AS203618 UB330-NET2 - UB330.net d.o.o.

AS overview

Test target: 2a03:8d60:0:e780::184 · ns1.ub330.net · address space: PA · prefixes announced: 1

prefix(es): 2a03:8d60::/48

Targets & per-vantage-point probe results (5 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
`2a03:8d60:0:14b5::1`	hit	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓
`2a03:8d60:0:e780::1`	hit	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓
`2a03:8d60:0:e780::184` ns1.ub330.net	NS	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	?	?	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓
`2a03:8d60:0:e780:c24a:ff:fecc:9c0a`	atl	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-
`2a03:8d60::1`	hit	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓	✓	✓	?	?	✓

SIX peering

Not an SIX member, but our traceroute path crosses the SIX LAN from SLO host (6connect) - 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)
`2a03:8d60::/48`	✓ valid	matched VRP (correct origin, length within maxLength)	AS203618 /48 maxLen 48 (ripe)

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

We probed 35 arbitrary IPv6 address(es) inside AS203618's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a01:260:4057::16 at hop 24 - that router answers ICMPv6 Echo. This is not in AS203618'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 2026-09-23T10:35:31Z

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) 18.9ms

4/4

Echo 1500B (DF) 19.0ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.3ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.2ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.3ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	12.7ms	0%	-
5	2001:7f8:30:0:2:1:3:4779	17.4ms	0%	-	NA
6	2a01-260-1-1--d.core6.t-2.net 2a01:260:1:1::d	17.7ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
7	2a01-260-1-1--93.core6.t-2.net 2a01:260:1:1::93	17.5ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
8	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	18.7ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
9	ns1.ub330.net 2a03:8d60:0:e780::184	18.9ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.013ms pmtu 1500
 1:  _gateway                                              0.328ms 
 1:  _gateway                                              0.444ms 
 2:  sox-pn.sox.rs                                         0.415ms 
 3:  2001:7f8:1e:8::3d                                     0.543ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.882ms asymm  3 
 5:  2001:7f8:30:0:2:1:3:4779                             17.527ms asymm  8 
 6:  2a01-260-1-1--d.core6.t-2.net                        17.534ms asymm  7 
 7:  2a01-260-1-1--93.core6.t-2.net                       17.798ms asymm  9 
 8:  2a01-260-4057--16.link6.t-2.net                      18.904ms asymm  9 
 9:  ns1.ub330.net                                        18.487ms reached
     Resume: pmtu 1500 hops 9 back 11

From DE host (Berlin) openRFC 4890 ✓

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

4/4

Echo small (56B) 33.6ms

4/4

Echo 1500B (DF) 33.8ms

yes

Type 1 dest-unreach

443,80

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	0.8ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae3-90.cr10.ham01.lwlcom.net 2a00:c380:b200:230::192	4.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-50.cr11.ham01.lwlcom.net 2a00:c380:b200:230::45	4.8ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	2a00:c380:f000::4b	5.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae4-2087.dus10.core-backbone.com 2a01:4a0:0:2087::33	11.2ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
7	ae21-2071.fra10.core-backbone.com 2a01:4a0:0:2071::4	10.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
8	ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4	10.5ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
9	ae6-2003.nbg20.core-backbone.com 2a01:4a0:0:2003::2	12.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
10	ae2-2032.muc20.core-backbone.com 2a01:4a0:0:2032::7	14.6ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
11	ae1-2028.vie10.core-backbone.com 2a01:4a0:0:2028::10	20.3ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
12	2a01:4a0:1338:115::2	32.0ms	0%	AS201011	CORE-BACKBONE - Core-Backbone GmbH, DE
13	2a01-260-1-1--d.core6.t-2.net 2a01:260:1:1::d	32.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
14	2a01-260-1-1--93.core6.t-2.net 2a01:260:1:1::93	32.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
15	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	33.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
16	ns1.ub330.net 2a03:8d60:0:e780::184	33.5ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.701ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.665ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.964ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.199ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.273ms 
 5:  2a00:c380:f000::4b                                    5.678ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.853ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    10.948ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     10.889ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.354ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     14.925ms asymm  7 
11:  ae1-2028.vie10.core-backbone.com                     20.525ms asymm  8 
12:  2a01:4a0:1338:115::2                                 32.579ms 
13:  2a01-260-1-1--d.core6.t-2.net                        32.381ms asymm 11 
14:  2a01-260-1-1--93.core6.t-2.net                       32.202ms asymm 12 
15:  2a01-260-4057--16.link6.t-2.net                      32.414ms asymm 14 
16:  ns1.ub330.net                                        33.322ms reached
     Resume: pmtu 1500 hops 16 back 14

From DE host (Düsseldorf) openRFC 4890 ✓

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

4/4

Echo small (56B) 29.0ms

4/4

Echo 1500B (DF) 29.7ms

yes

Type 1 dest-unreach

443,80

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	5.5ms	0%	-	NA
3	*	-	-	-
4	be6.core2.ams2.he.net 2001:470:0:61c::2	9.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	t-2.interxionfra11.nlsix.net 2001:7f8:13::a503:4779:1	34.9ms	0%	-	NA
6	2a01-260-1-1--95.core6.t-2.net 2a01:260:1:1::95	34.1ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
7	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	29.7ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
8	ns1.ub330.net 2a03:8d60:0:e780::184	34.2ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.362ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.362ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               6.416ms asymm  3 
 3:  no reply
 4:  be6.core2.ams2.he.net                                 9.622ms asymm  6 
 5:  t-2.interxionfra11.nlsix.net                         28.976ms asymm 11 
 6:  2a01-260-1-1--95.core6.t-2.net                       33.389ms asymm 12 
 7:  2a01-260-4057--16.link6.t-2.net                      31.470ms asymm 12 
 8:  ns1.ub330.net                                        35.165ms reached
     Resume: pmtu 1500 hops 8 back 14

From NL host (go6lab) openRFC 4890 ✓

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

4/4

Echo small (56B) 153.2ms

4/4

Echo 1500B (DF) 42.6ms

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	1.8ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	2a00:1ca8:1::194	3.3ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:33	6.7ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	t-2.interxionfra11.nlsix.net 2001:7f8:13::a503:4779:1	37.9ms	0%	-	NA
6	2a01-260-1-1--95.core6.t-2.net 2a01:260:1:1::95	41.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
7	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	38.1ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
8	ns1.ub330.net 2a03:8d60:0:e780::184	40.6ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  2a00:8642:42::2                                       2.415ms 
 1:  2a00:8642:42::2                                       1.944ms 
 2:  gw.friends.steffann.nl                                2.922ms 
 3:  2a00:1ca8:1::194                                      3.617ms 
 4:  2a03:3f40::10:33                                      6.493ms 
 5:  t-2.interxionfra11.nlsix.net                         43.808ms asymm  6 
 6:  2a01-260-1-1--95.core6.t-2.net                       44.757ms asymm  7 
 7:  2a01-260-4057--16.link6.t-2.net                      33.809ms asymm  9 
 8:  ns1.ub330.net                                        45.418ms reached
     Resume: pmtu 1500 hops 8 back 9

From ITA host (Karsolink) openRFC 4890 ✓

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

4/4

Echo small (56B) 45.4ms

4/4

Echo 1500B (DF) 45.8ms

yes

Type 1 dest-unreach

443,80

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	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	*	-	0%*	-
3	2a12:d8c0:101f:103::1	8.5ms	10%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	100ge0-0-0-20.core1.vie1.he.net 2001:470:0:414::1	22.4ms	70%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:7f8:30:0:2:1:3:4779	19.4ms	0%	-	NA
7	2a01-260-1-1--d.core6.t-2.net 2a01:260:1:1::d	44.5ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
8	2a01-260-1-1--93.core6.t-2.net 2a01:260:1:1::93	37.5ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
9	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	44.1ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
10	ns1.ub330.net 2a03:8d60:0:e780::184	45.7ms	0%	AS203618	UB330-net2 - UB330.net 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]                        0.036ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.875ms 
 1:  karsolink-01.net.karsolink.com                        0.650ms 
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  10.302ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      22.742ms 
 6:  2001:7f8:30:0:2:1:3:4779                             20.535ms 
 7:  2a01-260-1-1--d.core6.t-2.net                        45.133ms asymm 11 
 8:  2a01-260-1-1--93.core6.t-2.net                       36.956ms asymm 11 
 9:  2a01-260-4057--16.link6.t-2.net                      44.817ms asymm 13 
10:  ns1.ub330.net                                        46.276ms reached
     Resume: pmtu 1500 hops 10 back 14

From SLO host (6connect) openRFC 4890 ✓

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

4/4

Echo small (56B) 1.9ms

4/4

Echo 1500B (DF) 1.9ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.4ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	2a03:a100:0:201:1::1	1.1ms	0%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	six.t-2.si @SIX 2001:7f8:46::3:4779	1.2ms	0%	AS34779	T-2
5	2a01-260-1-1--93.core6.t-2.net 2a01:260:1:1::93	1.5ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
6	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	2.1ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
7	ns1.ub330.net 2a03:8d60:0:e780::184	2.3ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.834ms 
 1:  fw1-lju.6connect.com                                  0.616ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.235ms 
 4:  2a03:a100:0:201:1::1                                  1.058ms pmtu 1500
 4:  six.t-2.si                                            1.542ms 
 5:  2a01-260-1-1--93.core6.t-2.net                        1.978ms asymm  6 
 6:  2a01-260-4057--16.link6.t-2.net                       3.061ms asymm  7 
 7:  ns1.ub330.net                                         1.923ms reached
     Resume: pmtu 1500 hops 7 back 8

From SLO host (T-2) openRFC 4890 ✓

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

4/4

Echo small (56B) 4.2ms

4/4

Echo 1500B (DF) 4.3ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a01:260:1::225	2.4ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	2.2ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	2a01-260-1-1--93.core6.t-2.net 2a01:260:1:1::93	2.6ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
5	2a01-260-4057--16.link6.t-2.net 2a01:260:4057::16	2.7ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
6	ns1.ub330.net 2a03:8d60:0:e780::184	3.2ms	0%	AS203618	UB330-net2 - UB330.net d.o.o., SI

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.989ms 
 2:  2a01:260:1::225                                       4.400ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        3.604ms 
 4:  2a01-260-1-1--95.core6.t-2.net                        3.763ms 
 5:  2a01-260-4057--16.link6.t-2.net                       3.401ms 
 6:  ???                                                   4.746ms reached
     Resume: pmtu 1500 hops 6 back 6