::1 at hop 11 - that router answers ICMPv6 Echo. This is not in AS203180'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 2026-09-23T12:07:27Z

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)

Rate-limited ICMPv6: hop 8, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  _gateway                                              0.464ms 
 1:  _gateway                                              0.575ms 
 2:  sox-pn.sox.rs                                         0.507ms 
 3:  2001:7f8:1e:8::3d                                     0.876ms asymm  2 
 4:  2001:67c:128c::699                                   17.518ms 
 5:  hu0-15-0-0.lontr4.London.opentransit.net             41.894ms asymm  6 
 6:  no reply
 7:  be4.core2.ams2.he.net                                41.849ms 
 8:  be7.core2.fra2.he.net                                42.830ms asymm  6 
 9:  be3.core4.fra1.he.net                                41.482ms asymm  7 
10:  be10.core1.zrh2.he.net                               45.816ms asymm  8 
11:  be1.core1.mil2.he.net                                44.437ms asymm  7 
12:  no reply
13:  2a0d:540::2                                          78.201ms reached
     Resume: pmtu 1500 hops 13 back 5 

From DE host (Berlin)   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]                        0.025ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.639ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.645ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.876ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.675ms asymm  7 
 4:  ae0-20.cr10.fra07.lwlcom.net                         10.564ms asymm  6 
 5:  ae0-40.cr10.fra04.lwlcom.net                         10.503ms 
 6:  as6461.frankfurt.megaport.com                         8.198ms 
 7:  2001:438:ffff::407d:1e4b                             17.614ms asymm  8 
 8:  2a00:16f8:11::dba                                    19.619ms asymm 11 
 9:  2a00:16f8:11::dba                                    19.406ms asymm 11 
10:  2a0d:540::2                                          40.857ms reached
     Resume: pmtu 1500 hops 10 back 11 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.316ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.354ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               6.873ms asymm  3 
 3:  100ge0-0-0-18.core4.fra1.he.net                       7.571ms asymm  4 
 4:  be10.core1.zrh2.he.net                               13.325ms asymm  5 
 5:  be1.core1.mil2.he.net                                16.804ms asymm  6 
 6:  no reply
 7:  2a0d:540::2                                          38.083ms reached
     Resume: pmtu 1500 hops 7 back 10 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.169ms pmtu 1500
 1:  2a00:8642:42::2                                       3.186ms 
 1:  2a00:8642:42::2                                       2.425ms 
 2:  gw.friends.steffann.nl                                6.100ms 
 3:  speed-ix.he.net                                       7.284ms 
 4:  be2.core4.fra1.he.net                                15.052ms 
 5:  be10.core1.zrh2.he.net                               18.425ms 
 6:  be1.core1.mil2.he.net                                27.924ms 
 7:  no reply
 8:  2a0d:540::2                                          43.762ms reached
     Resume: pmtu 1500 hops 8 back 8 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.707ms 
 2:  2a12:d8c0:109f:121::a1                                0.820ms 
 3:  no reply
 4:  2a0d:540::2                                          31.487ms reached
     Resume: pmtu 1500 hops 4 back 4 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.671ms 
 1:  fw1-lju.6connect.com                                  0.533ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.030ms 
 4:  2a03:a100:0:201:1::1                                  1.188ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                1.736ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.569ms 
 7:  no reply
 8:  2a0d:540::2                                          37.434ms reached
     Resume: pmtu 1500 hops 8 back 8 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.070ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.024ms 
 1:  no reply
 2:  2a01:260:1::225                                       4.456ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.864ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.818ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                      10.942ms asymm  7 
 6:  no reply
 7:  2a0d:540::2                                          41.370ms reached
     Resume: pmtu 1500 hops 7 back 4