AS8596 - HOTZE-AS hotze.comPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a02:5d8:192::1 · adns1.hotze.com · address space: PA · prefixes announced: 1

prefix(es): 2a02:5d8::/32

VIX / AAIX / SAIX / TIROL-IX / ERA-IX peering

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

We probed 35 arbitrary IPv6 address(es) inside AS8596's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:30:0:2:1:0:8596 at hop 24 - that router answers ICMPv6 Echo. This is not in AS8596'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 2026-09-22T13:53:40Z

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 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              0.934ms 
 1:  _gateway                                              0.662ms 
 2:  sox-pn.sox.rs                                         0.569ms 
 3:  2001:7f8:1e:8::3d                                     0.647ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       11.632ms asymm  3 
 5:  r1-iec-ge03-vix.vie.hotze.com                        24.309ms asymm  3 
 6:  2a02:5d8:1:1::231                                    24.402ms asymm  4 
 7:  adns1.hotze.com                                      26.216ms reached
     Resume: pmtu 1500 hops 7 back 5 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.774ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.794ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.111ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         12.150ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         12.047ms 
 5:  r1-iec-ge03-vix.vie.hotze.com                        30.412ms 
 6:  2a02:5d8:1:1::231                                    30.524ms 
 7:  adns1.hotze.com                                      30.600ms reached
     Resume: pmtu 1500 hops 7 back 7 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.298ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.419ms 
 2:  ae0-101.cr10.dus02.lwlcom.net                         0.574ms 
 3:  ae0-40.cr10.dus05.lwlcom.net                          0.428ms 
 4:  ae0-90.cr11.dus01.lwlcom.net                          0.883ms 
 5:  ae0-30.cr10.dus06.lwlcom.net                          1.054ms 
 6:  ae0-40.cr10.fra06.lwlcom.net                          4.599ms 
 7:  ae0-20.cr10.muc01.lwlcom.net                         15.170ms asymm  5 
 8:  r1-iec-ge03-vix.vie.hotze.com                        33.069ms asymm  6 
 9:  2a02:5d8:1:1::231                                    33.921ms asymm  7 
10:  adns1.hotze.com                                      33.966ms reached
     Resume: pmtu 1500 hops 10 back 8 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.050ms pmtu 1500
 1:  2a00:8642:42::2                                       3.319ms 
 1:  2a00:8642:42::2                                       2.878ms 
 2:  gw.friends.steffann.nl                              121.348ms 
 3:  2a00:1ca8:1::194                                      2.421ms 
 4:  2a03:3f40::10:41                                      3.335ms 
 5:  2001:b28:3ff::1b1b:0:1                               29.035ms 
 6:  be9.core4.fra1.he.net                                31.274ms asymm  4 
 7:  no reply
 8:  de-cix.r60.inx.fra.de.nextlayer.net                  42.041ms 
 9:  ams-ix.r06.nikh.ams.nl.nextlayer.net                 44.108ms asymm  8 
10:  ip6-ae30-0-r01.ebg.ibk.nextlayer.net                 54.336ms asymm 12 
11:  2a02:5d8:1:1::231                                    46.809ms asymm  8 
12:  2a02:5d8:1:1::231                                    50.076ms asymm  8 
13:  adns1.hotze.com                                      50.986ms reached
     Resume: pmtu 1500 hops 13 back 9 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 11 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.586ms 
 3:  no reply
 4:  no reply
 5:  be47.core1.mil2.he.net                               12.580ms 
 6:  be1.core1.zrh2.he.net                                14.107ms 
 7:  no reply
 8:  be1.core3.zrh3.he.net                                15.512ms 
 9:  no reply
10:  ip6-ae30-0-r01.ebg.ibk.nextlayer.net                 30.063ms asymm 11 
11:  2a01:190:1701::1b2                                   25.858ms asymm  7 
12:  2a02:5d8:1:1::231                                    25.716ms asymm  7 
13:  adns1.hotze.com                                      25.739ms reached
     Resume: pmtu 1500 hops 13 back 8 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.643ms 
 1:  fw1-lju.6connect.com                                  0.784ms 
 2:  no reply
 3:  2a00:ee1:800:9::1                                     2.632ms 
 4:  2a00:ee0:1:10::2                                      1.369ms asymm  3 
 5:  2a00:ee0:1:15::2                                     64.259ms pmtu 1500
 5:  2a11:4142:2002::                                      1.111ms asymm  6 
 6:  r2-vie1-at.as5405.net                                 7.410ms asymm  9 
 7:  et9-4096.r2-vie2-at.as5405.net                        7.280ms asymm  8 
 8:  r1-iec-ge03-vix.vie.hotze.com                        20.870ms asymm  4 
 9:  2a02:5d8:1:1::231                                    21.120ms asymm  6 
10:  adns1.hotze.com                                      21.320ms reached
     Resume: pmtu 1500 hops 10 back 6 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       2.659ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.129ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.858ms asymm  3 
 5:  100ge0-0-0-31.core1.vie1.he.net                      12.094ms 
 6:  vix-ip6-et-0-1-2-0-r60.esh.vie.at.nextlayer.net      10.427ms asymm  5 
 7:  vix-ip6-et-0-1-2-0-r60.inx.vie.at.nextlayer.net       9.806ms asymm  5 
 8:  2a01:190:1701::1b2                                   23.224ms asymm  6 
 9:  2a02:5d8:1:1::231                                    22.276ms asymm  6 
10:  2a02:5d8:1:1::231                                    22.823ms asymm  6 
11:  adns1.hotze.com                                      22.850ms reached
     Resume: pmtu 1500 hops 11 back 7