AS41828 - Telemach SlovenijaPI/PARFC 4890 ✓RPKI ⚠ 1/2ASPA ✓

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AS overview

Test target: 2a02:840:101:126::2:1 · via IPv6 Hitlist (responsive) · address space: mixed · prefixes announced: 2

prefix(es): 2a02:840::/32, 2a01:b4a0:1000::/48

Targets & per-vantage-point probe results (9 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a02:840:101:126::2:1hitrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused
2a02:840:101:126::2:2hitrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused
2a02:840:1:1000::162hitopenopenopenopenopenopenopenopenopenopenopenopenopenopen
2a02:840:1:1000::165hitopenopenopenopenopenopenopenopenopenopenopenopenopenopen
2a02:840:1:1000::170hitrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused-
2a02:840:1:1000::2hitrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused-
2a02:840:1:1000::203hitopenrefusedopenrefusedopenrefusedopen?openrefusedopenrefusedopenrefused-
2a02:840:1:1000::205hitopenopenopenopenopenopenopenopenopenopenopenopenopenopen
2a02:840::1prbrefusedrefusedrefusedrefusedrefusedrefused??refusedrefusedrefusedrefusedrefusedrefused-

SIX peering

Not an SIX member, but our traceroute path crosses the SIX LAN from SLO host (6connect), SLO host (T-2) - reached via an SIX-resident transit operator.

RPKI & ASPA

1 of 2 prefix(es) covered by a valid ROA, 1 not-found.

PrefixRPKI stateReasonCovering VRP(s)
2a02:840::/32✓ validmatched VRP (correct origin, length within maxLength)AS3212 /32 maxLen 32 (ripe); AS41828 /32 maxLen 32 (ripe)
2a01:b4a0:1000::/48- not-foundno covering VRP

ASPA: this AS has published an ASPA record listing 1 upstream provider(s) that are authorized to propagate routes from it: AS3212. Routes from this AS that arrive via any other upstream are considered ASPA-invalid by validators that enforce ASPA.

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

We probed 70 arbitrary IPv6 address(es) inside AS41828's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a00:fc0:10:301::2 at hop 20 - that router answers ICMPv6 Echo. This is not in AS41828's announced prefix; operationally it's the AS-edge / peering interface (often on a SIX 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 2026-09-23T10:35:10Z

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 ↗

multi-vantage path diagram for AS41828

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

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

4/4
Echo small (56B) 20.4ms
4/4
Echo 1500B (DF) 22.5ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.2ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
22001:7f8:1e::1212.1ms80%AS13004SOX - Serbian Open Exchange DOO, RS
32a03:dd80:1:1::11.6ms-AS21215UGNI - UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd, RS
4*-90%-
52a00:fc0:3212:3::a15.5ms0%AS3212TELEMACH - Telemach Slovenija d.o.o., SI
62a02:840:101:126::2:120.4ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

Rate-limited ICMPv6: hop 2, hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  _gateway                                              0.513ms 
 1:  _gateway                                              0.484ms 
 2:  2001:7f8:1e::121                                      1.436ms 
 3:  2a03:dd80:1:1::1                                      1.422ms asymm  2 
 4:  2a03:dd80:2:e::1                                     14.331ms 
 5:  2a00:fc0:3212:3::a                                   14.859ms asymm  6 
 6:  2a02:840:101:126::2:1                                18.623ms reached
     Resume: pmtu 1500 hops 6 back 5 

From DE host (Berlin)   openRFC 4890 ✓

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

4/4
Echo small (56B) 27.5ms
4/4
Echo 1500B (DF) 40.5ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02
0.5ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-40.cr10.muc02.lwlcom.net
2a00:c380:b200:230::178
11.5ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-10.cr10.muc01.lwlcom.net
2a00:c380:b200:230::177
11.6ms0%AS50629LWLCOM - LWLcom GmbH, DE
5*-10%-
62a02:840:101:126::2:136.9ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.833ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.817ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.298ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         11.806ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         11.835ms 
 5:  2001:7f8:30:0:2:1:0:3212                             21.826ms asymm  7 
 6:  2a02:840:101:126::2:1                                30.790ms reached
     Resume: pmtu 1500 hops 6 back 9 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

4/4
Echo small (56B) 26.1ms
4/4
Echo 1500B (DF) 35.5ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-101.cr10.dus02.lwlcom.net
2a06:d1c0::dead:beef:1301
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-40.cr10.dus05.lwlcom.net
2a00:c380:b200:230::199
0.3ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-10.cr10.ams02.lwlcom.net
2a00:c380:b200:230::101
3.4ms0%AS50629LWLCOM - LWLcom GmbH, DE
52001:7f8:13::a500:3212:123.2ms0%-NA
62a02:840:101:126::2:157.0ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.428ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.826ms 
 2:  ae0-101.cr10.dus02.lwlcom.net                         0.565ms 
 3:  ae0-40.cr10.dus05.lwlcom.net                          0.685ms 
 4:  ae0-10.cr10.ams02.lwlcom.net                          3.497ms 
 5:  2001:7f8:13::a500:3212:1                             22.920ms asymm  7 
 6:  2a02:840:101:126::2:1                                28.719ms reached
     Resume: pmtu 1500 hops 6 back 8 

From NL host (go6lab)   openRFC 4890 ✓

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

4/4
Echo small (56B) 141.5ms
4/4
Echo 1500B (DF) 40.4ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::22.5ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2*-0%*-
32a00:1ca8:1::1943.6ms0%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:335.4ms0%AS50673Serverius-as - Serverius Holding B.V., NL
52001:7f8:13::a500:3212:123.7ms0%-NA
62a02:840:101:126::2:128.7ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.047ms pmtu 1500
 1:  ???                                                   6.300ms 
 1:  ???                                                   3.372ms 
 2:  gw.friends.steffann.nl                                9.146ms 
 3:  2a00:1ca8:1::194                                    305.254ms 
 4:  2a03:3f40::10:33                                      6.431ms 
 5:  2001:7f8:13::a500:3212:1                             25.626ms asymm  8 
 6:  2a02:840:101:126::2:1                                30.257ms reached
     Resume: pmtu 1500 hops 6 back 9 

From ITA host (Karsolink)   openRFC 4890 ✓

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

4/4
Echo small (56B) 45.6ms
4/4
Echo 1500B (DF) 45.9ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
2*-0%*-
3*-90%-
4*---
5100ge0-0-0-20.core1.vie1.he.net
2001:470:0:414::1
21.8ms20%AS6939HURRICANE - Hurricane Electric LLC, US
6telemach-d-o-o.e0-77.core2.vie1.he.net
2001:470:1:bcc::2
21.1ms0%AS6939HURRICANE - Hurricane Electric LLC, US
72a02:840:101:126::2:129.5ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.841ms 
 3:  2a12:d8c0:101f:6::1                                  10.173ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      21.934ms 
 6:  telemach-d-o-o.e0-66.core2.vie1.he.net               22.755ms asymm  7 
 7:  2a02:840:101:126::2:1                               122.681ms reached
     Resume: pmtu 1500 hops 7 back 8 

From SLO host (6connect)   openRFC 4890 ✓

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

4/4
Echo small (56B) 32.3ms
4/4
Echo 1500B (DF) 29.4ms
yes
Type 1 dest-unreach
443,80
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*-40%-
42001:7f8:46::2:1215 @SIX9.5ms0%AS51988ARNES-SIX - ARNES, SI
52a03:dd80:1:1::110.7ms10%AS21215UGNI - UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd, RS
62a03:dd80:2:e::19.7ms40%AS21215UGNI - UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd, RS
72a00:fc0:3212:1::a9.7ms0%AS3212TELEMACH - Telemach Slovenija d.o.o., SI
82a00:fc0:3212:200::a9.9ms0%AS3212TELEMACH - Telemach Slovenija d.o.o., SI
92a02:840:101:126::2:119.6ms0%AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.021ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.471ms 
 1:  fw1-lju.6connect.com                                  0.429ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.058ms 
 4:  2a03:a100:0:201:1::1                                  0.902ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.491ms 
 5:  no reply
 6:  telemach-d-o-o.e0-77.core2.vie1.he.net                8.341ms asymm  5 
 7:  2a02:840:101:126::2:1                                23.269ms reached
     Resume: pmtu 1500 hops 7 back 6 

From SLO host (T-2)   openRFC 4890 ✓

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

4/4
Echo small (56B) 16.5ms
4/4
Echo 1500B (DF) 14.7ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
22a01:260:1::22512.4ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9c.core6.t-2.net
2a01:260:1:1::9c
11.1ms0%*AS34779T-2-AS - T-2, d.o.o., SI
42001:7f8:46::2:1215 @SIX20.4ms70%AS51988ARNES-SIX - ARNES, SI
5*-70%-
6*-70%-
72a00:fc0:3212:1::a20.3ms0%AS3212TELEMACH - Telemach Slovenija d.o.o., SI
8*-0%-
92a02:840:101:126::2:115.5ms-AS41828TELEMACH-HOSTING - Telemach Slovenija d.o.o., SI

Rate-limited ICMPv6: hop 4, hop 5, 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:  2a01:261:313:b814::1                                  1.031ms 
 2:  2a01:260:1::225                                       3.239ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.567ms 
 4:  2001:7f8:46::2:1215                                  12.462ms 
 5:  2a03:dd80:1:1::1                                     12.970ms asymm  4 
 6:  no reply
 7:  2a00:fc0:3212:3::a                                   11.178ms 
 8:  2a00:fc0:3212:200::a                                 12.174ms asymm  7 
 9:  2a02:840:101:126::2:1                                38.237ms reached
     Resume: pmtu 1500 hops 9 back 6