AS43061 SI-STELKOM - Stelkom d.o.o.

AS overview

Test target: 2a02:d90:2000:e001::1d · in-prefix path hop · address space: PA · prefixes announced: 1

prefix(es): 2a02:d90::/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
`2a02:d90:2000:e001::1d`	rtr	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓
`2a02:d90::1`	prb	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	-

SIX peering

SIX member - open peering, peering member, since 2012-02-01. IPv6 LAN: 2001:7f8:46:0:1:0:4:3061. Locations: lj_ijs, lj_tpl.

rs1-lan1-ipv6 → 2001:7f8:46:0:1:0:4:3061 Established (loc: lj_tpl, since 2026-09-10)
rs1-lan1-ipv6 → 2001:7f8:46::4:3061 Established (loc: lj_ijs, since 2026-09-17)
rs2-lan1-ipv6 → 2001:7f8:46:0:1:0:4:3061 Established (loc: lj_tpl, since 2026-08-24)
rs2-lan1-ipv6 → 2001:7f8:46::4:3061 Established (loc: lj_ijs, since 2026-08-24)

Announces via SIX route servers: 7 prefix(es) - 2001:678:29c::/48, 2001:67c:16c4::/48, 2001:67c:2324::/48, 2001:67c:2430::/46, 2a02:2590::/32, 2a02:7a8::/32, 2a02:d90::/32

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a02:d90::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS43061 /32 maxLen 32 (ripe)

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

At least one router inside AS43061's announced prefix replied during the random-target probe. Hop(s): 2a02:d90:2000:e001::1d, 2a02:d90:7000:e000::2. These are candidate targets for direct testing.

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 2026-09-23T10:35:28Z

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

4/4

Echo small (56B) 33.2ms

4/4

Echo 1500B (DF) 32.2ms

Type 1 dest-unreach

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	2001:7f8:1e::4	0.5ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:30:0:2:1:4:3061	18.5ms	0%	-	NA
4	2a02:d90:2000:e001::1d	31.3ms	0%	AS43061	SI-STELKOM - Stelkom d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.010ms pmtu 1500
 1:  _gateway                                              0.479ms 
 1:  _gateway                                              0.587ms 
 2:  2001:7f8:1e::4                                        0.679ms 
 3:  2001:7f8:30:0:2:1:4:3061                             18.761ms 
 4:  no reply
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Berlin) openRFC 4890 ✓

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

4/4

Echo small (56B) 33.1ms

4/4

Echo 1500B (DF) 33.5ms

Type 1 dest-unreach

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	0.2ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.7ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-10.cr10.ber03.lwlcom.net 2a00:c380:b200:230::220	0.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-15.cr11.dtm01.lwlcom.net 2a00:c380:b200:230::5	8.5ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-20.cr10.dtm01.lwlcom.net 2a00:c380:b200:230::92	8.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-50.cr10.dus02.lwlcom.net 2a00:c380:b200:230::24	8.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-20.cr10.dus01.lwlcom.net 2a00:c380:b200:230::108	8.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	ae6-60.cr10.ams01.lwlcom.net 2a00:c380:b200:230::213	11.3ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
9	2001:7f8:12a::110	17.4ms	0%	-	NA
10	ip6-2a02-2720-100b-1c--1.euroweb.ro 2a02:2720:100b:1c::1	27.1ms	0%	AS6663	TTI-NET - Euroweb Romania S.R.L., RO
11	ip6-2a02-2720-100b-1c--2.euroweb.ro 2a02:2720:100b:1c::2	28.3ms	0%	AS6663	TTI-NET - Euroweb Romania S.R.L., RO
12	2a02:d90:2000:e001::1d	33.2ms	0%	AS43061	SI-STELKOM - Stelkom d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  1.975ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  1.174ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.449ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.657ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.976ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          9.439ms asymm  4 
 6:  ae0-20.cr10.dus04.lwlcom.net                          9.441ms asymm  5 
 7:  ae0-10.cr10.dus01.lwlcom.net                          9.172ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         12.455ms asymm  5 
 9:  2001:7f8:12a::110                                    17.868ms asymm  7 
10:  ip6-2a02-2720-100b-1c--1.euroweb.ro                  27.904ms asymm  9 
11:  ip6-2a02-2720-100b-1c--2.euroweb.ro                  28.805ms asymm  5 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Düsseldorf) openRFC 4890 ✓

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

4/4

Echo small (56B) 30.9ms

4/4

Echo 1500B (DF) 30.9ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1	3.8ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1	0.6ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
4	lag11.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:115::3	0.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag0-vl1011.core1-fra-ix.bb.wiit.network 2001:4ba0:ffe9:8a::2	4.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	lag0-vl1001.core1-nbg-ncd.bb.wiit.network 2001:4ba0:ffe9:103e::1	7.0ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
7	lag0-vl6.core2-nbg-ncd.bb.wiit.network 2001:4ba0:ffe9:103b::1	6.9ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
8	2001:4ba0:ffe9:b8	9.5ms	0%	-
9	lag0-vl1009.core1-muc-eq3.bb.wiit.network 2001:4ba0:ffe9:a7::1	9.7ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
10	lag0-vl1001.core1-pda-vsix.bb.wiit.network 2001:4ba0:ffe9:da::2	20.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
11	lag0-vl1001.core1-mil-mix.bb.wiit.network 2001:4ba0:ffe9:db::2	20.1ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
12	2a02:d90:2000:e001::1d	30.8ms	0%	AS43061	SI-STELKOM - Stelkom d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.010ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.439ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.295ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.173ms 
 3:  no reply
 4:  lag11.core3-dus1.bb.wiit.network                      0.492ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.597ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.030ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.120ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.656ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network             9.894ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.545ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.545ms asymm  9 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From NL host (go6lab) openRFC 4890 ✓

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

4/4

Echo small (56B) 146.2ms

4/4

Echo 1500B (DF) 49.7ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	1.9ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	-	-
3	2a00:1ca8:1::194	3.5ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	2.2ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2a03:5f80:7::230:185	39.8ms	0%	-	NA
6	ip6-2a02-2720-100b-1c--1.euroweb.ro 2a02:2720:100b:1c::1	52.6ms	0%	AS6663	TTI-NET - Euroweb Romania S.R.L., RO
7	ip6-2a02-2720-100b-1c--2.euroweb.ro 2a02:2720:100b:1c::2	49.3ms	0%	AS6663	TTI-NET - Euroweb Romania S.R.L., RO
8	2a02:d90:2000:e001::1d	47.6ms	0%	AS43061	SI-STELKOM - Stelkom d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.173ms pmtu 1500
 1:  ???                                                   4.768ms 
 1:  ???                                                   3.466ms 
 2:  gw.friends.steffann.nl                                3.427ms 
 3:  2a00:1ca8:1::194                                      3.901ms 
 4:  2a03:3f40::10:41                                      3.520ms 
 5:  2a03:5f80:7::230:185                                 41.889ms 
 6:  ip6-2a02-2720-100b-1c--1.euroweb.ro                  42.073ms asymm  4 
 7:  ip6-2a02-2720-100b-1c--2.euroweb.ro                  49.299ms asymm  5 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) openRFC 4890 ✓

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

4/4

Echo small (56B) 19.2ms

4/4

Echo 1500B (DF) 20.9ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	*	-	-	-
3	2a12:d8c0:101f:103::1	8.4ms	70%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	2a02:d90:2000:e001::1d	19.3ms	0%	AS43061	SI-STELKOM - Stelkom 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 1500
 1:  karsolink-01.net.karsolink.com                        1.256ms 
 1:  karsolink-01.net.karsolink.com                        0.959ms 
 2:  2a12:d8c0:109f:121::a1                                0.970ms 
 3:  2a12:d8c0:101f:103::1                                 9.359ms 
 4:  no reply
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) openRFC 4890 ✓

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

4/4

Echo small (56B) 1.4ms

4/4

Echo 1500B (DF) 1.6ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	*	-	30%	-
4	2001:7f8:46::4:3061 @SIX	1.0ms	0%	AS51988	ARNES-SIX - ARNES, SI
5	2a02:d90:2000:e001::1d	1.5ms	0%	AS43061	SI-STELKOM - Stelkom 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]                        0.020ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.507ms 
 1:  fw1-lju.6connect.com                                  0.669ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.789ms 
 4:  2a03:a100:0:201:1::1                                  0.730ms pmtu 1500
 4:  2001:7f8:46::4:3061                                   1.342ms 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2) openRFC 4890 ✓

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

4/4

Echo small (56B) 2.5ms

4/4

Echo 1500B (DF) 3.9ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a01:260:1::225	1.9ms	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	2.3ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2a02:d90:2000:e001::1d	3.2ms	0%	AS43061	SI-STELKOM - Stelkom d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.578ms 
 1:  2a01:261:313:b814::1                                  1.166ms 
 2:  2a01:260:1::225                                       2.611ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.380ms 
 4:  2001:7f8:46::4:3061                                   8.856ms asymm  5 
 5:  no reply
 6:  no reply
 7:  no reply
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500