AS52035 D1 - D1, informacijske tehnologije, d.o.o.

AS overview

Test target: 2a0e:ce40:ffff::2 · via IPv6 Hitlist (responsive) · address space: mixed · prefixes announced: 1

prefix(es): 2a0e:ce40::/32

Targets & per-vantage-point probe results (2 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 / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a0e:ce40::1`	prb	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓
`2a0e:ce40:ffff::2`	hit	✓	✗	?	refused	✓	✓	✗	?	refused	✓	✓	✗	?	refused	✓	✓	✗	?	?	✓	✓	✗	?	refused	✓	✓	✗	?	refused	✓	✓	✗	?	refused	✓

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 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0e:ce40::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS52035 /29 maxLen 32 (ripe); AS209411 /29 maxLen 32 (ripe)

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

We probed 35 arbitrary IPv6 address(es) inside AS52035's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:28b0:101:866::1 at hop 12 - that router answers ICMPv6 Echo. This is not in AS52035'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 2026-09-23T10:36:18Z

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: 1420

4/4

Echo small (56B) 27.2ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.4ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	21.5ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2001:67c:128c::699	17.6ms	0%	-	NA
5	2a0e:ce40:ffff::2	28.9ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 1500
 1:  _gateway                                              0.578ms 
 1:  _gateway                                              0.485ms 
 2:  sox-pn.sox.rs                                         0.841ms 
 3:  2001:7f8:1e:8::3d                                     0.706ms asymm  2 
 4:  2001:67c:128c::699                                   18.301ms 
 5:  2a02:28b0:101:859::2                                 22.492ms pmtu 1420
 5:  2a0e:ce40:ffff::2                                    29.037ms reached
     Resume: pmtu 1420 hops 5 back 10

From DE host (Berlin) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 43.6ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.9ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-10.cr10.ber03.lwlcom.net 2a00:c380:b200:230::220	5.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-15.cr11.dtm01.lwlcom.net 2a00:c380:b200:230::5	8.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-20.cr10.dtm01.lwlcom.net 2a00:c380:b200:230::92	8.3ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-50.cr10.dus02.lwlcom.net 2a00:c380:b200:230::24	8.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-40.cr10.dus05.lwlcom.net 2a00:c380:b200:230::199	8.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	ae0-10.cr10.ams02.lwlcom.net 2a00:c380:b200:230::101	11.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
9	2001:7f8:13::a500:3212:1	29.2ms	0%	-	NA
10	2a00:fc0:4314:c::a	35.1ms	20%	AS3212	TELEMACH - Telemach Slovenija d.o.o., SI
11	2a00:fc0:4314:c::b	33.4ms	0%	AS3212	TELEMACH - Telemach Slovenija d.o.o., SI
12	2a02:28b0:101:866::1	32.5ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
13	2a02:28b0:101:859::2	33.7ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
14	2a0e:ce40:ffff::2	40.1ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

Rate-limited ICMPv6: hop 10 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.780ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.732ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.350ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.240ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          9.033ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          9.198ms asymm  4 
 6:  ae0-50.cr10.dus02.lwlcom.net                          9.024ms asymm  3 
 7:  ae0-40.cr10.dus05.lwlcom.net                          8.970ms asymm  4 
 8:  ae0-10.cr10.ams02.lwlcom.net                         12.097ms asymm  5 
 9:  2001:7f8:13::a500:3212:1                             31.377ms asymm  8 
10:  2a00:fc0:4314:c::a                                   37.229ms asymm  8 
11:  2a00:fc0:4314:c::b                                   35.087ms asymm  9 
12:  2a02:28b0:101:866::1                                 42.954ms asymm  8 
13:  2a02:28b0:101:859::2                                 32.280ms asymm  9 
14:  2a02:28b0:101:859::2                                 32.522ms pmtu 1420
14:  2a0e:ce40:ffff::2                                    37.793ms reached
     Resume: pmtu 1420 hops 14 back 10

From DE host (Düsseldorf) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 26.7ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ipv6.decix-dusseldorf.core1.dus1.he.net 2001:7f8:9e::1b1b:0:1	6.3ms	0%	-	NA
3	100ge0-0-0-18.core4.fra1.he.net 2001:470:0:52e::1	7.6ms	40%	AS6939	HURRICANE - Hurricane Electric LLC, US
4	be8.core1.prg1.he.net 2001:470:e:1e::2	14.8ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	be3.core1.vie1.he.net 2001:470:e:a7::2	18.3ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	e0-36.core1.lju1.he.net 2001:470:0:578::2	20.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2001:470:435:1::2	19.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	2a02:28b0:101:800::1	77.1ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
9	2a02:28b0:101:825::1	31.9ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
10	2a02:28b0:101:859::2	20.1ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
11	2a0e:ce40:ffff::2	24.3ms	-	AS52035	D1 - D1, informacijske tehnologije, 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]                        0.037ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.664ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.590ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               5.839ms asymm  3 
 3:  no reply
 4:  be8.core1.prg1.he.net                                12.287ms asymm  5 
 5:  be3.core1.vie1.he.net                                16.885ms asymm  4 
 6:  e0-36.core1.lju1.he.net                              20.769ms asymm  5 
 7:  six2.siel.si                                         21.204ms asymm 15 
 8:  2a02:28b0:101:866::1                                 78.675ms asymm  7 
 9:  2a02:28b0:101:859::2                                 20.214ms asymm  8 
10:  2a02:28b0:101:859::2                                 20.398ms asymm  8 
11:  2a02:28b0:101:859::2                                 20.160ms pmtu 1420
11:  2a0e:ce40:ffff::2                                    27.888ms reached
     Resume: pmtu 1420 hops 11 back 9

From NL host (go6lab) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 35.7ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	1.0ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	2a00:1ca8:1::194	2.5ms	10%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:33	6.6ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2001:7f8:13::a500:3212:1	29.5ms	0%	-	NA
6	*	-	0%	-
7	2a00:fc0:4314:c::b	32.8ms	0%	AS3212	TELEMACH - Telemach Slovenija d.o.o., SI
8	2a02:28b0:101:866::1	44.5ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
9	2a02:28b0:101:859::2	31.5ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
10	2a0e:ce40:ffff::2	34.9ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1420
 1:  2a00:8642:42::2                                       2.240ms 
 1:  2a00:8642:42::2                                       4.626ms 
 2:  gw.friends.steffann.nl                                2.051ms 
 3:  2a00:1ca8:1::194                                      7.731ms 
 4:  2a03:3f40::10:33                                      7.461ms 
 5:  2001:7f8:13::a500:3212:1                             25.222ms asymm  8 
 6:  2a00:fc0:4314:c::a                                   31.179ms asymm  8 
 7:  2a00:fc0:4314:c::b                                   31.823ms asymm  9 
 8:  2a02:28b0:101:866::1                                100.729ms asymm  9 
 9:  2a02:28b0:101:859::2                                 29.152ms asymm 10 
10:  2a0e:ce40:ffff::2                                    32.495ms reached
     Resume: pmtu 1420 hops 10 back 11

From ITA host (Karsolink) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 27.2ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	*	-	-	-
3	2a12:d8c0:101f:6::1	9.8ms	80%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	e0-35.core1.zag2.he.net 2001:470:0:6ea::2	18.8ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	*	-	-	-
7	e0-35.core1.lju1.he.net 2001:470:0:577::2	21.9ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	2001:470:435:1::2	20.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	2a02:28b0:101:800::1	20.2ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
10	2a02:28b0:101:859::2	21.1ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
11	2a0e:ce40:ffff::2	26.8ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.690ms 
 2:  2a12:d8c0:109f:121::a1                                0.564ms 
 3:  2a12:d8c0:101f:103::1                                 8.771ms 
 4:  no reply
 5:  e0-35.core1.zag2.he.net                              18.493ms 
 6:  no reply
 7:  e0-35.core1.lju1.he.net                              21.624ms 
 8:  six2.siel.si                                         20.710ms 
 9:  2a02:28b0:101:866::1                                 25.948ms 
10:  2a02:28b0:101:825::1                                 26.122ms asymm  9 
11:  2a02:28b0:101:859::2                                 20.033ms pmtu 1420
11:  2a02:28b0:101:859::2                                 21.761ms asymm 10 
12:  2a0e:ce40:ffff::2                                    28.544ms reached
     Resume: pmtu 1420 hops 12 back 11

From SLO host (6connect) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 6.7ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.1ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	2a03:a100:0:201:1::1	0.6ms	80%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	2001:7f8:46::5:1790 @SIX	1.6ms	0%	AS51988	ARNES-SIX - ARNES, SI
5	2a02:28b0:101:1699::1	1.6ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
6	2a02:28b0:101:866::1	3.0ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
7	2a02:28b0:101:859::2	1.8ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
8	2a0e:ce40:ffff::2	8.1ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

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

tracepath -6

 1?: [LOCALHOST]                        0.017ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.523ms 
 1:  fw1-lju.6connect.com                                  0.486ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                203.037ms 
 4:  2a03:a100:0:201:1::1                                  3.797ms pmtu 1500
 4:  2001:7f8:46::5:1790                                   3.175ms asymm  6 
 5:  2a02:28b0:101:1699::1                                 2.011ms asymm  6 
 6:  2a02:28b0:101:866::1                                  3.192ms asymm  7 
 7:  2a02:28b0:101:859::2                                  4.309ms asymm  8 
 8:  2a02:28b0:101:859::2                                  1.486ms pmtu 1420
 8:  2a0e:ce40:ffff::2                                     8.582ms reached
     Resume: pmtu 1420 hops 8 back 9

From SLO host (T-2) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1420

4/4

Echo small (56B) 8.0ms

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

443

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a01:261:313:b814::1	0.6ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
2	2a01:260:1::225	2.9ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9a.core6.t-2.net 2a01:260:1:1::9a	2.4ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2001:7f8:46::5:1790 @SIX	2.1ms	0%	AS51988	ARNES-SIX - ARNES, SI
5	2a02:28b0:101:1699::1	2.1ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
6	2a02:28b0:101:866::1	17.2ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
7	2a02:28b0:101:859::2	3.5ms	0%	AS51790	SIEL - SIEL, d.o.o., SI
8	2a0e:ce40:ffff::2	10.7ms	0%	AS52035	D1 - D1, informacijske tehnologije, d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.035ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       6.819ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.911ms 
 4:  2001:7f8:46::5:1790                                   3.211ms asymm  5 
 5:  2a02:28b0:101:800::1                                  7.142ms 
 6:  2a02:28b0:101:866::1                                 14.258ms 
 7:  2a02:28b0:101:859::2                                  3.652ms 
 8:  2a02:28b0:101:859::2                                  3.419ms pmtu 1420
 8:  2a0e:ce40:ffff::2                                     9.320ms reached
     Resume: pmtu 1420 hops 8 back 8